CN104899636A - Power supply management device applied to RFID reader full chip and method thereof - Google Patents
Power supply management device applied to RFID reader full chip and method thereof Download PDFInfo
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- CN104899636A CN104899636A CN201510240016.4A CN201510240016A CN104899636A CN 104899636 A CN104899636 A CN 104899636A CN 201510240016 A CN201510240016 A CN 201510240016A CN 104899636 A CN104899636 A CN 104899636A
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- power tube
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- power supply
- rfid reader
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Abstract
The embodiment of the invention discloses a power supply management device applied to an RFID reader full chip and a method thereof. The device comprises an operational amplifier module for receiving a reference voltage and a feedback sampling signal outputted by a power tube module, comparing the reference voltage and the feedback sampling signal, and sending the analog signal outputted by the comparison to an analog to digital conversion module, the analog to digital conversion module which is used for receiving the analog signal sent by the operational amplifier module, carrying out analog to digital conversion on the analog signal, and obtaining a digitized feedback sampling signal, a digital control module which is used for controlling a power tube to start and close a corresponding branch orderly according to the feedback sampling signal, and a power tube module used for orderly start and close the corresponding branch. According to the implementation of the embodiment of the invention, the provision of an addition pin for multiple-voltage-domain isolated power supply is not needed, the multiple-voltage-domain power supply can be realized in the chip of an RFID reader, and the introduction of ambient noise is avoided.
Description
Technical field
The present invention relates to radio-frequency (RF) identification (Radio Frequency Identification, RFID) reader technical field of power management, especially relate to a kind of power supply management device and the method that are applied to the full chip of RFID reader.
Background technology
RFID technique is a kind of contactless automatic identification technology, and it is by electromagnetic wave or inductance misfortune conjunction mode transmission of signal, to complete the automatic identification to destination object.Wireless signal is the electromagnetic field by furnishing radio frequency, and data are sent out from the label be attached to article, with automatic Identification and these article of tracking.The elect magnetic field that some label sends from recognizer when identifying just can obtain energy, does not need battery; Also there is label itself to have power supply, and initiatively can send radiowave (electromagnetic field of furnishing radio frequency).Label contains the information of Electronic saving, can identify within several meters.With bar code unlike, radio-frequency (RF) tag does not need to be within recognizer sight line, can embed within tracked object yet.
A basic radio-frequency recognition system comprises reader and transponder (also claiming electronic tag) two parts, and the basic thought of REID is: the radiofrequency signal of being launched certain frequency by reader, realizes each type objects or the automatic identification of equipment (personnel, article) under different conditions (mobile, static or rugged surroundings) to being attached with electronic tag.With bar code, magnetic card, contact integrated circuit card (Integrated Circuit Card, IC-card) etc. other automatic identification technology compare, namely RFID technique have identifying need not manual intervention, can identify that multiple target, information storage are large, can work in the advantages such as various rugged surroundings simultaneously.Therefore, RFID technique has been widely used in the fields such as fixed capital management, production line automation, animal and vehicle identification, highway toll, gate control system, storage, commodity counterfeit prevention, airline baggage management, container management.
Reader, as the important component part of rfid system, has very large decisive action to the performance of whole system.Reader integrates simulation receiving end, radio-frequency transmissions end and digital baseband, has the feature of Digital Analog Hybrid Circuits.Therefore in order to meet the requirement of Low Power High Performance, need receiving end, digital baseband and radio-frequency transmissions end are powered respectively, avoid digital-to-analogue common voltage territory to cause signal disturbing and distortion.The outer pcb board level of usual employing sheet carries out chip communication signal filtering, voltage stabilizing, power supply.But easily introduce neighbourhood noise at the power-supply service of pcb board level, and need extra pin to power for the isolation of multiple voltage domain.Therefore need to realize multiple voltage supply at chip internal, available circuit cannot meet the demand of multiple voltage supply.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the invention provides a kind of power supply management device and the method that are applied to the full chip of RFID reader, do not need to provide extra pin to power for the isolation of multiple voltage domain, the power supply of multiple voltage domain can be realized in the chip of radio-frequency identification reader, and avoid introducing neighbourhood noise.
In order to solve the problem, the present invention proposes a kind of power supply management device being applied to the full chip of RFID reader, described device comprises:
Amplifier module, for the feedback sample signal receiving reference voltage and exported by power tube module, and compares with reference to voltage and feedback sample signal, the simulating signal comparing output is sent to analog-to-digital conversion module;
Analog-to-digital conversion module, for receiving the simulating signal that amplifier module sends, and carrying out analog to digital conversion by this simulating signal, obtaining digitized feedback sample signal;
Digital control module, for controlling the unlatching successively of power tube or closing respective branch according to described feedback sample signal;
Power tube module, for opening or close the power tube of respective branch successively.
Preferably, described power tube module comprises multiple power tube, the output terminal that drain electrode is in parallel, grid is connected to described digital control module of described power tube.
Preferably, the drain electrode output feedack sampled signal of described multiple power tube is to amplifier module, and output voltage Vout.
Preferably, described amplifier module is operational amplifier.
Preferably, described power tube is PMOS.
Correspondingly, the embodiment of the present invention also provides a kind of power supply management method being applied to the full chip of RFID reader, and described method comprises:
The feedback sample signal receiving reference voltage and exported by power tube, and compare with reference to voltage and feedback sample signal, outputting analog signal;
Described simulating signal is carried out analog to digital conversion, obtains digitized feedback sample signal;
Control the unlatching successively of power tube according to described feedback sample signal or close respective branch, and output voltage Vout.
In embodiments of the present invention, by feedback impedance network samples output voltage signal, and by this sampled signal compared with reference voltage, the simulating signal comparing output is carried out analog to digital conversion, the grid terminal number word control circuit of power tube is opened successively according to digitized feedback sample signal or closes the power tube of respective branch, and then realizes the stable quick response changed with load of output voltage.Do not need to provide extra pin to power for the isolation of multiple voltage domain, the power supply of multiple voltage domain can be realized in the chip of radio-frequency identification reader, and avoid introducing neighbourhood noise.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure composition schematic diagram being applied to the power supply management device of the full chip of RFID reader of the embodiment of the present invention;
Fig. 2 is the circuit composition schematic diagram of the power supply management device of the embodiment of the present invention;
Fig. 3 is the schematic flow sheet being applied to the power supply management method of the full chip of RFID reader of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the power supply management device being applied to the full chip of RFID reader of the embodiment of the present invention, and as shown in Figure 1, this device comprises:
Amplifier module 1, for the feedback sample signal receiving reference voltage and exported by power tube module, and compares with reference to voltage and feedback sample signal, the simulating signal comparing output is sent to analog-to-digital conversion module 2;
Analog-to-digital conversion module 2, for receiving the simulating signal that amplifier module 1 sends, and carrying out analog to digital conversion by this simulating signal, obtaining digitized feedback sample signal;
Digital control module 3, for controlling the unlatching successively of power tube or closing respective branch according to feedback sample signal;
Power tube module 4, for opening or close the power tube of respective branch successively.
The circuit that Fig. 2 shows this power supply management device is formed, and is described in detail to the power supply management device being applied to the full chip of RFID reader of the present invention below in conjunction with Fig. 2.
As shown in Figure 2, power tube module comprises multiple power tube, and this power tube is PMOS, the output terminal that drain electrode is in parallel, grid is connected to digital control module of power tube, the drain electrode output feedack sampled signal of multiple power tube is to amplifier module, and output voltage Vout.
Wherein, amplifier module is operational amplifier, and positive input terminal receives reference voltage Vref, and negative input end receives the feedback sample signal from power tube.
In embodiments of the present invention, based on numerical control linear voltage regulator (the Low Dropout Regulator that multichannel power tube controls, LDO) by feedback impedance network samples output voltage signal, and by this feedback sample signal compared with reference voltage (Vref), the simulating signal comparing output is carried out analog to digital conversion, the grid end digitizing control circuit of power tube opens successively according to digitized feedback sample signal or cuts out the power tube of respective branch, and then realizes the stable quick response changed with load of LDO output voltage.
Wherein, the output accuracy of numerical control LDO and ripple size by analog-to-digital precision and power tube branch road number decide, conversion figure place is higher, and the power tube branch road that digital-control circuit can control is more, and the output of LDO is more accurate.
Because the transient response of typical LDO is determined by its loop bandwidth, and the restriction of bandwidth sum loop bandwidth due to the operational amplifier in loop, make transient response slower.And there is not such restriction in the power supply management device of the embodiment of the present invention.Under certain D/A switch precision, the response of LDO is determined by the coding fine degree of digital-control circuit and the branch road quantity of power tube.
In addition, the embodiment of the present invention also provides a kind of power supply management method being applied to the full chip of RFID reader, and as shown in Figure 3, the method comprises:
S301, the feedback sample signal receiving reference voltage and exported by power tube, and compare with reference to voltage and feedback sample signal, outputting analog signal;
S302, carries out analog to digital conversion by simulating signal, obtains digitized feedback sample signal;
S303, controls the unlatching successively of power tube according to feedback sample signal or closes respective branch, and output voltage Vout.
In embodiments of the present invention, by feedback impedance network samples output voltage signal, and by this sampled signal compared with reference voltage, the simulating signal comparing output is carried out analog to digital conversion, the grid terminal number word control circuit of power tube is opened successively according to digitized feedback sample signal or closes the power tube of respective branch, and then realizes the stable quick response changed with load of output voltage.Do not need to provide extra pin to power for the isolation of multiple voltage domain, the power supply of multiple voltage domain can be realized in the chip of radio-frequency identification reader, and avoid introducing neighbourhood noise.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, storage medium can comprise: ROM (read-only memory) (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.
In addition, the power supply management device being applied to the full chip of RFID reader provided the embodiment of the present invention above and method are described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. be applied to a power supply management device for the full chip of RFID reader, it is characterized in that, described device comprises:
Amplifier module, for the feedback sample signal receiving reference voltage and exported by power tube module, and compares with reference to voltage and feedback sample signal, the simulating signal comparing output is sent to analog-to-digital conversion module;
Analog-to-digital conversion module, for receiving the simulating signal that amplifier module sends, and carrying out analog to digital conversion by this simulating signal, obtaining digitized feedback sample signal;
Digital control module, for controlling the unlatching successively of power tube or closing respective branch according to described feedback sample signal;
Power tube module, for opening or close the power tube of respective branch successively.
2. be applied to the power supply management device of the full chip of RFID reader as claimed in claim 1, it is characterized in that, described power tube module comprises multiple power tube, the output terminal that drain electrode is in parallel, grid is connected to described digital control module of described power tube.
3. be applied to the power supply management device of the full chip of RFID reader as claimed in claim 2, it is characterized in that, the drain electrode output feedack sampled signal of described multiple power tube is to amplifier module, and output voltage Vout.
4. be applied to the power supply management device of the full chip of RFID reader as claimed in claim 3, it is characterized in that, described amplifier module is operational amplifier.
5. be applied to the power supply management device of the full chip of RFID reader as claimed in claim 2 or claim 3, it is characterized in that, described power tube is PMOS.
6. be applied to a power supply management method for the full chip of RFID reader, it is characterized in that, described method comprises:
The feedback sample signal receiving reference voltage and exported by power tube, and compare with reference to voltage and feedback sample signal, outputting analog signal;
Described simulating signal is carried out analog to digital conversion, obtains digitized feedback sample signal;
Control the unlatching successively of power tube according to described feedback sample signal or close respective branch, and output voltage Vout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240016.4A CN104899636A (en) | 2015-05-12 | 2015-05-12 | Power supply management device applied to RFID reader full chip and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240016.4A CN104899636A (en) | 2015-05-12 | 2015-05-12 | Power supply management device applied to RFID reader full chip and method thereof |
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| CN104899636A true CN104899636A (en) | 2015-09-09 |
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| CN201510240016.4A Pending CN104899636A (en) | 2015-05-12 | 2015-05-12 | Power supply management device applied to RFID reader full chip and method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060208716A1 (en) * | 2005-03-18 | 2006-09-21 | Power-One Limited | Digital output voltage regulation circuit having first control loop for high speed and second control loop for high accuracy |
| US20090128114A1 (en) * | 2005-06-30 | 2009-05-21 | Power Integrations, Inc. | Power supply output voltage trimming |
| CN203217613U (en) * | 2013-04-19 | 2013-09-25 | 浙江师范大学 | UHF RFID passive label chip power supply circuit |
-
2015
- 2015-05-12 CN CN201510240016.4A patent/CN104899636A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060208716A1 (en) * | 2005-03-18 | 2006-09-21 | Power-One Limited | Digital output voltage regulation circuit having first control loop for high speed and second control loop for high accuracy |
| US20090128114A1 (en) * | 2005-06-30 | 2009-05-21 | Power Integrations, Inc. | Power supply output voltage trimming |
| CN203217613U (en) * | 2013-04-19 | 2013-09-25 | 浙江师范大学 | UHF RFID passive label chip power supply circuit |
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Application publication date: 20150909 |