CN101677182B - Battery protector with internal resistance compensation - Google Patents
Battery protector with internal resistance compensation Download PDFInfo
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- CN101677182B CN101677182B CN2008102131488A CN200810213148A CN101677182B CN 101677182 B CN101677182 B CN 101677182B CN 2008102131488 A CN2008102131488 A CN 2008102131488A CN 200810213148 A CN200810213148 A CN 200810213148A CN 101677182 B CN101677182 B CN 101677182B
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- resistor
- battery
- comparator
- internal resistance
- input end
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Abstract
The invention provides a battery protector with internal resistance compensation. The battery protector comprises a logic circuit and delay circuit module, an over-charging comparator and an over-discharging comparator, wherein, the negative input end of the over-charging comparator is connected with a first reference signal, and the positive input end thereof is fed-in through a first detection signal provided by a battery; the over-charging comparator outputs a first output signal to the logic circuit and the delay circuit module on the basis of the signal comparison of the positive input end and the negative input end thereof, so as to turn on or turn off the transistor switch of a charging path; the positive input end of the over-discharging comparator is connected with a second reference signal, and the negative input end thereof is fed-in through the first detection signal; the over-discharging comparator outputs a second output signal to the logic circuit and the delay circuit module on the basis of the signal comparison of the positive input end and the negative input end thereof, so as to turn on or turn off the transistor switch of a discharging path; and the first reference signal is generated by a first adjustable-voltage generating circuit, whereas the second reference signal is generated by a second adjustable-voltage generating circuit.
Description
Technical field
The invention relates to a kind of battery protector,, save the charging required time and the more batteries of user service time is provided to reach particularly relevant for the battery protector of a kind of tool internal resistance of cell compensation.
Background technology
Battery all portable electron device power resources of can saying so, such as: mobile phone, notebook, PDA(Personal Digital Assistant), walkman or the like all depend on battery that electric power is provided.But battery is a kind of device of accumulating electric weight after all, when portable electronic devices uses with regard to the electric energy of consuming cells.When portable electron device was unlocked so that the time spent, battery electric power will continue to be consumed until this portable electronic devices and is closed or remaining electric energy when being not enough to drive this device, and portable electron device will be compelled to close.The represented meaning of the latter is that the electric power that is stored in the battery is lower than a critical value.Generally speaking, no matter consider with environmental protection, perhaps with long-time overall average cost thinking, the many modes that can take battery recharge of portable electron device replenish the electric energy that consumes originally return.
The good battery of one battery management formula can be repeated to charge hundreds of times usually, even reaches thousands of times.
Most popular on the market rechargeable battery will be Ni-H battery and lithium battery.The electric power that the latter stores is bigger, and memory effect is seldom only arranged during charging.Battery be recharged or when discharging usually can with battery protector or battery management system control with prevent that battery from being overcharged or the generation of discharge or overcurrent to prolong the useful life of battery, the detection that overcharges is to be higher than the first critical voltage V when detecting cell voltage
Det1The time, be to be lower than the second critical voltage V and cross the detection of putting when detecting cell voltage
Det2The time.
Please refer to the functional block diagram of cells known protector 10 internal circuits shown in Fig. 1 a and Fig. 1 b, overcharging comparator 50 and crossing among Fig. 1 a put comparator 55 respectively with the fixing default first critical voltage V
Det1, and the second critical voltage V
Det2The reference voltage of device as a comparison.Electric current is by pin V
DDInflow by the voltage grading resistor of resistor R 1 and R2 to pin V
SSAnd whether overcharge, or cross the foundation of putting with the terminal voltage of the cross-pressure on the resistor R 2 as battery.
Please refer to the battery shown in Fig. 1 c is just seeing through the control of a charger 20 and a battery protector 10 and battery is being charged.At this moment, the external transistor FET2 of a CO pin of battery protector 10 and continue to be held open detects cell voltage V up to battery protector 10
CellBe recharged and meet or exceed default critical voltage value V
Det1Just can close.In the case, V
CellRoughly equal or exceed V
Det1Also can continue unlatching if battery, then is external in the transistor FET1 of a DO pin of battery protector 10 to load discharge on the other hand, reach or be lower than one up to battery protector 10 and preset critical voltage V
Det2Just can close.
But, the measured cell voltage V that arrives
CellThe voltage V that may not necessarily truly reflect battery
BatChief reason is that battery often has resistance R in
BatThe magnitude of voltage that resistance is reflected in being somebody's turn to do is relevant with the electric current or the discharging current of charging, and is represented just like following equation:
V
cell＝V
bat+I1*R
bat
Typical battery internal resistance R
BatValue has more than the 100m Ω approximately.So when the electric current I of charging
1When being 1A, then as cell voltage V
BatActual value is 4.1V, the voltage V that is measured
CellBut be 4.2V.If when betiding discharge on the other hand, the cell voltage V that is measured
CellThen be 4.0V because this moment electric current I
1Be-1A.
Therefore, one as described above, battery protector 10 if the factor of the internal resistance of cell is not listed in one of the parameter of closing FET2 and/or FET1 with fixing default critical voltage V
Det1Or V
Det2For the critical point of charge or discharge just has the problem of battery charge deficiency (because of closing FET2 too early) or discharge excessive (closing FET1 excessively evening), above-mentioned problem is necessary to be revised.Therefore, battery protector 10 is an extending battery life, can be in two stages during charging 190,200, when second stage, charge, in order to avoid undercharge with the electric current that reduces gradually.And when discharge then closed FET1 in advance, and be excessive to prevent to discharge.
In view of this, a purpose of the present invention is the battery protection ic circuit of design one intelligent battery internal resistance compensation, have (1) one and extend the life of a cell to reach, and (2) more economizes the effect in charging interval.
Summary of the invention
The battery protector that the invention provides tool battery internal resistance compensation is to provide the control of battery charging and discharging.Battery protector comprises a logical circuit and Postponement module, and overcharges comparator and and cross and put comparator in first embodiment, the negative input end that overcharges comparator is connected in one first reference signal, overcharge the first detection signal feed-in that the positive input terminal of comparator is provided by battery, overcharge the comparison of comparator according to this positive input terminal and negative input end signal, output signal to this logical circuit and Postponement module and export first, use the transistor switch of closing or open charge path; Cross the positive input terminal of putting comparator and be connected in one second reference signal, cross put comparator negative input end by this first detection signal feed-in, cross and put the comparison of comparator according to this positive input terminal and negative input end signal, output signal to this logical circuit and Postponement module and export second, use a transistor switch of closing or open discharge path; First reference signal produces circuit by first variable voltage and is produced, this first variable voltage produces the transistorized internal resistance that circuit is connected with pin VM according to the internal resistance of cell and the adjustment of battery charge critical voltage is exported, and second reference signal has components identical and annexation by the generation of second variable voltage generation circuit and this first variable voltage generation circuit, but the discharge critical voltage is provided.
Battery protector has components identical but only produces circuit with first variable voltage among battery protector and this first embodiment in a second embodiment, but uses two component volt circuits to provide detection signal as overcharging comparator and the input signal of crossing the anode of putting comparator.
Have in addition in the battery protector voltage quasi position shift circuit, Temperature Detector, short circuit current detector, charging the overcurrent comparator, and the discharge the overcurrent comparator to reach the purpose of further protection battery.
Description of drawings
In conjunction with appended graphic, can understand the plurality of advantages of foregoing and the present invention by following detailed description easily, wherein:
Fig. 1 a is according to the designed battery protector of known technology, does not have the internal circuit functional block diagram of internal resistance compensation function.
Fig. 1 b is according to the designed battery protector of another embodiment of known technology, does not have the internal circuit functional block diagram of internal resistance compensation function.
Fig. 1 c when to be battery with charging charging with the annexation figure of typical each pin of battery protector.
Fig. 2 a is for having the internal circuit functional block diagram of internal resistance compensation function according to the designed battery protector of the first embodiment of the present invention.
Fig. 2 b is for having the internal circuit functional block diagram of internal resistance compensation function according to the designed battery protector of the second embodiment of the present invention.
But Fig. 3 a is according to first modulation of the present invention (adjustable) voltage generation circuit figure.
But Fig. 3 b is according to second modulation of the present invention (adjustable) voltage generation circuit figure.
Fig. 4 a when battery charged, through the control of conventional batteries protector down, cell voltage and time chart and charging current and time chart.
Fig. 4 b when battery charged, through battery protector control of the present invention down, cell voltage and time chart and charging current and time chart.
Fig. 4 c is when charging to battery, and through tradition and battery protector of the present invention control down, cell voltage and time chart and charging current and time chart coincide together with the schematic diagram of comparing difference.
Fig. 5 a when battery discharged, through battery protector control of the present invention down, cell voltage and time chart and charging current and time chart.
Fig. 5 b when battery discharged, through battery protector control of the present invention down, cell voltage and time chart and charging current and time chart.
Fig. 5 c is when discharging to battery, and through tradition and battery protector of the present invention control down, cell voltage and time chart and charging current and time chart coincide together with the schematic diagram of comparing difference.
Drawing reference numeral:
| 10,100 |
105 logical circuits and |
| 108 voltage quasi |
110 |
| 120 short circuit current detectors | The overcurrent comparator of 130 chargings |
| The overcurrent comparator of 140 |
160, the 170 adjustable variables living circuit of cutting down output |
| 50,150 |
165 first bleeder circuits |
| 55,155 put comparator excessively | 175 second bleeder circuits |
| 20 chargers | 190,191 phase I charging curves |
| 200,201 second stage charging curves | ? |
Embodiment
Cell voltage V as discussed previously, that battery protector 10 is measured
Cell, in fact because of the relation amount of making that the internal resistance of cell is arranged value and actual value difference that 100mV is arranged approximately, be 1 ampere with discharge or charging current.Be necessary when therefore, charger charges to battery to consider that the internal resistance problem is to carry out necessary compensation.
Battery protector can be measured electric current by the VM pin.Voltage V on the VM pin
VM=-I
1(charging current) * R
MOS(internal resistance of FET1 and FET2).The internal resistance value representative value of FET1 and FET2 is 25m Ω, is 50m Ω so the internal resistance of the internal resistance of FET1 and FET2 is added up.Therefore, if the V that gets of utilization then when the internal resistance of battery is 100m Ω
VMCan obtain the virtual voltage V of battery by the following relationship formula
Bat:
V
bat＝V
cell-0.1*I
1＝V
cell-2*(0.05*I
1)＝V
cell+2*V
VM
When describing with general formula:
V
bat＝V
cell+k*V
VM。Wherein the k=internal resistance of cell and FET1 and FET2 internal resistance and ratio.
Fig. 2 a, Fig. 2 b show the function block schematic diagram according to the previous described intelligent battery internal resistance compensation ability battery protector of the present invention 100 inside.Wherein the internal resistance of the battery of Fig. 2 a compensation is finished with two adjustable variables living circuit 160,170 of cutting down output, and the internal resistance of the battery of Fig. 2 b compensation is finished with an adjustable variable living circuit 170 of cutting down output.The block schematic diagram of Fig. 2 a and Fig. 2 b comprises jointly: logical circuit and delay circuit module 105, the overcurrent comparator 140 of the overcurrent comparator 130 of voltage position quasi displacement circuit 108, Temperature Detector 110, short circuit current detector 120, charging, discharge, overcharge comparator 150, cross and put a comparator 155 and a bleeder circuit 165 (or two bleeder circuits 165,175).
The overcurrent comparator 140 of the overcurrent comparator 130 of above-mentioned short circuit current detector 120, Temperature Detector 110, charging, discharge, overcharge comparator 150, reached the output of putting comparator 155 and all be connected in logical circuit and delay circuit module 105 and whether reach the predeterminated voltage value with input signal and make suitable response above-mentioned comparator.For example, when short circuit current detector 120 detected the short circuit current generation, logical circuit and delay circuit module 105 will stop the output of battery.When the overcurrent comparator 140 of discharge detected the overcurrent generation of discharge, logical circuit and delay circuit module 105 were exceeding a scheduled delay, drag down will make the DO pin behind the filtered noise, to close FET1.When the overcurrent that the overcurrent comparator 130 of charging detects charging took place, logical circuit and delay circuit module 105 will drag down CO pin current potential after with filtered noise exceeding a scheduled delay, to close FET2.
On the other hand, when the incident that overcharges takes place, overcharge comparator 150 and can make logical circuit and delay circuit module 105 close FET2.Cross when putting the incident generation, put comparator 155 excessively and can make logical circuit and delay circuit module 105 close FET1.
Among Fig. 2 a, the adjustable variable living circuit 170 of cutting down output provides the negative terminal that overcharges comparator 150 one input reference signal V
Det1aThe adjustable variable living circuit 160 of cutting down output provided the anode one input reference signal V put comparator 155 from crossing
Det2aThe input signal that overcharges comparator 150 is imported by positive input terminal.Cross put comparator 155 input signal import by negative input end.Above-mentioned both input signals of 150,155 are taken from the cross-pressure on the R2 resistor of first bleeder circuit 165.First bleeder circuit 165 is made up of resistor R 1 and R2 is series at protector 100 pin V
DDWith pin V
SSBetween.This two pin directly links to each other with two electrodes of battery, please refer to Fig. 1 a, Fig. 1 b and Fig. 1 c.
When input signal (cross-pressure on the R2 resistor) greater than the reference voltage V that overcharges comparator 150
Det1aThe time, a positive voltage signal will overcharge comparator 150 certainly and export to logical circuit and delay circuit module 105 to produce another signal to close external FET2.When input signal (cross-pressure on the R2 resistor) was lower than the reference voltage Vdet2a of putting comparator 155, another positive voltage signal will be put comparator 155 and exports to logical circuit and delay circuit module 105 to produce a signal to close external FET1 again by crossing.
The above-mentioned adjustable variable living circuit 170 of cutting down output please refer to the circuit diagram of Fig. 3 a, and operational amplifier OP170 is connected between output and the negative input end with a feedback resistance R8.The input signal of negative input end is taken from VM pin voltage VVM through a resistor R 7 feed-in negative input end again.The input signal of positive input terminal is taken from predetermined critical voltage Vdet1 and is input into positive input terminal again through resistor R 6.Positive input terminal is connected with a resistor R 5 in addition to earth terminal.At this, the resistance of resistor R 5, R6, R7, R8 is selected for use according to above-mentioned K value and is adjusted, and minimum for OP170 input impedance.The output of operational amplifier OP170 just can produce a reference voltage Vdet1a with the change in voltage of VM pin.Input voltage value=the V of positive input terminal
Det1* R5/ (R5+R6).When above-mentioned K value=2 are example, the desirable equal R of four resistors.Just can reach the reference voltage V that generation changes with the internal resistance of cell
Det1a
In like manner, the above-mentioned adjustable variable living circuit 160 of cutting down output please refer to the circuit diagram of Fig. 3 b, and operational amplifier OP160 comprises a feedback resistance R8 and is connected between output and the negative input end.The input signal of negative input end is taken from VM pin voltage V
VMThrough a resistor R 7 feed-in negative input end again, one as described above.The input signal of positive input terminal is taken from predetermined critical voltage V
Det1Be input into positive input terminal again through resistor R 6.Positive input terminal is connected with a resistor R 5 in addition to earth terminal.The output of operational amplifier OP160 just can produce a reference voltage V with the change in voltage of VM pin
Det2aAt this, resistor R 5, R6, R7, R8 select one for use as described above, select for use according to above-mentioned K value.
Another embodiment of the present invention please refer to Fig. 2 b.Overcharged with crossing based on battery and to put phenomenon and can not take place simultaneously, therefore if two component volt circuits by the suitable resistor of selecting for use, just can be so that be respectively applied for the reference voltage V that can change the bleeder circuit 175 of putting comparator 155
Det1aWith V
Det2aIdentical.For example, reference voltage all is with identical adjustable variable cut down output living circuit 170, i.e. V in the present embodiment
Det1aOvercharge the default critical voltage V of comparator 150
Det1(one battery one cell) is about 4.2V with single lithium battery core, yet crosses the default critical voltage V of putting comparator 155
Det2(one batteryone cell) is about 2.4V with single lithium battery core, and an obvious difference is arranged between the two.But, we can be adjusted by second bleeder circuit 175, with an embodiment, for example, work as V
Det1aDuring for 1.2V, we can select R1, R2, R3, R4 be respectively 2.5M Ω, 1M Ω, 1M Ω, and 1M Ω with reach only use one only demodulating voltage produce the purpose of circuit 170.
According to intelligent battery protector 100 of the present invention, in general charging modes (CC-CV pattern), it can make charging quicker.Schematic diagram that please comparison diagram 4a, Fig. 4 b.Fig. 4 a only uses 100 controls of traditional battery protector when showing with charging, in the time of at the beginning, charging current is charged (corresponding cell voltage-time relationship such as curve 190, this moment is for the CC pattern or be called constant current mode) to approaching default critical voltage V with definite value IA
Det180% value for example, point are just turned electric current down (corresponding cell voltage-time relationship such as curve 200 are the CV pattern at this moment, or are called constant voltage mode) after during p gradually.It needs the time of TC altogether.Fig. 4 b uses battery protector of the present invention to have internal resistance of cell compensation control when showing with charging, need TC---t1 altogether.In the time of at the beginning, charging current is charged (corresponding cell voltage-time relationship is the same with 190 as curve 191 slopes) to approaching default critical voltage V with definite value IA
Det1aFor example 85% when value, some p ' just turns electric current down (cell voltage-time relationship such as the curve 201 of correspondence) in the back, because of the compensating circuit effect makes V
Det1a＞V
Det1, make p ' point delay than the p point.Therefore, clearly, it is full that intelligent battery protector 100 of the present invention can make the battery constant-current charge time comparatively fast fill than length, long (because V of time phase I (curve 191vs.190)
Det1a＞V
Det1), make the second stage time (curve 201vs.200) obviously to shorten.Fig. 4 c then is the comparison diagram that the curve of Fig. 4 a and Fig. 4 b is put together.
Intelligent battery protector with battery internal resistance compensation of the present invention has following benefit:
(1) when charging, the intelligent battery protector with battery internal resistance compensation of the present invention can shorten the required time during identical charge condition.
When (2) discharging, the intelligent battery protector with battery internal resistance compensation of the present invention can make battery discharge time longer, and is unlikely the shortening battery life.
Though the present invention illustrates as above with preferred embodiments, so it is not only to terminate in the foregoing description in order to limit the present invention's spirit with the invention entity.So the modification of being done in not breaking away from spirit of the present invention and scope all should be included in the claim.
Claims (10)
1. the battery protector of tool battery internal resistance compensation, the pin V of the battery protector of battery internal resistance compensation
DDWith ground connection pin V
SSBe connected with the positive and negative electrode end of a battery, it is characterized in that described battery protector comprises at least:
One logical circuit and Postponement module;
One overcharges comparator, have a positive input terminal and a negative input end, the described negative input end that overcharges comparator is connected in one first reference signal, the first detection signal feed-in that the described positive input terminal that overcharges comparator is provided by described battery, the described comparator that overcharges is according to the described positive input terminal and the comparison that overcharges the negative input end signal of comparator that overcharges comparator, output signal to described logical circuit and Postponement module and export first, use one first switch of closing or open charge path;
One puts comparator excessively, have a positive input terminal and a negative input end, the positive input terminal that described mistake is put comparator is connected in one second reference signal, described mistake is put the negative input end of comparator by the described first detection signal feed-in, described mistake is put comparator is put comparator according to described mistake positive input terminal and the comparison of crossing the negative input end signal of putting comparator, output signal to described logical circuit and Postponement module and export second, use a second switch of closing or open discharge path;
Wherein said first reference signal produces circuit by first variable voltage and is produced, it is two input signals that described first variable voltage generation circuit comprises with the voltage signal of a pin VM of described battery protector and one first default critical voltage, and exports described first reference signal with the internal resistance of cell value and the described pin VM electric current variation of flowing through; And
Wherein said second reference signal produces circuit by second variable voltage and is produced; it is two input signals that described second variable voltage generation circuit comprises with the voltage signal of a pin VM of described battery protector and one second default critical voltage, and exports described second reference signal with the internal resistance of cell and the described pin VM electric current variation of flowing through.
2. the battery protector of tool battery internal resistance compensation as claimed in claim 1; it is characterized in that; described first detection signal is a cross-pressure of taking from one second resistor of one first voltage grading resistor, and described first voltage grading resistor is made up of one first resistor and described second resistor and is connected in described pin V
DDWith ground connection pin V
SSBetween.
3. the battery protector of tool battery internal resistance compensation as claimed in claim 1; it is characterized in that; described first variable voltage produces circuit and comprises one first operational amplifier; one the 5th resistor; one the 6th resistor; one the 7th resistor; one the 8th resistor; the negative feedback resistor that described the 8th resistor is described first operational amplifier; the negative input end input bias resistor that described the 7th resistor is described first operational amplifier; the positive input terminal input bias resistor that described the 5th resistor is described first operational amplifier, described the 6th resistor is connected between the positive input terminal and ground of described first operational amplifier.
4. the battery protector of tool battery internal resistance compensation as claimed in claim 3; it is characterized in that, described the 5th resistor, the 6th resistor, the 7th resistor be according to battery internal resistance value and described first switch and second switch internal resistance and ratio and select resistance value.
5. the battery protector of tool battery internal resistance compensation as claimed in claim 1 is characterized in that, described second variable voltage produces circuit to have and the identical circuit of first variable voltage generation circuit.
6. the battery protector of tool battery internal resistance compensation, the pin V of the battery protector of battery internal resistance compensation
DDWith ground connection pin V
SSBe connected with the positive and negative electrode end of a battery, it is characterized in that described battery protector comprises at least:
One logical circuit and Postponement module;
One overcharges comparator, have a positive input terminal and a negative input end, the described negative input end that overcharges comparator is connected in one first reference signal, first detection signal that the described positive input terminal that overcharges comparator is provided by described battery, the described comparator that overcharges is according to the described positive input terminal and the comparison that overcharges the negative input end signal of comparator that overcharges comparator, output signal to described logical circuit and Postponement module and export first, use one first switch of closing or open charge path;
One puts comparator excessively, have a positive input terminal and a negative input end, the positive input terminal that described mistake is put comparator is connected in described first reference signal, described mistake is put second detection signal that the negative input end of comparator is provided by described battery, described mistake is put comparator is put comparator according to described mistake positive input terminal and the comparison of crossing the negative input end signal of putting comparator, output signal to described logical circuit and Postponement module and export second, use a second switch of closing or open discharge path; And
Wherein said first reference signal produces circuit by first variable voltage and is produced; it is two input signals that described first variable voltage generation circuit comprises with the voltage signal of a pin VM of described battery protector and one first default critical voltage, and exports described first reference signal with the internal resistance of cell value and the described pin VM electric current variation of flowing through.
7. the battery protector of tool battery internal resistance compensation as claimed in claim 6; it is characterized in that; described first detection signal is a cross-pressure of taking from one second resistor of one first voltage grading resistor, and described first voltage grading resistor is made up of one first resistor and described second resistor and is connected in described pin V
DDWith ground connection pin V
SSBetween.
8. the battery protector of tool battery internal resistance compensation as claimed in claim 6; it is characterized in that; described second detection signal is a cross-pressure of taking from one the 4th resistor of one second voltage grading resistor, and described second voltage grading resistor is made up of one the 3rd resistor and described the 4th resistor and is connected in described pin V
DDWith ground connection pin V
SSBetween.
9. the battery protector of tool battery internal resistance compensation as claimed in claim 6; it is characterized in that; described first variable voltage produces circuit and comprises one first operational amplifier; one the 5th resistor; one the 6th resistor; one the 7th resistor; one the 8th resistor; the negative feedback resistor that described the 8th resistor is first operational amplifier; the negative input end input bias resistor that described the 7th resistor is first operational amplifier; the positive input terminal input bias resistor that described the 5th resistor is first operational amplifier, described the 6th resistor is connected between the positive input terminal and ground of described first operational amplifier.
10. the battery protector of tool battery internal resistance compensation as claimed in claim 9; it is characterized in that, described the 5th resistor, the 6th resistor, the 7th resistor according to battery internal resistance value and described first switch and second switch internal resistance and ratio and select resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102131488A CN101677182B (en) | 2008-09-18 | 2008-09-18 | Battery protector with internal resistance compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102131488A CN101677182B (en) | 2008-09-18 | 2008-09-18 | Battery protector with internal resistance compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101677182A CN101677182A (en) | 2010-03-24 |
| CN101677182B true CN101677182B (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102131488A Expired - Fee Related CN101677182B (en) | 2008-09-18 | 2008-09-18 | Battery protector with internal resistance compensation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5554919A (en) * | 1993-02-17 | 1996-09-10 | Nec Corporation | Charge/discharge circuit having a simple circuit for protecting a secondary cell from overcharging and overdischarging |
| US5789902A (en) * | 1996-02-22 | 1998-08-04 | Hitachi Metals, Ltd. | Bi-direction current control circuit for monitoring charge/discharge of a battery |
| CN1489252A (en) * | 2002-10-09 | 2004-04-14 | 圣能捷科技股份有限公司 | Intelligent lithium ion battery protection circtuit |
| CN1979992A (en) * | 2005-12-07 | 2007-06-13 | 比亚迪股份有限公司 | Charge-discharge protection circuit of secondary cell group |
-
2008
- 2008-09-18 CN CN2008102131488A patent/CN101677182B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5554919A (en) * | 1993-02-17 | 1996-09-10 | Nec Corporation | Charge/discharge circuit having a simple circuit for protecting a secondary cell from overcharging and overdischarging |
| US5789902A (en) * | 1996-02-22 | 1998-08-04 | Hitachi Metals, Ltd. | Bi-direction current control circuit for monitoring charge/discharge of a battery |
| CN1489252A (en) * | 2002-10-09 | 2004-04-14 | 圣能捷科技股份有限公司 | Intelligent lithium ion battery protection circtuit |
| CN1979992A (en) * | 2005-12-07 | 2007-06-13 | 比亚迪股份有限公司 | Charge-discharge protection circuit of secondary cell group |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101677182A (en) | 2010-03-24 |
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Granted publication date: 20111207 Termination date: 20210918 |