CN205355798U - Over -voltage and over -current protection circuit - Google Patents
Over -voltage and over -current protection circuit Download PDFInfo
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- CN205355798U CN205355798U CN201521135295.XU CN201521135295U CN205355798U CN 205355798 U CN205355798 U CN 205355798U CN 201521135295 U CN201521135295 U CN 201521135295U CN 205355798 U CN205355798 U CN 205355798U
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Abstract
The utility model provides an over -voltage and over -current protection circuit, relates to circuit technical field, and that solve is the technical problem of power control. This circuit includes that battery, low -pass filtering unit, excessive pressure overflow detecting element, electric source channel switch element, the positive pole of low -pass filtering unit's input termination battery, low -pass filtering unit's output overflows detecting element through the pressure and receives electric source channel switch element, and the output of electric source channel switch element connects the load. The utility model provides a circuit, overcurrent protection threshold values and overvoltage protection threshold values can set up in a flexible way.
Description
Technical field
This utility model relates to circuit engineering, particularly relates to the technology of a kind of over-voltage over-current protection circuit.
Background technology
Vehicular accumulator cell is except powering for vehicle-mounted ECU; power sometimes also to radio, the outside peripheral hardware such as photographic head, externally connected with display screen; in order to avoid these by the battery-powered peripheral hardware of vehicular electricity storage be short-circuited fault time damage vehicle-mounted ECU and Vehicular accumulator cell, it is necessary to protection circuit is set on automobile.Traditional protection main circuit to have following three kinds of schemes: 1) adopting the high-power FET with overcurrent protection function, the threshold values that the shortcoming of the program is overcurrent protection can not be arranged flexibly, and does not have the function of overvoltage protection；2) current-limiting circuit that two audions and a sampling resistor are constituted is adopted; the BE knot of one of them audion is used for current limliting, and the shortcoming of the program is can only current limliting, it does not have closing control circuit; and cut-off current has relatively larger change along with the change of temperature, and there is no over-voltage protecting function；3) adopting IC chip, the shortcoming of the program is relatively costly.
Utility model content
For the defect existed in above-mentioned prior art; it is low that technical problem to be solved in the utility model is to provide a kind of cost; overcurrent protection threshold values and overvoltage protection threshold values can be arranged flexibly, and can close the over-voltage over-current protection circuit of power control circuit after mistake stream voluntarily.
In order to solve above-mentioned technical problem, a kind of over-voltage over-current protection circuit provided by the utility model, it is characterised in that: include accumulator, low-pass filter unit, over-voltage and over-current detection unit, power channel switch element；
Described over-voltage and over-current detection unit includes the first audion, the 3rd audion, the 4th audion, the 5th audion, Zener diode, the 4th resistance, the 7th resistance, the 8th resistance；
The positive pole of the input termination accumulator of described low-pass filter unit, the outfan of low-pass filter unit receives the emitter stage of the 3rd audion through the 8th resistance, and the emitter stage of the 4th audion is received by the 4th resistance, the base stage of the 3rd audion concatenates with the base stage of the 4th audion, and with the collector series connection of the 3rd audion, the emitter stage of the first audion received by the colelctor electrode of the 3rd audion, and the colelctor electrode of the 4th audion is received through the 7th resistance, the base stage of the first audion received by the colelctor electrode of the 4th audion, the emitter stage of the first audion received by the outfan of described low-pass filter unit, the plus earth of Zener diode, the negative electrode of Zener diode receives the colelctor electrode of the first audion, the base stage of the 5th audion received by the colelctor electrode of the first audion；
Described power channel switch element includes field effect transistor, the second audion, the first self-locking resistance, the second self-locking resistance, and for exporting the controller of control signal；The base stage of the second audion received by the control signal outfan of described controller, and the drain electrode of field effect transistor is received successively through the second self-locking resistance, the first self-locking resistance, the grounded emitter of the second audion, the colelctor electrode of the second audion receives the grid of field effect transistor and the colelctor electrode of the 3rd audion, the source electrode of field effect transistor receives the emitter stage of the 5th audion and the emitter stage of the 3rd audion, and the grid of field effect transistor received by the colelctor electrode of the 5th audion.
Further, described low-pass filter unit includes filter unit outfan, filter inductance, the first filter resistance, the second filter resistance, filter capacitor；
The positive pole of described accumulator filtered inductance successively, the first filter resistance receive filter unit outfan, and described filter unit outfan receives ground through the second filter resistance, filter capacitor successively.
Further, also including trigger element, described trigger element includes the 6th audion, the first trigger resistance, the second trigger resistance, the 3rd trigger resistance；The base stage of described 6th audion receives the colelctor electrode of the 5th audion through the first trigger resistance, and receive ground through the second trigger resistance, the emitter stage of the 6th audion receives ground, and the control signal outfan of controller received successively by the colelctor electrode of the 6th audion through the 3rd trigger resistance, the second self-locking resistance.
The over-voltage over-current protection circuit that this utility model provides; the threshold values of overcurrent protection and the threshold values of overvoltage protection can be adjusted easily by the 4th resistance, the 7th resistance, the 8th resistance, Zener diode; therefore overcurrent protection threshold values and overvoltage protection threshold values can be arranged flexibly; and power control circuit can be closed voluntarily after crossing stream; and simple in construction, cost is low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the over-voltage over-current protection circuit of this utility model embodiment.
Detailed description of the invention
Illustrate embodiment of the present utility model is described in further detail below in conjunction with accompanying drawing; but the present embodiment is not limited to this utility model; every employing analog structure of the present utility model and similar change thereof; all should listing protection domain of the present utility model in, the pause mark in this utility model all represents the relation of sum.
As it is shown in figure 1, a kind of over-voltage over-current protection circuit that this utility model embodiment provides, it is characterised in that: include accumulator V2, low-pass filter unit, over-voltage and over-current detection unit, power channel switch element, trigger element；
Described low-pass filter unit includes filter unit outfan X1, filter inductance L1, the first filter resistance R2, the second filter resistance R3, filter capacitor C1；
The positive pole of described accumulator V2 filtered inductance L1 successively, the first filter resistance R2 receive filter unit outfan X1, and described filter unit outfan X1 receives ground through the second filter resistance R3, filter capacitor C1 successively；
Described over-voltage and over-current detection unit includes the first audion Q1, the 3rd audion Q3, the 4th audion Q4, the 5th audion Q5, Zener diode D9, the 4th resistance R4, the 7th resistance R7, the 8th resistance R8；
Described filter unit outfan X1 receives the emitter stage of the 3rd audion Q3 through the 8th resistance R8, and the emitter stage of the 4th audion Q4 is received by the 4th resistance R4, the base stage of the 3rd audion Q3 concatenates with the base stage of the 4th audion Q4, and with the collector series connection of the 3rd audion Q3, the emitter stage of the first audion Q1 received by the colelctor electrode of the 3rd audion Q3, and the colelctor electrode of the 4th audion Q4 is received through the 7th resistance R7, the base stage of the first audion Q1 received by the colelctor electrode of the 4th audion Q4, described filter unit outfan X1 receives the emitter stage of the first audion Q1, the plus earth of Zener diode D9, the negative electrode of Zener diode D9 receives the colelctor electrode of the first audion Q1, the base stage of the 5th audion Q5 received by the colelctor electrode of the first audion Q1；
Described power channel switch element includes field effect transistor M1, the second audion Q2, the first self-locking resistance R11, the second self-locking resistance R19, and for exporting the controller V1 of control signal；The base stage of the second audion Q2 received by the control signal outfan of described controller V1, and the drain electrode of field effect transistor M1 is received successively through the second self-locking resistance R19, the first self-locking resistance R11, the grounded emitter of the second audion Q2, the colelctor electrode of the second audion Q2 receives the grid of field effect transistor M1 and the colelctor electrode of the 3rd audion Q3, the source electrode of field effect transistor M1 receives the emitter stage of the 5th audion Q5 and the emitter stage of the 3rd audion Q3, and the grid of field effect transistor M1 received by the colelctor electrode of the 5th audion Q5；
Described trigger element includes the 6th audion Q6, the first trigger resistance R12, the second trigger resistance R13, the 3rd trigger resistance R14；The base stage of described 6th audion Q6 receives the colelctor electrode of the 5th audion Q5 through the first trigger resistance R12, and receive ground through the second trigger resistance R13, the emitter stage of the 6th audion Q6 receives ground, and the control signal outfan of controller V1 received successively by the colelctor electrode of the 6th audion Q6 through the 3rd trigger resistance R14, the second self-locking resistance R19.
This utility model embodiment can regulate the threshold values of overcurrent protection easily by adjustment the 4th resistance R4, the 7th resistance R7, the 8th resistance R8; by selecting the model of Zener diode D9 can regulate the threshold values of overvoltage protection easily; the output of controller V1 should be set to pulsed output; such as first 20 milliseconds is high level; it is high resistant afterwards; after overcurrent protection occurs, hardware circuit closes flash power control circuit voluntarily.
The operation principle of this utility model embodiment is as follows:
As it is shown in figure 1, R18 is load resistance, C5 is load capacitance, and R20 is the direct current equiva lent impedance of load capacitance；First self-locking resistance R11, the second self-locking resistance R19, the second audion Q2 constitute self-locking circuit；
After controller V1 output continues the high level of 20 milliseconds, field effect transistor M1 turns on, and maintains conducting by self-locking circuit, otherwise then ends；Within controller V1 opens 20 milliseconds, when the electric current flowing through the 8th resistance R8 continues to increase, the electric current flowing through the 7th resistance R7 also increases as, after increasing to the first audion Q1 and diode D5 conducting, 5th audion Q5 and diode D1 conducting, the current constant flowing through field effect transistor M1 is (Vbe (Q1)+Vr (D5))/R7* (R21/R8)；
Having served as stream and occurred after controller V1 opens 20 milliseconds, the 6th audion Q6 conducting, the output of trigger element makes the second audion Q2 base stage be low level, now diode D2 cut-off, and the second audion Q2 cut-off, field effect transistor M1 ends；
When the voltage of accumulator V2 more than 18 volts time, the 5th audion Q5 and Zener diode D9 conducting, now diode D1 conducting, field effect transistor M1 end.
Claims (3)
1. an over-voltage over-current protection circuit, it is characterised in that: include accumulator, low-pass filter unit, over-voltage and over-current detection unit, power channel switch element；
Described over-voltage and over-current detection unit includes the first audion, the 3rd audion, the 4th audion, the 5th audion, Zener diode, the 4th resistance, the 7th resistance, the 8th resistance；
The positive pole of the input termination accumulator of described low-pass filter unit, the outfan of low-pass filter unit receives the emitter stage of the 3rd audion through the 8th resistance, and the emitter stage of the 4th audion is received by the 4th resistance, the base stage of the 3rd audion concatenates with the base stage of the 4th audion, and with the collector series connection of the 3rd audion, the emitter stage of the first audion received by the colelctor electrode of the 3rd audion, and the colelctor electrode of the 4th audion is received through the 7th resistance, the base stage of the first audion received by the colelctor electrode of the 4th audion, the emitter stage of the first audion received by the outfan of described low-pass filter unit, the plus earth of Zener diode, the negative electrode of Zener diode receives the colelctor electrode of the first audion, the base stage of the 5th audion received by the colelctor electrode of the first audion；
Described power channel switch element includes field effect transistor, the second audion, the first self-locking resistance, the second self-locking resistance, and for exporting the controller of control signal；The base stage of the second audion received by the control signal outfan of described controller, and the drain electrode of field effect transistor is received successively through the second self-locking resistance, the first self-locking resistance, the grounded emitter of the second audion, the colelctor electrode of the second audion receives the grid of field effect transistor and the colelctor electrode of the 3rd audion, the source electrode of field effect transistor receives the emitter stage of the 5th audion and the emitter stage of the 3rd audion, and the grid of field effect transistor received by the colelctor electrode of the 5th audion.
2. over-voltage over-current protection circuit according to claim 1, it is characterised in that: described low-pass filter unit includes filter unit outfan, filter inductance, the first filter resistance, the second filter resistance, filter capacitor；
The positive pole of described accumulator filtered inductance successively, the first filter resistance receive filter unit outfan, and described filter unit outfan receives ground through the second filter resistance, filter capacitor successively.
3. over-voltage over-current protection circuit according to claim 1, it is characterised in that: also including trigger element, described trigger element includes the 6th audion, the first trigger resistance, the second trigger resistance, the 3rd trigger resistance；The base stage of described 6th audion receives the colelctor electrode of the 5th audion through the first trigger resistance, and receive ground through the second trigger resistance, the emitter stage of the 6th audion receives ground, and the control signal outfan of controller received successively by the colelctor electrode of the 6th audion through the 3rd trigger resistance, the second self-locking resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521135295.XU CN205355798U (en) | 2015-12-31 | 2015-12-31 | Over -voltage and over -current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521135295.XU CN205355798U (en) | 2015-12-31 | 2015-12-31 | Over -voltage and over -current protection circuit |
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| Publication Number | Publication Date |
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| CN205355798U true CN205355798U (en) | 2016-06-29 |
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| CN201521135295.XU Active CN205355798U (en) | 2015-12-31 | 2015-12-31 | Over -voltage and over -current protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350268A (en) * | 2020-09-25 | 2021-02-09 | 北京智科车联科技有限公司 | Vehicle power supply control device and vehicle |
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- 2015-12-31 CN CN201521135295.XU patent/CN205355798U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350268A (en) * | 2020-09-25 | 2021-02-09 | 北京智科车联科技有限公司 | Vehicle power supply control device and vehicle |
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