CN101252294B - Power transmission control device, power transmission device, electronic instrument, and non-contact power transmission system - Google Patents

Abstract

A power transmission control device provided in a power transmission device of a non-contact power transmission system includes an amplitude detection circuit that detects amplitude information that relates to an induced voltage signal of a primary coil, an A/D conversion circuit that performs A/D conversion of the amplitude information, and a control circuit. The A/D conversion circuit performs A/D conversion of a detected voltage detected by the amplitude detection circuit at a conversion timing and determines digital data relating to a reference threshold voltage, the conversion timing being a timing after a given period has expired from a timing when the detected voltage has exceeded a provisional voltage. The control circuit performs at least one of data detection that detects data that has been transmitted from a power reception device by means of load modulation, foreign object detection, and detachment detection using the digital data relating to the reference threshold voltage.

Description

Power transmission control device, power transmission device, electronic equipment and non-contact power transmitting system

Technical field

The present invention relates to power transmission control device, power transmission device, electronic equipment and non-contact power transmitting system etc.

Background technology

In recent years, utilize electromagnetic induction, so-called contactless electric power transfer (non-contact electric power transfer) that also can transferring electric power even without the contact of metal section and part also grows up.As the example application of this contactless electric power transfer, the motion of charging of much relating to mobile phone and household electrical appliance (the for example handset of phone) etc. is arranged.

As the prior art of contactless electric power transfer, in patent documentation 1, description is arranged.In this patent documentation 1, realize from the transfer of data of current-collecting device (secondary side) to power transmission device (primary side) with so-called load-modulate mode (load adjustment mode).Then, power transmission device waits the induced voltage that detects primary winding through using comparator (comparator), and judgement is " 0 " or " 1 " from the data of current-collecting device.

But the prior art in this patent documentation 1 through the crest voltage of induced voltage and the threshold voltage of regulation are compared, detects the data of transmission., because the element parameter drift of supply voltage and coil inductance (Coil Inductance) etc., employed threshold voltage also can drift about in the judgement that detects voltage.Therefore, have such technical problem, the load change that promptly correctly detects secondary side is very difficult.

[patent documentation 1] TOHKEMY 2006-60909 communique

Summary of the invention

The present invention also can realize correct power transmission control device, power transmission device, electronic equipment and the non-contact power transmitting system of handling that detect in view of above-mentioned technical problem even can provide under the not first-class situation of element characteristic.

The present invention relates to power transmission control device; Set power transmission control device in the power transmission device in a kind of non-contact power transmitting system; Through letting primary winding and secondary coil electromagnetic induction, from power transmission device to the current-collecting device transferring electric power, and to the load supply capability of said current-collecting device; Said power transmission control device comprises: amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding; The A/D translation circuit is used to carry out the A/D conversion of detected said amplitude information; And control circuit; Be used to control said power transmission device; Said A/D translation circuit with begun to pass through from the moment of utilizing the detected detection voltage of said amplitude detecting circuit to surpass the supposition assigned voltage during given conversion constantly; Detect the A/D conversion of voltage, try to achieve the numerical data of baseline threshold voltage

In the present invention, detect amplitude information, carry out the A/D conversion of detected amplitude information.In this case, carry out the A/D conversion constantly detecting the conversion that moment that voltage surpasses the supposition assigned voltage begun to pass through during preset, try to achieve the numerical data of baseline threshold voltage, detect the load change of secondary side according to the numerical data of being tried to achieve.In view of the above, under the not first-class hereby situation of element, according to this change, the also change of baseline threshold voltage so can handle in correct detection of time limit.In addition, the A/D conversion that is used to try to achieve baseline threshold voltage is carried out detecting the moment that moment that voltage surpasses the supposition assigned voltage begun to pass through during preset.Thereby, can prevent to detect wrong baseline threshold voltage condition, realize stable motion detection.

In addition; In the present invention; Said control circuit is surpassing the moment of supposing assigned voltage from detecting voltage, and usage counter begins counting to be handled; Control circuit is controlled said A/D translation circuit, thereby carries out said A/D conversion constantly according to the said conversion that the count value of said counter is set.

So, because can carry out according to the correct metering of counter number the moment of A/D conversion, so can realize more stable detection action.

In addition, in the present invention, said supposition assigned voltage is that detection voltage and the load of said load-modulate portion of the load of the load-modulate portion that has of said current-collecting device when being non-loaded is the voltage between the detection voltage when load is arranged.

In addition; Said control circuit is according to carrying out Data Detection that add operation or subtraction obtain with parameter voltage with respect to said baseline threshold voltage and detect with threshold voltage with threshold voltage, foreign matter or load and unload detection and use threshold voltage through Data Detection is detected to detect with parameter voltage or loading and unloading with parameter voltage, foreign matter, carries out Data Detection, foreign matter detection and loads and unloads at least a in the detection.

So, can be through the setting of change parameter voltage, Data Detection is used, the foreign matter detection is used or the parameter voltage of loading and unloading detection usefulness thereby individually be provided with, and tries to achieve only threshold voltage.And the automatic correction data of the baseline threshold voltage that can change according to differing based on characteristics such as elements detects and uses, foreign matter detects and uses the perhaps threshold voltage of loading and unloading detection usefulness.

In addition; In the present invention; Said amplitude detecting circuit remains on the maintenance node through the crest voltage with the induced voltage signal of said primary winding, thereby detects the crest voltage as said amplitude information, the control that resets of said control circuit; Begun to pass through resetting constantly between the first phase in the moment that surpasses said supposition assigned voltage from crest voltage; To the discharge electric charge of said maintenance node of low potential side power supply, said A/D translation circuit is tried to achieve the numerical data of said baseline threshold voltage constantly having begun to pass through the conversion of the second phase and carry out the A/D conversion of crest voltage constantly from said resetting.

So, because can be reset and crest voltage carries out the A/D variation after stable, so can improve the numerical data of baseline threshold voltage at the voltage that keeps node.

In addition; In the present invention; Said power transmission device comprises voltage detecting circuit; Said voltage detecting circuit has the node of an end that is arranged on said primary winding and the voltage divider circuit between the low potential side power supply, and cuts apart the induced voltage signal that node is exported said primary winding to the voltage of said voltage divider circuit, and said control circuit carries out switch control; So that when Data Detection and foreign matter detects, when loading and unloading detect, the induced voltage signal of cutting apart node from different voltages with different is imported into said amplitude detecting circuit

So, even also can use identical amplitude detecting circuit to carry out suitable amplitude detection under the situation that the amplitude of the induced voltage signal when Data Detection and foreign matter detect, there is big difference very in the amplitude of the induced voltage signal when loading and unloading detect.

In addition; In the present invention; Said control circuit is detecting when overload through carrying out that the induced voltage signal of cutting apart node from first voltage is input to said amplitude detecting circuit; Carry out and to cut apart the switch control that the induced voltage signal of node is input to said amplitude detecting circuit from cutting apart the second different voltage of node, carry out foreign matter and detect, load and unload and detect with said first voltage.

So, when carrying out to detect the differentiation of overload, can carry out foreign matter and detect.Loading and unloading detect, and can realize effective judgment processing.

In addition in the present invention; Also can comprise pulse width detection circuit; Said pulse width detection circuit is used to detect the pulse width information of the induced voltage signal of said primary winding; Said control circuit carries out Data Detection according to the said pulse width information that is detected by said pulse width detection circuit, uses the numerical data of said baseline threshold voltage to load and unload detection

So, use detection mode through distinguishing, thereby can improve the accuracy of detection and the efficient of load change.

In addition; The invention still further relates to a kind of power transmission control device, be arranged in the power transmission device in the non-contact power transmitting system, said non-contact power transmitting system makes primary winding and secondary coil electromagnetic coupled; From said power transmission device to the current-collecting device transferring electric power; And to the load supply capability of said current-collecting device, comprising: pulse width detection circuit is used to detect the pulse width information of the induced voltage signal of said primary winding; Amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding; And control circuit; Be used to control said power transmission device; Said control circuit basis is by the detected said pulse width information of said pulse width detection circuit; Carry out the detection of the data that said current-collecting device sends through load-modulate, according to loading and unloading detection by the detected said amplitude information of said amplitude detecting circuit.

In the present invention, carry out Data Detection according to the pulse width information that pulse width detection circuit is detected, the amplitude information detected according to amplitude detecting circuit loads and unloads detection.Like this, can be through distinguish using detection mode, detect and carry out through being higher than pulse duration for the sensitivity of Data Detection, thereby improve the accuracy of detection and the efficient of load change such as Data Detection.

In addition, in the present invention, also can comprise: the drive clock generative circuit generates the drive clock of the driving frequency be used to stipulate said primary winding; Driver control circuit generates the driver control signal based on said drive clock, and exports to the electric drive that send that drives said primary winding; Waveform shaping circuit; Induced voltage signal to said primary winding carries out waveform shaping; And the output waveform reshaping signal, said pulse width detection circuit is accepted said waveform shaping signal and said drive clock, detects the pulse width information of said waveform shaping signal.

So; Can individually detect voltage, electric current; Even can not adopt the method for utilizing its phase difference to judge, also can be through voltage waveform be carried out analog waveform shaping simply, thus can handle the load change that stably detect secondary side through digital circuit.Thereby, can detect the load change of secondary side exactly with simple formation.

In addition; In the present invention; Said pulse width detection circuit; During the metrical pulse width, detect pulse width information, during the said pulse duration be from said drive clock by nonactivated voltage level change to first of the voltage level that activates begin to said waveform shaping signal by the voltage level change that activates till second of nonactivated voltage level during.

So, can only measure first, second the point between pulse duration during just detect pulse information, go out the load change of secondary side with simple structure detection.

The power transmission device that the present invention relates in addition comprise above-mentioned any described power transmission control device and send electric portion, the said electric portion generation alternating voltage that send is also supplied with to said primary winding.

The present invention relates to comprise the electronic equipment of the above-mentioned power transmission device of putting down in writing in addition.

In addition; The present invention relates to a kind of non-contact power transmitting system, comprise power transmission device and current-collecting device, through making primary winding and secondary coil electromagnetic coupled; From said power transmission device to said current-collecting device transferring electric power; And to the load supply capability of said current-collecting device, said power transmission device comprises: power receiving section is transformed into direct voltage with the induced voltage of said secondary coil; Load-modulate portion; From said current-collecting device when said power transmission device sends data, according to sending data, load is changed changeably; Said power transmission device comprises: amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding; The A/D translation circuit is used to carry out the A/D conversion of detected said amplitude information; And control circuit; Be used to control said power transmission device; Said A/D translation circuit begun to pass through from the moment of utilizing the detected detection voltage of said amplitude detecting circuit to surpass the supposition assigned voltage during given conversion constantly; Detect the A/D conversion of voltage; Try to achieve the numerical data of baseline threshold voltage, said control circuit uses the numerical data of said baseline threshold voltage, and detection, the foreign matter that carries out the data that said current-collecting device sends through load-modulate detects and at least a in detecting of loading and unloading.

The invention still further relates to a kind of non-contact power transmitting system; Comprise power transmission device and current-collecting device; Through making primary winding and secondary coil electromagnetic coupled, from said power transmission device to said current-collecting device transferring electric power, and to the load supply capability of said current-collecting device; Said current-collecting device comprises: power receiving section is transformed into direct voltage with the induced voltage of said secondary coil; And load-modulate portion; To from said current-collecting device when said power transmission device sends data,, load be changed changeably according to sending data; Said power transmission device comprises: pulse width detection circuit is used to detect the pulse width information of the induced voltage signal of said primary winding; Amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding; And control circuit; Be used to control said power transmission device; Said control circuit basis is by the detected said pulse width information of said pulse width detection circuit; Carry out the detection of the data that said current-collecting device sends through load-modulate, according to loading and unloading detection by the detected said amplitude information of said amplitude detecting circuit.

The present invention relates to a kind of power transmission control device in addition; Be arranged in the power transmission device in the non-contact power transmitting system; Said non-contact power transmitting system makes primary winding and secondary coil electromagnetic coupled, from said power transmission device to the current-collecting device transferring electric power, and to the load supply capability of said current-collecting device; Said power transmission control device comprises: amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding; The A/D translation circuit is used to carry out the A/D conversion of said amplitude information; And control circuit; Be used to control said power transmission device; Said A/D translation circuit is from utilizing after the detected detection voltage of said amplitude detecting circuit surpasses the moment of preset voltage; Carry out the A/D conversion of said detection voltage; Try to achieve that the detection that is used to carry out the data that said current-collecting device sent, foreign matter detect, or the baseline threshold voltage of the detection of the loading and unloading of said power transmission device and said current-collecting device, said control circuit is according to said baseline threshold voltage, carries out the detection of the data that said current-collecting device sent, said foreign matter detects and at least a in detecting of the loading and unloading of said power transmission device and said current-collecting device.

The present invention relates to a kind of power transmission device, comprise above-mentioned power transmission control device and send electric portion, the said electric portion generation alternating voltage that send is also supplied with to said primary winding.

The invention still further relates to the electronic equipment that comprises above-mentioned power transmission device.

The invention still further relates to a kind of non-contact power transmitting system; Comprise power transmission device and current-collecting device; Through making primary winding and secondary coil electromagnetic coupled; To said current-collecting device transferring electric power, to the load supply capability of said current-collecting device, wherein said power transmission device is above-mentioned power transmission device from said power transmission device.

Description of drawings

Fig. 1 (A), Fig. 1 (B) are the key diagrams of contactless electric power transfer.

Fig. 2 be present embodiment power transmission device, power transmission control device, current-collecting device, receive the formation example of controller for electric consumption.

Fig. 3 (A), Fig. 3 (B) are based on the key diagram of the transfer of data of frequency adjustment, load-modulate.

Fig. 4 is to the flow chart that send electric side and the action summary that receives electric side to describe.

Fig. 5 is the formation example of the power transmission control device of present embodiment.

Fig. 6 is the signal waveform example of the action of explanation variation.

Fig. 7 is the example of threshold value table.

Fig. 8 is the concrete formation example of amplitude detecting circuit, A/D translation circuit.

Fig. 9 is the signal waveform example of the action of explanation amplitude detecting circuit.

Figure 10 is the signal waveform example of the action of explanation present embodiment.

Figure 11 is the formation example of first variation of present embodiment.

Figure 12 is the flow chart that is used to explain the work of first variation.

Figure 13 is the formation example of the variation of present embodiment.

Figure 14 (A), Figure 14 (B) are the figure that describes the mensuration result of coil-end voltage waveform.

Figure 15 is an ideograph of describing drive clock and coil-end voltage waveform relation.

Figure 16 is the concrete formation example of second variation.

Figure 17 is the signal waveform example of the action of explanation present embodiment.

Figure 18 (A)～Figure 18 (B) is the performance plot of pulse width variation, amplitude variations.

Figure 19 is the performance plot that concerns between the count value of expression foreign matter size and pulse duration detection.

Embodiment

Below, to a preferred embodiment of the present invention will be described in detail.And, below illustrated present embodiment, be not qualification to the described content of the present invention of claim scope, the formation that present embodiment is illustrated whole for technological means of the present invention, are not to be necessary yet.

1. electronic equipment

Shown in Fig. 1 (A), the example of the electronic equipment of the contactless electric power transfer method of using present embodiment has been described.The charger 500 of one of electronic equipment (expander (Cradle)) has power transmission device 10.In addition, the mobile phone 510 of one of electronic equipment has current-collecting device 40.In addition, mobile phone 510 also has the display part 512 by LCD etc., the operating portion 514 that button etc. constitute, Mike 516 (sound input part), loud speaker 518 (audio output unit), antenna 520.

Charger 500 provides electric power through AC power supplies adapter 502, and this electric power sends to current-collecting device 40 through contactless electric power transfer from power transmission device 10.Based on this, give mobile phone 510 battery charge, or let equipment work in the mobile phone 510.

In addition, used the electronic equipment of present embodiment to be not limited to mobile phone 510.For example, also go for wrist-watch, cordless telephone, the various electronic equipments of shaver, electric toothbrush, tabulation calculator, handheld terminal, portable information terminal or electric bicycle etc.

Shown in Fig. 1 (B); From power transmission device 10 be to the electric power transfer of current-collecting device 40; In power transmission device 10 sides primary winding L1 (sending electric coil) is set; And secondary coil L2 (receiving electric coil) is set in current-collecting device 40 sides, and and letting L1 and L2 electromagnetic coupled, electric power transfer transformer (transformer) realizes thereby form.Based on this, non-contacting electric power transfer becomes possibility.

2. power transmission device, current-collecting device

Fig. 2 described present embodiment power transmission device 10, power transmission control device 20, current-collecting device 40, receive the formation example of controller for electric consumption 50.The electronic equipment that send electric side of charger 500 grades of Fig. 1 (A) comprises the power transmission device 10 of Fig. 2 at least.In addition, the electronic equipment that receives electric side of mobile phone 510 grades comprises current-collecting device 40 and load 90 (this load) at least.And; Formation based on Fig. 2; Can realize so contactless electric power transfer (noncontact electric power transfer) system; Through letting primary winding L1 and secondary coil L2 electromagnetic coupled, from power transmission device 10 to current-collecting device 40 transferring electric powers, and from the voltage output node NB7 of current-collecting device 40 to load 40 supply capabilities (voltage VOUT).

Power transmission device 10 (sending electric module, a module) can comprise primary winding L1, send electric portion 12, voltage detecting road 14, display part 16, power transmission control device 20.In addition, power transmission device 10 and power transmission control device 20 are not limited to the formation of Fig. 2, omit a part of key element (for example display part, voltage detecting circuit) of this formation; Perhaps, increase other and constitute element, perhaps; The various variation of change annexation etc. also are possible.

Send the alternating voltage of electric portion 12 production assigned frequency when electric power transfer, when transfer of data, generate different alternating voltage, and supply with and give primary winding according to data frequency.Concrete shown in Fig. 3 (A), for example, when data " 1 " are sent to the situation of current-collecting device 40, the alternating voltage of generated frequency f1, when sending data " 0 ", the alternating voltage of generated frequency f2.This send electric portion 12 to comprise to drive first the sending electric drive, drive second the sending electric drive and constitute at least one capacitor (condenser) of resonant circuit with primary winding L1 of the other end of primary winding L1 an of end of primary winding L1.

In addition, sending included first, second of electric portion 12 to send electric drive is the negative circuit (buffer circuit) that is made up of high-power mos transistor, and is controlled by the driver control circuit 26 of power transmission control device 20.

Primary winding L1 (sending electric lateral coil) and secondary coil L2 (receiving electric lateral coil) electromagnetic coupled form electric power transfer with transformer (Transformer).For example, when needing electric power transfer, shown in Fig. 1 (A), Fig. 2 (A), above charger 500, place mobile phone 510, the magnetic line of force of primary winding L1 becomes the state through secondary coil.On the other hand, when not needing electric power transfer, physical separation charger 500 and mobile phone 510, the magnetic line of force of primary winding L1 are in the state that does not pass through secondary coil L2.

Voltage detecting circuit 14 is the circuit that detect the induced voltage of primary winding L1, for example comprises resistance R A1, RA2, is arranged on connected node NA3 and diode (Diode) DA1 between the GND (broad sense low voltage side power supply) between RA1 and the RA2.

The function of this voltage detecting circuit 14 is the half-wave shape rectification circuit of the coil-end voltage signal of primary winding L1.And, through input to the amplitude detecting circuit 28 (waveform detection circuit) of power transmission control device 20 with the resulting signal PHIN of coil-end voltage (induced voltage signal, halfwave rectifier signal) of resistance RA1, RA2 dividing potential drop primary winding L1.That is, resistance R A1, RA2 constitute voltage divider circuit (resistance partitioning circuitry) and cut apart node NA3 output from its voltage has signal PHIN.

Display part 16 with the various states of non-contact power transmitting system (in the electric power transfer, ID authentication etc.), uses expressions such as color or image, for example, and by realizations such as LED or LCD.

Power transmission control device 20 is devices that power transmission device 10 is carried out various controls, is waited by IC apparatus (IC) and realizes.This power transmission control device 20 can comprise control circuit 22 (sending electric side), oscillating circuit 24, drive clock generative circuit 25, driver control circuit 26, amplitude detecting circuit 28, A/D translation circuit 29.

Control circuit 22 (control part) is used for power transmission device 10 or power transmission control device 20 are controlled, for example by realizations such as gate array (gate Array) or microcomputers.Specifically, control circuit 22 carries out that electric power transfer, load detecting, frequency translation, foreign matter detect, or needed various SECO and determination processing such as loading and unloading detection.

Oscillating circuit 24 is used to generate the clock of primary side by constituting like the crystal oscillator circuit.Drive clock generative circuit 25 generates the drive clock of regulation driving frequency.And; Equipment control circuit 26 is based on this drive clock with from frequency setting signal of control circuit 22 etc.; Generate the control signal of desired frequency, export to first, second that send electric portion 12 and send electric drive, send electric drive thereby control first, second.

Amplitude detecting circuit 28 detects the amplitude information (crest voltage, amplitude voltage, virtual voltage) of induced voltage signal PHIN of the induced voltage of an end that is equivalent to primary winding L1.Based on this, can carry out data (electric charge) detection, foreign matter (metal) detection, loading and unloading (taking off) detection.

When power transmission device 10 being sent the load-modulate that data use, the signal waveform of the induced voltage of primary winding L1 changes shown in Fig. 3 (B) such as the load-modulate portion 46 of current-collecting device 40.Specifically; When load-modulate portion 46 reduces load in order to send data " 0 "; The amplitude of signal waveform (crest voltage) diminishes, and when load-modulate portion 46 added heavy load in order to send data " 1 ", the amplitude of signal waveform (crest voltage) changed.Therefore, the peak value that amplitude detecting circuit 28 carries out the signal waveform of induced voltage keeps processing etc., whether crosses threshold voltage through judging crest voltage, thereby judges whether the data from current-collecting device 40 are " 1 " perhaps " 0 ".

And the method for amplitude detection is not sunk into the method for Fig. 3 (A) and Fig. 3 (B).For example can use physical quantity (amplitude voltage, virtual voltage) beyond the crest voltage to judge that the load that receives electric side has uprised or step-down.

A/D translation circuit 29; The moment that detection voltage (crest voltage) from amplitude detecting circuit 28 surpasses supposition assigned voltage (supposition threshold voltage) begins; To through till the conversion during the regulation constantly, detect the A/D conversion of voltage, obtain the numerical data of baseline threshold voltage.Then, the numerical data of control circuit 22 usefulness baseline threshold voltages is carried out foreign matter and is detected, loads and unloads at least one in detection and the Data Detection.

Specifically, control circuit 22 begins above supposition assigned voltage (SIGH0) from testing circuit constantly, brings into use the counting of counter 102 to handle, and in the conversion moment that A/D translation circuit 29 is set based on the count value of this counter 102, carries out the A/D conversion.Further, amplitude detecting circuit 28 remains to the maintenance node through the crest voltage with the induced voltage signal (halfwave rectifier signal) of primary winding L1, detects the crest voltage as amplitude information.Then, control circuit 22 is from the moment of crest voltage above assigned voltage, and reset (reseting period) constantly having passed through between the first phase carries out discharging the control that resets that keeps the electric charge in the node to the low potential side power supply.A/D translation circuit 29 begins from resetting to carry out the A/D conversion of crest voltage in the conversion of having passed through the second phase constantly constantly, obtains the numerical data of baseline threshold voltage (SIGHV).

Current-collecting device 40 (receiving electric module, two secondary modules) can comprise secondary coil L2, power receiving section 42, load-modulate portion 46, power supply control part 48, receive controller for electric consumption 50.In addition, current-collecting device 40 with receive controller for electric consumption 50 to be not limited to the formation of Fig. 2, also possibly be a part of key element of omitting its formation, perhaps, increase other and constitute element, perhaps the various distortion of the change relation of continuing.

Power receiving section 42 is transformed into direct voltage with the ac induction voltage of secondary coil L2.This conversion is accomplished by the rectification circuit 43 that power receiving section 42 is had.This rectification circuit 43 comprises diode (Diode) DB1～DB4.Diode DB1 is arranged between the generation node NB3 of node NB1 and direct voltage VDC of an end of secondary coil L2; DB2 is arranged between the node NB2 of the other end of node NB3 and secondary coil; DB3 is arranged between the node NB4 of node NB2 and VSS, and DB4 is arranged between node NB4 and the NB1.

The resistance R B1 of power receiving section 42, RB2 are arranged between node NB1 and the NB4.And, through resistance R B1, RB2 the voltage between node NB1, the NB4 is carried out the signal CCMPI that electric resistance partial pressure obtained, input to the frequency detection circuit 60 that receives controller for electric consumption 50.

The capacitor CB1 of power receiving section 42 and resistance R B4, RB5 are arranged between the node NB4 of node NB3 and VSS of direct voltage VDC.And, through resistance R B4, RB5 the voltage between node NB3, the NB4 is carried out the signal ADIN that dividing potential drop obtained, input to the position detecting circuit 56 that receives controller for electric consumption 50.

Load-modulate portion 46 carries out load-modulate and handles.Specifically; When power transmission device 10 sent specified data, data were corresponding with sending from current-collecting device 40, let the load of load-modulate portion 46 (secondary side) that corresponding the variation taken place; Shown in Fig. 3 (B), let the signal waveform of induced voltage of primary winding L1 change.For this reason, load-modulate portion 46 comprises resistance R B3, the transistor T B3 (the CMOS transistor of N type) that series connection is provided with between node NB3, the NB4.The ON/OFF control of this transistor T B3 is responsible for by the signal P3Q from the control circuit that receives controller for electric consumption 50 52.And when ON/OFF oxide-semiconductor control transistors TB3 carried out load-modulate, transistor T B1, the TB2 of power supply control part 48 were in the OFF state, and load 90 is in the state that electral junction not advances current-collecting device 40.

For example shown in Fig. 3 (B), in order to send data " 0 ", when letting secondary side be in low load (impedance is big), signal P3Q becomes the L level, and transistor T B3 becomes OFF.At this moment, the load of load-modulate portion 46 becomes infinity (non-loaded) basically.On the other hand, in order to send data " 1 " when letting secondary side be in high capacity (impedance is little), signal P3Q becomes the H level, and transistor T B3 becomes ON.At this moment, the load of load-modulate portion 46 becomes resistance R B3.

48 controls of power supply control part are to the supply of the electric power of load 90.Pressurizer (adjuster) 49, the voltage level of the direct voltage VDC that adjustment is obtained by rectification circuit 43 generates supply voltage VD5 (for example 5V).Receive controller for electric consumption 50 for example to carry out work based on high power supply voltage VD5.

Transistor T B2 (P type CMOS transistor) is controlled by the signal P1Q from the control circuit that receives controller for electric consumption 50 52.Specifically, transistor T B2 is in the ON state when after the ID authentication is accomplished, carrying out common electric power transfer, when the situation of load-modulate etc., is in OFF.

Transistor T B1 (P type CMOS transistor) is by guaranteeing that from output the signal P4Q of circuit 54 controls.Specifically; Be in ON (conducting) when after the ID authentication is accomplished, carrying out common electric power transfer, on the other hand, detecting continuing of AC adapter; When perhaps supply voltage VD5 is lower than the minium operation voltage that receives controller for electric consumption 50 (control circuit 52), be in OFF (ending).

Receive controller for electric consumption 50 to carry out the various controls of current-collecting device 40.By IC apparatus realizations such as (IC).This supply voltage VD5 that can be generated by the induced voltage of secondary coil L2 by controller for electric consumption 50 comes work.In addition, receive controller for electric consumption 50 can comprise that control circuit 52 (receiving electric side), output guarantee circuit 54, position detecting circuit 56, oscillating circuit 58, frequency detection circuit 60, are full of power detection circuit 62.

Control circuit 52 (control part) carries out current-collecting device 40 and the control that receives controller for electric consumption 50, can be realized by gate array or microcomputer.Specifically, control circuit 52 carries out ID authentication, position probing, frequency detecting, load-modulate, or is full of necessary various SECO and determination processing such as electro-detection.

Output guarantees that circuit 54 is circuit of the output of the current-collecting device 40 of (during 0V) when guaranteeing low-voltage.Prevent the reverse charging to current-collecting device 40 sides from voltage output node NB7.

Position detecting circuit 56 is kept watch on the waveform of the signal ADIN of the induction voltage waveform be equivalent to secondary coil, and the position of primary winding and secondary coil is concerned whether correctly judge.Specifically,, use comparator to carry out 2 value transforms, perhaps use the A/D conversion to carry out rank and judge, thereby the position is concerned that correctness judges to signal ADIN.

Oscillating circuit 58 is made up of for example CR oscillating circuit, generates the clock of secondary side.The frequency of frequency detection circuit 60 detection signal CCMPI (f1, f2) shown in Fig. 3 (A), is " 1 " or " 0 " to the transmission data from power transmission device 10, judges.

Be full of power detection circuit 62 (charging testing circuit), whether the battery 94 (secondary cell) of load 90 is in is full of electricity condition (charged state) and detects.

Load 90 comprises the battery charge controller 92 that charging of battery 94 etc. is controlled.This battery charge controller 92 (charging control IC) is by realizations such as IC apparatus.In addition, as intelligent battery, also can let battery 94 itself have the function of battery charge controller.

Next, use the flow chart of Fig. 4,, send electric side (step S1) when power connection to carry out the temporary transient electric power transfer (step S2) that position probing is used sending electric side and described by the summary of the action of electric side.Through this electric power transfer, risen by the supply voltage of electric side, remove reset (the step S11) that receives controller for electric consumption 50.So, receive electric side that signal P1Q is set at the H level, P4Q is set at high impedance status (step S12).Based on this, transistor T B2, TB1 conducting simultaneously, being electrically connected between disconnection and the load 90.

Next, receive electric side use location testing circuit 56, whether the position relation of primary winding and secondary coil is correctly judged (step S13).Then, under the correct situation of position relation, receive electric side to begin the authentication processing of ID, to sending electric side to send authentication frame (step S14).Specifically, be based on the data that the illustrated load-modulate of Fig. 3 (B) is sent authentication frame.

Send electric side in a single day to receive authentication frame, to ID whether unanimity etc. judge (step S3).Then, under the situation that the ID authentication is passed through, make a promise frame (step S4) to sent by electric side.Specifically, data are sent in illustrated frequency translation based on Fig. 3 (A).

Receive electric side to receive the promise frame, and its content is under the situation of OK, to sending electric side to send the start frame (step S15, S16) of the contactless electric power transfer of beginning.On the other hand, send electric side to receive start frame, hold under the situation of OK within it, begin common electric power transfer (step S5, S6).Then, receive electric side to set signal P1Q, P4Q for L level (step S17).Based on this,,, begin to supply with (VOUT output) (step S18) to the electric power of load so can carry out electric power transfer to load 90 because transistor T B2, TB1 all are in ON.

3. amplitude detection

Fig. 5 has described the concrete formation example of the power transmission control device 20 of present embodiment.In Fig. 5; For example; When amplitude detecting circuit 28 detects the amplitude information of signal PHIN; The inductance of primary winding L1 with constitute resonant circuit capacitor volume value drift, perhaps during change such as supply voltage, then the detection voltage of amplitude detecting circuit 28 (crest voltage, amplitude voltage, virtual voltage) also changes.Thereby,, then might can't realize correct detection in case be used to judge that foreign matter detects, loading and unloading detect, the baseline threshold voltage of Data Detection is fixed value (judgement voltage).

Therefore; Adopted method shown in Figure 5 in the present embodiment, A/D translation circuit 29 be set, from assigned voltage (reference voltage) beginning of supposition in the moment of having passed through during given; Carry out the A/D conversion, revise the baseline threshold voltage that is used to detect judgement more automatically.

Specifically, set supposition assigned voltage SIGH0 shown in Figure 6.This supposition assigned voltage SIGH0 is crest voltage (broad sense detection voltage) and voltage crest voltage when load (TB3 be ON) arranged between, the for example SIGH0=2.5v of the load of load-modulate portion 46 of the current-collecting device 40 of Fig. 2 when being non-loaded (TB3 is OFF).In addition, suppose that assigned voltage SIGH0 can be by the variable setting of register.

A/D translation circuit 29, the moment t1 that surpasses supposition assigned voltage SIGH0 from the crest voltage (signal PHQ) of induced voltage signal PHIN begins, and the conversion moment t2 to having passed through TP specified time limit carries out the A/D conversion of crest voltage.Then, obtain the numerical data ADQ of baseline threshold SIGHV, and output.Latch cicuit 30 latchs this audio data AD Q.Control circuit 22 uses the latched data AD of institute, carries out foreign matter and detects, loads and unloads detection, Data Detection.That is, detecting the data that current-collecting device 40 sends through load-modulate is " 0 " or " 1 "; Detect the foreign matter (metal beyond the secondary coil) on the primary winding that is placed on charger, detect the loading and unloading (dismounting) that are placed on the electronic equipments such as mobile phone on the charger.

For example, receive the transistor T B3 of the load-modulate portion 46 of electric side to become ON at the moment of Fig. 6 t0, changed to load (load connection) from non-loaded (load is disconnected), then the crest voltage of induced voltage signal PHIN rises.In Figure 15, set the supposition assigned voltage SIGH0 (supposition threshold voltage) of the rising that is used to detect such crest voltage.This supposition assigned voltage SIGH0 when to receive electric side be non-loaded, is the voltage that does not surpass, and when crest voltage surpasses SIGH0, can judge to receive electric side connecting load really.Therefore, begin to through TP during fully from this moment t1, the moment t2 after the level equalization of crest voltage gets off carries out the A/D conversion, obtains baseline threshold voltage SIGHV.Specifically, control circuit 22 begins from the moment t1 that surpasses supposition assigned voltage SIGH0, usage counter 102 begin counting handle (count value add one or subtract one).Then, the conversion moment t2 in that the count value based on counter 102 sets carries out the A/D conversion, and control A/D translation circuit 29 is obtained baseline threshold voltage SIGHV.

Then, control circuit 22 carries out foreign matter and detects, loads and unloads and detect or Data Detection based on this baseline threshold voltage SIGHV.Specifically, carry out the addition or the subtraction of the parameter voltage that foreign matter detects, loading and unloading detect, Data Detection needs, thereby obtain the threshold voltage that foreign matter detects, loading and unloading detect, Data Detection needs to baseline threshold voltage SIGHV.Then, based on these threshold voltages, carry out foreign matter and detect, load and unload at least one in detection, the Data Detection.

Fig. 7 has described and has been used to obtain Data Detection and detects with, foreign matter with, overload and detect the example of threshold value table 100 that detects threshold voltage VSIGH, VOVER, VMETAL, the VLEAVE of usefulness with, loading and unloading.Control circuit 22 uses this threshold value table 100, obtains VSIGH, VOVER, VMETAL, VLEAVE.For example, the threshold voltage VSIGH that Data Detection is used to baseline threshold voltage SIGHV, obtains through the subtraction of the parameter voltage PV1 that uses with Data Detection.Equally; VOVER obtains through the add operation that detects the parameter voltage PV2 of usefulness with overload SIGHV; VMETAL obtains through the add operation that detects the parameter voltage PV3 of usefulness with the foreign matter lotus SIGHV, and VLEAV obtains through the subtraction that detects the parameter voltage PV4 of usefulness with loading and unloading SIGHV.

In addition, in embodiments of the present invention, at first carry out overload and detect, after overload detected, the voltage that carries out voltage detecting circuit 14 was cut apart the switch control of node, carried out foreign matter and detected, loads and unloads and detect.At this moment, parameter voltage PV1, PV2, PV3, PV4 are set at for example 0.3v, 0.8v, 0.8v, 0.1v.For example, when SIGHV=3.0v, VSIGH=3.0-0.3=2.7v, the threshold voltage VSIGH that Data Detection is used are the voltage between baseline threshold voltage SIGHV (3.0v) and the supposition assigned voltage SIGH0 (2.5v).

Method through above present embodiment; When the inductance of coil or condenser capacity value or power supply voltage variation; Corresponding with this change; Baseline threshold is lower than SIGHV also to be changed, and threshold voltage VMETAL, VLEAVE, the VSIGH that the foreign matter detection is used, loading and unloading are used, Data Detection is used that obtain through SIGHV also change.That is, with corresponding with the baseline threshold voltage SIGHV of variations such as element drift, threshold voltage VMETAL, VLEAVE, VSIGH also revise automatically.Therefore, the drift of absorber element automatically realizes the stable detection action.And the A/D conversion of baseline threshold voltage SIGHV begins from using SIGH0 to detect the load moment t1 from non-loaded to loaded that receives electric side really, and the moment t2 to through TP during sufficient is performed always.Thereby, can prevent to detect wrong baseline threshold voltage SIGHV, can realize not having the stable detection action of erroneous detection.

In addition, secondary coil L2 is near the process of primary winding L1, and when perhaps placing foreign matter, crest voltage surpasses supposition regulation SIGH0 sometimes.But at this moment, the sequential of the load-modulate after this is inconsistent with the sequential of predesignating, so ID authentication meeting mistake and restarting, and therefore, problem can not take place.

In addition, the detection voltage that Fig. 6 has described amplitude detecting circuit 28 is the example of crest voltage, but amplitude information is not limited to crest voltage, also can be the physical quantity of size of the amplitude of expression induced voltage signal.For example, can be the actual effect electric power of the electric power of expression induced voltage signal, also can be the amplitude voltage of induced voltage signal itself.

4. constitute example in detail

Fig. 8 has described the detailed formation of amplitude detecting circuit 28, A/D translation circuit 29.In Fig. 8, amplitude detecting circuit 28 comprises operational amplifier OPA1, OPA2 and maintenance capacitor CA1 and resets with N transistor npn npn TA1.Operational amplifier OPA1 has signal PHIN in its non-counter-rotating input terminal input, connects the output node NA5 of operational amplifier OP2 at its reverse turn.Keep capacitor CA1 and reset being arranged between the operational amplifier with N transistor npn npn TA1.Operational amplifier OPA2 is at its non-counter-rotating input terminal

By operational amplifier OPA1, OPA2, the maintenance capacitor CA1 of Fig. 8, resetting has constituted peak holding circuit (testing circuit) with transistor T A1.That is, the crest voltage from the detection signal PHIN of voltage detecting circuit 14 is maintained at node NA4, the peak voltage signal of this maintenance, and the operational amplifier OPA2 that is connected by voltage follow is by impedance conversion, and is exported to node NA5.

Resetting is in ON with transistor T A1 at reseting period, will keep node NA4de electric charge to be sidelong to GND.That is, operational amplifier OPA1 just keeping capacitor CA1 to go out to accumulate electric charge, has become operational amplifier from electric type to GND that can not be sidelong.Therefore, the rising of crest voltage that can trace signals PHIN, but the decline that can not follow the trail of crest voltage.And there is leakage current in the transistor that is arranged on the P type that the electric charge accumulation of the efferent of operational amplifier OPA1 uses, therefore, even when this P transistor npn npn is in OFF, as long as through long-time, keeps the voltage of node NA4 to rise.Therefore, be necessary regularly to reset and keep the voltage of node NA4.Because above reason in Figure 17, is keeping node NA4 to be provided with the transistor T A1 of the usefulness that resets.

For example, in the present embodiment, receive electric side to detect (choosing) clock, and carry out load-modulate with this clock synchronization from sending electric side.Thereby, receive the load-modulate of electric side and send the clock synchronization of electric side to carry out, therefore, send electric side can detect the moment of the load-modulate that receives electric side arbitrarily.Therefore, control circuit 22 determines the load switching instant of the load-modulate that receives electric side, is comprising the reseting period of measuring switching instant, carries out discharging to the GND side control that resets of the electric charge that keeps node NA4.Based on this, when employing can not be followed the trail of the OPA1 of crest voltage decline type, can realize that also correct peak value keeps action.In addition, when waiting for that crest voltage surpasses the standby mode of supposition assigned voltage SIGH0, keep the voltage of node NA4, can prevent the rising of the sustaining voltage that leakage current caused of the P transistor npn npn of operational amplifier OPA1 through regularly resetting.

Fig. 9 is the signal waveform example that is used for the action of amplitude detecting circuit 28.As shown in Figure 9, signal PHIN has become the signal by 14 halfwave rectifier generations of voltage detecting circuit of half-wave rectifying circuit.The output signal OPQ of operational amplifier OPA1, during the pulse generation of signal PHIN, its voltage rises; Between the non-emergence period of pulse, its voltage remains on and keeps among the capacitor CA1, and is kept.Then, the output signal PHQ of the operational amplifier OPA2 peak value of trace signals PHIN smoothly.

A/D translation circuit 29 comprises sampling hold circuit 110, comparator C PA1, comparand register 112, D/A translation circuit 114 one by one.Sampling hold circuit 110 sampling and inhibit signal PHQ.Comparator C PA1 is relatively from the analog signal DAQ after the D/A conversion of D/A translation circuit 114 with from the sampling inhibit signal SHQ of sampling hold circuit 110.Comparand register 112 (comparison control circuit one by one) storage is from the data of the output signal CQ1 of comparator C PA1 one by one.D/A translation circuit 114D/A conversion is from for example 8 the numerical data SAQ of comparand register 112 one by one, output analog signal DAQ.

At this one by one relatively in the A/D translation circuit 29 of type, comparator C PA1 relatively only is made as signal DAQ and input signal SHQ (PHQ) after 1 the D/A conversion to MSB (highest order).And, if more just being provided with MSB, the voltage of signal SHQ is " 1 ", if the less MSB that just is provided with is " 0 ".And A/D translation circuit 29 also carries out same comparison process one by one to following everybody.And, the numerical data ADQ that finally obtains is exported to latch cicuit 30.In addition, A/D translation circuit 29 is not limited to the formation of Fig. 8, also can be comparison A one by one/D translation circuit that each exclusive-OR circuit constitutes, and also can be to follow the trail of relatively type, the A/D translation circuit of type, double product somatotype etc. relatively side by side.

Figure 10 is the signal waveform example of action that is used for the circuit of key diagram 8.At moment t11, in case reset signal RST becomes the L level, resetting is disengaged, and then the signal PHQ of crest voltage rises a little.At moment t12 after this, in case receive electric side (secondary side) to be changed to load from non-loaded, crest voltage rises more, in case surpass supposition assigned voltage SIGH0, just begins the counting action of counter 102 at moment t13.Then, the t14 constantly that resets of TP1 during having passed through (for example 104CLK), signal RST becomes the H level, and transistor T A1 is in ON, discharges the electric charge that keeps node NA4 to the GND side.So, crest voltage begins to descend.Then, through reseting period TP2 (for example 32CLK), in case due in t15 be that load is arranged because receive electric side, so crest voltage rises once again.After this, the conversion of TP3 during process (for example 32CLK) is t16 constantly, based on the 29 beginning A/D conversion of A/D translation circuit, obtains the numerical data of baseline threshold voltage SIGHV.Then, the moment t17 of TP4 during having passed through (for example 64CLK), latch signal LAT1 becomes the H level, and latch cicuit 30 latchs the numerical data of baseline threshold voltage SIGHV.

So in Figure 10, the moment that surpasses supposition assigned voltage SIGH0 from crest voltage (PHQ) begins to carry out discharging to the low potential side power supply control that resets of the electric charge that keeps node NA4 to the t14 constantly that resets through TP1 the first phase.Then, t14 begins to carry out the A/D conversion of crest voltage to the conversion moment t16 that has passed through the second phase (TP2+TP3) from resetting constantly, obtains the numerical data of baseline threshold voltage SIGHV.

That is, surpass after the supposition voltage SIGH0, during TP1 through after, reseting period TP2 is set, and temporarily resets and keep the voltage of node NA4.Then, during TP3 during wait for that the output of amplitude detecting circuit 28 settles out, afterwards, start A/D translation circuit 29, beginning A/D conversion.So, the voltage that keeps node NA4 of resetting makes crest voltage carry out the A/D conversion again after settling out, and therefore, can improve the accuracy of detection of baseline threshold voltage SIGHV.

5. first variation

Figure 11 shows first variation of present embodiment.Structure and switching circuit SW1, the SW2 of voltage detecting circuit 14 have been to append with the difference of Fig. 8.

The voltage detecting circuit 14 of Figure 11 is set between the node NA2 and GND (low potential side power supply) of an end of primary winding L1, includes the resistance R A1, RA2 and the RA3 that are connected in series.Constitute voltage divider circuit by these resistance R A1, RA2, RA3.And, the induced voltage signal PHIN1 of primary winding L1, the voltage that PHIN2 (half rectified signal) exports to voltage divider circuit are cut apart node NA31, NA32.And control circuit 22 carries out switch control, is imported into amplitude detecting circuit 28 with the induced voltage signal that detects at Data Detection and foreign matter, cut apart node from different voltages with different during the loading and unloading detection.

Specifically, when carrying out Data Detection, switching circuit SW1 conducting (being in conducting state), the signal PHIN of cutting apart node NA31 from first voltage is imported into amplitude detecting circuit 28 as signal PHIN, detects crest voltage (amplitude information).On the other hand; When carrying out overload detections such as foreign matter detection or loading and unloading detect; Switching circuit SW2 is in conducting state, from second cut apart node NA32 signal PHIN2 be imported into amplitude detecting circuit 28 as signal PHIN, detect crest voltage (amplitude information).

In addition, switching circuit SW1, SW2 are such as being that drain electrode by P transistor npn npn and N transistor npn npn constitutes with common transmission gate that is connected of source electrode etc.In addition, the conducting of switching circuit SW1, SW2, control by switching signal SC1, the SC2 of origin Self Control circuit 22.That is to say, according to switching signal SC1, SC2, control constitute switching circuit SW1, SW2 transistorized conducting, end.

Figure 12 shows the flow chart of the action that is used to explain first variation.The processing of Figure 12 is the processing of often carrying out in the state (state) of common Data Detection pattern.

At first, actuating switch circuit SW1 is by switching circuit SW2 (step S21).These conductings, the control origin of ending are carried out at switching signal SC1, the SC2 of control circuit 22.Based on this, the signal PHIN of cutting apart node NA31 from voltage is imported into amplitude detecting circuit 28 as signal PHIN, can detect from the transmission data that receive electric side.

Next, judge whether peak voltage signal PHQ surpasses overload illustrated in fig. 7 (overload) and detect with threshold voltage VOVER (step S22).And, be in load condition when being judged as three times (broadly for repeatedly) when surpassing continuously, being judged as, make switching circuit SW1 conducting, switching circuit SW2 by (step S23).Based on this, the signal PHIN2 of cutting apart node NA32 from voltage is imported into amplitude detecting circuit 28 as signal PHIN, can detect the overload condition of foreign matter detection and loading and unloading detection etc.

Then, judge that the foreign matter whether peak voltage signal PHQ explains above Fig. 7 detects with threshold voltage VMETAL (step S24).Then, carry out such control, have foreign matter, the red LED bright (step S25) that the warning foreign matter is existed when being judged as continuous three times (repeatedly) when surpassing, being judged as.Then, turn back to the preceding initiation state mode (the for example step S2 of Fig. 4) of ID authentication.

On the other hand, when peak voltage signal does not surpass VMETAL, judge that PHQ whether above loading and unloading with threshold voltage VLEAVE (step S26) when not surpassing, returns step S21.Based on this, switching circuit SW1 is in conducting state, and switching circuit SW2 is in cut-off state.Return common Data Detection pattern.On the other hand, when PHQ surpasses VLEAVE.Judge and carried out the loading and unloading (pulling down) (step S27) of electronic equipment.And the originate mode before the return authentication.

Like this; In first variation; At first carry out the induced voltage signal PHIN1 of cutting apart node NA31 from first voltage is input to the switch control (step S21) of amplitude detecting circuit; Carry out and to cut apart the switch control (step S23) that the induced voltage signal PHIN2 of node NA32 is input to amplitude detecting circuit 28 from cutting apart the second different voltage of node NA31, carry out foreign matter and detect, load and unload and detect (step S24-S27) with first voltage.

That is to say that when being in overload condition, compare when carrying out Data Detection, it is very big that crest voltage becomes.Thereby, needn't change that voltage is cut apart node and when using operational amplifier OPA1, OPA2 to want to detect the crest voltage of overload condition, it is difficult that the design of the operation margin of operational amplifier OPA1, OPA2 becomes.

In this, in Figure 11, Figure 12, when being judged as overload condition, cutting apart node with the voltage of Data Detection and compare, detect crest voltage through the signal PHIN2 of cutting apart node NA32 from the voltage of low potential side more.Like this, if change voltage is cut apart node,, be input to the peak value step-down of the signal of amplitude detecting circuit 28 even when coil-end voltage is higher.Thereby, use shared operational amplifier OPA1, OPA2 can realize detecting or the loading and unloading detection as the foreign matter of overload condition, can make the design of the operation margin of operational amplifier become easy.

6. second variation

Figure 13 shows second variation of present embodiment.In this variation, add the amplitude detection of induced voltage signal, also can carry out pulse duration and detect.The difference of Figure 13 and Fig. 8 is: appended waveform shaping circuit 32, pulse width detection circuit 33, latch cicuit 34 etc.And; The formation of variation is not limited to Figure 13; Also can omit the for example formation element of A/D translation circuit 29 or waveform shaping circuit 32 etc., become substituting of translation circuit 29, also can be provided for a plurality of comparators of comparison peak threshold voltage and threshold voltage as A/D.

Drive clock generative circuit 25 generates the drive clock DRCK of the driving frequency that is used for regulation primary winding L1.Specifically, the reference clock CLK that is generated by oscillating circuit 24 is carried out frequency division, generate drive clock DRCK.The alternating current of the driving frequency of this drive clock DRCK is supplied to among the primary winding L1.

Driver control circuit 26 generates the driver control signal based on drive clock DRCK, export to drive primary winding L1 send electric portion 12 send electric drive (first, second send electric drive).At this moment; In order in formation is sent the negative circuit (DC/AC translation circuit) of electric drive, not have perforation electric current to flow through; Inputing to the signal of grid of signal and N transistor npn npn of grid of the P transistor npn npn of negative circuit (DC/AC translation circuit), need be non-overlapped signal each other.At this moment, driver control circuit 26 generates this driver control signal.

Pulse duration degree testing circuit 33 detects the pulse width information of the induced voltage signal PHIN of primary winding L1.Specifically; Acceptance is from the waveform shaping signal WFQ of waveform shaping circuit 32 with from the drive clock DRCK (driver control signal) of drive clock generative circuit 25; Through detecting the pulse width information of waveform shaping signal WFQ, detect the pulse width information of induced voltage signal PHIN.

Further; Pulse width detection circuit 33; Change to first beginning (rising edge for example of the voltage level (for example H level) of activation by nonactivated voltage level (for example L level) from drive clock DRCK (driver control signal); Drive starting point), change to second of nonactivated voltage level (for example L level) by the voltage level (for example H level) that activates to waveform shaping signal WFQ till (for example trailing edge, driving end point); During the pulse duration of metering, detect pulse width information as this period.For example, detecting the voltage signal that the change in voltage by drive clock DRCK causes surpasses during the pulse duration of defined threshold.And, the size of the pulse duration of the pairing waveform shaping signal of the pulse duration WFQ (induced voltage signal) of detection drive clock DRCK.Detection during the pulse duration of this moment is used and is carried out like reference clock CLK.And, the testing result data PWQ of pulse width detection circuit 33 by, latch by latch cicuit 34.Specifically, pulse width detection circuit 33 is based on reference clock CLK, uses the counter that adds an operation that carries out count value, length during the metrical pulse width, and data PWQ of its metering result latched by latch cicuit 34.

Control circuit 22 detects the load change (height of load) of secondary side (current-collecting device 40 sides) based on pulse width detection circuit 33 detected pulse width information.Specifically, the pulse width information that control circuit 22 detects based on pulse width detection circuit 33 detects the data that current-collecting device 40 is seen off through load-modulate.Perhaps, carry out the overload status detection of foreign matter detection and loading and unloading etc.

More specifically, control circuit 22 according to detected by pulse-detecting circuit 33 and by latch cicuit 34 pretending to be of latching the data PWQ (pulse width information) during wide, carry out Data Detection.In addition, try to achieve, use the numerical data of the baseline threshold voltage that is latched by latch cicuit 30 to load and unload detection through amplitude detecting circuit 28, A/D translation circuit.The threshold voltage that the loading and unloading for example illustrated in fig. 7 of cutting detect usefulness loads and unloads detection.

And in Figure 13, amplitude detection latchs the audio data AD Q (the for example data of baseline threshold voltage) from A/D translation circuit 29 with first latch cicuit 30 according to latch signal LAT1.In addition, detecting with the latching the synchronous moment in the moment of second latch cicuit 30, latch data from pulse width detection circuit 33 with pulse duration.Specifically, first, second latch cicuit 30,34 is according to latch signal LAT1, the LAT2 latch data in the identical moment.

Like this, detect the data that obtain through pulse duration and latch in the identical moment, can be input to control circuit 22 with the data that obtain through amplitude detection.Based on this, can keep pulse duration to detect and amplitude detection between circuit interchangeability, can make the simplification that becomes of sequential processing and the judgment processing of control circuit 22.

Figure 14 (A), Figure 14 (B) have described the mensuration result of the coil-end voltage waveform of primary winding L1.Figure 14 (A), Figure 14 (B) are respectively the voltage waveforms when receiving the load current of electric side to be 150mA, 300mA.TPW during given setting voltage VR and above pulse duration thereof is short more for load current bigger (load is high more), coil-end voltage.Thereby, through detecting TPW during this pulse duration, can judge the height of load of the load-modulate portion 46 of current-collecting device 40, can judge that from the data that receive electric side are " 0 " or " 1 ".For example shown in Fig. 3 (B), the low load of regulation is " 0 ", and high capacity is " 1 ".At this moment, long during the reference pulse width that TPW is more given during the pulse duration then is low load, therefore can be judged to be " 0 ", if short, because be high capacity, can be judged as " 1 ".

Figure 15 has described the relation of drive clock DRCK (driver control signal) and coil-end voltage waveform.Drive clock DRCK is H level (activation) at moment t21, is L level (non-activation) at moment t22.On the other hand, coil-end voltage becomes the moment t21 of L level at drive clock DRCK, sharply rises, and after this, descends.And, shown in figure 15, receive the load of electric side low more, the decline of the voltage of coil-end is releived more.Therefore, receive the load of electric side low more, coil-end voltage (induced voltage signal) is in during setting voltage and the above pulse duration thereof of regulation long more.Thereby,, can judge that the load that receives electric side is any in low load, middle load, high capacity, the overload through during detecting this pulse duration.

For example, can consider to judge the load change that receives electric side according to the phase characteristic of load.The phase characteristic of so-called load here is meant the phase difference of voltage, electric current.Use this method, circuit constitutes can be very complicated, can cause cost to improve.

Relative therewith, the pulse duration detection method of present embodiment is utilized voltage waveform, can use simple wave form shaping circuit and counting circuit to carry out digitized processing, so there is circuit to constitute the advantage of oversimplifying.In addition, the working voltage waveform is realized also becoming easily with the combination of the amplitude detection method that detects load change.

And the setting voltage VR that uses as the metrical pulse width (for example the above voltage of 0V, the voltage that the threshold voltage of N transistor npn npn is above) can suitably select to set the only voltage of accuracy of detection of load change.

Figure 16 has described the concrete formation example of second variation.In Figure 16, waveform shaping circuit 32 comprises, is connected on resistance R C1 and N property transistor T C1 between VDD (hot side power supply) and the GND, and negative circuit (DC/AC translation circuit) INVC.Input has the signal PHIN from voltage detecting circuit 14 on the grid of transistor T C1.And in a single day signal PHIN is higher than the threshold voltage of transistor T C1, and then TC1 becomes ON, and the transformation of node NC1 becomes the L level, so waveform shaping signal WFQ becomes the H level.On the other hand, in case signal PHIN is lower than threshold voltage, then waveform shaping signal WFQ becomes the L level.

In addition, the formation of waveform shaping circuit 32 is not limited to formation shown in Figure 16.Going up input at its non-counter-rotating input terminal (the first terminal) has signal PHIN, and going up input at its counter-rotating input terminal (second terminal) has setting voltage VR, constitutes waveform shaping circuit 32 by the comparator C PC1 of this spline structure and also is fine.If use such comparator C PC1, can adjust setting voltage VR arbitrarily, therefore can improve the accuracy of detection of load change.

Pulse width detection circuit 33 comprises counter 122.This counter 122 carries out one (or the subtracting one) that add of count value during pulse duration operates, based on the length during the count value calculating pulse duration that is obtained.At this moment, counter 122 carries out the counting of count value and handles based on for example reference clock CLK.

Further, pulse width detection circuit 33 comprises enable signal generative circuit 120, and this enable signal generative circuit 120 receives waveform shaping signal WFQ and drive clock DRCK, during pulse duration, generates the enable signal ENQ of state of activation.And under the situation of enable signal ENQ for activation (for example H level), counter 122 carries out one (perhaps the subtracting one) that add of count value to be operated.

This enable signal generative circuit 120 has drive clock DRCK in its clock terminal input, in its data terminal input VDD (broadly being the hot side power supply) is arranged, and when waveform shaping signal WFQ was in non-activation (L level), it was made up of circuit triggers device FFC1.Based on this flip-flop circuit FFC1, be in state of activation (H level) afterwards at waveform shaping signal WFQ, in a single day drive clock DRCK becomes activation (H level), becomes activation (H level) as its enable signal ENQ that exports signal.After this, in case waveform shaping signal WFQ generally becomes non-activation (L level), then trigger (Flip Flop, bistable multivibrator) circuit FFC1 is reset, and the enable signal ENQ of its output signal becomes non-activation (L level).Thereby counter 122 is in the length between active period through using reference clock CLK to calculate enable signal ENQ, calculates during the pulse duration.

In addition; Enable signal generative circuit 120 has drive clock DRCK in its clock terminal input; Be connected with GND (low potential power source) in its data terminal; Thereby when waveform shaping signal WFQ is in unactivated state, can use flip-flop circuit to constitute enable signal generative circuit 120, can enter counter 122 as enable signal ENQ.

The count value CNT (pulse width information) that count value holding circuit 124 keeps from counter 122.And the data LTQ2 of the count value of this maintenance is exported to output circuit 126.

Output circuit 126 (filter circuit, core circuit) is accepted the data LTQ2 by count value that count value holding circuit 124 keeps, dateout PWQ.This output circuit 126 can comprise comparison circuit 130, keeps the count value of (preservations) and the count value that was kept last time through count value holding circuit 134 these institutes relatively, exports the count value than greatly once.Based on this, can and export peaked count value from output circuit 126 maintenances.Therefore, the change during the pulse duration that inhibition noise etc. causes just becomes possibility, also can realize the detection of stable pulse duration.In addition, the combination with the amplitude detection method realizes also having become easily.

In addition, also can constitute output circuit 126, the mean value (rolling average) of a plurality of count values that its count holding circuit 124 is kept by averaging circuit.

Figure 17 has described the signal waveform example of the action of the circuit that Figure 16 is described.In case WFQ becomes the H level at moment t31 waveform shaping signal, resetting of flip-flop circuit FFC1 is disengaged.Then, at moment t32, in case drive clock DRCK becomes the H level, rise the edge above that, the voltage of VDD is absorbed to flip-flop circuit FFC1, and based on this, enable signal ENQ becomes the H level by the L level.Its result, counter 122 begins counting to be handled, and TPW during the use reference clock CLK calculating pulse duration degree.

Next, and constantly (regularly, Timing) t33, in case waveform shaping signal WFQ becomes the L level, flip-flop circuit FFC1 is reset, enable signal ENQ becomes the L level from the H level.Based on this, the counting of counter 122 is handled and just is through with.Then, handle the count value that is obtained, just become the result of calculation of TPW during the indicating impulse width degree based on this counting.

In Figure 17, WFQ becomes the H level at moment t34 waveform shaping signal equally, and ENQ becomes the H level at moment t35 enable signal, handles thereby begin counting.Then, through becoming the L level, handle thereby finish counting at moment t36 waveform shaping signal WFQ and enable signal ENQ.Then, handle the result of calculation that the count value that is obtained has just become TPW during the indicating impulse width through this counting.

And, shown in figure 17, be when hanging down load receiving electric side, because TPW is elongated during the pulse duration, so count value becomes big.On the other hand, when receiving electric side to be high capacity, because TPW shortens during the pulse duration, count value just diminishes.Thereby control circuit 22 can be judged the height of the load that receives electric side based on the size of this count value.

Figure 18 (A) has described the variation characteristic of pulse duration, and Figure 18 (B) has described the oscillation amplitude change characteristic.At Figure 18 (A), transverse axis is the load current amount that receives electric side, and the longitudinal axis is the count value (during the pulse duration) of counter 122.On the other hand, at Figure 18 (B), transverse axis is the load current amount that receives electric side, and the longitudinal axis is the amplitude (crest voltage) of coil-end voltage.

In the pulse width variation characteristic of Figure 18 (A), shown in E1, the load current amount is little, during low load, and the rate of change of the count value that the variation of load current amount is corresponding is big, and susceptibility is high.On the other hand, shown in E2, the load current amount is big, during high capacity, and the rate of change of the count value that the variation of load current amount is corresponding is little, and susceptibility is low.Its reason is, when being that normal coil is coupled, owing to the restriction of the degree of coupling, along with the phase place that load becomes in heavy duty-phase characteristic is rotated the saturated of meeting change.

On the other hand, in the amplitude variations characteristic of Figure 18 (B), shown in F1, when hanging down load, the rate of change of the coil-end voltage that the variation of load current amount is corresponding is little, and susceptibility is low.Shown in F2, during high capacity, the rate of change of the counter that the variation of load current amount is corresponding is big, and susceptibility is high.

Like this, pulse duration detects, and compares with high load area, and the detection sensitivity of low load area is higher.On the other hand, in the amplitude detection, high load area is higher than the detection sensitivity of low load, thereby when low load area load change, expectation uses the pulse duration detection to remove to judge the height of load; When the high load area load change, expectation uses amplitude detection to remove to judge the height of load.Through distinguishing the use detection mode, can realize the detection of load change efficiently at low load area and high load area.

Specifically, for example when detecting the data of sending, load on lower load area change by load-modulate.Thereby for detecting the data that current-collecting device 40 sends through load-modulate, expectation is carried out based on pulse width detection circuit 33 detected pulse width information.On the other hand, when the overload state of foreign matter detection and loading and unloading detection etc., expect the high sensitive of high load area, detect and load and unload for foreign matter and detect, expect to carry out based on amplitude detecting circuit 28 detected amplitude informations.Through such operation, can be with high sensitive, realize that Data Detection, foreign matter detect, loading and unloading detect expeditiously.

And, also can just carry out Data Detection according to situation with amplitude detecting circuit 28 detected amplitude informations, perhaps, carry out foreign matter based on pulse width detection circuit 33 detected next pulse width information and detect and load and unload detection etc.For example, when Data Detection, in high load area, in the load change, carry out Data Detection, perhaps, unite and use amplitude information and pulse width information to carry out Data Detection based on amplitude information.On the other hand; During the situation of the low system of supply voltage that the supply capacity of power supply is low, overload causes etc.; Can carry out foreign matter based on pulse width information and detect and load and unload and detect, perhaps, unite and use amplitude information and pulse width information to carry out foreign matter detection and loading and unloading detection.

Such as detecting about foreign matter; As stated, can be according to being undertaken by amplitude detecting circuit 28 detected amplitude informations, but; Both can use amplitude information or pulse width information to carry out again according to being undertaken by pulse width detection circuit 33 detected pulse width information.

For example Figure 19 has described the relation between the count value that foreign matter is big or small and pulse duration detects.Variation characteristic when G1 is normal load.When G2 is the normal load of non-foreign matter, once surveying the convergence transversal line that (current-collecting device) calculates the count threshold that obtains.Like the variation characteristic of G3, count value can the decision bits foreign matter in the count threshold of G2 and when following.That is, variation characteristic that can not detected foreign matter during G3 by amplitude detection, the coupling between itself and coil outside the anticipation, can observe should not be the phase place rotation count value that caused, less of normal load (G1), so decidable is a foreign matter.Through detection method and the amplitude detection that makes up this Figure 19, can carry out the more detection of intelligence and handle.

And, as stated, specify to embodiments of the invention, as long as portion breaks away from innovation item of the present invention and effect, can be by all distortion, this is to understand easily for the practitioner.Thereby such variation also all comprises within the category into of the present invention.For example; In detail specifications or picture; At least once; With the term (GND, VDD, crest voltage, mobile phone/charger etc.) that the different term of broad terms or synonym more (low potential side power supply, hot side power supply, detect voltage, electronic equipment etc.) uses simultaneously, the arbitrary place in detailed book or picture can agree that different term exchanges with it and use.In addition, all combinations of present embodiment and variation are also included within the category of the present invention.In addition, power transmission control device, power transmission device, the formation that receives controller for electric consumption, current-collecting device, action and pulse duration detection method, amplitude detection method are not limited to the explanation that present embodiment is done, and can have various distortion to realize.

Description of reference numerals

The L1 primary winding; L2 2 secondary coils; 10 power transmission devices; 12 send electric portion; 14 voltage detecting circuits; 16 display parts; 20 power transmission control devices; 22 control circuits (sending electric side); 24 oscillating circuits; 25 drive clock generative circuits; 26 driver control circuits; 28 amplitude detecting circuits; The 29A/D translation circuit; 30 latch cicuits; 32 waveform shaping circuits; 33 pulse width detection circuit; 34 latch cicuits (LatchCircuit); 40 current-collecting devices; 42 power receiving sections; 43 rectification circuits; 46 load-modulate portions; 48 power supply control parts; 50 receive controller for electric consumption; 52 control circuits (receiving electric side); 54 outputs guarantee circuit; 56 position detecting circuits; 58 oscillating circuits; 60 frequency detection circuits; 62 are full of power detection circuit; 90 loads; 92 battery charge controllers; 94 batteries; 100 threshold value tables; 102 counters; 110 sampling hold circuits; 112 comparand registers one by one; The 114D/A translation circuit; 120 enable signal generative circuits; 122 counters; 124 count value holding circuits; 126 output circuits; 130 comparison circuits.

Claims (16)

1. power transmission control device; Be arranged in the power transmission device in the non-contact power transmitting system; Said non-contact power transmitting system makes primary winding and secondary coil electromagnetic coupled, from said power transmission device to the current-collecting device transferring electric power, and to the load supply capability of said current-collecting device; Said power transmission control device is characterised in that, comprising:

Amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding;

The A/D translation circuit is used to carry out the A/D conversion of detected said amplitude information; And

Control circuit is used to control said power transmission device,

Said A/D translation circuit with begun to pass through from the moment of utilizing the detected detection voltage of said amplitude detecting circuit to surpass the supposition assigned voltage during given conversion constantly, detect the A/D conversion of voltage, try to achieve the numerical data of baseline threshold voltage,

Said control circuit uses the numerical data of said baseline threshold voltage, and detection, the foreign matter that carries out the data that said current-collecting device sends through load-modulate detects and at least a in detecting of loading and unloading.

2. power transmission control device according to claim 1 is characterized in that:

Said control circuit; Surpassing the moment of supposing assigned voltage from detecting voltage, usage counter begins counting to be handled, and said control circuit is controlled said A/D translation circuit; Thereby, carry out said A/D conversion constantly in the said conversion of setting according to the count value of said counter.

3. power transmission control device according to claim 1 and 2 is characterized in that:

Said supposition assigned voltage is that detection voltage and the load of said load-modulate portion of the load of the load-modulate portion that has of said current-collecting device when being non-loaded is the voltage between the detection voltage when load is arranged.

4. power transmission control device according to claim 1 and 2 is characterized in that:

Said control circuit is according to carrying out Data Detection that add operation or subtraction obtain with parameter voltage with respect to said baseline threshold voltage and detect with threshold voltage or loading and unloading detection with threshold voltage, foreign matter and use threshold voltage through Data Detection is detected to detect with parameter voltage or loading and unloading with parameter voltage, foreign matter, carries out Data Detection, foreign matter detection and loads and unloads at least a in the detection.

5. power transmission control device according to claim 1 and 2 is characterized in that:

Said amplitude detecting circuit remains on the maintenance node through the crest voltage with the induced voltage signal of said primary winding, thereby detects the crest voltage as said amplitude information,

The control that resets of said control circuit has begun to pass through resetting constantly between the first phase in the moment that surpasses said supposition assigned voltage from crest voltage, to the discharge electric charge of said maintenance node of low potential side power supply,

Said A/D translation circuit is tried to achieve the numerical data of said baseline threshold voltage constantly having begun to pass through the conversion of the second phase and carry out the A/D conversion of crest voltage constantly from said resetting,

Wherein, said comprising during given between the said first phase and the said second phase.

6. power transmission control device according to claim 1 and 2 is characterized in that:

Said power transmission device comprises voltage detecting circuit; Said voltage detecting circuit has the node of an end that is arranged on said primary winding and the voltage divider circuit between the low potential side power supply; And cut apart the induced voltage signal that node is exported said primary winding to the voltage of said voltage divider circuit

Said control circuit carries out switch control so that when Data Detection, detect with foreign matter, during the loading and unloading detection, the induced voltage signal of cutting apart node from said voltage is imported into said amplitude detecting circuit.

7. power transmission control device according to claim 6 is characterized in that:

Be provided with in the said voltage divider circuit that first voltage is cut apart node and second voltage is cut apart node,

Said control circuit is detecting when overload through carrying out that the induced voltage signal of cutting apart node from said first voltage is input to said amplitude detecting circuit; Carrying out will be from cutting apart the switch control that induced voltage signal that different said second voltage of node cuts apart node is input to said amplitude detecting circuit with said first voltage, carries out that foreign matter detects, loading and unloading detect.

8. power transmission control device according to claim 1 and 2 is characterized in that, also comprises:

Pulse width detection circuit, said pulse width detection circuit are used to detect the pulse width information of the induced voltage signal of said primary winding,

Said control circuit carries out Data Detection according to the said pulse width information that is detected by said pulse width detection circuit, uses the numerical data of said baseline threshold voltage to load and unload detection.

9. power transmission control device according to claim 8 is characterized in that, also comprises:

The drive clock generative circuit generates the drive clock of the driving frequency be used to stipulate said primary winding;

Driver control circuit generates the driver control signal based on said drive clock, and exports to the electric drive that send that drives said primary winding;

Waveform shaping circuit carries out waveform shaping to the induced voltage signal of said primary winding, and the output waveform reshaping signal,

Said pulse width detection circuit is accepted said waveform shaping signal and said drive clock, detects the pulse width information of said waveform shaping signal.

10. a power transmission device is characterized in that, comprising:

According to each the described power transmission control device in the claim 1 to 9; And

Send electric portion, generate alternating voltage, and supply with and give said primary winding.

11. an electronic equipment is characterized in that: comprise power transmission device according to claim 10.

12. non-contact power transmitting system; Comprise power transmission device and current-collecting device, through making primary winding and secondary coil electromagnetic coupled, from said power transmission device to said current-collecting device transferring electric power; And, it is characterized in that to the load supply capability of said current-collecting device:

Said power transmission device comprises:

Power receiving section is transformed into direct voltage with the induced voltage of said secondary coil;

Load-modulate portion, from said current-collecting device when said power transmission device sends data, according to sending data, load is changed changeably,

Said power transmission device comprises:

Amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding;

The A/D translation circuit is used to carry out the A/D conversion of detected said amplitude information; And

Control circuit is used to control said power transmission device,

Said A/D translation circuit begun to pass through from the moment of utilizing the detected detection voltage of said amplitude detecting circuit to surpass the supposition assigned voltage during given conversion constantly, detect the A/D conversion of voltage, try to achieve the numerical data of baseline threshold voltage,

Said control circuit uses the numerical data of said baseline threshold voltage, and detection, the foreign matter that carries out the data that said current-collecting device sends through load-modulate detects and at least a in detecting of loading and unloading.

13. power transmission control device; Be arranged in the power transmission device in the non-contact power transmitting system; Said non-contact power transmitting system makes primary winding and secondary coil electromagnetic coupled, from said power transmission device to the current-collecting device transferring electric power, and to the load supply capability of said current-collecting device; Said power transmission control device is characterised in that, comprising:

Amplitude detecting circuit is used to detect the amplitude information of the induced voltage signal of said primary winding;

The A/D translation circuit is used to carry out the A/D conversion of said amplitude information; And control circuit, be used to control said power transmission device,

Said A/D translation circuit is from utilizing after the detected detection voltage of said amplitude detecting circuit surpasses the moment of preset voltage; Carry out the A/D conversion of said detection voltage; Try to achieve that the detection that is used to carry out the data that said current-collecting device sent, foreign matter detect, or the baseline threshold voltage of the detection of the loading and unloading of said power transmission device and said current-collecting device

Said control circuit is according to said baseline threshold voltage, carries out the detection of the data that said current-collecting device sent, said foreign matter detects and at least a in detecting of the loading and unloading of said power transmission device and said current-collecting device.

14. a power transmission device is characterized in that, comprising:

Power transmission control device according to claim 13; And

Send electric portion, generate alternating voltage, and supply with to said primary winding.

15. an electronic equipment is characterized in that: comprise power transmission device according to claim 14.

16. non-contact power transmitting system; Comprise power transmission device and current-collecting device; Through making primary winding and secondary coil electromagnetic coupled; To said current-collecting device transferring electric power, to the load supply capability of said current-collecting device, said non-contact power transmitting system is characterised in that from said power transmission device:

Said power transmission device is a power transmission device according to claim 14.

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