CN103633628A - Battery protective circuit - Google Patents
Battery protective circuit Download PDFInfo
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- CN103633628A CN103633628A CN201310598448.3A CN201310598448A CN103633628A CN 103633628 A CN103633628 A CN 103633628A CN 201310598448 A CN201310598448 A CN 201310598448A CN 103633628 A CN103633628 A CN 103633628A
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Abstract
The invention provides a battery protective circuit, comprising a battery protecting unit; the battery protecting unit comprises a first overcurrent comparer and a second overcurrent comparer; a first input end of the first overcurrent comparer is connected with a third detection end VM of the battery protecting unit; a second input end of the first overcurrent comparer is connected with a first discharging overcurrent protecting threshold value voltage; the output end of the first overcurrent comparer outputs a first comparing signal; a first input end of the second overcurrent comparer is connected with the third detection end VM of the battery protecting unit; the second input end of the second overcurrent comparer is connected with a second discharging overcurrent protecting threshold value voltage; an enabling end of the second overcurrent comparer is connected with the output end of the first overcurrent comparer; the output end of the second overcurrent comparer outputs a second comparing signal, wherein the first discharging overcurrent protecting threshold value voltage is smaller than the second discharging overcurrent protecting threshold value voltage. Compared with the prior art, the protective circuit has the advantage of reducing the power consumption of the battery protecting circuit when an electric cell loop is positioned in a non-discharging overcurrent state.
Description
[technical field]
The present invention relates to circuit design field, particularly a kind of battery protecting circuit of low-power consumption.
[background technology]
Battery protecting circuit is installed in battery conventionally, for example, at mobile phone cell inner, has a very little printed circuit board (PCB) (Printed Circuit Board is called for short PCB), and battery protecting circuit is just arranged on this printed circuit board (PCB).Battery protecting circuit is for battery is discharged and recharged to control, and its basic function comprises overvoltage charge protection, overvoltage discharge prevention, electric discharge overcurrent protection, charging overcurrent protection and short-circuit protection.
Please refer to shown in Fig. 1 its schematic diagram that is a kind of battery protecting circuit of the prior art.Described battery protecting circuit comprises battery protection chip (or claiming battery protection unit) 110 and switch combination circuit 120.
The first power end BP+ of described battery protecting circuit is connected with the positive pole of battery core BAT, and the second source end BP-of described battery protecting circuit is connected with the negative pole of battery core BAT by switch combination circuit 120.When load resistance (not shown) is connected between the first power end BP+ and second source end BP-, described battery core BAT is in discharge condition; When battery charger (not shown) is just being connected between the first power end BP+ and second source end BP-, described battery core BAT is in charged state.
Described switch combination circuit 120 comprises a NMOS(N-Channel Metal Oxide Semiconductor) transistor MN1 and the second nmos pass transistor MN2.Described the first source electrode of nmos pass transistor MN1 and the negative pole of described battery core BAT are connected, its drain electrode is connected with the drain electrode of described the second nmos pass transistor MN2, the source electrode of described the second nmos pass transistor MN2 is connected with described second source end BP-, and parasitism has diode (not shown) in nmos pass transistor MN1, in nmos pass transistor MN2, parasitism has diode (not shown).
Described battery protection unit 110 comprises three test sides (or being called link) and two control ends.Three test sides are respectively the first test side VCC, the second test side VSS and the 3rd test side VM, and two control ends are respectively charging control end COUT and control of discharge end DOUT.Wherein, the first test side VCC is connected with the positive pole of battery core BAT, the second test side VSS is connected with the negative pole of battery core BAT, the 3rd test side VM is connected with described second source end BP-, charging control end COUT is connected with the grid of nmos pass transistor MN2, and control of discharge end DOUT is connected with the grid of nmos pass transistor MN1.The voltage of described battery protection unit 110 based on the first test side VCC, the second test side VSS and the 3rd test side VM detects the charging and discharging circuit of battery core BAT; with by described charging control end COUT output charging control signal, by described control of discharge end DOUT, export discharge control signal.When detecting described battery core BAT, described battery protection unit 110 charges when abnormal, the charging control signal of its charging control end COUT output is low level (it is for forbidding charging control signal), nmos pass transistor MN2 is turn-offed, to cut off the charge circuit of battery core BAT, thereby realize, forbid charging; When detecting described battery core BAT, described battery protecting circuit 110 discharges when abnormal; the discharge control signal of its control of discharge end DOUT output is low level (it is for forbidding discharge control signal); nmos pass transistor MN1 is turn-offed, to cut off the discharge loop of battery core BAT, thereby realize, forbid electric discharge.
Please refer to shown in Fig. 2, it is battery protection unit in Fig. 1 partial circuit schematic diagram in the prior art.Described battery protection unit comprises the first overcurrent comparator C MP1, the second overcurrent comparator C MP2, short circuit comparator CMP3 and control circuit 112.
Described the first overcurrent comparator C MP1, the second overcurrent comparator C MP2 and short circuit comparator CMP3 are for detecting the discharging current in battery core BAT loop.Described the first overcurrent comparator C MP1 is by comparing voltage (it reflects discharging current) and its reflection first electric discharge overcurrent protection threshold current of the first electric discharge overcurrent protection threshold voltage VEDI1(of the 3rd test side VM) to export the first comparison signal EDI1, this first comparison signal EDI1 represents whether the discharging current in battery core BAT loop is greater than the first electric discharge overcurrent protection threshold current; Described the second overcurrent comparator C MP2 is by comparing voltage and its reflection second electric discharge overcurrent protection threshold current of the second electric discharge overcurrent protection threshold voltage VEDI2(of the 3rd test side VM) to export the second comparison signal EDI2, this second comparison signal EDI2 represents whether the discharging current in battery core BAT loop is greater than the second electric discharge overcurrent protection threshold current; Described short circuit comparator CMP3 is for comparing voltage and its reflection short-circuit protection threshold current of short-circuit protection threshold voltage VSC(of the 3rd test side VM) and export the 3rd comparison signal SC; the 3rd comparison signal SC represents whether the discharging current in battery core BAT loop is greater than short-circuit protection threshold current; wherein; VEDI1<VEDI2<VSC; can to discharging current, detect by the first overcurrent comparator C MP1, the second overcurrent comparator C MP2 and short circuit comparator CMP3 like this, to show stage by stage the overcurrent degree of discharging current.
Described control circuit 112 is based on described the first comparison signal EDI1, the second comparison signal EDI2 and discharge control signal is forbidden in the 3rd comparison signal SC output or allow discharge control signal to the control of discharge end DOUT of described battery protection unit 110; when discharge control signal is forbidden in described control circuit 112 outputs; it is controlled nmos pass transistor MN1 and turn-offs; to cut off the discharge loop of battery core BAT, thereby realize, forbid electric discharge.
It is to be noted; no matter whether the charging and discharging state in battery core BAT loop is abnormal; above-mentioned three comparison circuits are all always in running order, thus in battery core BAT loop when absence of discharge over-current state (being normal operating conditions), cause the power consumption of battery protecting circuit larger.Pay particular attention to time, within most time, battery protecting circuit is all in normal operating state, and now three comparison circuits are all constantly consuming energy.
Therefore, be necessary to provide a kind of improved technical scheme to overcome the problems referred to above.
[summary of the invention]
The object of the present invention is to provide a kind of battery protecting circuit, it can be in battery core BAT loop during in absence of discharge over-current state, reduces the power consumption of battery protecting circuit.
In order to address the above problem, the invention provides a kind of battery protecting circuit, it comprises battery protection unit, and described battery protection unit comprises the first test side, the second test side, the 3rd test side, charging control end and control of discharge end, and described the first test side is connected with the positive pole of battery core; Described the second test side is connected with the negative pole of described battery core; described the 3rd test side is connected with the second source end of described battery protecting circuit; the positive pole of described battery core is connected with the first power end of described battery protecting circuit; the voltage of described battery protection unit based on the first test side, the second test side and the 3rd test side detects the charging and discharging circuit of battery core; with when charging is abnormal; by described charging control end output, forbid charging control signal; when electric discharge is abnormal, by described control of discharge end output, forbid discharge control signal.Described battery protection unit also comprises the first overcurrent comparator and the second overcurrent comparator, described the first overcurrent comparator comprises first input end, the second input and output, its first input end is connected with described the 3rd test side, its second input is connected with the first electric discharge overcurrent protection threshold voltage, and its output is exported the first comparison signal; Described the second overcurrent comparator comprises first input end, the second input, Enable Pin and output, its first input end is connected with described the 3rd test side, its second input is connected with the second electric discharge overcurrent protection threshold voltage, its Enable Pin is connected with the output of described the first overcurrent comparator, and its output is exported the second comparison signal; Wherein, first electric discharge overcurrent protection threshold voltage < the second electric discharge overcurrent protection threshold voltage.
Further, when the voltage of described the first overcurrent comparator in described the 3rd test side is less than described the first electric discharge overcurrent protection threshold voltage, export non-the first abnormal comparison signal; When the voltage in described the 3rd test side is greater than described the first electric discharge overcurrent protection threshold voltage, the first comparison signal of output abnormality, described the second overcurrent comparator is when non-the first abnormal comparison signal of described the first overcurrent comparator output, in disable state, non-the second abnormal comparison signal of its output output; Described the second overcurrent comparator is when the first comparison signal of described the first overcurrent comparator output abnormality; in enabled state; if the voltage of described the 3rd test side is less than described the second electric discharge overcurrent protection threshold voltage; non-the second abnormal comparison signal of described the second overcurrent comparator output; if the voltage of described the 3rd test side is greater than described the second electric discharge overcurrent protection threshold voltage, the second comparison signal of described the second overcurrent comparator output abnormality.
Further; described battery protecting circuit also includes short circuit comparator; described short circuit comparator comprises first input end, the second input, Enable Pin and output; its first input end is connected with described the 3rd test side; its second input is connected with short-circuit protection threshold voltage, and its Enable Pin is connected with the output of described the second overcurrent comparator, its output output the 3rd comparison signal; wherein, the second electric discharge overcurrent protection threshold voltage < short-circuit protection threshold voltage.Described short circuit comparator is when non-the second abnormal comparison signal of described the second overcurrent comparator output, and in disable state, its output is exported non-abnormal short circuit comparison signal; Described short circuit comparator is when the second comparison signal of described the second overcurrent comparator output abnormality; in enabled state; if the voltage of described the 3rd test side is less than described short-circuit protection threshold voltage; the non-abnormal short circuit comparison signal of described short circuit comparator output; if the voltage of described the 3rd test side is greater than described short-circuit protection threshold voltage, described short circuit comparator output abnormality short circuit comparison signal.
Further; described battery protection unit also comprises control circuit, and described control circuit is forbidden discharge control signal or allowed discharge control signal to the control of discharge end of described battery protection unit based on the first comparison signal, the second comparison signal and the output of short circuit comparison signal.
Further, the normal phase input end that described first input end is comparator, the reverse input end that described the second input is comparator, non-abnormal comparison signal is low level, abnormal comparison signal is high level.
Further; described battery protecting circuit also comprises switch combination circuit; described switch combination circuit is connected between described battery core negative pole and second source end; described in its basis, forbid that charging control signal cuts off the charge circuit of described battery core, according to described, forbid that discharge control signal cuts off the discharge loop of described battery core.
Further, described switch combination circuit comprises the first nmos pass transistor and the second nmos pass transistor,
The source electrode of described the first nmos pass transistor is connected with the negative pole of described battery core, and its grid is connected with described control of discharge end, and its drain electrode is connected with the drain electrode of described the second nmos pass transistor; The grid of described the second nmos pass transistor is connected with described charging control end, and its source electrode is connected with described second source end.
Further, when discharge control signal is forbidden in described control circuit output, the first nmos pass transistor cut-off, to cut off the discharge loop of battery core.
Compared with prior art; battery protection unit in the present invention in battery protecting circuit comprises a plurality of overcurrent comparators; wherein; the voltage ratio of each overcurrent comparator using an electric discharge overcurrent protection threshold voltage as the VM end with reference to voltage and battery protection unit is with output comparison signal; and can increasing progressively according to the electric discharge overcurrent protection threshold voltage in each overcurrent comparator; open one by one each overcurrent comparator; and then during in absence of discharge over-current state, reduce the power consumption of battery protecting circuit in battery core BAT loop.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.Wherein:
Fig. 1 is the schematic diagram of a kind of battery protecting circuit of the prior art;
Fig. 2 is battery protection unit in Fig. 1 partial circuit schematic diagram in the prior art;
Fig. 3 is the circuit diagram of the present invention's battery protecting circuit in one embodiment;
Fig. 4 is battery protection unit in Fig. 3 partial circuit schematic diagram in one embodiment.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Alleged " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not all refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.Unless stated otherwise, the word that connection herein, the expression that is connected, joins are electrically connected all represents to be directly or indirectly electrical connected.
Please refer to shown in Fig. 3, it is the circuit diagram of the present invention's battery protecting circuit in one embodiment.Described battery protecting circuit comprises battery protection unit 210 and switch combination circuit 220.
The first power end BP+ of described battery protecting circuit is connected with the positive pole of battery core BAT, and the second source end BP-of described battery protecting circuit is connected with the negative pole of battery core BAT by switch combination circuit 220.
Described battery protection unit 210 comprises three test sides and two control ends, and three test sides are respectively the first test side VCC, the second test side VSS and the 3rd test side VM; Two control ends are respectively charging control end COUT and control of discharge end DOUT.Wherein, described the first test side VCC is connected with the positive pole of described battery core BAT; Described the second test side VSS is connected with the negative pole of described battery core BAT, and described the 3rd test side VM is connected with the second source end BP-of described battery protecting circuit.The voltage of described battery protection unit 210 based on the first test side VCC, the second test side VSS and the 3rd test side VM detects the charging and discharging circuit of battery core BAT; with when charging is abnormal; by described charging control end COUT output, forbid charging control signal; when electric discharge is abnormal, by described control of discharge end DOUT output, forbid discharge control signal.
Please refer to shown in Fig. 4, it is battery protection unit in Fig. 3 partial circuit schematic diagram in one embodiment.Described battery protection unit comprises the first overcurrent comparator C MP1, the second overcurrent comparator C MP2 ', short circuit comparator CMP3 ' and control circuit 412.
Described the first overcurrent comparator C MP1 comprises first input end, the second input and output EDI1, its first input end is connected with described the 3rd test side VM, its second input is connected with the first electric discharge overcurrent protection threshold voltage VEDI1, and its output EDI1 exports the first comparison signal; Described the second overcurrent comparator C MP2 ' comprises first input end, the second input, Enable Pin EN2 and output EDI2, its first input end is connected with described the 3rd test side VM, its second input is connected with the second electric discharge overcurrent protection threshold voltage VEDI2, its Enable Pin EN2 is connected with the output EDI1 of described the first overcurrent comparator C MP1, and its output EDI2 exports the second comparison signal; Described short circuit comparator CMP3 ' comprises first input end, the second input, Enable Pin EN3 and output SC; its first input end is connected with described the 3rd test side VM; its second input is connected with short-circuit protection threshold voltage VSC; its Enable Pin EN3 is connected with the output EDI2 of described the second overcurrent comparator C MP2 '; its output SC exports the 3rd comparison signal; wherein, VEDI1<VEDI2<VSC.
Described control circuit 412 is based on the first comparison signal EDI1, the second comparison signal EDI2 and discharge control signal is forbidden in short circuit comparison signal SC output or allow discharge control signal to the control of discharge end DOUT of described battery protection unit 210.
Below specifically introduce the first overcurrent comparator C MP1 in Fig. 4, the operation principle of the second overcurrent comparator C MP2 ', short circuit comparator CMP3 '.
Described the first overcurrent comparator C MP1 voltage (it reflects discharging current) and its reflection first electric discharge overcurrent protection threshold current of the first electric discharge overcurrent protection threshold voltage VEDI1(by the 3rd test side VM of more described battery protection unit 210) to export the first whether abnormal comparison signal EDI1.Described the first overcurrent comparator C MP1 is when the voltage of described the 3rd test side VM is less than described the first electric discharge overcurrent protection threshold voltage VEDI1, and it represents that discharging current is less than the first electric discharge overcurrent protection threshold current to export non-the first abnormal comparison signal EDI1(); When the voltage of described the 3rd test side VM is greater than described the first electric discharge overcurrent protection threshold voltage VEDI1, it represents that discharging current is greater than the first electric discharge overcurrent protection threshold current the first comparison signal EDI1(of output abnormality).
The first comparison signal EDI1 of described the first overcurrent comparator C MP1 output is as the enable signal of described the second overcurrent comparator C MP2 '.Described the second overcurrent comparator C MP2 ' is in disable state when non-the first abnormal comparison signal EDI1 of described the first overcurrent comparator C MP1 output, and its output is exported non-the second abnormal comparison signal (it represents that discharging current is less than the second electric discharge overcurrent protection threshold current); Described the second overcurrent comparator C MP2 ' is when the first comparison signal EDI1 of described the first overcurrent comparator C MP1 output abnormality; in enabled state; the second overcurrent comparator C MP2 ' is by relatively voltage and its reflection second electric discharge overcurrent protection threshold current of the second electric discharge overcurrent protection threshold voltage VEDI2(of the 3rd test side VM) to export the second whether abnormal comparison signal EDI2.When described the second overcurrent comparator C MP2 ' is during in enabled state, if when the voltage of described the 3rd test side VM is less than described the second electric discharge overcurrent protection threshold voltage VEDI2, it represents that discharging current is less than the second electric discharge overcurrent protection threshold current non-the second abnormal comparison signal EDI2(of its output; If when the voltage of described the 3rd test side VM is greater than described the second electric discharge overcurrent protection threshold voltage VEDI2, it represents that discharging current is greater than the second electric discharge overcurrent protection threshold current the second comparison signal EDI2(of its output abnormality).
The second comparison signal EDI2 of described the second overcurrent comparator C MP2 ' output is the enable signal of described short circuit comparator CMP3 '.Described short circuit comparator CMP3 ' is when described the second overcurrent comparator C MP2 ' exports non-the second abnormal comparison signal EDI2, in disable state, it represents that discharging current is less than short-circuit protection threshold current the non-abnormal short circuit comparison signal SC(of its output SC output); Described short circuit comparator CMP3 ' is when the second comparison signal EDI2 of described the second overcurrent comparator C MP2 ' output abnormality; in enabled state, described short circuit comparator CMP3 ' is by relatively voltage and its reflection short-circuit protection threshold current of short-circuit protection threshold voltage VSC(of the 3rd test side VM) to export the 3rd whether abnormal comparison signal SC.When described short circuit comparator CMP3 ' is during in enabled state, if the voltage of described the 3rd test side VM is less than described short-circuit protection threshold voltage VSC, described short circuit comparator CMP3 ' exports non-abnormal short circuit comparison signal SC(, and it represents that discharging current is less than short-circuit protection threshold current); When the voltage of described the 3rd test side VM is greater than described short-circuit protection threshold voltage VSC, the short circuit comparison signal of described short circuit comparator CMP3 ' output abnormality (it represents that discharging current is greater than short-circuit protection threshold current).
Above-mentioned abnormal comparison signal and non-abnormal relatively letter can be two kinds of logic states of a signal, and for example, described non-the first abnormal comparison signal EDI is low level, and the first abnormal comparison signal EDI1 is high level.
Next, by an embodiment, specifically introduce the course of work of the battery protection unit in Fig. 4.
In the present embodiment, the first input end of three comparators is all normal phase input end, and the second input of three comparators is all negative-phase input, and non-abnormal comparison signal is all low level, and abnormal comparison signal is all high level.
When VM<VEDI1, the output EDI1 output low level of described the first overcurrent comparator C MP1 (it represents that discharging current is less than the first electric discharge overcurrent protection threshold current), the second overcurrent comparator C MP2 ' described in this low level disable, this low level is cut off the internal current path of described the second overcurrent comparator C MP2 ', the second overcurrent comparator C MP2 ' is not worked, and drop-down its output EDI2 is low level (it represents that discharging current is less than the second electric discharge overcurrent protection threshold current); Short circuit comparator CMP3 ' described in the low level disable of described the second overcurrent comparator C MP2 ' output; this low level is cut off the internal current path of described short circuit comparator CMP3 '; short circuit comparator CMP3 ' is not worked, and drop-down its output SC is low level (it represents that discharging current is less than short-circuit protection threshold current).That is to say, when VM<VEDI1(is that battery core BAT is in absence of discharge over-current state) time, only the first overcurrent comparator C MP1 work, and the first overcurrent comparator C MP1, the second overcurrent comparator C MP2 ' work and short circuit comparator CMP3 ' be output low level.
Work as VEDI1<VM<VEDI2, described first this high level of overcurrent comparator C MP1 output high level (it represents that discharging current is greater than the first electric discharge overcurrent protection threshold current) enables described the second overcurrent comparator C MP2 ', described the second overcurrent comparator C MP2 ' work and its output EDI2 output low level (it represents that discharging current is less than the second electric discharge overcurrent protection threshold current); Short circuit comparator CMP3 ' described in the low level disable of described the second overcurrent comparator C MP2 ' output; this low level is cut off the internal current path of described short circuit comparator CMP3 '; short circuit comparator CMP3 ' is not worked, and drop-down its output SC is low level (it represents that discharging current is less than short-circuit protection threshold current).That is to say, when VEDI1<VM<VEDI2, the first overcurrent comparator C MP1 work and output high level, the second overcurrent comparator C MP2 ' work and output low level, short circuit comparator CMP3 ' does not work and output low level.
When VEDI2<VM<VSC, described the first overcurrent comparator C MP1 output high level, this high level enables described the second overcurrent comparator C MP2 ', described the second overcurrent comparator C MP2 ' work and its output EDI2 output high level (it represents that discharging current is greater than the second electric discharge overcurrent protection threshold current); The high level of described the second overcurrent comparator C MP2 ' output enables described short circuit comparator CMP3 ', described short circuit comparator CMP3 ' work and its output SC output low level (it represents that discharging current is less than short-circuit protection threshold current).That is to say, when VEDI2<VM<VSC, the first overcurrent comparator C MP1 work and output high level, the second overcurrent comparator C MP2 ' work and output high level, short circuit comparator CMP3 ' work and output low level.
When VM>VSC, the first overcurrent comparator C MP1, the second overcurrent comparator C MP2 ' work, and short circuit comparator CMP3 ' works, and all export high level.
Described control circuit 412 is for example greater than the first guard delay time T 1(at described the first overcurrent comparator C MP1 output high level and duration, and in the time of 100ms), discharge control signal (it also can be described as discharge prevention signal) is forbidden in output; Or at described the second overcurrent comparator C MP2 ' output high level and duration, be for example greater than the second guard delay time T 2(, in the time of 12ms), discharge control signal is forbidden in output; Or be greater than for example 2～80 μ s of short-circuit protection T3(time of delay at described short circuit comparator CMP3 ' output high level time and duration) time output forbid discharge control signal.Like this, described control circuit 112 can be according to the overcurrent degree output discharge prevention signal of discharging current to cut off the discharge loop of described battery core BAT in time.
In another embodiment, the first input end of three comparators can be also all inverting input, and the second input of three comparators can be also all normal phase input end, and non-abnormal comparison signal is all high level, and abnormal comparison signal is all low level.When the comparison signal that the Enable Pin of comparator receives is high level, in disable state; When the comparison signal that the Enable Pin of comparator receives is low level, in enabled state.
More than describing is that the battery protection unit of take in the present invention comprises that three overcurrent comparators are example, easily full of beard and be, battery protection unit in the present invention can be two, four or more overcurrent comparator, its operation principle is identical with the operation principle of battery protection unit in the present invention who above introduces, be that in the present invention, battery protection unit comprises a plurality of overcurrent comparators, wherein, each overcurrent comparator is usingd an electric discharge overcurrent protection threshold voltage and is compared to export comparison signal as the voltage of the 3rd test side VM with reference in voltage and described battery protection unit, and according to increasing progressively of the electric discharge overcurrent protection threshold voltage in each overcurrent comparator, a plurality of overcurrent comparators are carried out to classification, the Enable Pin of the overcurrent comparator that the output of the overcurrent comparator that electric discharge overcurrent protection threshold voltage in adjacent two-stage overcurrent comparator is low is high with electric discharge overcurrent protection threshold voltage is connected, thereby can increasing progressively according to the electric discharge overcurrent protection threshold voltage in each overcurrent comparator, open step by step each overcurrent comparator, and then in battery core BAT loop during in absence of discharge over-current state, reduce the power consumption of battery protecting circuit.
Continuation is with reference to shown in figure 3, and described switch combination circuit 220 is connected between the negative pole and second source end BP-of described battery core BAT, its according to described in forbid the charge circuit that charging control signal (being charge protection signal) cuts off described battery core BAT; Described in described switch combination circuit 220 bases, forbid the discharge loop that discharge control signal (being discharge prevention signal) cuts off described battery core BAT.
Described switch combination circuit 220 can adopt general switch combination in relevant battery charging and discharging path of the prior art, and it has a lot of implementations, can choose at random, and does not do in the present invention particular determination.In the embodiment shown in fig. 3, described switch combination circuit 220 comprises the first nmos pass transistor MN1 and the second nmos pass transistor MN2.Described the first source electrode of nmos pass transistor MN1 and the negative pole of described battery core BAT are connected, and its grid is connected with described control of discharge end DOUT, and its drain electrode is connected with the drain electrode of described the second nmos pass transistor MN2; The grid of described the second nmos pass transistor MN2 is connected with described charging control end COUT, its source electrode is connected with described second source end BP-, and parasitism has diode (not shown) in nmos pass transistor MN1, in nmos pass transistor MN2, parasitism has diode (not shown).Described battery protection unit 210 can be realized battery core BAT is carried out to charge protection and discharge prevention by controlling the turn-on and turn-off of nmos pass transistor MN1, MN2.When normal condition, nmos pass transistor MN1, MN2 conducting is simultaneously controlled in described battery protection unit 210, now both chargeablely also can discharge.When charging generation is abnormal, nmos pass transistor MN2 cut-off is controlled in described battery protection unit 210, thereby has cut off charge circuit, but still can discharge.When electric discharge generation is abnormal, nmos pass transistor MN1 cut-off is controlled in described battery protection unit 110, thereby has cut off discharge loop, but still can charge.Wherein, if the described control circuit 112 in Fig. 4 is when based on the first comparison signal EDI1, the second comparison signal EDI2 and short circuit comparison signal SC, discharge control signal is forbidden in output to the control of discharge end DOUT of described battery protection unit 210; described nmos pass transistor MN1 cut-off, thereby the discharge loop that cuts off battery core BAT.
In the present invention, " connection ", be connected, word that the expression such as " company ", " connecing " is electrical connected, if no special instructions, represent direct or indirect electric connection.
It is pointed out that being familiar with any change that person skilled in art does the specific embodiment of the present invention does not all depart from the scope of claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to previous embodiment.
Claims (8)
1. a battery protecting circuit, it comprises battery protection unit, and described battery protection unit comprises the first test side, the second test side, the 3rd test side, charging control end and control of discharge end, and described the first test side is connected with the positive pole of battery core; Described the second test side is connected with the negative pole of described battery core; described the 3rd test side is connected with the second source end of described battery protecting circuit; the positive pole of described battery core is connected with the first power end of described battery protecting circuit; the voltage of described battery protection unit based on the first test side, the second test side and the 3rd test side detects the charging and discharging circuit of battery core; with when charging is abnormal; by described charging control end output, forbid charging control signal; when electric discharge is abnormal; by described control of discharge end output, forbid discharge control signal
It is characterized in that, described battery protection unit also comprises the first overcurrent comparator and the second overcurrent comparator,
Described the first overcurrent comparator comprises first input end, the second input and output, and its first input end is connected with described the 3rd test side, and its second input is connected with the first electric discharge overcurrent protection threshold voltage, and its output is exported the first comparison signal;
Described the second overcurrent comparator comprises first input end, the second input, Enable Pin and output, its first input end is connected with described the 3rd test side, its second input is connected with the second electric discharge overcurrent protection threshold voltage, its Enable Pin is connected with the output of described the first overcurrent comparator, and its output is exported the second comparison signal;
Wherein, first electric discharge overcurrent protection threshold voltage < the second electric discharge overcurrent protection threshold voltage.
2. battery protecting circuit according to claim 1, is characterized in that,
When the voltage of described the first overcurrent comparator in described the 3rd test side is less than described the first electric discharge overcurrent protection threshold voltage, export non-the first abnormal comparison signal; When the voltage in described the 3rd test side is greater than described the first electric discharge overcurrent protection threshold voltage, the first comparison signal of output abnormality,
Described the second overcurrent comparator is when non-the first abnormal comparison signal of described the first overcurrent comparator output, and in disable state, its output is exported non-the second abnormal comparison signal; Described the second overcurrent comparator is when the first comparison signal of described the first overcurrent comparator output abnormality; in enabled state; if the voltage of described the 3rd test side is less than described the second electric discharge overcurrent protection threshold voltage; non-the second abnormal comparison signal of described the second overcurrent comparator output; if the voltage of described the 3rd test side is greater than described the second electric discharge overcurrent protection threshold voltage, the second comparison signal of described the second overcurrent comparator output abnormality.
3. battery protecting circuit according to claim 2, is characterized in that, it also includes short circuit comparator,
Described short circuit comparator comprises first input end, the second input, Enable Pin and output; its first input end is connected with described the 3rd test side; its second input is connected with short-circuit protection threshold voltage; its Enable Pin is connected with the output of described the second overcurrent comparator; its output output the 3rd comparison signal
Wherein, the second electric discharge overcurrent protection threshold voltage < short-circuit protection threshold voltage,
Described short circuit comparator is when non-the second abnormal comparison signal of described the second overcurrent comparator output, and in disable state, its output is exported non-abnormal short circuit comparison signal; Described short circuit comparator is when the second comparison signal of described the second overcurrent comparator output abnormality; in enabled state; if the voltage of described the 3rd test side is less than described short-circuit protection threshold voltage; the non-abnormal short circuit comparison signal of described short circuit comparator output; if the voltage of described the 3rd test side is greater than described short-circuit protection threshold voltage, described short circuit comparator output abnormality short circuit comparison signal.
4. battery protecting circuit according to claim 3, is characterized in that, described battery protection unit also comprises control circuit,
Described control circuit is forbidden discharge control signal or is allowed discharge control signal to the control of discharge end of described battery protection unit based on the first comparison signal, the second comparison signal and the output of short circuit comparison signal.
5. battery protecting circuit according to claim 3, is characterized in that,
Described first input end is the normal phase input end of comparator, the reverse input end that described the second input is comparator, and non-abnormal comparison signal is low level, abnormal comparison signal is high level.
6. battery protecting circuit according to claim 4, is characterized in that,
It also comprises switch combination circuit, described switch combination circuit is connected between described battery core negative pole and second source end, described in its basis, forbid that charging control signal cuts off the charge circuit of described battery core, according to described, forbid that discharge control signal cuts off the discharge loop of described battery core.
7. battery protecting circuit according to claim 6, is characterized in that,
Described switch combination circuit comprises the first nmos pass transistor and the second nmos pass transistor,
The source electrode of described the first nmos pass transistor is connected with the negative pole of described battery core, and its grid is connected with described control of discharge end, and its drain electrode is connected with the drain electrode of described the second nmos pass transistor;
The grid of described the second nmos pass transistor is connected with described charging control end, and its source electrode is connected with described second source end.
8. battery protecting circuit according to claim 7, is characterized in that, when discharge control signal is forbidden in described control circuit output, the first nmos pass transistor cut-off, to cut off the discharge loop of battery core.
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| CN103633628B (en) | 2016-06-15 |
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