CN102520359A - Battery management system and method for short circuit detection and turn-off by adopting same - Google Patents
Battery management system and method for short circuit detection and turn-off by adopting same Download PDFInfo
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- CN102520359A CN102520359A CN2011103951908A CN201110395190A CN102520359A CN 102520359 A CN102520359 A CN 102520359A CN 2011103951908 A CN2011103951908 A CN 2011103951908A CN 201110395190 A CN201110395190 A CN 201110395190A CN 102520359 A CN102520359 A CN 102520359A
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Abstract
The invention provides a battery management system which comprises a short circuit detection and self-locking module and a circuit shut-off module, wherein the short circuit detection and self-locking module comprises a short circuit detection module for short circuit detection and a self-locking module for short circuit turnoff and locking when the short circuit detection module detects that a circuit is short-circuited, and the short circuit detection module comprises a detection signal line and a first comparator connected with the detection signal line to carry out detection data and reference data comparison; and the circuit shut-off module is used for receiving a circuit status signal sent out by the self-locking module to carry out circuit turn-on or turn-off treatment according to the circuit status signal. With the adoption of the battery management system, the turn-off treatment can be quickly carried out on the short-circuited circuit.
Description
Technical field
The present invention relates to the series battery administrative skill, relate in particular to and a kind ofly have the battery management system of short-circuit detecting and turn-off function and adopt this system to carry out the method for short-circuit detecting and shutoff.
Background technology
The electric weight that battery management system is in charge of battery, electric battery calculates, controls, protects, the signal communication that the electric quantity balancing between each battery or electric battery, various electrical detection and system are inside and outside.Generally speaking, so long as use the product of battery, the battery management system of all need arranging in pairs or groups is controlled, and especially uses the high more electric battery of battery series connection number, needs complicated battery management function more.With the vehicles, the string number can be divided into levels such as electric bicycle, battery-operated motor cycle, electric golf cart, electric automobile from less to more.The series connection number is high more, represents required voltage high more.
Battery management system generally includes Balance Control between signal detectings such as voltage, temperature, electric current, each battery or electric battery, cross various technology such as parameter estimation such as protection mechanism, battery capacity, health status such as charging and discharging protection, short circuit detecting and shutoffs and Communication Control and electronic circuit, software and hardware accordingly.To the voltage detecting of series-connected cell, generally speaking, available scan-type is promptly detected the voltage of each battery respectively in regular turn in the time at a section, and sees through amplifier and A/D converter offers microcontroller with signal.Battery equilibrium to series-connected cell; Be divided into two kinds of active balance and passive type balances: the mode that active balance is to use energy to shift; Unnecessary electric weight in electric battery or single the battery is transferred to the not enough battery of electric weight, thereby but when charging, static or discharge equal balances; The passive type balance is to use the mode of energy dissipation, and electric weight unnecessary in each battery is dissipated heat with resistance mode, and only can balance when charging.This kind passive type balance can be referred to disclosed Chinese invention patent application CN 101986508 A numbers on March 16th, 2011; This patented claim discloses a kind of battery balanced device; This battery balanced device is employed in the other resistance of installing of electric battery, so that in certain battery charge amount during faster than other batteries, the charging current of this battery is switched on this resistance; Stoping this battery charge, and convert its rechargeable electrical energy to thermal dissipation and go out.
As for the defencive function of battery management system, must possess mechanism such as protection of charging and discharging (comprising overcharging and the overdischarge detection), short-circuit detecting and shutoff.Usually can adopt the switch of fixing protection IC scheme collocation peripheral circuit design to realize, yet this mode is subject to the support of the function of protection IC own, or the providing of unnecessary function.Especially the function of short circuit detecting can be subject to the protection detecting time that IC spent, and could carry out and turn-off action, thereby the time of causing short circuit to detect and turn-off is longer.In addition, the conventional battery management system needs another piece circuit to carry out the recovery of short circuit after turn-offing end through the short circuit detecting, thereby makes that the design of battery management system is comparatively complicated.
Therefore, be necessary to provide a kind of new battery management system and adopt method that this system carries out short-circuit detecting and shutoff to overcome the problems referred to above.
Summary of the invention
The object of the present invention is to provide a kind of battery management system that can carry out the short circuit shutoff fast.
Another object of the present invention is to a kind of method that adopts this battery management system to carry out short-circuit detecting and shutoff fast.
Correspondingly; Battery management system of the present invention; Comprise: short-circuit detecting and self-locking module; This short-circuit detecting and self-locking module comprise in order to the short-circuit detecting module of carrying out short-circuit detecting and after the short-circuit detecting module detects the short circuit generation, carry out short circuit and turn-off the self-locking module that locks that said short-circuit detecting module comprises signal lines and is connected in this signal lines to detect data and reference data first comparer relatively; And
Breaking circuit module, this breaking circuit module are received from the circuit condition signal that lock module sends and handle to carry out conducting or breaking circuit according to this circuit condition signal.
As further improvement of the present invention; Said self-locking module comprises lock-in circuit unit that is connected in the short-circuit detecting module and the release circuit unit that is connected with the lock-in circuit unit; Said lock-in circuit unit comprises rest-set flip-flop, and said release circuit unit comprises NAND gate circuit.
As further improvement of the present invention, said breaking circuit module comprises discharge shutoff unit, and said discharge is turn-offed the unit and is provided with a FET that when short circuit takes place, carries out the circuit shutoff.
As further improvement of the present invention, said battery management system also comprises a level translator that is connected between short-circuit detecting and self-locking module and the breaking circuit.
As further improvement of the present invention; Said battery management system also comprises the voltage detecting module that a pair of battery both sides voltage detects; And the signal of connection voltage detecting module and short-circuit detecting and self-locking module amplification module, said signal amplifies module and comprises in order to carry out current detection signal electric current transmitted signal amplification module.
As further improvement of the present invention, said battery management system comprises that one has the electric battery of some series-connected cells and is connected in this electric battery said battery is carried out the passive equilibrium module of charge capacity Balance Control.
As further improvement of the present invention, according to the method that said battery management system carries out short-circuit detecting and shutoff, this battery management system also comprises microcontroller, and this method comprises the steps:
S01, the short-circuit detecting module receives the signal that characterizes short-circuit condition after give the self-locking module by the first comparer output short circuit protection notification signal;
S02, the self-locking module is carried out short circuit shutoff locking after receiving said short-circuit protection notification signal, and sends said short-circuit protection notification signal and take place for notice microcontroller and breaking circuit module short circuit;
S03, breaking circuit module shuts down circuit is to carry out short-circuit protection and to forbid output;
S04, microcontroller detect behind discharge control signal from the said short-circuit protection notification signal to self-locking module output low level with the self-locking module that resets.
As further improvement of the present invention, said short-circuit protection notification signal is a low level signal.
As further improvement of the present invention, said discharge control signal is a low level signal.
As further improvement of the present invention, also comprise the steps:
S05 waits for 500us to 20ms after the S04 step, microcontroller to the discharge control signal of self-locking module output high level so that the breaking circuit conducting;
S06; Repeat above-mentioned S01 to S05 step; Be decreased to gradually in protection voltage or the current margin until voltage that the short-circuit detecting module receives or electric current, when voltage that the short-circuit detecting module receives after repeating above-mentioned S01 to S05 step or electric current do not change then microcontroller no longer remove to treat short circuit to the discharge control signal of self-locking module output high level.
The invention has the beneficial effects as follows: but short-circuit detecting through battery management system of the present invention and self-locking module and breaking circuit module fast detecting short-circuit state and the shutoff of in time carrying out short circuit current are handled; Thereby carry out the defencive function of circuit effectively; It is less that its circuit relates to assembly, simplicity of design and easy the realization.
Description of drawings
Fig. 1 is the frame circuit diagram of battery management system one embodiment of the present invention;
Fig. 2 is the short-circuit detecting of battery management system among Fig. 1 and the detailed circuit diagram of self-locking module;
Fig. 3 is the detailed circuit diagram of the breaking circuit module of battery management system among Fig. 1;
Fig. 4 is the time series analysis figure that battery management system of the present invention carries out short-circuit detecting and shutoff;
Fig. 5 is that battery management system of the present invention carries out the time series analysis figure that short circuit is resumed work.
Embodiment
Below will combine each embodiment shown in the drawings to describe the present invention.But these embodiments do not limit the present invention, and the conversion on the structure that those of ordinary skill in the art makes according to these embodiments, method or the function all is included in protection scope of the present invention.
See also shown in Figure 1 for an embodiment of battery management system 100 of the present invention.This battery management system 100 comprises the series battery with several series-connected cells, the passive equilibrium module BLS that is connected in these batteries and voltage detecting module CH_SELECT, is connected in signal amplification module A MP, microcontroller MCU, short-circuit detecting and self-locking module S_LOCK and other drive circuit die set 7 of voltage detecting module CH_SELECT.Said other drive circuit die set 7 comprise level translator (not shown), connect the breaking circuit module 71 and the trickle charging circuit module (not shown) of level translator.
See also shown in Figure 1ly, series battery of the present invention comprises eight battery BAT1 ~ BAT8 that are connected in series, and said battery is a lithium ion battery, also can be ferric phosphate lithium cell.Said passive equilibrium module BLS adopts the mode that realizes the passive type balance with resistance, in order to too fast if there is battery electric quantity to fill when the battery charge, then with the mode of resistance consumption with unnecessary energy dissipation so that reach the charge capacity balance between each battery.Said voltage detecting module CH_SELECT in order to detect battery both sides voltages at nodes and should detected voltage VSN+ and VSN-offer signal amplification module A MP, carry out the detection of circuital current simultaneously.Said signal amplifies module A MP and comprises that voltage signal amplifies module 41 and current signal amplifies module 42.Voltage signal amplification module 41 is a high common mode subtracter among the present invention.This high common mode subtracter 41 comprises two amplifiers (not shown), and it is input as aforementioned VSN+ and VSN-voltage signal, and output ADV voltage signal also feeds back to microcontroller MCU with it.Electric current amplifies module 42 the ADI current signal that it receives is fed back to microcontroller MCU.
See also the detailed circuit diagram for short-circuit detecting and self-locking module S_LOCK shown in Figure 2.Said short-circuit detecting and self-locking module S_LOCK comprise short-circuit detecting module 61 and self-locking module 62.The big current detection signal line of the ISN that this short-circuit detecting module 61 comprises input end and be connected in the comparator circuit of the big current detection signal line of this ISN.This comparator circuit comprises one first comparer U4.The big current detecting scope of the big current detection signal line of this ISN wherein, generally three times according to maximum operating currenbt compare calculating.In the course of work of battery management system 100 of the present invention, at every moment all in the detection of carrying out electric current.From circuit diagram shown in Figure 2, can find out; Suppose that WV Vcc is 3.6V; The benchmark of the first comparer U4 among the present invention then; Be that reference data equals the ratio that WV Vcc multiply by resistance R 26 and resistance R 25 and R26 sum, thereby take place that then the first comparer U4 can send signal if any short circuit.
Said self-locking module 62 is connected in the output terminal of the first comparer U4 in the short-circuit detecting module 61, and comprises lock-in circuit unit and release circuit unit.Wherein the signal that sends of the first comparer U4 is received by lock-in circuit.Said lock-in circuit unit comprises rest-set flip-flop, and sends discharge control signal DSG and short-circuit protection notification signal PRT according to the signal that the first comparer U4 sends to the release circuit unit.Said release circuit unit comprises a NAND gate circuit, and said discharge control signal DSG and short-circuit protection notification signal PRT are through said NAND gate circuit output.The discharge control signal DSG of said release circuit unit, short-circuit protection notification signal PRT signal also can be sent by microcontroller MCU, and low level is effective.When being short-circuited, latching circuit can carry out short circuit and turn-off locking and send short-circuit protection notification signal PRT and give breaking circuit module 71, this moment breaking circuit module 71 just can breaking circuit to prevent that circuit from being burnt out.Carrying out short circuit if desired recovers; Removed under the situation about can recover can't confirming short-circuit conditions; Sound out through opening breaking circuit; Microcontroller MCU can directly give self-locking module 62 pulse signals through discharge control signal DSG, promptly is equivalent to resetting of aforementioned rest-set flip-flop, recovers to carry out short circuit.This shows; When being short-circuited, having little time to respond short circuit even microcontroller MCU is handling other information and handle rest-set flip-flop; Be that the lock-in circuit unit also can be controlled breaking circuit module 71 and turn-offs processing; And then make that the short circuit turn-off speed is very fast, and can in time carry out the short circuit electric circuit protection, make that use is safer; In addition; Battery management system 100 of the present invention also can be that pulse signal carries out the short circuit recovery through the discharge control signal DSG that microcontroller MCU sends; Recovery after can making short circuit remove is quick, and stable and circuit design and simple to operate only adopts this same circuit can realize short circuit detecting and restore funcitons simultaneously among the present invention; And then do not need extra restoring circuit design, make that the overall circuit design is comparatively simple and be prone to realization.
See also the detailed circuit diagram of Fig. 3 for breaking circuit module 71 among the present invention, said breaking circuit module 71 comprises charging breaking circuit unit and discharge breaking circuit unit, to be responsible for the shutoff action of two kinds of situations of charge and discharge respectively; In addition, after this breaking circuit module 71 receives the signal from self-locking module 62, promptly can determine to turn-off or recover.
See also the detailed circuit diagram of relevant charging breaking circuit unit among Fig. 3; The circuit design of this charging breaking circuit unit; It mainly is the turn-off protection of being responsible for battery overcharge and overdischarge; The general mode charging signals CHG that cut-off signals main reference microcontroller MCU offers charging breaking circuit unit confirms, and charging breaking circuit unit has two level RPs, and exemplified of the present invention is 3.6V and 12V as shown in Figure 3.In conjunction with Fig. 3; The course of work of charging breaking circuit unit is: when CHG signal low level, and triode Q87 conducting, it is 3.6V that WV is provided in this embodiment; And through diode D4, resistance R 130; After triode Q86 conducting, the gate charge of FET Q84 were released through diode D3 and triode Q86, FET Q84 closed; When CHG signal high level; Triode Q87 turn-offs; The base stage of triode Q86 does not have forward bias and turn-offs at this moment; The grid power supply that this moment, reference voltage 12V gave FET Q84 through diode D2, resistance R 136, R129 and triode Q85, FET Q84 opens to carry out the charging action of circuit.
See also the detailed circuit diagram of relevant discharge breaking circuit unit among Fig. 3; The circuit design of this discharge breaking circuit; Mainly be in order to carry out short-circuit protection; Require turn-off speed as quickly as possible, the self-locking module that the front is said is through self-locking and send short-circuit protection notification signal PRT and issue breaking circuit module 71, promptly is to issue discharge breaking circuit unit.This discharge breaking circuit unit with the difference of charging breaking circuit unit is: discharge the breaking circuit unit in order to carry out short-circuit protection on the one hand, then require turn-off speed as quickly as possible; Be that charging breaking circuit unit has two level RPs on the other hand, and discharge breaking circuit unit only have one; Another has not had electricity when all batteries exactly, and requirement this moment can only be charged, and can not discharge; And actual conditions are: microcontroller MCU does not work; Each interface comprises that DSG signal and CHG signal all are in high level, and the breaking circuit unit that discharges this moment is in open function.In addition, the output terminal node J4-1 of this discharge breaking circuit unit is connected to the big current detection signal line of ISN of short-circuit detecting module 61.
The course of work that discharge breaking circuit unit is described in conjunction with Fig. 1 to Fig. 3 is following: when discharge is turn-offed by microcontroller MCU analysis generation; The DSG signal that microcontroller MCU sees off becomes low level; Just the NAND gate circuit input low level in the release circuit unit makes the release circuit unit export high level CUT_A, output low level CUT_B behind this high level CUT_A process level translator U2; Wherein this level translator U2 mainly is that the 3.6V conversion of signals with CUT_A is the 12V signal of CUT_B; And when the CUT_A high level, can cause the CUT_B low level, the breaking circuit unit that discharges at this moment carries out power amplification with the low level signal CUT-B that receives, and exports the grid of FET Q83 to; FET Q83 is turn-offed, thereby accomplish the discharge turn-off function of discharge breaking circuit unit; Turn-offing when discharge is when being caused by short circuit, and instantaneous large-current is through P-, through FET Q84 and Q83; Flow through R128 to GND (GND is the total negative of polyphone battery), so when big electric current flows through R128, will produce peak voltage at the R128 two ends; And via the big current detection signal of ISN linear flow to the first comparer U4, after the first comparer U4 received the peak voltage signal that characterizes short circuit, output low level was given the lock-in circuit unit; Consult Fig. 3, this moment, the PRT signal of lock-in circuit unit output low level was given release circuit unit, just the NAND gate circuit input low level in the release circuit unit; Make release circuit export high level CUT_A; Output low level CUT-B behind this high level CUT_A process level translator U2, the breaking circuit unit that discharges this moment carries out power amplification with the low level signal CUT-B that receives, and exports the grid of FET Q83 to; FET Q83 is turn-offed, thereby accomplish the short circuit turn-off function of discharge breaking circuit unit.
Get by above; It is following with the principle of work or the method for turn-offing that battery management system 100 of the present invention carries out the short circuit detecting: when big electric current takes place; The big current detection signal line of ISN of discharge breaking circuit unit can receive high voltage; Big current flowing resistance R128 also produces peak voltage at resistance R 128 two ends, gives self-locking module 62 via output low level behind the first comparer U1 of short-circuit detecting module 61; Self-locking module 62 receives promptly carries out short circuit behind the low level signal of short-circuit detecting module 61 and turn-offs locking expression short circuit, and the PRT signal of output low level gives breaking circuit module 71, simultaneously low level PRT signal is issued the short circuit of microcontroller MCU notice and takes place; Breaking circuit module 71 receives the action of promptly turn-offing behind the low level PRT signal of self-locking module, thus the detecting of Rapid Realization short circuit and turn-off function.Carry out short circuit if desired and recover, then through sending the DSG pulse signal with the method as recovery, the principle of work of specifically joining follow-up recovery.
See also the time series analysis figure that carries out short circuit detecting and shutoff for battery management system 100 of the present invention shown in Figure 4.From this figure, can find out; Terminal in first period; Short circuit takes place, and the ISN signal wire receives high voltage, gives self-locking module 62 via the first comparer U4 output low level signal of short-circuit detecting module 61; First period of this moment finishes, and wherein the Comparator pin_1 among Fig. 4 is the benchmark signal of the first comparer U4; Second period was from relatively detecting signal to the 71 complete required times of breaking circuit of breaking circuit module; Main process is: self-locking module 62 receives carries out short circuit behind the low level signal of short-circuit detecting module 61 and turn-offs locking; And the PRT signalisation microcontroller MCU short circuit of output low level takes place; Export the CUT_A signal of high level simultaneously; Output low level CUT-B signal makes circuit turn-off to forbid the FET Q83 conducting in the breaking circuit module 71 behind this high level CUT_A signal process level translator U2; The 3rd period was to forbid exporting the period, and this period length is not limit, and is main by the processing speed of microcontroller MCU and how much deciding of task; The 4th period was resetting of self-locking module 62; Mainly be after microcontroller MCU receives the low level PRT signal of self-locking module 62 notices; The discharge control signal DSG of meeting output low level is with the self-locking module 62 that resets; Promptly define self-locking module 62 again, that is make the PRT signal become high level.
See also and shown in Figure 5ly carry out the time series analysis figure that short circuit is resumed work for battery management system 100 of the present invention; The main mode that shows that microcontroller MCU sounds out through the DSG signal that sends high level checks whether short circuit removes the method for carrying out the short circuit recovery among this figure; The protect thresholds that wherein is arranged in the top is the protective wire of circuit electric current; Rear current is the actual electric current that passes through; The number of times that on behalf of microcontroller MCU, try times sound out; Be the situation that self-locking module 62 notice microcontroller MCU are short-circuited when the part corresponding with try times shows low level in signal " PRT " signal lines, MOSFET drive is other drive circuit die set 7, mainly shows the state of the FET Q83 in the breaking circuit module 71.Wherein consult this Fig. 5; When being short-circuited, when promptly the PRT signal is low level, the DSG signal of microcontroller MCU output high level; This moment, the CUT_B signal was output as high level; Then the FET Q83 in the breaking circuit module 71 opens, if short-circuit condition still keeps, then can see current surge in the rear current line; When the electric current in the rear current line during greater than protect thresholds line; Self-locking module 62 will be carried out short circuit and turn-offed locking; Turn-off output current; The PRT signal of output low level is given microcontroller MCU in addition, and the DSG signal of output low level carries out circuit for breaking circuit module 71 and turn-offs processing simultaneously; After a while, be approximately 500us to 20ms, look the voltage, power of electric battery and decide, microcontroller MCU carries out attempting the second time output, and monitoring PRT signal, and output is attempted so repeatedly, in certain period of time, exports set of pulses sequence like Fig. 5.If the outside is the false short circuit that is caused by capacitive load, ginseng rear current line, the pulse current sequence can reduce gradually, thus normal the startup.If the outside is true short circuit, then the pulse current sequence can not reduce.After attempting several times, if pulse current does not reduce, then microcontroller MCU should keep the sufficiently long time not reattempt, and exhales with the heat of guaranteeing FET Q83 accumulation.
In sum; The present invention adopts microcontroller MCU, short-circuit detecting and self-locking module S_LOCK and breaking circuit module 71 can realize the detecting of short circuit fast and turn-off; And can adopt same circuit to carry out the recovery of short-circuit condition, circuit is simple and be prone to realization, uses safer.
Be to be understood that; Though this instructions is described according to embodiment; But be not that each embodiment only comprises an independently technical scheme, this narrating mode of instructions only is for clarity sake, and those skilled in the art should make instructions as a whole; Technical scheme in each embodiment also can form other embodiments that it will be appreciated by those skilled in the art that through appropriate combination.
The listed a series of detailed description of preceding text only is specifying to feasibility embodiment of the present invention; They are not in order to restriction protection scope of the present invention, allly do not break away from equivalent embodiment or the change that skill of the present invention spirit done and all should be included within protection scope of the present invention.
Claims (10)
1. a battery management system is characterized in that, said battery management system comprises:
Short-circuit detecting and self-locking module; This short-circuit detecting and self-locking module comprise in order to the short-circuit detecting module of carrying out short-circuit detecting and after the short-circuit detecting module detects the short circuit generation, carry out short circuit and turn-off the self-locking module that locks that said short-circuit detecting module comprises signal lines and is connected in this signal lines to detect data and reference data first comparer relatively; And
Breaking circuit module, this breaking circuit module are received from the circuit condition signal that lock module sends and handle to carry out conducting or breaking circuit according to this circuit condition signal.
2. battery management system according to claim 1; It is characterized in that; Said self-locking module comprises lock-in circuit unit that is connected in the short-circuit detecting module and the release circuit unit that is connected with the lock-in circuit unit; Said lock-in circuit unit comprises rest-set flip-flop, and said release circuit unit comprises NAND gate circuit.
3. battery management system according to claim 1 is characterized in that, said breaking circuit module comprises discharge shutoff unit, and said discharge is turn-offed the unit and is provided with a FET that when short circuit takes place, carries out the circuit shutoff.
4. battery management system according to claim 1 is characterized in that, said battery management system also comprises a level translator that is connected between short-circuit detecting and self-locking module and the breaking circuit.
5. battery management system according to claim 1; It is characterized in that; Said battery management system also comprises the voltage detecting module that a pair of battery both sides voltage detects; And the signal of connection voltage detecting module and short-circuit detecting and self-locking module amplification module, said signal amplifies module and comprises in order to carry out current detection signal electric current transmitted signal amplification module.
6. battery management system according to claim 5 is characterized in that, said battery management system comprises that one has the electric battery of some series-connected cells and is connected in this electric battery said battery is carried out the passive equilibrium module of charge capacity Balance Control.
7. battery management system according to claim 1 carries out the method for short-circuit detecting and shutoff, and this battery management system also comprises microcontroller, it is characterized in that, this method comprises the steps:
S01, the short-circuit detecting module receives the data detection signal that characterizes short-circuit condition and gives the self-locking module after compare back output short circuit protection notification signal by first comparer and reference data;
S02, the self-locking module is carried out short circuit shutoff locking after receiving said short-circuit protection notification signal, and sends said short-circuit protection notification signal and take place for notice microcontroller and breaking circuit module short circuit;
S03, breaking circuit module shuts down circuit is to carry out short-circuit protection and to forbid output;
S04, microcontroller export discharge control signal with the self-locking module that resets to the self-locking module after detecting said short-circuit protection notification signal.
8. the method for short-circuit detecting according to claim 7 and shutoff is characterized in that, said short-circuit protection notification signal is a low level signal.
9. the method for short-circuit detecting according to claim 7 and shutoff is characterized in that, said discharge control signal is a low level signal.
10. the method for short-circuit detecting according to claim 7 and shutoff is characterized in that, also comprises the steps:
S05 waits for 500us to 20ms after the S04 step, microcontroller to the discharge control signal of self-locking module output high level so that the breaking circuit conducting;
S06; Repeat above-mentioned S01 to S05 step; Be decreased to gradually in protection voltage or the current margin until voltage that the short-circuit detecting module receives or electric current, when voltage that the short-circuit detecting module receives after repeating above-mentioned S01 to S05 step or electric current do not change then microcontroller no longer remove to treat short circuit to the discharge control signal of self-locking module output high level.
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| CN104104067A (en) * | 2013-04-12 | 2014-10-15 | 东莞钜威新能源有限公司 | Short circuit protection circuit |
| CN104655973A (en) * | 2013-11-25 | 2015-05-27 | 艾默生网络能源有限公司 | Method and device for detecting battery module short circuit in UPS system |
| CN104655973B (en) * | 2013-11-25 | 2017-09-05 | 艾默生网络能源有限公司 | A kind of method and apparatus that battery module short circuit is detected in ups system |
| CN109659907A (en) * | 2018-12-24 | 2019-04-19 | 惠州市蓝微电子有限公司 | A kind of lithium battery short-circuit detection protection method |
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Application publication date: 20120627 |