CN204179633U - A kind of short-circuit protection circuit of LED power - Google Patents
A kind of short-circuit protection circuit of LED power Download PDFInfo
- Publication number
- CN204179633U CN204179633U CN201420620533.5U CN201420620533U CN204179633U CN 204179633 U CN204179633 U CN 204179633U CN 201420620533 U CN201420620533 U CN 201420620533U CN 204179633 U CN204179633 U CN 204179633U
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- China
- Prior art keywords
- resistance
- circuit
- triode
- voltage stabilizing
- stabilizing didoe
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- 230000000087 stabilizing Effects 0.000 claims abstract description 27
- 230000003287 optical Effects 0.000 claims abstract description 22
- 230000002633 protecting Effects 0.000 abstract description 4
- 230000001808 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 abstract description 3
- 230000001681 protective Effects 0.000 abstract description 3
- 206010020039 Hiccups Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Abstract
The utility model discloses a kind of short-circuit protection circuit of LED power; it is characterized in that: comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode, the first voltage stabilizing didoe, the second voltage stabilizing didoe, electric capacity, optical coupler and pwm chip; first resistance, the second resistance, the first triode, the first voltage stabilizing didoe and electric capacity form voltage stabilizing circuit; optical coupler and the 3rd resistance form optical coupling isolation circuit, and the 4th resistance, the second triode and the second voltage stabilizing didoe form protecting control circuit.The short-circuit protection circuit of a kind of LED power described in the utility model; by the voltage of pwm chip power end is pulled low to electronegative potential; pwm chip is forced to quit work; reach the object of protection LED power fast; avoid the impact of pwm chip self feedback loop speed; improve the reliability of protective circuit, reduce short-circuit dissipation.
Description
Technical field
The utility model relates to a kind of short-circuit protection circuit of LED power.
Background technology
LED power when output short-circuit or overcurrent, often exist burn out sampling resistor, damage control chip, damage switching tube, power supply has the hiccups and the problem such as short-circuit dissipation is large, need be provided with short-circuit protection circuit.At present, the short-circuit protection short circuit of LED power generally adopts the closed feedback loop of the pwm chip self in LED power, is subject to the restriction of feedback loop speed, there will be and has the hiccups and phenomenon that power consumption is excessive.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the utility model provides the short-circuit protection circuit that a kind of reliability of LED power is high.
To achieve these goals, the technical solution adopted in the utility model is:
The short-circuit protection circuit of a kind of LED power described in the utility model, is characterized in that: comprise the first resistance, second resistance, 3rd resistance, 4th resistance, first triode, second triode, first voltage stabilizing didoe, second voltage stabilizing didoe, electric capacity, optical coupler and pwm chip, the described first end of the first resistance is connected with the cathode output end of LED power, the second end of described first resistance simultaneously with the first end of the second resistance, the collector electrode of the first triode connects, the second end of described second resistance simultaneously with the base stage of the first triode, the negative pole of the first voltage stabilizing didoe connects, the emitter of described first triode simultaneously with the first end of the 3rd resistance, the first end of electric capacity connects, and the second end of described 3rd resistance is connected with the positive pole of optical coupler, with the second end of electric capacity while of the positive pole of described first voltage stabilizing didoe, the negative pole of optical coupler, the cathode output end of LED power connects, the collector electrode of described optical coupler simultaneously with the first end of the 4th resistance, the base stage of the second triode connects, the emitter of described second triode is connected with the negative pole of the second voltage stabilizing didoe, second end of described 4th resistance is as boost voltage input, the collector electrode of described second triode is connected with the positive pole of pwm chip power end, the emitter of described optical coupler simultaneously with the positive pole of the second voltage stabilizing didoe, the negative pole of pwm chip power end connects.
Compared with prior art, the beneficial effects of the utility model:
The short-circuit protection circuit of a kind of LED power described in the utility model; by the voltage of pwm chip power end is pulled low to electronegative potential; pwm chip is forced to quit work; reach the object of protection LED power fast; avoid the impact of pwm chip self feedback loop speed; improve the reliability of protective circuit, reduce short-circuit dissipation.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the short-circuit protection circuit of a kind of LED power described in the utility model.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the short-circuit protection circuit of a kind of LED power described in the utility model, is characterized in that: comprise the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, first triode Q1, second triode Q2, first voltage stabilizing didoe D1, second voltage stabilizing didoe D2, electric capacity C, optical coupler U and pwm chip Up, the first end of described first resistance R1 is connected with the cathode output end (Vl) of LED power, second end of described first resistance R1 simultaneously with the first end of the second resistance R2, the collector electrode of the first triode Q1 connects, second end of described second resistance R2 simultaneously with the base stage of the first triode Q1, the negative pole of the first voltage stabilizing didoe D1 connects, the emitter of described first triode Q1 simultaneously with the first end of the 3rd resistance R3, the first end of electric capacity C connects, and second end of described 3rd resistance R3 is connected with the positive pole of optical coupler U, with second end of electric capacity C while of the positive pole of described first voltage stabilizing didoe D1, the negative pole of optical coupler U, the cathode output end of LED power connects, the collector electrode of described optical coupler U simultaneously with the first end of the 4th resistance R4, the base stage of the second triode Q2 connects, the emitter of described second triode Q2 is connected with the negative pole of the second voltage stabilizing didoe D2, second end of described 4th resistance R4 is as boost voltage input Vr, the collector electrode of described second triode Q2 is connected with the positive pole of pwm chip Up power end, the emitter of described optical coupler U simultaneously with the positive pole of the second voltage stabilizing didoe D2, the negative pole of pwm chip Up power end connects.
The short-circuit protection circuit of a kind of LED power described in the utility model; first resistance R1, the second resistance R2, the first triode Q1, the first voltage stabilizing didoe D1 and electric capacity C form voltage stabilizing circuit; optical coupler U and the 3rd resistance R3 forms optical coupling isolation circuit, and the 4th resistance R4, the second triode Q2 and the second voltage stabilizing didoe D2 form protecting control circuit.When output short-circuit; the output voltage Vl of LED power declines fast; the output voltage of voltage stabilizing circuit declines; the optical coupler U of optical coupling isolation circuit turns off; second triode Q2 conducting of protecting control circuit; the power end of pwm chip Up, by the second triode Q2 repid discharge, forces pwm chip Up to quit work, thus protects LED power fast.This short-circuit protection circuit is by being pulled low to electronegative potential by the voltage of pwm chip Up power end; pwm chip Up is forced to quit work; reach the object of protection LED power fast; avoid the impact of self feedback loop speed of pwm chip Up; improve the reliability of protective circuit, reduce short-circuit dissipation.
Claims (1)
1. a short-circuit protection circuit for LED power, is characterized in that: comprise the first resistance, second resistance, 3rd resistance, 4th resistance, first triode, second triode, first voltage stabilizing didoe, second voltage stabilizing didoe, electric capacity, optical coupler and pwm chip, the described first end of the first resistance is connected with the cathode output end of LED power, the second end of described first resistance simultaneously with the first end of the second resistance, the collector electrode of the first triode connects, the second end of described second resistance simultaneously with the base stage of the first triode, the negative pole of the first voltage stabilizing didoe connects, the emitter of described first triode simultaneously with the first end of the 3rd resistance, the first end of electric capacity connects, and the second end of described 3rd resistance is connected with the positive pole of optical coupler, with the second end of electric capacity while of the positive pole of described first voltage stabilizing didoe, the negative pole of optical coupler, the cathode output end of LED power connects, the collector electrode of described optical coupler simultaneously with the first end of the 4th resistance, the base stage of the second triode connects, the emitter of described second triode is connected with the negative pole of the second voltage stabilizing didoe, second end of described 4th resistance is as boost voltage input, the collector electrode of described second triode is connected with the positive pole of pwm chip power end, the emitter of described optical coupler simultaneously with the positive pole of the second voltage stabilizing didoe, the negative pole of pwm chip power end connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420620533.5U CN204179633U (en) | 2014-10-25 | 2014-10-25 | A kind of short-circuit protection circuit of LED power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420620533.5U CN204179633U (en) | 2014-10-25 | 2014-10-25 | A kind of short-circuit protection circuit of LED power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204179633U true CN204179633U (en) | 2015-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420620533.5U Expired - Fee Related CN204179633U (en) | 2014-10-25 | 2014-10-25 | A kind of short-circuit protection circuit of LED power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204179633U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100307A (en) * | 2016-06-30 | 2016-11-09 | 阳光电源股份有限公司 | A kind of Switching Power Supply and short-circuit protection method thereof |
-
2014
- 2014-10-25 CN CN201420620533.5U patent/CN204179633U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100307A (en) * | 2016-06-30 | 2016-11-09 | 阳光电源股份有限公司 | A kind of Switching Power Supply and short-circuit protection method thereof |
| CN106100307B (en) * | 2016-06-30 | 2018-12-28 | 阳光电源股份有限公司 | A kind of Switching Power Supply and its short-circuit protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150921 Address after: 518100, Guangdong, Baoan District, Fuyong, Shenzhen street, with the rich industrial zone fourth (Hui Mingsheng Industrial Park, No. 4 workshop) three or four floors Patentee after: YUYUANFENG TECH (SHENZHEN) CO., LTD. Address before: 636350 Taiping Road, Wanyuan Town, Wanyuan City, Sichuan, Dazhou Patentee before: WANYUAN HAILV TECHNOLOGY CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150225 Termination date: 20181025 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |