CN208638021U - Battery output overcurrent short circuit fast protection circuit - Google Patents
Battery output overcurrent short circuit fast protection circuit Download PDFInfo
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- 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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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
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.
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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ID=65738278
Family Applications (1)
| 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)
| 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 |
-
2018
- 2018-07-18 CN CN201821153248.1U patent/CN208638021U/en active Active
Cited By (1)
| 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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