CN104104067A - Short circuit protection circuit - Google Patents
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- CN104104067A CN104104067A CN201310577425.4A CN201310577425A CN104104067A CN 104104067 A CN104104067 A CN 104104067A CN 201310577425 A CN201310577425 A CN 201310577425A CN 104104067 A CN104104067 A CN 104104067A
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- 238000007689 inspection Methods 0.000 claims description 58
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000005059 dormancy Effects 0.000 claims description 25
- 230000003321 amplification Effects 0.000 claims description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000005669 field effect Effects 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 4
- 230000002618 waking effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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Abstract
The invention discloses a short circuit protection circuit. The short circuit protection circuit comprises a cell module, a short circuit detection module, a latch module and a switch control module. The cell module comprises a controlled switch M and a current-detecting resistor Rs. The short circuit detection module detects whether a loop formed by a load of the cell module and the cell module is short circuited through the current-detecting resistor Rs and outputs a short circuit signal when the loop is short circuited. The latch module is connected with the short circuit detection module and is used for latching the short circuit signal and outputting the signals. The switch control module is connected with the latch module and is used for outputting a switch cutoff signal when receiving the short circuit signal. The controlled switch M is connected with the switch control module and is used for disconnecting the loop when receiving the switch cutoff signal. Through the above structure, short-circuit protection speed can be accelerated, and misoperation since the short circuit signal cannot be latched can be avoided.
Description
Technical field
The present invention relates to battery management technical field, particularly relate to a kind of short-circuit protection circuit.
Background technology
Along with the development of new energy technology, the manufacturing technology of various battery products also reaches its maturity.For example, lithium ion battery, lithium polymer battery etc.Battery product generally applies to various electronic equipments, in order to guarantee that battery and electronic equipment avoid damage when the short circuit, is typically provided with short-circuit protection circuit in battery product.
Refer to Fig. 1, Fig. 1 is the structural representation of the short-circuit protection circuit of prior art.Load and the controlled switch M ＇ series connection of inspection leakage resistance Rs ＇, battery B, battery B, differential amplification module will be examined leakage resistance Rs ＇ both end voltage and amplify, comparator A ＇ relatively exports Different Results Vout2 to the interrupt pin INT of microprocessor by voltage Vout1 after amplifying and reference voltage Vref, interrupt pin INT low level triggers interrupts, and controls controlled switch M ＇ and disconnect after interrupt response.During normal work, the upper electric current of inspection leakage resistance Rs ＇ is less than rated current, and the output valve Vout1 of differential amplification module is less than reference voltage Vref, so Vout1 is high level always, can not trigger microprocessor interruption, so controlled switch M ＇ conducting always.When battery or load short circuits; on inspection leakage resistance Rs ＇, transient flow is crossed great electric current overrate; the output valve Vout1 of differential amplification module is greater than reference voltage Vref; therefore the Output rusults Vout2 of comparator A ＇ becomes low level; down trigger; controlled switch M ＇ disconnects, and discharge loop is cut off, and then reaches the object of short-circuit protection.
But the short-circuit protection circuit of prior art at least has following 2 weak points:
1. what prior art adopted is the mode that software interrupt is controlled, and has certain wait-for-response time delay, affects the speed of short-circuit protection, in the short circuit current occasion possibility of turn-offing compared with large, damage device because close not in time.
2. after battery B or load short circuits, controlled switch M ＇ turn-offs, on inspection leakage resistance Rs ＇, no current flows through, therefore the output valve Vout1 of differential amplification module is less than reference voltage Vref, interrupt pin INT becomes high level again from low level, controlled switch M ＇ conducting again, interrupt pin INT cannot, by signal latch, easily cause misoperation after receiving signal.
Therefore, need to provide a kind of short-circuit protection circuit, to address the above problem.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of short-circuit protection circuit, can accelerate short-circuit protection speed, and can avoid can not latching because of short-circuit signal the misoperation causing.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of short-circuit protection circuit is provided, short-circuit protection circuit comprises battery module, short-circuit detecting module, latch module and switch control module, battery module comprises controlled switch M and inspection leakage resistance Rs, short-circuit detecting module detects the whether short circuit of the load of battery module and loop that battery module forms by inspection leakage resistance Rs, and when short circuit output short-circuit signal, latch module is connected with short-circuit detecting module, be used for latching short-circuit signal output, switch control module is connected with latch module, for output switch cut-off signal when receiving short-circuit signal, controlled switch M is connected with switch control module, for cutoff circuit when receiving switch cut-off signal.
Wherein, battery module further comprises battery, the first end of inspection leakage resistance Rs is connected with the negative pole of battery, the minus earth of battery, the second end of inspection leakage resistance Rs connects the first end of controlled switch M, the second end of controlled switch M connects the first output PACK-of battery module, the control end connecting valve control module of controlled switch M, the second output PACK+ of battery module connects the positive pole of battery, the first output PACK-of battery module is used for being connected load with the second output PACK+, two inputs of short-circuit detecting module connect respectively the two ends of inspection leakage resistance Rs, short-circuit detecting module is for exporting different signals according to the current value that flows through inspection leakage resistance Rs, when the current value that flows through inspection leakage resistance Rs surpasses load current value, short-circuit detecting module output short-circuit signal, controlled switch M is its first end and the disconnection of the second end when receiving switch cut-off signal, so that loop disconnects.
Wherein, short-circuit detecting module comprises differential amplification unit and short circuit monitoring unit, differential amplification unit comprises operational amplifier A, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, short circuit monitoring unit comprises resistance R 5, resistance R 6 and triode Q1, the first end of the inverting input contact resistance R1 of operational amplifier A, the second end of resistance R 1 connects the first end of inspection leakage resistance Rs, the first end of the normal phase input end contact resistance R2 of operational amplifier A, the second end of resistance R 2 connects the second end of inspection leakage resistance Rs, the normal phase input end of the first end concatenation operation amplifier A of resistance R 3, the second end ground connection of resistance R 3, the output of the first end concatenation operation amplifier A of resistance R 4, the inverting input of the second end concatenation operation amplifier A of resistance R 4, the operating voltage termination operating voltage of operational amplifier A, the earth terminal ground connection of operational amplifier A, the output of the first end concatenation operation amplifier A of resistance R 5, the first end of the second end contact resistance R6 of resistance R 5, the second end ground connection of resistance R 6, the first end of the base stage contact resistance R6 of triode Q1, the second end of the emitter contact resistance R6 of triode Q1, the current collection of triode Q1 is the output of short-circuit detecting module very, short-circuit protection circuit also comprises resistance R 7, the first end of resistance R 7 connects operating voltage, the second end of resistance R 7 connects the output of short-circuit detecting module, resistance R 1, resistance R 2, resistance R 3, resistance R 4, when the resistance size of resistance R 5 and resistance R 6 is arranged to examine electric current on leakage resistance Rs and surpasses load current value, resistance R 6 both end voltage surpass the conducting voltage of triode Q1 just, so that short-circuit detecting module output low level signal when the short circuit of loop, while normally working in loop, export high level signal.
Wherein, latch module comprises inverter B1, inverter B2, diode D1, resistance R 8 and with door U1, the input of inverter B1 connects the output of short-circuit detecting module, the first end of the output contact resistance R8 of inverter B1, the second end of resistance R 8 connects the positive pole of diode D1, the negative pole of diode D1 connects the first input end with door U1, the second end of the input contact resistance R8 of inverter B2, the output of inverter B2 connects the second input with door U1, the output that is connected short-circuit detecting module with the second input of door U1, latch module receives after the low level signal of output of short-circuit detecting module, keep low level with the output of door U1, controlled switch M remains open.
Wherein, short-circuit protection circuit further comprises dormancy awakening module, and dormancy awakening module makes the dormancy of short-circuit detecting module while being used for waking short-circuit detecting module up and normally work in loop when the short circuit of loop.
Wherein, dormancy awakening module comprises NAND gate U2, triode Q2, inverter B3, inverter B4, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 1 and diode D2, the first end of capacitor C 1 connects the second end of inspection leakage resistance Rs, the first end of the second end contact resistance R9 of capacitor C 1, the first end of the second end contact resistance R10 of resistance R 9, the second end ground connection of resistance R 10, the first end of the base stage contact resistance R10 of triode Q2, the second end of the emitter contact resistance R10 of triode Q2, the second end of the collector electrode contact resistance R11 of triode Q2, the first end of resistance R 11 connects operating voltage, the second end of the second input contact resistance R11 of NAND gate U2, the second end of the input contact resistance R11 of inverter B3, the second end of resistance R 12 connects the output of inverter B3, the first end of resistance R 12 connects the positive pole of diode D2, the negative pole of diode D2 connects the first input end of NAND gate U2, the first end of the input contact resistance R12 of inverter B4, the output of inverter B4 connects the second input of NAND gate U2, the output of NAND gate U2 is the output of dormancy awakening module, the output of NAND gate U2 connects the Enable Pin of short-circuit detecting module, when dormancy awakening module input high level signal to Enable Pin when the short circuit of loop is waken short-circuit detecting module up and normally works in loop, input low level signal to Enable Pin makes the dormancy of short-circuit detecting module.
Wherein, controlled switch M is N channel field-effect pipe, and the source electrode of N channel field-effect pipe connects the second end of inspection leakage resistance Rs, and drain electrode connects the first output PACK-of battery module, the output of grid connecting valve control module.
Wherein, short-circuit protection circuit further comprises clamp circuit module, and clamp circuit module is for the first end that limits inspection leakage resistance Rs current potential over the ground.
Wherein, clamp circuit module comprises diode D3, diode D4, capacitor C 2 and resistance R 13, the negative pole of diode D3 connects the first end of inspection leakage resistance Rs, the second end of resistance R 13 connects the positive pole of diode D3, the first end ground connection of resistance R 13, the positive pole of diode D4 connects the first end of inspection leakage resistance Rs, the negative pole of diode D4 connects the second end of capacitor C 2, the first end ground connection of capacitor C 2, the negative pole of diode D4 connects the positive pole of diode D3, the negative pole of the cathode connecting diode D3 of diode D4.
Wherein, diode D3 and diode D4 are Schottky diode, unidirectional transient diode or voltage stabilizing didoe.
The invention has the beneficial effects as follows: the situation that is different from prior art; the present invention adopts the short-circuit detecting module of hardware controls mode to detect short circuit by arranging; by being set, latch module latchs short-circuit signal; by the way; can accelerate short-circuit protection speed, and can avoid can not latching because of short-circuit signal the misoperation causing.
Accompanying drawing explanation
Fig. 1 is the structural representation of the short-circuit protection circuit of prior art;
Fig. 2 is the structural representation of short-circuit protection circuit the first embodiment of the present invention;
Fig. 3 is the structural representation of short-circuit protection circuit the second embodiment of the present invention;
Fig. 4 is the structural representation of short-circuit protection circuit of the present invention the 3rd embodiment.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Refer to Fig. 2, Fig. 2 is the structural representation of short-circuit protection circuit the first embodiment of the present invention.In the present embodiment, short-circuit protection circuit comprises: battery module 11, short-circuit detecting module 12, latch module 13 and switch control module 14.
The first output PACK-of battery module 11 is used for being connected load (not shown) with the second output PACK+.Battery module 11 comprises: battery 111, inspection leakage resistance Rs and controlled switch M.Battery 111 minus earths, battery 111 positive poles meet the second output PACK+ of battery module 11 in succession.The first end S1 of inspection leakage resistance Rs connects the negative pole of battery 111, and the second end S2 of inspection leakage resistance Rs connects the first end of controlled switch M, and the second end of controlled switch M connects the first output PACK-of battery module 11.In the present embodiment, controlled switch M is preferably NMOS pipe (N-Mental-Oxide-Semiconductor, N channel field-effect pipe), the first end of controlled switch M is the source electrode of NMOS pipe, the second end is the drain electrode of NMOS pipe, control end is the grid of NMOS pipe, and in other embodiments, controlled switch M can be also other elements.
Short-circuit detecting module 12 is for detection of the whether short circuit of the formed loop of load (hereinafter to be referred as " loop ") of battery module 11 and battery module 11.Two inputs of short-circuit detecting module 12 connect respectively the two ends of inspection leakage resistance Rs, short-circuit detecting module 12 is for exporting different signals according to the current value that flows through inspection leakage resistance Rs, when the current value that flows through inspection leakage resistance Rs surpasses load current value, short-circuit detecting module 12 output short-circuit signals.Load current value is the standard of judgement loop short circuit, and the electric current that flows through inspection leakage resistance Rs surpasses load current value and is judged to be loop short circuit.
Particularly, short-circuit detecting module 12 comprises differential amplification unit 121 and short circuit monitoring unit 122.Differential amplification unit 121 is for amplifying the voltage at inspection leakage resistance Rs two ends and exporting short circuit monitoring unit 122 to, and short circuit monitoring unit 122 is for according to whether short circuit of the magnitude of voltage monitoring loop after amplifying.Differential amplification unit 121 comprises operational amplifier A, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, and short circuit monitoring unit 122 comprises resistance R 5, resistance R 6 and triode Q1.The first end of the inverting input contact resistance R1 of operational amplifier A, the second end of resistance R 1 connects the first end S1 of inspection leakage resistance Rs.The first end of the normal phase input end contact resistance R2 of operational amplifier A, the second end of resistance R 2 connects the second end S2 of inspection leakage resistance Rs, the normal phase input end of the first end concatenation operation amplifier A of resistance R 3, the second end ground connection of resistance R 3, the output of the first end concatenation operation amplifier A of resistance R 4, the inverting input of the second end concatenation operation amplifier A of resistance R 4, the operating voltage termination operating voltage VCC of operational amplifier A, the earth terminal ground connection of operational amplifier A, the output of the first end concatenation operation amplifier A of resistance R 5, the first end of the second end contact resistance R6 of resistance R 5, the second end ground connection of resistance R 6, the first end of the base stage contact resistance R6 of triode Q1, the second end of the emitter contact resistance R6 of triode Q1, the current collection of triode Q1 is the output of short-circuit detecting module 12 very.Short-circuit protection circuit also comprises resistance R 7, and the first end of resistance R 7 connects operating voltage VCC, and the second end connects the output of short-circuit detecting module 12.When the resistance size of resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6 is arranged so that the electric current on inspection leakage resistance Rs surpasses load current value, resistance R 6 both end voltage surpass the conducting voltage of triode Q1 just, so that short-circuit detecting module 12 output low level signal when the short circuit of loop, when short-circuit detecting module 12 is normally worked in loop, export high level signal, this low level signal is short-circuit signal.Should be understood that in other embodiments, short-circuit detecting module 12 can be also other structures, and correspondingly, short-circuit signal can be also high level signal.
Latch module 13 is connected with short-circuit detecting module 12 outputs, for latching short-circuit signal output.Latch module 13 comprises inverter B1, inverter B2, diode D1, resistance R 8 and with door U1, the input of inverter B1 connects the output of short-circuit detecting module 12, the first end of the output contact resistance R8 of inverter B1, the second end of resistance R 8 connects the positive pole of diode D1, the negative pole of diode D1 connects the first input end with door U1, the second end of the input contact resistance R8 of inverter B2, the output of inverter B2 connects the second input with door U1, the output that is connected short-circuit detecting module 12 with the second input of door U1, also be connected the first external signal RESET1 with the first input end of door U1.When latch module 13 receives the low level signal of output of short-circuit detecting module 12, keep low level with the output of door U1, controlled switch M remains open.Should be understood that in other embodiments, inverter B1, inverter B2, with door U1 also can be with the replacement of other logic combination circuits.The operation principle of latch module 13 is: when the short circuit of loop, short-circuit detecting module 12 output V1 are low level signal, and the output of inverter B1 is high level, and inverter B2 is output as low level, and U1 is output as low level signal with door.When short-circuit detecting module 12 output reverts to high level, inverter B2 is output as high level, and the output of diode D1 is low level, if therefore the first external signal RESET1 not access high level be still low level signal with door U1 output.
The input of switch control module 14 connects the output of latch module 13, connects the output with door U1.The output of the control end connecting valve control module 14 of controlled switch M.Switch control module 14, for when receiving the low level signal of output of latch module 13, is controlled controlled switch M and is turn-offed.Particularly, switch control module 14 is for converting the low level signal of latch module 13 outputs can control the switch cut-off signal that controlled switch M disconnects to, in the present embodiment, switch control module 14 is a level conversion element, in other embodiments, switch control module 14 can be also other elements.
The operation principle of short-circuit protection circuit is described below in conjunction with embodiment.
When normally work in loop, electric current on inspection leakage resistance Rs is less than rated current, the voltage at inspection leakage resistance Rs two ends is less, and the output of operational amplifier A voltage is over the ground less, and the undertension at R6 two ends is so that triode Q1 conducting, therefore the cut-off of triode Q1, V1 is high level, and when the first external signal RESET1 is high level, latch module 13 is output as high level, thereby switch control module 14 output high level make controlled switch M conducting, normally work in loop.When the short circuit of loop; the upper electric current of inspection leakage resistance Rs surpasses rated current; the voltage at inspection leakage resistance Rs two ends is larger; the output of operational amplifier A voltage is over the ground larger, and resistance R 6 both end voltage surpass the conducting voltage of triode Q1, V1 and ground GND conducting; be that short-circuit detecting module 12 is output as low level signal; latch module 13 is output as low level signal, and switch control module 14 output switch cut-off signals are controlled controlled switch M and disconnected, thus protection loop safety.Short-circuit detecting module 12, latch module 13, switch control module 14, all adopt hardware controls mode, can accelerate short-circuit protection speed.Latch module 13 can latch short-circuit signal, even the upper no current of inspection leakage resistance Rs flows through after controlled switch M disconnection, short-circuit detecting module 12 output current potentials recover high level, and controlled switch M can not recover conducting yet, thereby can more effective protective circuit.
The first embodiment of short-circuit protection circuit of the present invention adopts the short-circuit detecting module 12 of hardware controls mode to detect short circuit by arranging; by being set, latch module 13 latchs short-circuit signal; by the way; can accelerate short-circuit protection speed, and can avoid can not latching because of short-circuit signal the misoperation causing.
Refer to Fig. 3, Fig. 3 is the structural representation of short-circuit protection circuit the second embodiment of the present invention.The second embodiment of short-circuit protection circuit of the present invention has increased dormancy awakening module 15 on the first embodiment basis.Dormancy awakening module 15 makes 12 dormancy of short-circuit detecting module when waking short-circuit detecting module 12 up and normally working in loop when the short circuit of loop.
Dormancy awakening module 15 comprises NAND gate U2, triode Q2, inverter B3, inverter B4, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 1 and diode D2, the first end of capacitor C 1 connects the second end S2 of inspection leakage resistance Rs, the first end of the second end contact resistance R9 of capacitor C 1, the first end of the second end contact resistance R10 of resistance R 9, the second end ground connection of resistance R 10, the first end of the base stage contact resistance R10 of triode Q2, the second end of the emitter contact resistance R10 of triode Q2, the second end of the collector electrode contact resistance R11 of triode Q2, the first end of resistance R 11 connects operating voltage VCC, the second end of the second input contact resistance R11 of NAND gate U2, the second end of the input contact resistance R11 of inverter B3, the second end of resistance R 12 connects the output of inverter B3, the first end of resistance R 12 connects the positive pole of diode D2, the negative pole of diode D2 connects the first input end of NAND gate U2, the first end of the input contact resistance R12 of inverter B4, the output of inverter B4 connects the second input of NAND gate U2, the first input end of NAND gate U2 connects the second external signal terminal RESET2.The output of NAND gate U2 is the output of dormancy awakening module 15, and the output of NAND gate U2 connects the Enable Pin EN of short-circuit detecting module 12.In the present embodiment, the Enable Pin EN that the Enable Pin EN of short-circuit detecting module 12 is operational amplifier A, in other embodiments, the Enable Pin EN of short-circuit detecting module 12 also can be on other elements.
The operation principle of dormancy awakening module 15 is described below in conjunction with embodiment.
Dormancy awakening module 15 self is with the module for short-circuit detecting being comprised of capacitor C 1, resistance R 9, resistance R 10, triode Q2, resistance R 11.When normally work in loop, the base stage of triode Q2 and the voltage between emitter are less than conducting voltage, triode Q2 turn-offs, V2 place is high level, when the second external signal terminal RESET2 is high level, the output of NAND gate U2 is low level, and the Enable Pin EN of operational amplifier A is low level, operational amplifier A enters resting state, and short-circuit detecting module 12 enters resting state.Can reduce the power consumption of short-circuit protection circuit by the way.When the short circuit of loop, the instant electric potential of the first end of capacitor C 1 approximates the current potential of battery 111 positive poles, because the voltage at capacitor C 1 two ends cannot suddenly change, the instant electric potential of the second end of capacitor C 1 also approximates the current potential of battery 111 positive poles, and the upper dividing potential drop of R10 is greater than the conducting voltage of Q2, triode Q2 conducting, V2 place is low level, and the output of NAND gate U2 is high level, and the Enable Pin EN of operational amplifier A is high level, operational amplifier A is waken up, and short-circuit detecting module 12 is waken up.
The second embodiment of short-circuit protection circuit of the present invention adopts the short-circuit detecting module 12 of hardware controls mode to detect short circuit by arranging; by being set, latch module 13 latchs short-circuit signal; by being set, dormancy awakening module 15 wakes short-circuit detecting module 12 when the short circuit up; when normal work, make 12 dormancy of short-circuit detecting module; by the way; can accelerate short-circuit protection speed, and can avoid, because short-circuit signal can not latch the misoperation causing, can reducing the power consumption of circuit.
Refer to Fig. 4, Fig. 4 is the structural representation of short-circuit protection circuit of the present invention the 3rd embodiment.Short-circuit protection circuit of the present invention the 3rd embodiment has increased clamp circuit module 16 on the basis of the second embodiment.Clamp circuit module 16 is for the first end S1 that limits inspection leakage resistance Rs current potential over the ground.Clamp circuit module 16 comprises diode D3, diode D4, capacitor C 2 and resistance R 13, the negative pole of diode D3 connects the first end S1 of inspection leakage resistance Rs, the second end of resistance R 13 connects the positive pole of diode D3, the first end ground connection of resistance R 13, the positive pole of diode D4 connects the first end of inspection leakage resistance Rs, the negative pole of diode D4 connects the second end of capacitor C 2, the first end ground connection of capacitor C 2, the negative pole of diode D4 connects the positive pole of diode D3, the negative pole of the cathode connecting diode D3 of diode D4 in the present embodiment, diode D3 and diode D4 are Schottky diode, in other embodiments, diode D3 and the unidirectional transient diode of diode D4 or voltage stabilizing didoe.
The operation principle of clamp circuit module 16 is described below in conjunction with embodiment.
At loop transcient short circuit time, examine current potential and its second end S2 current potential approximately equal of the first end S1 of leakage resistance Rs, therefore the positive electrode potential of transcient short circuit time diode D4 is approximately equal to the positive electrode potential of battery 111, thereby diode D4 forward conduction diode D3 oppositely ends, again because transcient short circuit time capacitor C 2 both end voltage can not be suddenlyd change, therefore S1 place current potential is fast by diode D4, resistance R 13 GND that releases, thereby the first end S1 current potential clamper of inspection leakage resistance Rs is arrived to less amplitude, and then the current potential of order inspection leakage resistance Rs the second end S2 is also clamped to less amplitude through resistance R 2, the limit input voltage range of the current potential amplitude less-than operation amplifier A of input operational amplifier A after R3 dividing potential drop, therefore can avoid amplifier operation irregularity.
Capacitor C 2 is full of after electricity, and S1 place current potential continues by diode D4, resistance R 13 GND that releases, and before controlled switch M turn-offs, S1 place current potential is clamped at less amplitude always.When controlled switch M turn-offs, because electric current in discharge path (S1 → diode D4 → resistance R 13 → GND) can not suddenly change and examine the impact of the parasitic parameter going between between leakage resistance Rs first end S1 and GND, controlled switch M shutdown moment S1 place current potential is by decline higher value, thereby diode D4 oppositely ends and diode D3 forward conduction, it is same because the voltage at capacitor C 2 two ends can not suddenly change, GND and diode D3, the first end S1 of inspection leakage resistance Rs forms continuous current circuit, thereby the potential difference between S1 and GND is clamped to less amplitude fast, thereby the grid of controlled switch M and the voltage between source electrode are less than the cut-in voltage of controlled switch M always, can avoid controlled switch M to occur the phenomenon of secondary opening.
The 3rd embodiment of short-circuit protection circuit of the present invention adopts the short-circuit detecting module 12 of hardware controls mode to detect short circuit by arranging, by being set, latch module 13 latchs short-circuit signal, by being set, dormancy awakening module 15 wakes short-circuit detecting module 12 when the short circuit up, when normal work, make 12 dormancy of short-circuit detecting module, by clamp circuit module 16 is set, the current potential of inspection leakage resistance Rs first end S1 is clamped to less amplitude, by the way, can accelerate short-circuit protection speed, and can avoid can not latching because of short-circuit signal the misoperation causing, can reduce the power consumption of circuit, can avoid because of the excessive damage that causes operational amplifier A and controlled switch M of inspection leakage resistance Rs first end S1 current potential, can also prevent controlled switch M secondary opening.
The foregoing is only embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a short-circuit protection circuit, it is characterized in that, described short-circuit protection circuit comprises battery module, short-circuit detecting module, latch module and switch control module, described battery module comprises controlled switch M and inspection leakage resistance Rs, described short-circuit detecting module detects the whether short circuit of loop that the load of described battery module and described battery module form by described inspection leakage resistance Rs, and when short circuit output short-circuit signal, described latch module is connected with described short-circuit detecting module, be used for latching described short-circuit signal output, described switch control module is connected with described latch module, for output switch cut-off signal when receiving described short-circuit signal, described controlled switch M is connected with described switch control module, for disconnect described loop when receiving described switch cut-off signal.
2. short-circuit protection circuit according to claim 1, it is characterized in that, described battery module further comprises battery, the first end of described inspection leakage resistance Rs is connected with the negative pole of described battery, the minus earth of described battery, the second end of described inspection leakage resistance Rs connects the first end of described controlled switch M, the second end of described controlled switch M connects the first output PACK-of described battery module, the control end of described controlled switch M connects described switch control module, the second output PACK+ of described battery module connects the positive pole of described battery, the first output PACK-of described battery module is used for being connected described load with the second output PACK+, two inputs of described short-circuit detecting module connect respectively the two ends of described inspection leakage resistance Rs, described short-circuit detecting module is for exporting different signals according to the current value that flows through described inspection leakage resistance Rs, when the current value that flows through described inspection leakage resistance Rs surpasses load current value, described short-circuit detecting module is exported described short-circuit signal, described controlled switch M is its first end and the disconnection of the second end when receiving described switch cut-off signal, so that described loop disconnects.
3. short-circuit protection circuit according to claim 2, it is characterized in that, described short-circuit detecting module comprises differential amplification unit and short circuit monitoring unit, described differential amplification unit comprises operational amplifier A, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, described short circuit monitoring unit comprises resistance R 5, resistance R 6 and triode Q1, the inverting input of described operational amplifier A connects the first end of described resistance R 1, the second end of described resistance R 1 connects the first end of described inspection leakage resistance Rs, the normal phase input end of described operational amplifier A connects the first end of described resistance R 2, the second end of described resistance R 2 connects the second end of described inspection leakage resistance Rs, the first end of described resistance R 3 connects the normal phase input end of described operational amplifier A, the second end ground connection of described resistance R 3, the first end of described resistance R 4 connects the output of described operational amplifier A, the second end of described resistance R 4 connects the inverting input of described operational amplifier A, the operating voltage termination operating voltage of described operational amplifier A, the earth terminal ground connection of described operational amplifier A, the first end of described resistance R 5 connects the output of described operational amplifier A, the second end of described resistance R 5 connects the first end of described resistance R 6, the second end ground connection of described resistance R 6, the base stage of described triode Q1 connects the first end of described resistance R 6, the emitter of described triode Q1 connects the second end of described resistance R 6, the output of the very described short-circuit detecting module of the current collection of described triode Q1, described short-circuit protection circuit also comprises resistance R 7, the first end of described resistance R 7 connects described operating voltage, the second end of described resistance R 7 connects the output of described short-circuit detecting module, described resistance R 1, resistance R 2, resistance R 3, resistance R 4, described in when the resistance size of resistance R 5 and resistance R 6 is arranged so that electric current on described inspection leakage resistance Rs surpasses described load current value, resistance R 6 both end voltage surpass the conducting voltage of described triode Q1 just, so that described short-circuit detecting module output low level signal when the short circuit of described loop, when normally working, described loop exports high level signal.
4. short-circuit protection circuit according to claim 3, it is characterized in that, described latch module comprises inverter B1, inverter B2, diode D1, resistance R 8 and with door U1, the input of described inverter B1 connects the output of described short-circuit detecting module, the output of described inverter B1 connects the first end of described resistance R 8, the second end of described resistance R 8 connects the positive pole of described diode D1, the negative pole of described diode D1 connects first input end described and door U1, the input of described inverter B2 connects the second end of described resistance R 8, the output of described inverter B2 connects the second input described and door U1, the second input described and door U1 is connected the output of described short-circuit detecting module, described latch module receives after the low level signal of output of described short-circuit detecting module, output described and door U1 keeps low level, described controlled switch M remains open.
5. according to the short-circuit protection circuit described in claim 1 or 4; it is characterized in that; described short-circuit protection circuit further comprises dormancy awakening module, and described dormancy awakening module makes the dormancy of described short-circuit detecting module while being used for waking described short-circuit detecting module up and normally work in described loop when the short circuit of described loop.
6. short-circuit protection circuit according to claim 5, it is characterized in that, described dormancy awakening module comprises NAND gate U2, triode Q2, inverter B3, inverter B4, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 1 and diode D2, the first end of described capacitor C 1 connects the second end of described inspection leakage resistance Rs, the second end of described capacitor C 1 connects the first end of described resistance R 9, the second end of described resistance R 9 connects the first end of described resistance R 10, the second end ground connection of described resistance R 10, the base stage of described triode Q2 connects the first end of described resistance R 10, the emitter of described triode Q2 connects the second end of described resistance R 10, the collector electrode of described triode Q2 connects the second end of described resistance R 11, the first end of described resistance R 11 connects described operating voltage, the second input of described NAND gate U2 connects the second end of described resistance R 11, the input of described inverter B3 connects the second end of described resistance R 11, the second end of described resistance R 12 connects the output of described inverter B3, the first end of described resistance R 12 connects the positive pole of described diode D2, the negative pole of described diode D2 connects the first input end of described NAND gate U2, the input of described inverter B4 connects the first end of described resistance R 12, the output of described inverter B4 connects the second input of described NAND gate U2, the output of described NAND gate U2 is the output of described dormancy awakening module, the output of described NAND gate U2 connects the Enable Pin of described short-circuit detecting module, described dormancy awakening module when the short circuit of described loop input high level signal to described Enable Pin when waking described short-circuit detecting module up and normally working in described loop input low level signal to described Enable Pin make the dormancy of described short-circuit detecting module.
7. short-circuit protection circuit according to claim 2; it is characterized in that; described controlled switch M is N channel field-effect pipe; the source electrode of described N channel field-effect pipe connects the second end of described inspection leakage resistance Rs; drain electrode connects the first output PACK-of described battery module, and grid connects the output of described switch control module.
8. short-circuit protection circuit according to claim 5, is characterized in that, described short-circuit protection circuit further comprises clamp circuit module, and described clamp circuit module is for the first end that limits described inspection leakage resistance Rs current potential over the ground.
9. short-circuit protection circuit according to claim 8, it is characterized in that, described clamp circuit module comprises diode D3, diode D4, capacitor C 2 and resistance R 13, the negative pole of described diode D3 connects the first end of described inspection leakage resistance Rs, the second end of described resistance R 13 connects the positive pole of described diode D3, the first end ground connection of described resistance R 13, the positive pole of described diode D4 connects the first end of described inspection leakage resistance Rs, the negative pole of described diode D4 connects the second end of described capacitor C 2, the first end ground connection of described capacitor C 2, the negative pole of described diode D4 connects the positive pole of described diode D3, the positive pole of described diode D4 connects the negative pole of described diode D3.
10. short-circuit protection circuit according to claim 9, is characterized in that, described diode D3 and diode D4 are Schottky diode, unidirectional transient diode or voltage stabilizing didoe.
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| CN201310577425.4A CN104104067B (en) | 2013-04-12 | 2013-11-18 | Short circuit protection circuit |
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| CN2013101279718 | 2013-04-12 | ||
| CN201310127971 | 2013-04-12 | ||
| CN201310127971.8 | 2013-04-12 | ||
| CN201310577425.4A CN104104067B (en) | 2013-04-12 | 2013-11-18 | Short circuit protection circuit |
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| CN104104067B CN104104067B (en) | 2017-03-22 |
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| CN201320728314.4U Withdrawn - After Issue CN203674696U (en) | 2013-04-12 | 2013-11-18 | Short circuit protection circuit |
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| CN106681225A (en) * | 2017-02-06 | 2017-05-17 | 江苏顺达交通设施有限公司 | Urban road guardrail state monitoring device and monitoring method thereof |
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| CN110098648A (en) * | 2019-04-24 | 2019-08-06 | 青岛海洋科学与技术国家实验室发展中心 | Energy management system for Oceanic View sounding buoy |
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| CN115102532A (en) * | 2022-08-23 | 2022-09-23 | 宁波兴为汽车电子有限公司 | Short-circuit overcurrent protection circuit and method for high-side output of MOS (Metal oxide semiconductor) tube and vehicle |
| CN115102532B (en) * | 2022-08-23 | 2022-11-15 | 宁波兴为汽车电子有限公司 | Short-circuit overcurrent protection circuit and method for high-side output of MOS (Metal oxide semiconductor) tube and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203674696U (en) | 2014-06-25 |
| CN104104067B (en) | 2017-03-22 |
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