CN102904219B - Lithium battery charging and discharging protective circuit - Google Patents
Lithium battery charging and discharging protective circuit Download PDFInfo
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- CN102904219B CN102904219B CN201210349429.2A CN201210349429A CN102904219B CN 102904219 B CN102904219 B CN 102904219B CN 201210349429 A CN201210349429 A CN 201210349429A CN 102904219 B CN102904219 B CN 102904219B
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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
The advantages such as lithium battery, as a kind of conventional batteries, has power supply capacity high, and power quality is light, thus be extensively applied in the portable mobile devices such as mobile phone, video player, audio player.But; the overcharge of lithium battery in discharge and recharge is formed, overdischarge, discharge over-current, charge over-current, short circuit all can have influence on the useful life of lithium battery; thus need when safe design to install charge and discharge protecting loop additional to lithium battery, cause in overcharge, overdischarge, discharge over-current, charge over-current, short circuit the danger that temperature is too high, burning, even blast etc. are potential to prevent lithium battery.
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.As shown in Figure 4,5, in this lithium battery charge and discharge protective loop 1, due to the chemical characteristic of lithium battery self, the usual discharge condition of lithium battery is 2.5V--4.3V, and over-discharge state threshold value is 2.5V.Standby threshold is 1.0V.Namely V-is less than 1V, standby output L; V-is greater than 1V, and standby output H, takes as VSS voltage for 0V.
When the voltage of lithium battery 10 is in 2.5V--4.3V, due to lithium battery powering load, its voltage constantly declines.VD2 comparator exports electronegative potential, and VD2_latch also exports electronegative potential, electric discharge MOSFET2 conducting.
After cell voltage is less than or equal to 2.5V, the output of VD2 comparator becomes high potential, and after time delay, VD2_latch also becomes high potential, and electric discharge MOSFET2 closes.
Now, voltage V-starts to raise, and cell voltage is in rise.The speed that voltage V-raises is determined by the electric capacity of load, when load contains the bulky capacitor being greater than 4700uF, before cell voltage goes back up to more than 2.5V, when V-voltage also cannot reach and rise to more than 1.0V, VD2_latch can be reset end (reset) by it and reset to electronegative potential.I.e. electric discharge MOSFET2 meeting conducting, battery can discharge to load again.Until cell voltage drops to 2.5V again, above-mentioned state will be repeated, thus cause electric discharge MOSFET2 to produce the phenomenon of vibration, until the lithium battery degree of depth there is not electricity.
Degree of depth overdischarge can make the chemical material of lithium battery itself produce irreversible damage, thus decreases battery capacity and life-span.In addition, the frequent switch of over MOSFET, also may can cause damage to load.
The object of the present invention is to provide a kind of lithium battery charge and discharge protective loop; even if when load contains bulky capacitor (being greater than 4700uF); also over condition subsequent can not be made by false triggering; thus the protection not only achieved over-charge of lithium battery electricity, overdischarge, discharge over-current, charge over-current, short circuit, also assures that battery not by deep discharge.
Summary of the invention
The present inventor, in order to solve the problem, have employed following structure.
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: switching circuitry, is connected between negative pole end and load and carries out switch control rule to the electric discharge of lithium battery; Comparison loop, accepts cathode voltage from positive terminal, judges that this cathode voltage is operating state voltage or non operating state voltage and exports one to judge signal based on reference voltage; Latch loop, accept to judge signal, when judging that Signal aspects is operating state, export one make switching circuitry be in opening state open output signal, when judge signal once display cathode voltage be non operating state voltage, exports one make switching circuitry be in closed condition closedown output signal; And latch control loop, when latching loop and exporting closedown output signal, control to latch loop lock and close output signal, start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, control latch loop remove described close output signal lock-out state make switching circuitry be in opening state.
Invention effect and effect
Lithium battery charge and discharge protective loop provided by the invention have employed latches control loop when latching loop and exporting closedown output signal, control to latch this closedown of loop lock output signal, start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, the lock-out state controlling to latch loop releasing closedown output signal makes switching circuitry be in opening state, thus not only achieve in no matter load whether there is bulky capacitor, it is to over-charge of lithium battery electricity, overdischarge, discharge over-current, charge over-current, the protection of short circuit, also assures that battery not by deep discharge.
Accompanying drawing explanation
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 switching circuitry in a specific embodiment, is connected between negative pole end and load and carries out switch control rule to the electric discharge of lithium battery; Comparison loop, accepts cathode voltage from positive terminal, judges that this cathode voltage is operating state voltage or non operating state voltage and exports one to judge signal based on reference voltage; Latch loop, accept to judge signal, when judging that Signal aspects is operating state, export one make switching circuitry be in opening state open output signal, when judge signal once display cathode voltage be non operating state voltage, exports one make switching circuitry be in closed condition closedown output signal; And latch control loop, when latching loop and exporting closedown output signal, control to latch loop lock and close output signal, start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, control latch loop remove described close output signal lock-out state make switching circuitry be in opening state.
As a kind of example; the switching circuitry in lithium battery charge and discharge protective loop provided by the invention contains a MOSFET and not gate; this not gate accepts 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 first voltage divider accepts the cathode voltage of described cathode voltage and described negative pole end and exports first branch pressure voltage, described first comparator described first reference voltage of acceptance and the first branch pressure voltage also export and judge signal
It latches loop and contains a latch, and this latch has one and arranges end and a replacement end, arranging termination by judging signal, resetting end connection and latching control loop;
It latches control loop and contains a voltage divider as the second voltage divider, a comparator as the second comparator, a not gate, and a NOR gate, second voltage divider accepts second reference voltage and accepts cathode voltage from negative pole end, and exports second branch pressure voltage; Described second comparator accepts the 3rd reference voltage and the second branch pressure voltage and exports second comparison output signal; Not gate accepts the second comparison output signal and exports a not gate output signal; NOR gate accepts to judge that signal and not gate output signal and export a locking/ring off signal to the replacement end latched in loop.
In this embodiment, first reference voltage is about 1V, second reference voltage is about 0.6V, 3rd reference voltage is about 0V, the normal phase input end of the first comparator accepts the first reference voltage, the negative-phase input of the first comparator accepts the first branch pressure voltage, operating state voltage is set to 2.5 ~ 4.3V, when cathode voltage is operating state voltage, judge that signal is electronegative potential, latch exports opens output signal for electronegative potential, MOSFET accepts a high potential at grid thus is in conducting state, cathode voltage is about 0V, second branch pressure voltage is about 0.3V, the normal phase input end of the second comparator accepts the 3rd reference voltage, the negative-phase input of the second comparator accepts the second branch pressure voltage, second comparison output signal is electronegative potential, locking/ring off signal is also electronegative potential.
When to be less than 2.5V be non operating state voltage to cathode voltage, judge that signal is high potential, latch exports closes output signal for high potential, MOSFET accepts an electronegative potential at grid thus is in closed condition, the judgement signal that NOR gate accepts high potential makes locking/ring off signal be electronegative potential, thus makes the closedown of latch output signal be locked in high potential.
When described charge power supply starts to charge to lithium battery, when cathode voltage rises to operating state voltage, cathode voltage is about-0.3 ~-0.6V, second branch pressure voltage is about-0.1V, second comparison output signal is high potential, 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 makes latch export electronegative potential to the replacement end latched in loop to become and open output signal, thus makes MOSFET accept a high potential at grid thus become conducting state.
In this embodiment, the first reference voltage is overdischarge threshold voltage.
Below in conjunction with accompanying drawing, lithium battery charge and discharge protective loop provided by the invention 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 improved on the basis of original charge circuit, has switching circuitry 110, comparison loop 120, latches loop 130, latches control loop 140.This lithium battery charge and discharge protective loop 100 is connected with negative pole end VSS respectively with the positive terminal VDD of this lithium battery 10, and protects this lithium battery 10 in the process that charge power supply (not shown) is charged to lithium battery 10 and the 10 pairs of loads 20 of this lithium battery are discharged.
Wherein, between the negative pole end that switching circuitry 110 is connected to lithium battery 10 and load, its function is to carry out switch control rule to the electric discharge of lithium battery 10.
Comparison loop 120 accepts cathode voltage from the positive terminal of lithium battery 10, and its function is to judge that this cathode voltage is operating state voltage or non operating state voltage and exports one to judge signal based on reference voltage.
Latch loop 130 to accept to judge signal, thus when judging that Signal aspects is operating state, export one make switching circuitry 110 be in opening state open output signal; Judge signal once display cathode voltage be non operating state voltage, exports one make switching circuitry be in closed condition closedown output signal.
Latch control loop 140 when latching loop 130 and exporting closedown output signal, control to latch loop 130 and lock closedown output signal; Start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, control latch loop 130 remove close output signal lock-out state make switching circuitry 110 be in opening state.
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, in order to realize switching circuitry 110, there is the function of the electric discharge of lithium battery 10 being carried out to switch control rule, containing a MOSFET and not gate 111 in its structure composition.Not gate 111 acceptance latch loop 130 exports open output signal or close outputs signal and exports 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 MOSFET is in the state of conducting or closedown according to non-gate signal.
Containing a voltage divider 121, comparator (VD2) 122 in comparison loop 120, voltage divider 121 is made up of resistance R1 and resistance R2.
One end of resistance R1 connects the positive terminal of lithium battery, the other end be connected with resistance R2 one end and the negative-phase input of comparator 122.The other end of resistance R2 connects the negative pole end of lithium battery 10.Thus the cathode voltage that voltage divider 121 can accept cathode voltage and negative pole end exports a branch pressure voltage V1.
The normal phase input end of comparator 122 from power supply U acceptance reference voltage Vref 1, thus exports judgement signal based on reference voltage Vref 1 and branch pressure voltage V1.
Latch loop 130 and there is a Postponement module 131, NAND gate 132, not gate 133 and a latch 134.One end of Postponement module 131 connects the output of comparator 122, and the other end connects an input of NAND gate 132.Another input of NAND gate 132 connects the output of comparator 122, and its output connects the input of not gate 133.Latch 134 have one end is set and one reset end, the output arranging end NAND gate 133 is connected, thus accepts the judgement signal that comparison circuit sends, and resets end and connects latch control loop 140.
Latch control loop 140 containing a voltage divider 141, comparator 142, not gate 143, and a NOR gate 144.
Voltage divider 141 has resistance R3 and R4.One end of R3 connects reference voltage Vref 3, and the other end is connected with the negative-phase input of comparator 142 and one end of resistance R4.The other end of resistance R4 connects the negative pole end of lithium battery, thus voltage divider 141 accepts the cathode voltage of reference voltage Vref 3 and negative pole end and exports a branch pressure voltage V2.
The normal phase input end of comparator 142 accepts a reference voltage vref2, thus makes comparator 142 export 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.Thus not gate 143 accepts the comparison output signal that comparator 142 exports, thus export a not gate output signal.
Another link of NOR gate 144 is connected with the output of comparator 122, thus NOR gate 144 accepts judgement signal that comparison loop sends and the not gate output signal that not gate 143 exports, exports a locking signal or ring off signal to the replacement end in latch loop 130.
Because this lithium battery charge and discharge protective loop 100 improves to obtain on the basis of charge circuit, thus, be also provided with the charge switch 112 that switch control rule is carried out in a charging to lithium battery in switching circuitry 110.A charge control loop 150 is also provided with in lithium battery charge and discharge protective loop 100.
This charge control loop 150 is made up 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 overdischarge threshold voltage.
Reference voltage Vref 1 is about 1V, and reference voltage Vref 2 is about 0V, and reference voltage Vref 3 is about 0.6V, and the cathode voltage of lithium battery is taken as and is about 0V, and branch pressure voltage is about 0.3V,
The normal phase input end of comparator 122 accepts reference voltage Vref 1, and the negative-phase input of comparator 122 accepts 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 is operating state voltage, the voltage of the negative-phase input of comparator 122 is greater than the voltage of its normal phase input end, thus its judgement signal exported is electronegative potential.What this electronegative potential inputed to latch 134 after NAND gate 132, not gate 133 arranges end electronegative potential.
The Vref2 (being about 0) that the normal phase input end that the voltage V2 that the negative-phase input of comparator 142 receives is greater than comparator 142 receives, thus the comparison output signal that the output of this comparator 142 exports is electronegative potential, this electronegative potential becomes high potential after not gate 143.
Now, two inputs of NOR gate 144 receive an electronegative potential and a high potential respectively, thus export an electronegative potential to the replacement end of latch.
Therefore latch 132 exports as the electronegative potential opening output signal.
The not gate 111 of the electronegative potential that latch 132 exports in switching circuitry, not gate 111 exports a high potential.MOSFET according to this high potential conducting, thus makes lithium battery can to load discharge.
When the cathode voltage of lithium battery 10 is less than 2.5V, the state of lithium battery is non operating state voltage.Now, the positive input voltage (about 1V) of comparator 122 is greater than its negative input voltage V1, thus comparator 122 exports the high potential as closing output signal.After delay circuit 131 time delay, after NAND gate 132 and not gate 133, export high potential end is set to latch.Thus latch 134 exports one as the high potential of cutting out output signal.
And NOR gate 144 input receives high potential namely exports an electronegative potential to the replacement end of latch 134, thus make latch 134 lock output high potential, MOSFET in switching circuit accepts electronegative potential that not gate 111 exports and is in the state of closedown, thus lithium battery 10 to power to load 20 cut-off.
Power cut-off moment to load 20 from lithium battery 10, due to the characteristic of battery self, cell voltage bottom out, namely in Fig. 2 V-place voltage bottom out and be greater than zero all the time.Namely the voltage of the normal phase input end of comparator 142 is less than the voltage of its negative-phase input all the time, thus this comparator 142 can export an electronegative potential when lithium battery is in non operating state.This electronegative potential is after not gate 143, and not gate 143 exports a high potential to NOR gate 144 input.
Now two inputs of NOR gate 144 all receive high potential signal thus its output exports an electronegative potential as locking/activation signal to the replacement end of latch 134, thus under the non operating state of lithium battery, the signal that latch exports is as high potential all the time, thus MOSFET is in closed condition.That is, latch control loop 140 is when latching loop 130 and exporting closedown output signal, controls latch loop 130 and locks this closedown output signal.
When lithium battery connects charger, namely lithium battery is in by the state of charging, when lithium battery is not also 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 the cathode voltage that now negative pole end of lithium battery exports is about 0.3 ~-0.6V, and the voltage of V-is less than VSS-0.1V.
Comparator 122 exports high potential all the time.This high potential, after Postponement module 131 and NAND gate 132 and not gate 133, be still high potential, thus the output of latch exports a high potential.
At lithium battery 10 by this process of charging, the branch pressure voltage V2 that voltage divider 141 exports 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, thus the dividing potential drop output signal that voltage divider 141 exports is high potential.
Thus latch control loop control latch 134 locks output high potential, MOSFET is in closed condition.
When the cathode voltage that the positive terminal of lithium battery exports rises to operating state voltage, cathode voltage is about-0.3-0.6V,
Now, the voltage that the negative-phase input of comparator 122 accepts is greater than the voltage that its normal phase input end accepts, thus the judgement signal that comparator 122 exports is electronegative potential.Thus latch 130 exports one as the electronegative potential opening output signal.
The branch pressure voltage V2 that voltage divider 141 exports is less than its forward input voltage, thus 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 electronegative potential and high potential respectively, thus export an electronegative potential.The termination that arranges of latch 134 is subject to an electronegative potential, resets end and also receives an electronegative potential, thus locking exports this as the electronegative potential opening output signal.MOSFET is conducting again, and lithium battery can discharge to load again.Namely latch control loop 140 and between charge power supply and lithium battery, start charging and the cathode voltage that the positive terminal of lithium battery exports when rising to operating state, control and latch loop contact as the lock-out state of closing output signal, make switching circuitry be 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 the available protecting discharge and recharge of lithium battery.
Embodiment effect and effect
In sum, lithium battery charge and discharge protective loop 100 in embodiment design improvement on the basis of charging circuit forms, because its latch control loop 140 be provided with is when latching the high potential that loop exports as closedown output signal, control to latch this high potential of loop lock, start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, the lock-out state controlling to latch loop releasing closedown output signal makes switching circuitry be in opening state, thus avoid MOSFET often switch and the oscillation problem that produces and the problem affecting load in this process, thus inhibit lithium battery to the deep discharge phenomenon of load, practical prevents lithium battery in overcharge, overdischarge, discharge over-current, charge over-current, short circuit causes temperature too high, burning, the danger that even blast etc. are potential.
Charging and discharging lithium battery loop provided by the present invention is in the above-described embodiments by realizing the improvement of charging circuit, obviously, it can also realize when latching loop and exporting closedown output signal by other form, control to latch loop lock and close output signal, start to carry out charging between charge power supply and lithium battery and cathode voltage rises to operating state voltage time, control latch loop remove close output signal lock-out state make switching circuitry be in opening state.
Claims (5)
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 be connected respectively with negative pole end with the positive terminal of this lithium battery; it is characterized in that having:
Switching circuitry, is connected between described negative pole end and described load and carries out switch control rule to the electric discharge of lithium battery;
Comparison loop, accepts cathode voltage from described positive terminal, judges that this cathode voltage is operating state voltage or non operating state voltage and exports one to judge signal based on reference voltage;
Latch loop, accept described judgement signal, when described judgement Signal aspects is operating state, export one make described switching circuitry be in opening state open output signal, when described judgement signal is non operating state voltage once show described cathode voltage, export a closedown output signal making described switching circuitry be in closed condition; And
Latch control loop, when described latch loop exports described closedown output signal, control to close output signal described in described latch loop lock, start to carry out charging between described charge power supply and described lithium battery and described cathode voltage rises to described operating state voltage time, controlling the described lock-out state of closing output signal of described latch loop releasing makes described switching circuitry be in opening state
Wherein, described switching circuitry contains a MOSFET and not gate, this not gate accepts describedly to open output signal or described closedown output signal and export a non-gate signal to the grid of described MOSFET as the first not gate, 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 first voltage divider accepts the cathode voltage of the described negative pole end of described cathode voltage and described lithium battery and exports first branch pressure voltage, described first comparator accepts as the described reference voltage of the first reference voltage and described first branch pressure voltage and exports described judgement signal
A latch is contained in described latch loop, and this latch has one and arranges end and a replacement end, and the described termination that arranges is by described judgement signal, and described replacement end connects described latch control loop,
Described latch control loop contains a voltage divider as the second voltage divider, a comparator is as the second comparator, a not gate is as the second not gate, and a NOR gate, described second voltage divider accepts second reference voltage and accepts cathode voltage from the negative pole end of described load, and export second branch pressure voltage, described second comparator accepts the 3rd reference voltage and described second branch pressure voltage and exports second comparison output signal, described second not gate accepts described second comparison output signal and exports a not gate output signal, the described not gate that described NOR gate accepts described judgement signal and described second not gate output outputs signal and exports a locking/ring off signal to the described replacement end in described latch loop.
2. lithium battery charge and discharge protective loop according to claim 1, is characterized in that:
Wherein, described first reference voltage is about 1.1V,
Described second reference voltage is about 0.6V,
Described 3rd reference voltage is about 0V,
The normal phase input end of described first comparator accepts described first reference voltage, and the negative-phase input of described first comparator accepts described first branch pressure voltage,
Described operating state voltage is set to 2.5 ~ 4.3V, and when described cathode voltage is described operating state voltage, described judgement signal is electronegative potential,
Described latch exports described output signal of opening for electronegative potential,
Described MOSFET accepts a high potential at described grid thus is in conducting state,
The described cathode voltage of the described negative pole end of described lithium battery is about 0V, and described second branch pressure voltage is about 0.3V,
The normal phase input end of described second comparator accepts described 3rd reference voltage, and the negative-phase input of described second comparator accepts described second branch pressure voltage, and described second comparison output signal is electronegative potential, and described locking/ring off signal is also electronegative potential.
3. lithium battery charge and discharge protective loop according to claim 1, is characterized in that:
Wherein, described first reference voltage is about 1.1V,
Described second reference voltage is about 0.6V,
Described 3rd reference voltage is about 0V,
The normal phase input end of described first comparator accepts described first reference voltage, and the negative-phase input of described first comparator accepts described first branch pressure voltage,
Described operating state voltage is set to 2.5 ~ 4.3V, and when to be less than 2.5V be described non operating state voltage to described cathode voltage, described judgement signal is high potential,
Described latch exports described cut out output signal for high potential,
Described MOSFET accepts an electronegative potential at described grid thus is in closed condition,
The described judgement signal that described NOR gate accepts high potential makes described locking/ring off signal be electronegative potential, thus makes the described closedown output signal of described latch be locked in high potential.
4. lithium battery charge and discharge protective loop according to claim 3, is characterized in that:
Wherein, when described charge power supply starts to charge to described lithium battery, when described cathode voltage rises to described operating state voltage, the described cathode voltage of the described negative pole end of described lithium battery is about-0.3 ~-0.6V,
Described second branch pressure voltage is about-0.1V, and described second comparison output signal is high potential, and the described not gate output signal that described second not gate exports is low-voltage,
Described judgement signal changes electronegative potential into by high potential,
Locking/ring off signal is that high potential makes described latch export electronegative potential to the described replacement end in described latch loop to become described and open output signal, thus makes described MOSFET accept a high potential at described grid thus become conducting state.
5. lithium battery charge and discharge protective loop according to claim 1, is characterized in that:
Wherein, described first reference voltage is overdischarge threshold voltage.
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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 |
| CN112234689B (en) * | 2020-12-14 | 2021-03-09 | 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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| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102904219A (en) | 2013-01-30 |
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