CN102904219A - Lithium battery charging and discharging protective circuit - Google Patents
Lithium battery charging and discharging protective circuit Download PDFInfo
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- CN102904219A CN102904219A CN2012103494292A CN201210349429A CN102904219A CN 102904219 A CN102904219 A CN 102904219A CN 2012103494292 A CN2012103494292 A CN 2012103494292A CN 201210349429 A CN201210349429 A CN 201210349429A CN 102904219 A CN102904219 A CN 102904219A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 112
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 230000001681 protective effect Effects 0.000 title claims abstract description 35
- 238000007599 discharging Methods 0.000 title abstract description 7
- 150000002641 lithium Chemical class 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The invention provides a lithium battery charging and discharging protective circuit which can restrain deep discharging and is provided with a switch circuit, a comparison circuit, a latch circuit and a latch control circuit, wherein the switch circuit is used for performing switching control on discharging of a lithium battery; the comparison circuit judges whether the positive voltage is a working state voltage or a non-working state voltage and outputs a judge signal; the latch circuit receives the judge signal, outputs a connection output signal which enables the switch circuit to be in a connected state when the judge signal is displayed to be in the working state and outputs a disconnection output signal which enables the switch circuit to be in a disconnected state when the judge signal displays that the positive voltage is a non-working state voltage; and the latch control circuit controls the latch circuit to lock the disconnection output signal when the latch circuit outputs the disconnection output signal and controls the latch circuit to unlock locking state of the disconnection output signal to enable the switch circuit to be in a connected state when charging between a charging power source and the lithium battery is performed and the positive voltage rises to the working state voltage.
Description
Technical field
The present invention relates to a kind of lithium battery charge and discharge protective loop.
Background technology
Lithium battery is as a kind of conventional batteries, has a power supply capacity high, the advantage such as power quality is light, thus extensively be applied in the portable mobile devices such as mobile phone, video player, audio player.But; lithium battery overcharging in discharging and recharging formation, overdischarge, discharge over-current, charge over-current, short circuit all can have influence on the useful life of lithium battery; thereby in safe design, need to install the charge and discharge protecting loop additional to lithium battery, with prevent lithium battery overcharge, overdischarge, discharge over-current, charge over-current, short circuit cause the potential danger such as excess Temperature, burning even blast.
Fig. 4 is the circuit diagram in former lithium battery charge and discharge protective loop.Fig. 5 is the analog simulation figure in former lithium battery charge and discharge protective loop.Shown in Fig. 4,5, in this lithium battery charge and discharge protective loop 1, because the chemical characteristic of lithium battery self, the common discharge condition of lithium battery is 2.5V--4.3V, and the over-discharge state threshold value is 2.5V.Standby threshold is 1.0V.Be V-less than 1V, standby output L; V-is greater than 1V, and H is exported in standby, VSS voltage is taken as be 0V.
When the voltage of lithium battery 10 was in 2.5V--4.3V, because the lithium battery powering load, its voltage constantly descended.VD2 comparator output electronegative potential, VD2_latch also exports electronegative potential, discharge MOSFET2 conducting.
After cell voltage was less than or equal to 2.5V, the output of VD2 comparator became high potential, and VD2_latch also becomes high potential after the time-delay, and discharge MOSFET2 closes.
At this moment, voltage V-begins to raise, and cell voltage is ging up.The speed that voltage V-raises is determined by the electric capacity of load, when load contains large electric capacity greater than 4700uF, cell voltage go back up to 2.5V above before, V-voltage also can't reach and rise to 1.0V when above, VD2_latch can be reset to electronegative potential by its end (reset) of resetting.The MOSFET2 that namely discharges meeting conducting, battery can discharge to load again.Until cell voltage drops to after the 2.5V again, will repeat above-mentioned state, thereby cause that discharge MOSFET2 produces the phenomenon of vibration, until the lithium battery degree of depth there is not electricity.
Degree of depth overdischarge meeting makes the chemical material of lithium battery itself produce irreversible damage, thereby has reduced battery capacity and life-span.In addition, the frequent switch of over MOSFET may also can cause damage to load.
The object of the present invention is to provide a kind of lithium battery charge and discharge protective loop; when even load contains large electric capacity (greater than 4700uF); also not can so that the over condition subsequent by false triggering; thereby not only realized the protection to over-charge of lithium battery electricity, overdischarge, discharge over-current, charge over-current, short circuit, guaranteed that also battery is not by deep discharge.
Summary of the invention
The inventor has adopted following structure in order to address the above problem.
The present invention relates to a kind of lithium battery charge and discharge protective loop, in the process that charge power supply is charged to lithium battery and this lithium battery discharges to load, lithium battery is protected, and be connected respectively with negative pole end with the positive terminal of this lithium battery.
This lithium battery charge and discharge protective loop has: the switch loop is connected between negative pole end and the load switch control is carried out in the discharge of lithium battery; Comparison loop is accepted cathode voltage from positive terminal, judges that based on reference voltage this cathode voltage is operating state voltage or non operating state voltage and exports one and judge signal; Latch the loop, accept to judge signal, when judging that signal is shown as operating state, export one so that the switch loop is in the output signal of opening of opening state, when judging that in a single day signal shows that cathode voltage is non operating state voltage, export one so that the switch loop is in the output signal of closing of closed condition; And latch control loop, when latching loop output when closing output signal, control is latched the loop locking and is closed output signal, when beginning to charge between charge power supply and the lithium battery and cathode voltage when rising to operating state voltage, control is latched the loop and is removed and describedly close the lock-out state of output signal so that the switch loop is in opening state.
Invention effect and effect
Lithium battery charge and discharge protective provided by the invention loop has been adopted and has been latched control loop and latching loop output when closing output signal; control is latched the loop and is locked this and close output signal; when beginning to charge between charge power supply and the lithium battery and cathode voltage when rising to operating state voltage; control is latched the loop releasing and is closed the lock-out state of output signal so that the switch loop is in opening state; thereby not only realized whether having large electric capacity in the no matter load; it is to the over-charge of lithium battery electricity; overdischarge; discharge over-current; charge over-current; the protection of short circuit has guaranteed that also battery is not by deep discharge.
Description of drawings
Fig. 1 is the structural representation in the present invention lithium battery charge and discharge protective loop in an embodiment;
Fig. 2 is the circuit diagram in the present invention lithium battery charge and discharge protective loop in an embodiment;
Fig. 3 is the analogue simulation schematic diagram in the present invention lithium battery charge and discharge protective loop in an embodiment;
Fig. 4 is the circuit diagram in former lithium battery charge and discharge protective loop;
Fig. 5 is the analogue simulation schematic diagram in former lithium battery charge and discharge protective loop.
Embodiment
The present invention relates to a kind of lithium battery charge and discharge protective loop, in the process that charge power supply is charged to lithium battery and this lithium battery discharges to load, lithium battery is protected, and be connected respectively with negative pole end with the positive terminal of this lithium battery.
This lithium battery charge and discharge protective loop can have the switch loop in embodiment, be connected between negative pole end and the load switch control is carried out in the discharge of lithium battery; Comparison loop is accepted cathode voltage from positive terminal, judges that based on reference voltage this cathode voltage is operating state voltage or non operating state voltage and exports one and judge signal; Latch the loop, accept to judge signal, when judging that signal is shown as operating state, export one so that the switch loop is in the output signal of opening of opening state, when judging that in a single day signal shows that cathode voltage is non operating state voltage, export one so that the switch loop is in the output signal of closing of closed condition; And latch control loop, when latching loop output when closing output signal, control is latched the loop locking and is closed output signal, when beginning to charge between charge power supply and the lithium battery and cathode voltage when rising to operating state voltage, control is latched the loop and is removed and describedly close the lock-out state of output signal so that the switch loop is in opening state.
As a kind of example; a MOSFET and a not gate are contained in the switch loop in lithium battery charge and discharge protective provided by the invention loop; this not gate is accepted to open output signal or close output signal and export a non-gate signal to the grid of MOSFET; the source electrode of MOSFET is connected with negative pole end; the drain electrode of MOSFET connects to load
Its comparison loop contains a voltage divider as the first voltage divider, a comparator is as the first comparator, described the first voltage divider is accepted the cathode voltage of described cathode voltage and described negative pole end and is exported first branch pressure voltage, described the first comparator is accepted described the first reference voltage and the first branch pressure voltage and output and is judged signal
It latchs the loop and contains a latch, and this latch has one end and the end of resetting are set, and termination is set is judged signal, resets to hold to connect and latchs control loop;
It latchs control loop and contains a voltage divider as the second voltage divider, a comparator is as the second comparator, a not gate, and a NOR gate, the second voltage divider is accepted second reference voltage and is accepted cathode voltage from negative pole end, and exports second branch pressure voltage; Described the second comparator is accepted the 3rd reference voltage and second branch pressure voltage and is exported second comparison output signal; Not gate is accepted not gate output signal of the second comparison output signal output; NOR gate is accepted to judge signal and not gate output signal and is exported a locking/ring off signal to the replacement end that latchs in the loop.
In this embodiment, the first reference voltage is about 1V, the second reference voltage is about 0.6V, the 3rd reference voltage is about 0V, the normal phase input end of the first comparator is accepted the first reference voltage, the negative-phase input of the first comparator is accepted the first branch pressure voltage, operating state voltage is set to 2.5～4.3V, when cathode voltage is operating state voltage, the judgement signal is electronegative potential, and it is electronegative potential that output signal is opened in latch output, is in conducting state thereby MOSFET accepts a high potential at grid, cathode voltage is about 0V, the second branch pressure voltage is about 0.3V, and the normal phase input end of the second comparator is accepted the 3rd reference voltage, and the negative-phase input of the second comparator is accepted the second branch pressure voltage, the second comparison output signal is electronegative potential, and locking/ring off signal also is electronegative potential.
When cathode voltage is non operating state voltage less than 2.5V, the judgement signal is high potential, it is high potential that output signal is closed in latch output, thereby MOSFET accepts an electronegative potential at grid is in closed condition, NOR gate accepts the judgement signal of high potential so that locking/ring off signal is electronegative potential, thereby so that the output signal of closing of latch is locked in high potential.
When described charge power supply begins to charge to lithium battery, when cathode voltage rises to operating state voltage, cathode voltage is about-0.3～-0.6V, the second branch pressure voltage is about-0.1V, the second comparison output signal is high potential, the not gate output signal is low-voltage, judge that signal changes electronegative potential into by high potential, locking/ring off signal is that high potential opens output signal so that latch output electronegative potential becomes for the replacement end that latchs in the loop, thereby thereby becomes conducting state so that MOSFET accepts a high potential at grid.
In this embodiment, the first reference voltage is the overdischarge threshold voltage.
Below in conjunction with accompanying drawing lithium battery charge and discharge protective provided by the invention loop is described in detail.
Fig. 1 is the structural representation in the lithium battery charge and discharge protective loop in the present embodiment.As shown in Figure 1, the lithium battery charge and discharge protective loop 100 in the present embodiment is to improve on the basis of original charge circuit to form, and has switch loop 110, comparison loop 120, latchs loop 130, latchs control loop 140.This lithium battery charge and discharge protective loop 100 is connected respectively with negative pole end VSS with the positive terminal VDD of this lithium battery 10, and in the process that the charge power supply (not shown) is charged to lithium battery 10 and 10 pairs of loads 20 of this lithium battery are discharged this lithium battery 10 is protected.
Wherein, switch loop 110 is connected between the negative pole end and load of lithium battery 10, and its function is switch control is carried out in the discharge of lithium battery 10.
Latch loop 130 and accept to judge signal, thereby when judging that signal is shown as operating state, export one so that switch loop 110 is in the output signal of opening of opening state; When judging that in a single day signal shows that cathode voltage is non operating state voltage, export one so that the switch loop is in the output signal of closing of closed condition.
Fig. 2 is the circuit diagram in the lithium battery charge and discharge protective loop 100 in the present embodiment.As shown in Figure 2, have the function of the discharge of lithium battery 10 being carried out switch control in order to realize switch loop 110, its structure contains a MOSFET and a not gate 111 in forming.Not gate 111 accepts to latch that loop 130 exports opens output signal or close output signal and export a non-gate signal to the grid of MOSFET.The source electrode of MOSFET is connected with the negative pole end of lithium battery 10, and the drain electrode of MOSFET connects to load 20, thus the state that MOSFET is in conducting or closes according to non-gate signal.
Contain 121, one comparators of a voltage divider (VD2) 122 in the comparison loop 120, voltage divider 121 is made of resistance R 1 and resistance R 2.
One end of resistance R 1 connects the positive terminal of lithium battery, the other end be connected with resistance R 2 an end and the negative-phase input of comparator 122.The other end of resistance R 2 connects the negative pole end of lithium battery 10.Thereby voltage divider 121 can be accepted the cathode voltage of cathode voltage and negative pole end and export a branch pressure voltage V1.
The normal phase input end of comparator 122 is accepted a reference voltage Vref 1 from a power supply U, thereby exports the judgement signal based on reference voltage Vref 1 and branch pressure voltage V1.
The normal phase input end of comparator 142 is accepted a reference voltage vref2, thereby so that comparator 142 is exported a comparison output signal according to reference voltage vref2 and branch pressure voltage V2.
The input of not gate 143 connects the output of comparator 142, and its output connects an input of NOR gate 144.Thereby not gate 143 is accepted the comparison output signal of comparator 142 outputs, thereby exports a not gate output signal.
Another link of NOR gate 144 is connected with the output of comparator 122, thereby NOR gate 144 is accepted the not gate output signal that judgement signal that comparison loop sends and not gate 143 are exported, and exports a locking signal or ring off signal to the replacement end that latchs in the loop 130.
Because this lithium battery charge and discharge protective loop 100 is to improve on the basis of charge circuit to obtain, thereby, the charge switch 112 that switch control is carried out in a charging to lithium battery also be provided with in the switch loop 110.Also be provided with a charging control loop 150 in the lithium battery charge and discharge protective loop 100.
This charging control loop 150 is made of Postponement module 151, NAND gate 152, not gate 153 and charge control module 154.One end of Postponement module 151 connects the output of comparator 142, and the other end connects an input of NAND gate 152.Another input of NAND gate 152 connects the output of comparator 142.The output of NAND gate 152 connects the input of not gate 153.The output of not gate 153 connects an input of charge control module.Charge control module also has an input to connect the output of comparator 122.The output of charge control module connects charge switch 112.
In the present embodiment, above-mentioned non operating state is holding state, and reference voltage Vref 1 is the overdischarge threshold voltage.
The normal phase input end of comparator 122 is accepted reference voltage Vref 1, and the negative-phase input of comparator 122 is accepted branch pressure voltage V1.
The operating state voltage of lithium battery is set to 2.5～4.3V, and when the cathode voltage of lithium battery was operating state voltage, the voltage of the negative-phase input of comparator 122 was greater than the voltage of its normal phase input end, thereby the judgement signal of its output is electronegative potential.Input to arranging of latch 134 behind this electronegative potential process NAND gate 132, the not gate 133 and hold an electronegative potential.
The Vref2 (being about 0) that the voltage V2 that the negative-phase input of comparator 142 receives receives greater than the normal phase input end of comparator 142, thereby the comparison output signal of the output of this comparator 142 output is electronegative potential, and this electronegative potential becomes high potential through behind the not gate 143.
At this moment, two inputs of NOR gate 144 receive respectively an electronegative potential and a high potential, thereby export an electronegative potential to the replacement end of latch.
Therefore latch 132 is exported as the electronegative potential of opening output signal.
The electronegative potential that latch 132 is exported is through the not gate 111 in the switch loop, and not gate 111 is exported a high potential.MOSFET is according to this high potential conducting, thereby so that lithium battery can be given load discharge.
When the cathode voltage of lithium battery 10 during less than 2.5V the state of lithium battery be non operating state voltage.At this moment, the positive input voltage of comparator 122 (approximately 1V) is greater than its negative input voltage V1, thereby comparator 122 outputs are as the high potential of closing output signal.Through exporting a high potential to the end that arranges of latch behind process NAND gate 132 and the not gate 133 after delay circuit 131 time-delays.Thereby the high potential of output signal is closed in conduct of latch 134 outputs.
And receiving high potential, an input of NOR gate 144 namely exports an electronegative potential to the replacement end of latch 134, thereby so that latch 134 locking output high potentials, MOSFET in the switching circuit accepts the electronegative potential of not gate 111 outputs and is in the state of closing, and 20 power supplies are cut off thereby lithium battery 10 is given load.
Give load 20 power supplies cut moment from lithium battery 10, because the characteristic of battery self, cell voltage bottom out, i.e. the voltage bottom out at V-place and all the time greater than zero among Fig. 2.Be the voltage of normal phase input end of comparator 142 all the time less than the voltage of its negative-phase input, thereby this comparator 142 can be exported an electronegative potential when lithium battery is in non operating state.This electronegative potential is through behind the not gate 143, and high potential of not gate 143 outputs is to an input of NOR gate 144.
This moment, thereby two inputs of NOR gate 144 all received the electronegative potential of a conduct of its output output of high potential signal locking/activation signal to the replacement end of latch 134, thereby under the non operating state of lithium battery, the signal that latch is exported is as high potential all the time, thereby MOSFET is in closed condition.That is, latch control loop 140 and latching loop 130 output when closing output signal, controlled and latched loop 130 lockings this closes output signal.
When lithium battery connects charger, be that lithium battery is in the state that is recharged, when lithium battery also is not charged to 2.5V, the voltage of the positive and negative terminal of charger is greater than cell voltage (about 0.3V～0.6V), namely this moment lithium battery the cathode voltage exported of negative pole end be about 0.3～-0.6V, and the voltage of V-is less than VSS-0.1V.
In this process that lithium battery 10 is recharged, the branch pressure voltage V2 that voltage divider 141 is exported is-0.1V, and the voltage of the normal phase input end of this voltage divider 141 is greater than the voltage of its negative-phase input, thereby the dividing potential drop output signal of voltage divider 141 outputs is high potential.
Thereby latch high potential of control loop control latch 134 locking outputs, MOSFET is in closed condition.
When the cathode voltage of the positive terminal of lithium battery output rose to operating state voltage, cathode voltage was about-0.3-0.6V,
At this moment, the voltage that the voltage that the negative-phase input of comparator 122 is accepted is accepted greater than its normal phase input end, thus the judgement signal of comparator 122 outputs is electronegative potential.Thereby the electronegative potential of output signal is opened in conduct of latch 130 outputs.
The branch pressure voltage V2 of voltage divider 141 outputs is less than its forward input voltage, thereby the output signal of comparator 142 is high potential, and the output signal of not gate 143 is low-voltage,
Two inputs of NOR gate 144 receive respectively electronegative potential and high potential, thereby export an electronegative potential.The termination that arranges of latch 134 is subjected to an electronegative potential, and the end of resetting also receives an electronegative potential, thereby the electronegative potential of output signal is opened in this conduct of locking output.MOSFET is conducting again, and lithium battery can discharge to load again.Namely latch control loop 140 begins to charge and the positive terminal of lithium battery is exported cathode voltage when rising to operating state between charge power supply and lithium battery, controlled and latched the loop contact as the lock-out state of closing output signal, so that the switch loop is in opening state.
Fig. 3 is the analogue simulation schematic diagram in the present invention lithium battery charge and discharge protective loop in an embodiment.As shown in Figure 3, lithium battery charge and discharge protective loop 100 MOSFET in the process that charge power supply is charged to lithium battery and this lithium battery discharges to load does not produce the problem of vibration, and has effectively protected discharging and recharging of lithium battery.
Embodiment effect and effect
In sum; lithium battery charge and discharge protective loop 100 among embodiment design improvement on the basis of charging circuit forms; because it is provided with latchs control loop 140 and is latching loop output when closing the high potential of output signal; control is latched the loop and is locked this high potential; when beginning to charge between charge power supply and the lithium battery and cathode voltage when rising to operating state voltage; control is latched the loop releasing and is closed the lock-out state of output signal so that the switch loop is in opening state; thereby MOSFET often switch and the oscillation problem that produces and the problem that affects load in this process have been avoided; thereby suppressed the deep discharge phenomenon of lithium battery to load, the practical lithium battery that prevented is overcharging; overdischarge; discharge over-current; charge over-current; short circuit causes excess Temperature; burning; even the potential danger such as blast.
Charging and discharging lithium battery provided by the present invention loop is to realize by the improvement to charging circuit in the above-described embodiments, obviously, it can also be realized by other form when latching loop output when closing output signal, control is latched the loop locking and is closed output signal, when beginning to charge between charge power supply and the lithium battery and cathode voltage when rising to operating state voltage, control is latched the loop and is removed and close the lock-out state of output signal so that the switch loop is in opening state.
Claims (6)
1. in the process that charge power supply is charged to lithium battery and this lithium battery discharges to load, described lithium battery is protected for one kind; and the lithium battery charge and discharge protective loop that is connected respectively with the positive terminal of this lithium battery and negative pole end; it is characterized in that having:
The switch loop is connected between described negative pole end and the described load switch control is carried out in the discharge of lithium battery;
Comparison loop is accepted cathode voltage from described positive terminal, judges that based on reference voltage this cathode voltage is operating state voltage or non operating state voltage and exports one and judge signal;
Latch the loop, accept described judgement signal, when described judgement signal is shown as operating state, export one so that described switch loop is in the output signal of opening of opening state, when in a single day described judgement signal shows that described cathode voltage is non operating state voltage, export one so that described switch loop is in the output signal of closing of closed condition; And
Latch control loop, when described when latching that loop output is described closes output signal, control the described described output signal of closing of loop locking that latchs, when beginning to charge between described charge power supply and the described lithium battery and described cathode voltage when rising to described operating state voltage, control the described loop of latching and remove and describedly close the lock-out state of output signal so that described switch loop is in opening state.
2. lithium battery charge and discharge protective according to claim 1 loop is characterized in that:
Wherein, a MOSFET and a not gate are contained in described switch loop, this not gate is accepted describedly to open output signal or describedly close output signal and export a non-gate signal to the grid of described MOSFET, the source electrode of described MOSFET is connected with described negative pole end, the drain electrode of described MOSFET connects to described load
Described comparison loop contains a voltage divider as the first voltage divider, a comparator is as the first comparator, described the first voltage divider is accepted the cathode voltage of described cathode voltage and described negative pole end and is exported first branch pressure voltage, described the first comparator is accepted described the first reference voltage and described the first branch pressure voltage and is exported described judgement signal
A latch is contained in the described loop of latching, and this latch has one end and the end of resetting are set, and the described termination that arranges is subjected to described judgement signal, and described replacement end connects the described control loop that latchs;
The described control loop that latchs contains a voltage divider as the second voltage divider, a comparator is as the second comparator, a not gate, and a NOR gate, described the second voltage divider is accepted second reference voltage and is accepted cathode voltage from described negative pole end, and exports second branch pressure voltage; Described the second comparator is accepted the 3rd reference voltage and described second branch pressure voltage and is exported second comparison output signal; Described not gate is accepted not gate output signal of described the second comparison output signal output; Described NOR gate is accepted described judgement signal and not gate output signal and is exported a locking/ring off signal to the described described replacement end that latchs in the loop.
3. lithium battery charge and discharge protective according to claim 2 loop is characterized in that:
Wherein, described the first reference voltage is about 1.1V,
Described the second reference voltage is about 0.6V,
Described the 3rd reference voltage is about 0V,
The normal phase input end of described the first comparator is accepted described the first reference voltage, and the negative-phase input of described the first comparator is accepted described the first branch pressure voltage,
Described operating state voltage is set to 2.5～4.3V, and when described cathode voltage was described operating state voltage, described judgement signal was electronegative potential,
The described output signal of opening of described latch output is electronegative potential,
Thereby described MOSFET accepts a high potential at described grid is in conducting state,
Described cathode voltage is about 0V, and described the second branch pressure voltage is about 0.3V,
The normal phase input end of described the second comparator is accepted described the 3rd reference voltage, and the negative-phase input of described the second comparator is accepted described the second branch pressure voltage, and described the second comparison output signal is electronegative potential, and described locking/ring off signal also is electronegative potential.
4. lithium battery charge and discharge protective according to claim 2 loop is characterized in that:
Wherein, described the first reference voltage is about 1.1V,
Described the second reference voltage is about 0.6V,
Described the 3rd reference voltage is about 0V,
The normal phase input end of described the first comparator is accepted described the first reference voltage, and the negative-phase input of described the first comparator is accepted described the first branch pressure voltage,
Described operating state voltage is set to 2.5～4.3V, and when described cathode voltage was described non operating state voltage less than 2.5V, described judgement signal was high potential,
The described output signal of closing of described latch output is high potential,
Thereby described MOSFET accepts an electronegative potential at described grid is in closed condition,
Described NOR gate accepts the described judgement signal of high potential so that described locking/ring off signal is electronegative potential, thereby so that the described output signal of closing of described latch is locked in high potential.
5. lithium battery charge and discharge protective according to claim 4 loop is characterized in that:
Wherein, when described charge power supply begins to charge to described lithium battery, when described cathode voltage rose to described operating state voltage, described cathode voltage was about-0.3～-0.6V,
Described the second branch pressure voltage is about-0.1V, and described the second comparison output signal is high potential, and described not gate output signal is low-voltage,
Described judgement signal changes electronegative potential into by high potential,
Locking/ring off signal is that high potential becomes the described output signal of opening so that described latch is exported electronegative potential for the described described replacement end that latchs in the loop, thereby thereby becomes conducting state so that described MOSFET accepts a high potential at described grid.
6. lithium battery charge and discharge protective according to claim 2 loop is characterized in that:
Wherein, described the first reference voltage is the overdischarge threshold voltage.
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| CN201210349429.2A CN102904219B (en) | 2012-09-18 | 2012-09-18 | Lithium battery charging and discharging protective circuit |
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Cited By (5)
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| CN107887956A (en) * | 2017-12-18 | 2018-04-06 | 苏州沃柯雷克智能系统有限公司 | It is a kind of to avoid battery from crossing the protection circuit put and battery supply set |
| CN112087036A (en) * | 2020-09-21 | 2020-12-15 | 深圳市爱都科技有限公司 | Battery activation device and terminal equipment |
| CN112234689A (en) * | 2020-12-14 | 2021-01-15 | 苏州赛芯电子科技股份有限公司 | Charge-discharge protection circuit and lithium battery protection system |
| CN113690992A (en) * | 2021-09-16 | 2021-11-23 | 苏州馥昶空间技术有限公司 | Discharge protection device and discharge system |
| CN116454826A (en) * | 2023-06-14 | 2023-07-18 | 国电投山西能源服务有限公司 | Emergency protection circuit device for circuit fault |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020079869A1 (en) * | 2000-12-26 | 2002-06-27 | Akihiko Fujiwara | Charge/discharge protection circuit for protecting a charge control FET from overheating |
| US20090058365A1 (en) * | 2007-08-29 | 2009-03-05 | Tomoyuki Goto | Secondary battery protection semiconductor device |
| CN101604839A (en) * | 2009-06-05 | 2009-12-16 | 深圳市泉芯电子技术有限公司 | The over-discharge protection circuit of rechargeable battery |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107887956A (en) * | 2017-12-18 | 2018-04-06 | 苏州沃柯雷克智能系统有限公司 | It is a kind of to avoid battery from crossing the protection circuit put and battery supply set |
| CN112087036A (en) * | 2020-09-21 | 2020-12-15 | 深圳市爱都科技有限公司 | Battery activation device and terminal equipment |
| CN112234689A (en) * | 2020-12-14 | 2021-01-15 | 苏州赛芯电子科技股份有限公司 | Charge-discharge protection circuit and lithium battery protection system |
| CN113690992A (en) * | 2021-09-16 | 2021-11-23 | 苏州馥昶空间技术有限公司 | Discharge protection device and discharge system |
| CN116454826A (en) * | 2023-06-14 | 2023-07-18 | 国电投山西能源服务有限公司 | Emergency protection circuit device for circuit fault |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102904219B (en) | 2014-12-31 |
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