CN208638021U - Battery output overcurrent short circuit fast protection circuit - Google Patents

Battery output overcurrent short circuit fast protection circuit Download PDF

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Publication number
CN208638021U
CN208638021U CN201821153248.1U CN201821153248U CN208638021U CN 208638021 U CN208638021 U CN 208638021U CN 201821153248 U CN201821153248 U CN 201821153248U CN 208638021 U CN208638021 U CN 208638021U
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resistance
comparator
oxide
semiconductor
metal
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CN201821153248.1U
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Chinese (zh)
Inventor
胡汉平
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Nanjing Pengtu Power Supply Co Ltd
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Nanjing Pengtu Power Supply Co Ltd
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Abstract

The utility model discloses a kind of battery output overcurrent short circuit fast protection circuit, the reverse input end of the comparator is connected by resistance R2 with the movable contact of adjustable potentiometer;One fixed contact ground connection of adjustable potentiometer, another fixed contact meet voltage VCC;The ground terminal of the comparator is grounded;The power supply termination voltage VCC of the comparator;The output end of the comparator is connected with the anode of diode D1, the one end resistance R5 respectively;In another base stage for terminating at triode Q1 of resistance R5, the negative terminal of diode D1 is connected by resistance R4 with the positive input of comparator;The positive input of the comparator is grounded after also passing through resistance R3, resistance R1;The collector of triode Q1 is connected with the pole G of metal-oxide-semiconductor, and the emitter of triode Q1 accesses the input terminal of resistance R1 after being connected with the pole S of metal-oxide-semiconductor.The utility model simple structure, it is easy to use, it is easy to maintain.

Description

Battery output overcurrent short circuit fast protection circuit
Technical field
The utility model relates to a kind of battery output overcurrent short circuit fast protection circuits, belong to secondary battery protection circuit skill Art field.
Background technique
Currently, needing to provide uninterrupted electric power using battery in many applications, due in battery itself Hinder it is relatively low, in the case where there is abnormal short-circuit or overcurrent in subsequent equipment, it will there is very big electric current to flow through route, when short-circuit The heat or spark of generation easily cause fire or expand the damage range of equipment, while also can cause to damage to battery itself Evil, it is therefore necessary to be protected in the case where electrical equipment is abnormal short circuit or overcurrent condition.
Conventional protection circuit is to seal in a fuse in the loop, but fuse itself is fused by overcurrent and heat To realize that protection, fusing protect speed not fast enough with long hysteresis quality.In addition, due to fuse itself have from Property is dissipated, the difference in size of blowout current is also larger, and secondly fuse is disposable device, has to replace after fusing, after being Continuous circuit resumes work and makes troubles.
Based on the above circumstances, this overcurrent, short-circuit fast protection circuit are devised, can voluntarily restore, there is very high reality With value.
Utility model content
Purpose: in order to overcome the deficiencies in the prior art, it is short that the utility model provides a kind of battery output overcurrent Road fast protection circuit.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the utility model is:
A kind of battery output overcurrent short circuit fast protection circuit, comprising: comparator, metal-oxide-semiconductor, the comparator it is reversed Input terminal is connected by resistance R2 with the movable contact of adjustable potentiometer;One fixed contact ground connection of adjustable potentiometer, another is fixed Contact meets voltage VCC;The ground terminal of the comparator is grounded;The power supply termination voltage VCC of the comparator;The comparator Output end is connected with the anode of diode D1, the one end resistance R5 respectively;Another base stage for terminating at triode Q1 of resistance R5 On, the negative terminal of diode D1 is connected by resistance R4 with the positive input of comparator;The positive input of the comparator Also by being grounded after resistance R3, resistance R1;The collector of triode Q1 is connected with the pole G of metal-oxide-semiconductor, the emitter of triode Q1 The input terminal of resistance R1 is accessed after being connected with the pole S of metal-oxide-semiconductor.
Preferably, further includes: zener diode DW1 is connected with pressure stabilizing two between the pole G and the pole S of the metal-oxide-semiconductor Pole pipe DW1.
Preferably, further includes: the pole G of resistance R6, the metal-oxide-semiconductor are also connected with resistance R6.
Preferably, the comparator uses LM2904.
Preferably, the metal-oxide-semiconductor uses NMOS tube.
Preferably, the triode Q1 uses S8050.
The utility model has the advantages that battery output overcurrent short circuit fast protection circuit provided by the utility model can when circuit is normal Guarantee that electrical equipment works normally;When circuit abnormality, electrical equipment can be protected without disturbance, and after circuit recovery, circuit is certainly It is dynamic to reset, and without maintenance.The design simple structure, it is easy to use, it is easy to maintain.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of battery output overcurrent short circuit fast protection circuit, comprising: 1 comparator is main controller Part, in addition also R1 current sampling resistor 1 and resistance R2, R3, R4, R5, R6 each 1, metal-oxide-semiconductor field effect transistor 1, small-power three Pole pipe 1, zener diode 1, general-purpose diode 1, adjustable potentiometer 1.
The movable contact of adjustable potentiometer W1 connects in one end of resistance R2,2 pins of another termination comparator of R2.Adjustable electric The one of fixed contact ground connection of position device, another fixed contact connect on voltage VCC.1 pin of comparator connects in resistance simultaneously One end of R5 and the anode of general-purpose diode D1, in another base stage for terminating at triode Q1 of R5, the negative terminal connecting resistance R4 of D1 Wherein one end, on another 3 pins for terminating at comparator of R4.Resistance R3 wherein one termination comparator 3 pins, the other end Connect the input terminal of R1, the input of R1 terminate at the S of metal-oxide-semiconductor extremely on, another foot of R1 connects the ground of battery, and the pole D of metal-oxide-semiconductor is made It is used for the ground of electrical equipment.DW1 is just terminating at the S of metal-oxide-semiconductor extremely above, and negative terminal meets the G of metal-oxide-semiconductor extremely above;The G of metal-oxide-semiconductor Pole is also connected with R6.
Embodiment 1:
In use, circuit powers on, the anode of battery provides a high voltage to the grid of metal-oxide-semiconductor Q2 by resistance R6, After Q2 conducting, electric current reaches the cathode of battery by fuse F1, electrical equipment, Q2, resistance R1, and electrical equipment starts normally Work, zener diode DW1 limit the operating voltage of Q2 grid, protect the not breakdown damage of Q2.
Voltage VCC provides stable electric power to comparator U1, and the 2 pin reverse input ends of U1 pass through potentiometer W1, resistance R2 obtains a positive voltage, and 3 pins of U1 are grounded by R3 keeps ground potential, and 2 pin voltages of U1 are greater than 3 pins, and the 1 of U1 is drawn The low level of foot output end output reaches the base stage of triode Q1 by resistance R5, makes Q1 stopping.
The electric current for flowing through the resistance R1 of current sampling resistor generates the negative right positive voltage signal in left side, when normal work, This positive voltage is less than the voltage of 2 pins of U1, and 1 pin of U1 remains low level.
When electrical equipment is abnormal short circuit or electric current is more than setting value, the voltage above R1 rises, this voltage is logical 3 pins that R3 reaches U1 are crossed, 3 pin voltages are once more than the voltage of 2 pins setting, and comparator will invert, and the 1 of U1 is drawn Foot, which exports high level, by R5 is connected Q1, Q2 grid voltage is shorted to ground by Q1, and Q2 stopping exports.The 1 of U1 simultaneously The high level of pin output feeds back 3 pins to U1 by diode D1, resistance R4, remains 3 pins and is higher than 2 pins Voltage, circuit is in and is locked and closed state, and until power down restarts, circuit resumes work.
The size of protective current can adjust setting by potentiometer W1.
The above is only the preferred embodiment of the utility model, it should be pointed out that: for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and Retouching also should be regarded as the protection scope of the utility model.

Claims (6)

1. a kind of battery output overcurrent short circuit fast protection circuit, comprising: comparator, metal-oxide-semiconductor, it is characterised in that: the ratio Reverse input end compared with device is connected by resistance R2 with the movable contact of adjustable potentiometer;One fixed contact of adjustable potentiometer connects Ground, another fixed contact meet voltage VCC;The ground terminal of the comparator is grounded;The power supply termination voltage VCC of the comparator; The output end of the comparator is connected with the anode of diode D1, the one end resistance R5 respectively;The another of resistance R5 terminates at three In the base stage of pole pipe Q1, the negative terminal of diode D1 is connected by resistance R4 with the positive input of comparator;The comparator Positive input also pass through resistance R3, resistance R1 after be grounded;The collector of triode Q1 is connected with the pole G of metal-oxide-semiconductor, three poles The emitter of pipe Q1 accesses the input terminal of resistance R1 after being connected with the pole S of metal-oxide-semiconductor.
2. battery output overcurrent short circuit fast protection circuit according to claim 1, it is characterised in that: further include: it is steady Diode DW1 is pressed, is connected with zener diode DW1 between the pole G and the pole S of the metal-oxide-semiconductor.
3. battery output overcurrent short circuit fast protection circuit according to claim 1, it is characterised in that: further include: electricity R6 is hindered, the pole G of the metal-oxide-semiconductor is also connected with resistance R6.
4. battery output overcurrent short circuit fast protection circuit according to claim 1, it is characterised in that: the comparator Using LM2904.
5. battery output overcurrent short circuit fast protection circuit according to claim 1, it is characterised in that: the metal-oxide-semiconductor Using NMOS tube.
6. battery output overcurrent short circuit fast protection circuit according to claim 1, it is characterised in that: the triode Q1 uses S8050.
CN201821153248.1U 2018-07-18 2018-07-18 Battery output overcurrent short circuit fast protection circuit Active CN208638021U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821153248.1U CN208638021U (en) 2018-07-18 2018-07-18 Battery output overcurrent short circuit fast protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821153248.1U CN208638021U (en) 2018-07-18 2018-07-18 Battery output overcurrent short circuit fast protection circuit

Publications (1)

Publication Number Publication Date
CN208638021U true CN208638021U (en) 2019-03-22

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Application Number Title Priority Date Filing Date
CN201821153248.1U Active CN208638021U (en) 2018-07-18 2018-07-18 Battery output overcurrent short circuit fast protection circuit

Country Status (1)

Country Link
CN (1) CN208638021U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111048858A (en) * 2019-12-25 2020-04-21 浙江大学昆山创新中心 Multifunctional voltage detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111048858A (en) * 2019-12-25 2020-04-21 浙江大学昆山创新中心 Multifunctional voltage detection circuit

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