CN204243736U - A kind of battery overload and short-circuit protection circuit - Google Patents

A kind of battery overload and short-circuit protection circuit Download PDF

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Publication number
CN204243736U
CN204243736U CN201420724763.6U CN201420724763U CN204243736U CN 204243736 U CN204243736 U CN 204243736U CN 201420724763 U CN201420724763 U CN 201420724763U CN 204243736 U CN204243736 U CN 204243736U
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China
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resistance
control voltage
circuit
battery
control
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CN201420724763.6U
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Chinese (zh)
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刘爱国
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Wuhan Cintonle Power Supply Technology Co Ltd
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Wuhan Cintonle Power Supply Technology Co Ltd
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Abstract

The utility model discloses a kind of battery overload and short-circuit protection circuit, comprise battery discharge administrative unit and battery discharge protection unit, battery discharge administrative unit comprises control voltage generation unit and cell channel unit, control voltage generation unit connects battery, to produce the first control voltage and the second control voltage that control cell channel unit, cell channel unit connects the first control voltage, second control voltage, battery cathode, to connect with battery cathode with exporting under controlling in the first control voltage and the second control voltage, battery discharge protection unit comprises short-circuit protection sample circuit and control of discharge voltage generating unit, short-circuit protection sample circuit is serially connected with in cell channel unit to produce a sampling voltage, control of discharge voltage generating unit and short-circuit protection sample circuit are connected in parallel, to produce control of discharge voltage, it exports the switching tube connecting cell channel unit, the utility model effectively can improve the reliability that distribution automation terminal systems stay is powered.

Description

A kind of battery overload and short-circuit protection circuit
Technical field
The utility model relates to distribution automation remote terminal unit field, particularly relates to a kind of battery overload and short-circuit protection circuit of distribution automation remote terminal unit switch power module.
Background technology
Along with development social now, particularly require more and more higher in power industry to the continuity of power supply, therefore battery obtains as a kind of back-up source and applies very widely in distribution network automated field.But because common power module does not improve and reliable circuit overcurrent protection and short-circuit fault protection circuit for battery discharge loop; when there is battery discharge current fault; power supply and battery irrecoverability can be caused to damage, greatly reduce the reliability of distribution automation system.
Utility model content
For overcoming the deficiency that above-mentioned prior art exists, the object of the utility model is to provide a kind of battery overload and short-circuit protection circuit, export when overload current or short trouble appear in feeder ear in battery and pass through detect discharge loop electric current and export feeder ear voltage, battery output loop is cut off in quick response, the battery discharge control loop component damage that uncontrollable big current causes such as effectively to protect when overload current or short trouble appear in battery output, and battery output power supply can be recovered by normal running after failture evacuation, effectively improve distribution automation terminal systems stay power supply reliability.
For reaching above-mentioned and other object, the utility model proposes a kind of battery overload and short-circuit protection circuit, for being connected between battery and load, described circuit comprises battery discharge administrative unit and battery discharge protection unit, described battery discharge administrative unit comprises control voltage generation unit and cell channel unit, described control voltage generation unit connects described battery, to produce the first control voltage and the second control voltage that control described cell channel unit, described cell channel unit connects described first control voltage, second control voltage, described battery cathode, under controlling in described first control voltage and the second control voltage, output is connected with described battery cathode, described battery discharge protection unit comprises short-circuit protection sample circuit and control of discharge voltage generating unit, described short-circuit protection sample circuit is serially connected with in described cell channel unit to produce a sampling voltage, described control of discharge voltage generating unit and described short-circuit protection sample circuit are connected in parallel, to produce control of discharge voltage, it exports the switching tube connecting described cell channel unit.
Further, described control voltage generation unit comprises the first control voltage VA and produces circuit and the second control voltage VC generation circuit, described first control voltage VA produces circuit and connects between described anode and ground, to produce described first control voltage (VA), described second control voltage VC produces circuit and connects described anode and described first control voltage (VA), with described cell voltage for control voltage, control optocoupler break-make by comparator and produce described second control voltage (VC) by described first control voltage (VA).
Further, described first control voltage VA produces circuit and comprises resistance (R54), Zener diode (D11) and filter capacitor (C2), anode described in described resistance (R54) one termination, the other end connects for described first control voltage (VA) output with described Zener diode (D11) negative electrode, described Zener diode (D11) anode connects and exports ground, described filter capacitor (C2) and described Zener diode (D11) parallel connection.
Further, described first control voltage VA produces circuit and also comprises electric capacity (C1), and described electric capacity (C1) is connected to described anode and exports between ground and strobes.
Further, described second control voltage VC produces circuit and comprises resistance (R81, R92, R123, R79, R82, R89, R1, R80 and R131), comparator (U23A, U23B), diode (D19, D30), Zener diode (D10), filter capacitor (E15), optocoupler (U7, and switch (S4) U1), described resistance (R81) and the resistance (R92 be connected in series, R123) potential-divider network is formed, described resistance (R92) connects after connecting with resistance (R123) and exports ground, anode described in described resistance R81 mono-termination, the in-phase input end of comparator (U23B) described in another termination, described comparator (U23B) anti-phase input termination one reference voltage, described resistance (R79) is connected across described comparator (U23B) between in-phase input end and output, described comparator (U23B) exports diode described in termination (D19) anode, described diode (D19) negative electrode connects described resistance (R82), comparator (U23A) in-phase input end described in described resistance (R82) another termination and the described resistance (R89) be connected in parallel, one end of electric capacity (E15), described resistance (R89), another termination of electric capacity (E15) exports ground, described resistance (R131) and diode (D30), switch (S4) is connected successively and is attempted by described comparator (U23A) in-phase input end and exports between ground for test, reference voltage described in described comparator (U23A) anti-phase input termination, described comparator (U23A) exports resistance described in termination (R80), described resistance (R80) connects described optocoupler (U7) input side luminous tube anode, described optocoupler (U7) input side luminous tube negative electrode connects and exports ground, described anode is also by described resistance (R1) simultaneously, Zener diode (D10) is connected to described optocoupler (U1) input side luminous tube anode, described optocoupler (U1) input side luminous tube negative electrode connects and exports ground, described first control voltage (VA) passes through described optocoupler (U7) outlet side and described second control voltage (VC) of described optocoupler (U1) outlet side connection control output of cascade successively, described comparator (U23A, U23B) described first control voltage (VA) is connected.
Further, a switch (S3) is also connected in series between described second control voltage (VC) and described first control voltage (VA) for test.
Further, described reference voltage is produced by reference voltage generating circuit, described reference voltage generating circuit produces to comprise and is series at described anode and the resistance (R64) exported between ground and unijunction transistor (U16), anode described in the upper termination of described resistance (R64), exports described reference voltage in described resistance (R64) lower end.
Further, described cell channel unit comprises resistance (R40), switching tube (Q13, and be connected to switching tube Q13 Q14), divider resistance (the R31 of the control gate of Q14, R112, R32 and R35), described resistance (R40) one termination exports ground, its other end and described switching tube (Q13) drain-source pole, described short-circuit protection sample circuit, described switching tube (Q14) source-drain electrode is connected successively, and be finally connected to described battery cathode, described resistance (R31, R112) potential-divider network is formed, second control voltage (VC) described in the upper termination of described resistance (R31), its intermediate point connects described switching tube (Q13) control gate, switching tube (Q13) source electrode described in termination under described resistance (R112), described resistance (R32, R35) potential-divider network is formed, first control voltage (VA) described in the upper termination of described resistance (R32), its intermediate point connects described switching tube (Q14) control gate, switching tube (Q14) source electrode described in termination under described resistance (R35).
Further, described short-circuit protection sample circuit comprises a resistance (R113), and described resistance (R113) is serially connected with the ground wire side of the cell channel of described cell channel unit, to produce a sampling voltage.
Further, described control of discharge voltage generating unit comprises resistance (R130, R135, R136, R137, 138), electric capacity (C31, C32, and triode (Q12 C39), Q16, Q17), described electric capacity (C39, C31) lower end, described resistance (R136, R130) lower end, described triode (Q16, Q17) emitter is connected to described resistance (R113) right-hand member, described resistance (R135, R136) potential-divider network is formed, resistance R113 left end described in the upper termination of described resistance (R135), its intermediate point connects described triode (Q17) base stage, triode (Q17) emitter described in termination under described resistance (R136), described triode (Q17) collector electrode connects described resistance (R137), triode (Q16) collector electrode described in described resistance (R137) another termination, described triode (Q12) base stage and described resistance (R138), electric capacity (C32), described resistance (R138) and described electric capacity (C32) are connected in parallel to the emitter of described switching tube (Q13) control gate and described triode (Q12), collector electrode and described triode (Q16) base stage and the resistance in parallel (R130) of described triode (Q12), the upper end of electric capacity (C31) is connected, the described resistance (R138) be connected in parallel, the upper end of electric capacity (C32) is the output of described control of discharge voltage generating unit, and it is connected to the control gate of described switching tube (Q13).
Compared with prior art; a kind of battery overload of the utility model and short-circuit protection circuit; pass through detect discharge loop electric current and export feeder ear voltage when battery exports when overload current or short trouble appear in feeder ear; battery output loop is cut off in quick response; the battery discharge control loop component damage that uncontrollable big current causes such as effectively to protect when overload current or short trouble appear in battery output; and battery output power supply can be recovered by normal running after failture evacuation, effectively improve distribution automation terminal systems stay power supply reliability.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of a kind of battery overload of the utility model and short-circuit protection circuit;
Fig. 2 and Fig. 3 is the circuit structure diagram of a kind of battery overload of the utility model and short-circuit protection circuit preferred embodiment;
Fig. 4 is the circuit diagram of reference voltage generating circuit in the utility model preferred embodiment.
Embodiment
Below by way of specific instantiation and accompanying drawings execution mode of the present utility model, those skilled in the art can understand other advantage of the present utility model and effect easily by content disclosed in the present specification.The utility model is also implemented by other different instantiation or is applied, and the every details in this specification also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present utility model.
Fig. 1 is the circuit block diagram of a kind of battery overload of the utility model and short-circuit protection circuit, Fig. 2 and Fig. 3 is the circuit structure diagram of a kind of battery overload of the utility model and short-circuit protection circuit preferred embodiment.As Fig. 1, Fig. 2, shown in Fig. 3, a kind of battery overload of the utility model and short-circuit protection circuit, comprise battery discharge administrative unit 10 and battery discharge protection unit 20, battery discharge administrative unit 10 is connected between battery and load, battery discharge protection unit 20 connects battery discharge administrative unit 10, battery discharge administrative unit 10 comprises cell channel unit 101 and control voltage generation unit 102 two parts, control voltage generation unit 102 comprises the first control voltage VA and produces circuit 102a and the second control voltage VC generation circuit 102b, control voltage generation unit 102 is for generation of the first control voltage VA and the second control voltage VC that control cell channel unit 101, and wherein the first control voltage VA generation circuit 102a comprises resistance R54, Zener diode D11 and filter capacitor C2, the second control voltage VC produce circuit 102b (Fig. 3) and comprise resistance R81, R92, R123, R79, R82, R89, R1, R80, R131, comparator U23, diode D19 and, D30, Zener diode D10, filter capacitor E15, optocoupler U7, U1 and switch S 3, S4, it is with cell voltage Vo/B+ for control voltage, and control optocoupler break-make by comparator and produce the second control voltage VC by the first control voltage VA, cell channel unit 101 comprises the resistance R40 be connected in series, switching tube Q13, switching tube Q14 and be connected to switching tube Q13, the divider resistance R31 of the control gate of Q14, R112 and R32, R35, cell channel unit 101 will export ground GND and battery cathode B-connection under controlling at the first control voltage VA and the second control voltage VC, battery discharge protection unit 20 comprises short-circuit protection sample circuit 201 and control of discharge voltage generating unit 202, the resistance R113 be serially connected with in cell channel unit is short-circuit protection sampling, control of discharge voltage generating unit 202 comprises resistance R130, R135-138, electric capacity C31-32, C39 and triode Q12, Q16-17.
Termination battery positive Vo/B+ on the resistance R54 of the first control voltage VA generation circuit 102a, it is the first control voltage VA output that its lower end and Zener diode D11 negative electrode connect, Zener diode D11 anode connects and exports ground GND, filter capacitor C2 and Zener diode D11 is in parallel, and electric capacity C1 is connected to battery positive Vo/B+ and exports between ground GND and strobes, one of the resistance R40 of cell channel unit 101 termination exports ground GND, its other end and switching tube Q13 drain-source pole, resistance R113, switching tube Q14 source-drain electrode are connected successively, and be finally connected to battery cathode B-, resistance R31, R112 form potential-divider network, R31 upper termination second control voltage VC, its intermediate point connects switching tube Q13 control gate, termination switching tube Q13 source electrode under R112, resistance R32, R35 form potential-divider network, R32 upper termination first control voltage VA, its intermediate point connects switching tube Q14 control gate, termination switching tube Q14 source electrode under R35, the short-circuit protection sample circuit R113 of battery discharge protection unit 20 is serially connected with the ground wire side of cell channel, it produces a sampling voltage, according to current direction, R113 left end is positive right-hand member is negative, control of discharge voltage generating unit 202 is connected to resistance R113 two ends, i.e. terminating resistor R113 left end on resistance R135, electric capacity C39, C31 lower end, resistance R136, R130 lower end, NPN triode Q16-17 emitter is connected resistance R113 right-hand member, resistance R135, R136 forms potential-divider network, R135 upper terminating resistor R113 left end, its intermediate point connects triode Q17 base stage, termination triode Q17 emitter under R136, transistor collector connecting resistance R137, another termination triode of resistance R137 Q16 collector electrode, PNP triode Q12 base stage and resistance R138, electric capacity C32, resistance R138 and electric capacity C32 is connected in parallel to the emitter of switching tube Q13 control gate and NPN triode Q12, collector electrode and NPN triode Q16 base stage and the resistance R130 in parallel of NPN triode Q12, the upper end of electric capacity C31 is connected, output (the resistance R138 be connected in parallel of control of discharge voltage generating unit 202, the upper end of electric capacity C32) be connected to switching tube Q13 control gate, the resistance R81 that second control voltage VC produces circuit 102b and the resistance R92 be connected in series, R123 forms potential-divider network, resistance R92 and R123 connects after connecting and exports ground GND, termination battery positive VoB+ on resistance R81, the in-phase input end of its lower termination comparator U23B, comparator U23B inverting input reference voltage 2.5V3, this reference voltage 2.5V3 is produced by reference voltage generating circuit, resistance R79 is connected across between comparator U23B in-phase input end and output, comparator U23B exports terminating diode D19 anode, diode D19 negative electrode connecting resistance R82, another termination comparator of resistance R82 U23A in-phase input end and the resistance R89 be connected in parallel, the upper end of electric capacity E15, resistance R89, the lower termination of electric capacity E15 exports ground GND, resistance R131 and forward diode D30, switch S 4 is connected successively and is attempted by comparator U23A in-phase input end and exports between ground GND for test, comparator U23A inverting input reference voltage 2.5V3, comparator U23A output connecting resistance R80, resistance R80 connects optocoupler U7 input side luminous tube anode, optocoupler U7 input side luminous tube negative electrode connects and exports ground GND, battery positive Vo/B+ is also by resistance R1 simultaneously, Zener diode D10 is connected to optocoupler U1 input side luminous tube anode, optocoupler U1 input side luminous tube negative electrode connects and exports ground GND, first control voltage VA is connected to the second control voltage VC by the optocoupler U7 outlet side of cascade successively and optocoupler U1 outlet side, the second control voltage VC can be produced by the first control voltage VA like this when cell voltage is normal, a switch S 3 is also connected in series for test between the second control voltage VC and the first control voltage VA, comparator U23 (containing U23A and U23B) powers with the first control voltage VA.
Fig. 4 is the circuit diagram of reference voltage generating circuit in present pre-ferred embodiments.Wherein, resistance R64 and unijunction transistor U16 is composed in series reference voltage generating circuit, termination battery positive Vo/B+ on resistance R64, in resistance R64 lower end output reference voltage 2.5V3.
Continue referring to Fig. 2-Fig. 4, after switch " S3 (clicking switch just closed; unclamp and just disconnect) " is pressed, battery discharge current is initial by battery positive Vo/B+, form battery discharge current by resistance R40, switching tube Q13, resistance R113, switching tube Q14 and get back to battery negative terminal B-, because resistance R40, switching tube Q13, resistance R113, switching tube Q14 series impedance are less, so output port voltage slightly equals cell voltage.
When output end voltage is not lower than minimum battery power voltage, comparator U23A and U23B exports high level and maintains optocoupler U7 conducting, when output end voltage is not lower than resistance R1.Optocoupler U1 conducting is maintained during the minimum voltage that Zener diode D10 is arranged, then can produce the second control voltage VC by the first control voltage VA, the resistance by arranging resistance R31 and resistance R112 simultaneously after pressing switch S 3 just can allow the minimum cell voltage of Q13 constant conduction.
When there is short trouble or excess load electric current between output battery positive Vo/B+ and output ground GND, the electrical potential difference that R113 resistance is formed can trigger NPN triode Q17 conducting immediately, then triggers PNP triode Q12 and NPN triode Q16 conducting.Due to PNP triode Q12, grid 1 end of the circuit that NPN triode Q16 forms and switching tube Q13, source electrode 3 end pin is in parallel relationship, and PNP triode Q12 and NPN triode Q16 conducting overall presure drop and only have 1.4V, as long as therefore PNP triode Q12 and NPN triode Q16 conducting, so switching tube Q13 device gate source i.e. 1 pin and 3 pin both end voltage will be clamped to and only have 1.4V, turn-on condition due to switching tube Q13 is 1, more than 5V trigger voltage is had between 3 pin, so by arranging resistance R113, R135, R136, R137, R138 parameter, just can when there is short trouble or excess load electric current in powered battery output quick on-off switching tube Q13, thus disconnect battery discharge loop.
When there is short trouble or excess load electric current between battery output plus terminal Vo/B+ and output ground GND, output voltage can reduce fast, and now optocoupler U1 meeting turns off fast thus namely cut-off switch pipe Q13 disconnects current supply circuit.
The battery overload of this utility model and short-circuit protection circuit, by lot of experiment validation, when there is powered battery output short-circuit and excess load electric current, can turn off powered battery loop effectively fast and not damage battery discharge circuit device.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any those skilled in the art all without prejudice under spirit of the present utility model and category, can carry out modifying to above-described embodiment and change.Therefore, rights protection scope of the present utility model, should listed by claims.

Claims (10)

1. a battery overload and short-circuit protection circuit, for being connected between battery and load, it is characterized in that: described circuit comprises battery discharge administrative unit and battery discharge protection unit, described battery discharge administrative unit comprises control voltage generation unit and cell channel unit, described control voltage generation unit connects described battery, to produce the first control voltage and the second control voltage that control described cell channel unit, described cell channel unit connects described first control voltage, second control voltage, described battery cathode, under controlling in described first control voltage and the second control voltage, output is connected with described battery cathode, described battery discharge protection unit comprises short-circuit protection sample circuit and control of discharge voltage generating unit, described short-circuit protection sample circuit is serially connected with in described cell channel unit to produce a sampling voltage, described control of discharge voltage generating unit and described short-circuit protection sample circuit are connected in parallel, to produce control of discharge voltage, it exports the switching tube connecting described cell channel unit.
2. a kind of battery overload according to claim 1 and short-circuit protection circuit, it is characterized in that: described control voltage generation unit comprises the first control voltage (VA) and produces circuit and the second control voltage (VC) produces circuit, described first control voltage (VA) produces circuit and connects between described anode and ground, to produce described first control voltage (VA), described second control voltage (VC) produces circuit and connects described anode and described first control voltage (VA), with described cell voltage for control voltage, control optocoupler break-make by comparator and produce described second control voltage (VC) by described first control voltage (VA).
3. a kind of battery overload according to claim 2 and short-circuit protection circuit; it is characterized in that: described first control voltage (VA) produces circuit and comprises resistance (R54), Zener diode (D11) and filter capacitor (C2); anode described in described resistance (R54) one termination; the other end connects for described first control voltage (VA) output with described Zener diode (D11) negative electrode; described Zener diode (D11) anode connects and exports ground, described filter capacitor (C2) and described Zener diode (D11) parallel connection.
4. a kind of battery overload according to claim 3 and short-circuit protection circuit; it is characterized in that: described first control voltage (VA) produces circuit and also comprises electric capacity (C1), described electric capacity (C1) is connected to described anode and exports between ground and strobes.
5. a kind of battery overload according to claim 2 and short-circuit protection circuit, it is characterized in that: described second control voltage (VC) produces circuit and comprises resistance (R81, R92, R123, R79, R82, R89, R1, R80, R131), comparator (U23A, U23B), diode (D19, D30), Zener diode (D10), filter capacitor (E15), optocoupler (U7, and switch (S4) U1), described resistance (R81) and the resistance (R92 be connected in series, R123) potential-divider network is formed, described resistance (R92) connects after connecting with resistance (R123) and exports ground, anode described in described resistance (R81) one termination, the in-phase input end of comparator (U23B) described in another termination, described comparator (U23B) anti-phase input termination one reference voltage, described resistance (R79) is connected across described comparator (U23B) between in-phase input end and output, described comparator (U23B) exports diode described in termination (D19) anode, described diode (D19) negative electrode connects described resistance (R82), comparator (U23A) in-phase input end described in described resistance (R82) another termination and the described resistance (R89) be connected in parallel, one end of electric capacity (E15), described resistance (R89), another termination of electric capacity (E15) exports ground, described resistance (R131) and diode (D30), switch (S4) is connected successively and is attempted by described comparator (U23A) in-phase input end and exports between ground for test, reference voltage described in described comparator (U23A) anti-phase input termination, described comparator (U23A) exports resistance described in termination (R80), described resistance (R80) connects described optocoupler (U7) input side luminous tube anode, described optocoupler (U7) input side luminous tube negative electrode connects and exports ground, described anode is also by described resistance (R1) simultaneously, Zener diode (D10) is connected to described optocoupler (U1) input side luminous tube anode, described optocoupler (U1) input side luminous tube negative electrode connects and exports ground, described first control voltage (VA) passes through described optocoupler (U7) outlet side and described second control voltage (VC) of described optocoupler (U1) outlet side connection control output of cascade successively, described comparator (U23A, U23B) described first control voltage (VA) is connected.
6. a kind of battery overload according to claim 5 and short-circuit protection circuit, is characterized in that: be also connected in series a switch (S3) between described second control voltage (VC) and described first control voltage (VA) for test.
7. a kind of battery overload according to claim 5 and short-circuit protection circuit; it is characterized in that: described reference voltage is produced by reference voltage generating circuit; described reference voltage generating circuit produces to comprise and is series at described anode and the resistance (R64) exported between ground and unijunction transistor (U16); anode described in the upper termination of described resistance (R64), exports described reference voltage in described resistance (R64) lower end.
8. a kind of battery overload according to claim 1 and short-circuit protection circuit, it is characterized in that: described cell channel unit comprises resistance (R40), switching tube (Q13, and be connected to switching tube (Q13 Q14), divider resistance (the R31 of control gate Q14), R112, R32, R35), described resistance (R40) one termination exports ground, its other end and described switching tube (Q13) drain-source pole, described short-circuit protection sample circuit, described switching tube (Q14) source-drain electrode is connected successively, and be finally connected to described battery cathode, described resistance (R31, R112) potential-divider network is formed, second control voltage (VC) described in the upper termination of described resistance (R31), its intermediate point connects described switching tube (Q13) control gate, switching tube (Q13) source electrode described in termination under described resistance (R112), described resistance (R32, R35) potential-divider network is formed, first control voltage (VA) described in the upper termination of described resistance (R32), its intermediate point connects described switching tube (Q14) control gate, switching tube (Q14) source electrode described in termination under described resistance (R35).
9. a kind of battery overload according to claim 8 and short-circuit protection circuit; it is characterized in that: described short-circuit protection sample circuit comprises a resistance (R113); described resistance (R113) is serially connected with the ground wire side of the cell channel of described cell channel unit, to produce a sampling voltage.
10. a kind of battery overload according to claim 9 and short-circuit protection circuit, is characterized in that: described control of discharge voltage generating unit comprises resistance (R130, R135, R136, R137, 138), electric capacity (C31, C32, and triode (Q12 C39), Q16, Q17), described electric capacity (C39, C31) lower end, described resistance (R136, R130) lower end, described triode (Q16, Q17) emitter is connected to described resistance (R113) right-hand member, described resistance (R135, R136) potential-divider network is formed, resistance R113 left end described in the upper termination of described resistance (R135), its intermediate point connects described triode (Q17) base stage, triode (Q17) emitter described in termination under described resistance (R136), described triode (Q17) collector electrode connects described resistance (R137), triode (Q16) collector electrode described in described resistance (R137) another termination, described triode (Q12) base stage and described resistance (R138), electric capacity (C32), described resistance (R138) and described electric capacity (C32) are connected in parallel to the emitter of described switching tube (Q13) control gate and described triode (Q12), collector electrode and described triode (Q16) base stage and the resistance in parallel (R130) of described triode (Q12), the upper end of electric capacity (C31) is connected, the described resistance (R138) be connected in parallel, the upper end of electric capacity (C32) is the output of described control of discharge voltage generating unit, and it is connected to the control gate of described switching tube (Q13).
CN201420724763.6U 2014-11-27 2014-11-27 A kind of battery overload and short-circuit protection circuit Expired - Fee Related CN204243736U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787654A (en) * 2016-12-26 2017-05-31 厦门著赫电子科技有限公司 The circuit structure of Switching Power Supply quick closedown output voltage after a kind of AC dump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787654A (en) * 2016-12-26 2017-05-31 厦门著赫电子科技有限公司 The circuit structure of Switching Power Supply quick closedown output voltage after a kind of AC dump
CN106787654B (en) * 2016-12-26 2023-06-20 厦门著赫电子科技有限公司 Circuit structure for switching power supply to rapidly shut off output voltage after alternating current power failure

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