CN202004436U - Light emitting diode (LED) driving circuit and short circuit protection circuit thereof - Google Patents
Light emitting diode (LED) driving circuit and short circuit protection circuit thereof Download PDFInfo
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- CN202004436U CN202004436U CN2011201034952U CN201120103495U CN202004436U CN 202004436 U CN202004436 U CN 202004436U CN 2011201034952 U CN2011201034952 U CN 2011201034952U CN 201120103495 U CN201120103495 U CN 201120103495U CN 202004436 U CN202004436 U CN 202004436U
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- switch element
- divider resistance
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- constant current
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Abstract
The utility model is applied in the field of illumination equipment, and particularly relates to a light emitting diode (LED) driving circuit and a short circuit protection circuit thereof. The short circuit protection circuit comprises a first switching element, a second switching element, voltage dividing resistors R1, R2, R3, R4 and R5, a voltage stabilizing diode ZD1 and an inductor C1. In the embodiment of the utility model, when an output load is short-circuited, the control end of the first switching element instantly rises a level to switch the first switching element on, and the pulse width modulation (PWM) control end of a DC/DC constant current unit is grounded by the first switching element to switching the output of the DC/DC constant current unit off, thereby realizing a load short circuit protection function.
Description
Technical field
The utility model belongs to the lighting apparatus field, relates in particular to a kind of led drive circuit and short-circuit protection circuit thereof.
Background technology
LED is as new type light source, it has energy-saving and environmental protection, characteristics of high efficiency, technology is ripe and be applied to every field, LED is widely used as lighting source, various led drive circuits have also appearred thereupon, led drive circuit generally includes the DC-DC constant current unit that links to each other successively and drives output unit, and DC-DC constant current unit connects DC power supply, drives output unit and connects the LED positive pole.
In the process of work, the load that led drive circuit drives may produce anomaly, such as short circuit phenomenon, if this thing happens, will cause the inner many components and parts in DC-DC constant current unit to damage, severe patient also can cause security incidents such as fire, blast.
The utility model content
The purpose of this utility model is to provide a kind of short-circuit protection circuit of led drive circuit, is intended to solve present led drive circuit and the problem that can be damaged occurring under the situation of load short circuits.
The utility model is achieved in that a kind of short-circuit protection circuit of led drive circuit, connects DC-DC constant current unit and LED negative pole respectively, and described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
In the said structure, described first switch element is triode Q1, the base stage of described triode Q1 is the control end of first switch element, and the current collection of described triode Q1 is first end of first switch element very, and the emission of described triode Q1 is second end of first switch element very.
In the said structure, described second switch element is metal-oxide-semiconductor Q2, and the grid of described metal-oxide-semiconductor Q2 is the control end of second switch element, and the drain electrode of described metal-oxide-semiconductor Q2 is first end of second switch element, and the source electrode of described metal-oxide-semiconductor Q2 is second end of second switch element.
Another purpose of the utility model is to provide a kind of led drive circuit, comprises DC-DC constant current unit, drives output unit and LED, and described led drive circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
In the said structure, described first switch element is triode Q1, the base stage of described triode Q1 is the control end of first switch element, and the current collection of described triode Q1 is first end of first switch element very, and the emission of described triode Q1 is second end of first switch element very.
In the said structure, described second switch element is metal-oxide-semiconductor Q2, and the grid of described metal-oxide-semiconductor Q2 is the control end of second switch element, and the drain electrode of described metal-oxide-semiconductor Q2 is first end of second switch element, and the source electrode of described metal-oxide-semiconductor Q2 is second end of second switch element.
In the utility model; when the output loading short circuit; control end moment of first switch element adds high level; cause the first switch element conducting; the PWM control end of DC-DC constant current unit is by the first switch element ground connection; cause the output of DC-DC constant current unit to be turn-offed, thereby realize the function of load short circuits protection.
Description of drawings
Fig. 1 is the circuit diagram of the led drive circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
A kind of short-circuit protection circuit of led drive circuit connects DC-DC constant current unit and LED negative pole respectively, and described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
A kind of led drive circuit comprises DC-DC constant current unit, drives output unit and LED, and described led drive circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
Fig. 1 shows the circuit structure of the led drive circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
Led drive circuit generally includes DC-DC constant current unit 100, driving output unit 200 and the LED that links to each other successively; DC-DC constant current unit 100 connects DC power supply; drive output unit 200 and connect the LED positive pole; led drive circuit also comprises short-circuit protection circuit 300, and short-circuit protection circuit 300 comprises:
The control end of second switch element 302 meets the power output end OUT of power end VCC and DC-DC constant current unit 100 by divider resistance R1, the second end ground connection of second switch element 302, divider resistance R2 is connected between the control end and ground of second switch element 302, voltage stabilizing didoe ZD1 is connected between the control end and ground of second switch element 302, the first termination LED negative pole of second switch unit 302, divider resistance R3 and divider resistance R4 are serially connected between first end and ground of second switch element 302, the control termination divider resistance R3 of first switch element 301 and the public connecting end of divider resistance R4, inductance C1 is connected between the control end and ground of the first switch unit 301, the second end ground connection of first switch element 301, first end of the first switch unit 301 meet the PWM control end PWM of DC-DC constant current unit 100 by divider resistance R5.
As the utility model one embodiment, first switch element 301 is triode Q1, the base stage of triode Q1 is the control end of first switch element 301, and the current collection of triode Q1 is first end of the first switch unit 301 very, and the emission of triode Q1 is second end of first switch element 301 very.
As the utility model one embodiment, second switch element 302 is metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q2 is the control end of second switch element 302, and the drain electrode of metal-oxide-semiconductor Q2 is first end of second switch element 302, and the source electrode of metal-oxide-semiconductor Q2 is second end of second switch unit 302.
The operation principle of short-circuit protection circuit 300 is:
When the output loading short circuit; control end moment of triode Q1 adds high level, causes triode Q1 conducting, and the PWM control end of DC-DC constant current unit is by triode Q1 ground connection; cause the output of DC-DC constant current unit to be turn-offed, thereby realize the function of load short circuits protection.
In the utility model embodiment; when the output loading short circuit; control end moment of first switch element adds high level; cause the first switch element conducting; the PWM control end of DC-DC constant current unit is by the first switch element ground connection; cause the output of DC-DC constant current unit to be turn-offed, thereby realize the function of load short circuits protection.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. the short-circuit protection circuit of a led drive circuit connects DC-DC constant current unit and LED negative pole respectively, it is characterized in that described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
2. short-circuit protection circuit as claimed in claim 1; it is characterized in that; described first switch element is triode Q1; the base stage of described triode Q1 is the control end of first switch element; the current collection of described triode Q1 is first end of first switch element very, and the emission of described triode Q1 is second end of first switch element very.
3. short-circuit protection circuit as claimed in claim 1; it is characterized in that; described second switch element is metal-oxide-semiconductor Q2; the grid of described metal-oxide-semiconductor Q2 is the control end of second switch element; the drain electrode of described metal-oxide-semiconductor Q2 is first end of second switch element, and the source electrode of described metal-oxide-semiconductor Q2 is second end of second switch element.
4. a led drive circuit comprises DC-DC constant current unit, drives output unit and LED, it is characterized in that described led drive circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit comprises:
First switch element, second switch element, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, voltage stabilizing didoe ZD1 and inductance C1;
The control end of described second switch element connects the power output end of power end and described DC-DC constant current unit by divider resistance R1, the second end ground connection of described second switch element, described divider resistance R2 is connected between the control end and ground of described second switch element, described voltage stabilizing didoe ZD1 is connected between the control end and ground of described second switch element, the first termination LED negative pole of described second switch element, described divider resistance R3 and divider resistance R4 are serially connected between first end and ground of described second switch element, the control termination divider resistance R3 of described first switch element and the public connecting end of divider resistance R4, described inductance C1 is connected between the control end and ground of first switch element, the second end ground connection of described first switch element, first end of described first switch element connect the PWM control end of described DC-DC constant current unit by divider resistance R5.
5. led drive circuit as claimed in claim 4, it is characterized in that, described first switch element is triode Q1, the base stage of described triode Q1 is the control end of first switch element, the current collection of described triode Q1 is first end of first switch element very, and the emission of described triode Q1 is second end of first switch element very.
6. led drive circuit as claimed in claim 4, it is characterized in that, described second switch element is metal-oxide-semiconductor Q2, the grid of described metal-oxide-semiconductor Q2 is the control end of second switch element, the drain electrode of described metal-oxide-semiconductor Q2 is first end of second switch element, and the source electrode of described metal-oxide-semiconductor Q2 is second end of second switch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201034952U CN202004436U (en) | 2011-04-11 | 2011-04-11 | Light emitting diode (LED) driving circuit and short circuit protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201034952U CN202004436U (en) | 2011-04-11 | 2011-04-11 | Light emitting diode (LED) driving circuit and short circuit protection circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202004436U true CN202004436U (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201034952U Expired - Fee Related CN202004436U (en) | 2011-04-11 | 2011-04-11 | Light emitting diode (LED) driving circuit and short circuit protection circuit thereof |
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| CN (1) | CN202004436U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231511A (en) * | 2011-04-11 | 2011-11-02 | 深圳桑达国际电子器件有限公司 | LED drive circuit and short-circuit protection circuit thereof |
| CN102510606A (en) * | 2011-10-18 | 2012-06-20 | 开源集成电路(苏州)有限公司 | Method and device for short-circuit protection of current detection resistor of LED (Light Emitting Diode) driving circuit |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| CN106058797A (en) * | 2016-07-05 | 2016-10-26 | 徐云松 | Anti-short-circuit electronic switch |
-
2011
- 2011-04-11 CN CN2011201034952U patent/CN202004436U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231511A (en) * | 2011-04-11 | 2011-11-02 | 深圳桑达国际电子器件有限公司 | LED drive circuit and short-circuit protection circuit thereof |
| CN102510606A (en) * | 2011-10-18 | 2012-06-20 | 开源集成电路(苏州)有限公司 | Method and device for short-circuit protection of current detection resistor of LED (Light Emitting Diode) driving circuit |
| CN102510606B (en) * | 2011-10-18 | 2014-05-14 | 开源集成电路(苏州)有限公司 | Method and device for short-circuit protection of current detection resistor of LED (Light Emitting Diode) driving circuit |
| CN103442501A (en) * | 2013-09-12 | 2013-12-11 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| CN103442501B (en) * | 2013-09-12 | 2014-11-19 | 江华 | Forced constant flow source dimming LED (Light Emitting Diode) lamp |
| CN106058797A (en) * | 2016-07-05 | 2016-10-26 | 徐云松 | Anti-short-circuit electronic switch |
| CN106058797B (en) * | 2016-07-05 | 2020-02-28 | 徐云松 | Short-circuit-resistant electronic switch |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20150411 |
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| EXPY | Termination of patent right or utility model |