CN204205548U - Circuit overcurrent protection - Google Patents
Circuit overcurrent protection Download PDFInfo
- Publication number
- CN204205548U CN204205548U CN201420766848.0U CN201420766848U CN204205548U CN 204205548 U CN204205548 U CN 204205548U CN 201420766848 U CN201420766848 U CN 201420766848U CN 204205548 U CN204205548 U CN 204205548U
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- detection module
- current detection
- voltage
- circuit
- termination
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Abstract
A kind of circuit overcurrent protection, is connected between low-voltage dc power supply and load, comprises: overcurrent vreaker part, the output of low-voltage dc power supply described in its input termination; Current detection module, the output of overcurrent vreaker part described in input termination, exports the input of load described in termination, at trigger end trigger output voltage when the pressure drop of described current detection module exceedes threshold value; Division module, the trigger end of current detection module described in a termination, other end ground connection; One-way SCR, anode connects the input of described current detection module, controls the trigger end that pole connects described current detection module, minus earth.When being broken down by load; the electric current of major loop increases; current detection module produces and sends trigger voltage when voltage drop exceedes threshold value and make one-way SCR conducting; the input of load is shorted to ground; now producing a big current makes overcurrent vreaker part fuse; cut off the power supply of major loop, effectively protect electrical appliance, reduce the possibility of fire.
Description
Technical field
The utility model relates to overcurrent protection field, is specifically related to a kind of circuit overcurrent protection.
Background technology
In DC-DC(DC converting) low voltage conversion circuit in, because supply power voltage is DC low-voltage, be generally below 60VDC, when DC-DC change-over circuit breaks down, front end fuse not easily disconnects, and element can be caused slowly to generate heat and burn circuit board and equipment, even cause fire.
Summary of the invention
The utility model provides a kind of circuit overcurrent protection, and during to solve that in prior art, DC low-voltage is powered, fuse is not easy to trigger, and easily causes the problem that circuit is destroyed.
The utility model provides a kind of circuit overcurrent protection, is connected between low-voltage dc power supply and load, comprises:
Overcurrent vreaker part, has overcurrent fuse function, the output of low-voltage dc power supply described in its input termination;
Current detection module, the output of overcurrent vreaker part described in input termination, exports the input of load described in termination, at trigger end trigger output voltage when the pressure drop of described current detection module exceedes threshold value;
Division module, the trigger end of current detection module described in a termination, other end ground connection;
One-way SCR, anode connects the input of described current detection module, controls the trigger end that pole connects described current detection module, minus earth.
Preferably, described current detection module comprises sampling resistor and PNP type triode, described sampling resistor first end as current detection module input termination described in the output of overcurrent vreaker part, and to be connected with the emitter of described triode; Described sampling resistor second end as the input for load described in the output termination of current detection module, and is connected with the base stage of described triode, and the collector electrode of described triode is as the trigger end of current detection module.
Preferably, described triode is the little paster triode of SOT23 encapsulation.
Preferably, described division module comprises divider resistance and electric capacity of voltage regulation, and the collector electrode of triode described in described divider resistance one termination, other end ground connection, described electric capacity of voltage regulation is in parallel with described divider resistance.
Preferably, described divider resistance is Chip-R.
Preferably, described electric capacity of voltage regulation is patch capacitor.
Preferably, described overcurrent vreaker part is fuse or fuse.
Preferably, described low-voltage dc power supply comprises the EMI current rectifying and wave filtering circuit, isolation single-stage pfc circuit and the current rectifying and wave filtering circuit that connect successively, and described EMI current rectifying and wave filtering circuit incoming transport power supply, described current rectifying and wave filtering circuit exports low-voltage DC.
Preferably, described load is DC-DC conversion circuit.
When above-mentioned circuit overcurrent protection is broken down by load, the electric current of major loop increases, current detection module produces and sends trigger voltage when voltage drop exceedes threshold value and make one-way SCR conducting, the input of load is shorted to ground, now producing a big current makes overcurrent vreaker part fuse, cut off the power supply of major loop, effectively protect electrical appliance, reduce the possibility of fire; This circuit devcie is less, and cost is lower, and practicality is high.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of circuit overcurrent protection in the utility model preferred embodiment.
Embodiment
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, in the present embodiment, circuit overcurrent protection 100 is connected between low-voltage dc power supply 200 and load 300.Low-voltage dc power supply 200 comprises the EMI(Electromagnetic Interference connected successively; electromagnetic interference) current rectifying and wave filtering circuit 201, isolation single-stage PFC(Power Factor Correction; power factor correction) circuit 202 and current rectifying and wave filtering circuit 203; EMI current rectifying and wave filtering circuit 201 incoming transport power supply AC, current rectifying and wave filtering circuit 203 exports low-voltage DC to circuit overcurrent protection 100.In other embodiments, low-voltage DC can be provided by other existing modes, is not restricted this.
In addition, in the present embodiment, load 300 is DC-DC conversion circuit, and it receives the direct voltage DC after the low-voltage DC output transform of low-voltage dc power supply 200 output.In other embodiments, load 300 can be other power circuits or equipment, is not restricted this.
Circuit overcurrent protection 100 in the utility model preferred embodiment comprises overcurrent vreaker part 101, current detection module 102, division module 103 and one-way SCR D1.
Overcurrent vreaker part 101 has overcurrent fuse function, is fuse or fuse.The output of the input termination low-voltage dc power supply 200 of overcurrent vreaker part 101; The input of current detection module 102 takes over the output of stream breaking device 101, the input of the output terminating load 300 of current detection module 102, at trigger end trigger output voltage when the pressure drop of current detection module 102 exceedes threshold value; The trigger end of one termination current detection module 102 of division module 103, the other end ground connection of division module 103; The anode of one-way SCR D1 connects the input of current detection module 102, and the control pole of one-way SCR D1 connects the trigger end of current detection module 102, the minus earth of one-way SCR D1.
Current detection module 102 comprises sampling resistor R1 and PNP type triode Q1, and sampling resistor R1 first end takes over as the input of current detection module 102 output flowing breaking device 101, and is connected with the emitter of triode Q1; Sampling resistor R1 second end as the input of the output terminating load 300 for current detection module 102, and is connected with the base stage of triode Q1, and the collector electrode of triode Q1 is as the trigger end of current detection module 102.Preferably, triode Q1 is the little paster triode of SOT23 encapsulation.
Preferably, division module 103 comprises divider resistance R2 and electric capacity of voltage regulation C1, and the collector electrode of divider resistance R2 mono-termination triode Q1, other end ground connection, electric capacity of voltage regulation C1 is in parallel with divider resistance R2.Preferably, divider resistance R2 is Chip-R.Electric capacity of voltage regulation C1 is patch capacitor.
When above-mentioned circuit overcurrent protection 100 is broken down by load 300, the electric current of major loop increases, current detection module 102 produces and sends trigger voltage when voltage drop exceedes threshold value and make one-way SCR D1 conducting, the input of load 300 is shorted to ground, now producing a big current makes overcurrent vreaker part 101 fuse, cut off the power supply of major loop, effectively protect electrical appliance, reduce the possibility of fire; This circuit devcie is less, and cost is lower, and practicality is high.
The above embodiment only have expressed several execution mode of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a circuit overcurrent protection, is connected between low-voltage dc power supply and load, it is characterized in that, comprising:
Overcurrent vreaker part, has overcurrent fuse function, the output of low-voltage dc power supply described in its input termination;
Current detection module, the output of overcurrent vreaker part described in input termination, exports the input of load described in termination, at trigger end trigger output voltage when the pressure drop of described current detection module exceedes threshold value;
Division module, the trigger end of current detection module described in a termination, other end ground connection;
One-way SCR, anode connects the input of described current detection module, controls the trigger end that pole connects described current detection module, minus earth.
2. circuit overcurrent protection according to claim 1, it is characterized in that, described current detection module comprises sampling resistor and PNP type triode, described sampling resistor first end as current detection module input termination described in the output of overcurrent vreaker part, and to be connected with the emitter of described triode; Described sampling resistor second end as the input for load described in the output termination of current detection module, and is connected with the base stage of described triode, and the collector electrode of described triode is as the trigger end of current detection module.
3. circuit overcurrent protection according to claim 2, is characterized in that, described triode is the little paster triode of SOT23 encapsulation.
4. the circuit overcurrent protection according to Claims 2 or 3; it is characterized in that, described division module comprises divider resistance and electric capacity of voltage regulation, the collector electrode of triode described in described divider resistance one termination; other end ground connection, described electric capacity of voltage regulation is in parallel with described divider resistance.
5. circuit overcurrent protection according to claim 4, is characterized in that, described divider resistance is Chip-R.
6. circuit overcurrent protection according to claim 4, is characterized in that, described electric capacity of voltage regulation is patch capacitor.
7. circuit overcurrent protection according to claim 1, is characterized in that, described overcurrent vreaker part is fuse or fuse.
8. circuit overcurrent protection according to claim 1; it is characterized in that; described low-voltage dc power supply comprises the EMI current rectifying and wave filtering circuit, isolation single-stage pfc circuit and the current rectifying and wave filtering circuit that connect successively; described EMI current rectifying and wave filtering circuit incoming transport power supply, described current rectifying and wave filtering circuit exports low-voltage DC.
9. the circuit overcurrent protection according to claim 1 or 8, is characterized in that, described load is DC-DC conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420766848.0U CN204205548U (en) | 2014-12-09 | 2014-12-09 | Circuit overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420766848.0U CN204205548U (en) | 2014-12-09 | 2014-12-09 | Circuit overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204205548U true CN204205548U (en) | 2015-03-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420766848.0U Expired - Fee Related CN204205548U (en) | 2014-12-09 | 2014-12-09 | Circuit overcurrent protection |
Country Status (1)
| Country | Link |
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| CN (1) | CN204205548U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995749A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The driving short-circuit protection circuit of classroom blackboard LED light strip |
| CN108055732A (en) * | 2017-12-28 | 2018-05-18 | 广州爱易学智能信息科技有限公司 | The current constant control protection circuit of classroom blackboard LED light strip |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
-
2014
- 2014-12-09 CN CN201420766848.0U patent/CN204205548U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995749A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The driving short-circuit protection circuit of classroom blackboard LED light strip |
| CN108055732A (en) * | 2017-12-28 | 2018-05-18 | 广州爱易学智能信息科技有限公司 | The current constant control protection circuit of classroom blackboard LED light strip |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150311 Termination date: 20161209 |