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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 PDF

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Publication number
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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switching element
switch element
voltage dividing
dividing resistor
ground
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CN2011201034952U
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侯宏民
巨祥生
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SHENZHEN SED-IPD INTERNATIONAL ELECTRONIC DEVICE Co Ltd
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SHENZHEN SED-IPD INTERNATIONAL ELECTRONIC DEVICE Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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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

A kind of led drive circuit and short-circuit protection circuit thereof
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:
First switch element 301, second switch element 302, 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 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)

1.一种LED驱动电路的短路保护电路，分别接直流/直流恒流单元和LED负极，其特征在于，所述短路保护电路包括：1. A short-circuit protection circuit of an LED drive circuit, which is respectively connected to a DC/DC constant current unit and an LED negative pole, is characterized in that the short-circuit protection circuit comprises: 第一开关元件、第二开关元件、分压电阻R1、分压电阻R2、分压电阻R3、分压电阻R4、分压电阻R5、稳压二极管ZD1和电感C1；The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5, the voltage stabilizing diode ZD1 and the inductor C1; 所述第二开关元件的控制端通过分压电阻R1接电源端和所述直流/直流恒流单元的电源输出端，所述第二开关元件的第二端接地，所述分压电阻R2连接在所述第二开关元件的控制端与地之间，所述稳压二极管ZD1连接在所述第二开关元件的控制端与地之间，所述第二开关元件的第一端接LED负极，所述分压电阻R3和分压电阻R4串接在所述第二开关元件的第一端与地之间，所述第一开关元件的控制端接分压电阻R3和分压电阻R4的公共连接端，所述电感C1连接在第一开关元件的控制端与地之间，所述第一开关元件的第二端接地，所述第一开关元件的第一端通过分压电阻R5接所述直流/直流恒流单元的PWM控制端。The control end of the second switching element is connected to the power supply end and the power output end of the DC/DC constant current unit through the voltage dividing resistor R1, the second end of the second switching element is grounded, and the voltage dividing resistor R2 is connected to Between the control terminal of the second switching element and the ground, the Zener diode ZD1 is connected between the control terminal of the second switching element and the ground, and the first terminal of the second switching element is connected to the cathode of the LED , the voltage dividing resistor R3 and the voltage dividing resistor R4 are connected in series between the first end of the second switching element and the ground, and the control terminal of the first switching element is connected to the voltage dividing resistor R3 and the voltage dividing resistor R4 The common connection terminal, the inductor C1 is connected between the control terminal of the first switch element and the ground, the second end of the first switch element is grounded, and the first end of the first switch element is connected to the ground through the voltage dividing resistor R5 The PWM control terminal of the DC/DC constant current unit. 2.如权利要求1所述的短路保护电路，其特征在于，所述第一开关元件为三极管Q1，所述三极管Q1的基极为第一开关元件的控制端，所述三极管Q1的集电极为第一开关元件的第一端，所述三极管Q1的发射极为第一开关元件的第二端。2. The short-circuit protection circuit according to claim 1, wherein the first switching element is a triode Q1, the base of the triode Q1 is the control terminal of the first switching element, and the collector of the triode Q1 is The first end of the first switch element, the emitter of the transistor Q1 is the second end of the first switch element. 3.如权利要求1所述的短路保护电路，其特征在于，所述第二开关元件为MOS管Q2，所述MOS管Q2的栅极为第二开关元件的控制端，所述MOS管Q2的漏极为第二开关元件的第一端，所述MOS管Q2的源极为第二开关元件的第二端。3. The short-circuit protection circuit according to claim 1, wherein the second switching element is a MOS transistor Q2, the gate of the MOS transistor Q2 is the control terminal of the second switching element, and the gate of the MOS transistor Q2 is The drain is the first end of the second switch element, and the source of the MOS transistor Q2 is the second end of the second switch element. 4.一种LED驱动电路，包括直流/直流恒流单元、驱动输出单元和LED，其特征在于，所述LED驱动电路还包括短路保护电路，所述短路保护电路包括：4. A LED drive circuit, comprising a DC/DC constant current unit, a drive output unit and an LED, characterized in that, the LED drive circuit also includes a short circuit protection circuit, and the short circuit protection circuit includes: 第一开关元件、第二开关元件、分压电阻R1、分压电阻R2、分压电阻R3、分压电阻R4、分压电阻R5、稳压二极管ZD1和电感C1；The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5, the voltage stabilizing diode ZD1 and the inductor C1; 所述第二开关元件的控制端通过分压电阻R1接电源端和所述直流/直流恒流单元的电源输出端，所述第二开关元件的第二端接地，所述分压电阻R2连接在所述第二开关元件的控制端与地之间，所述稳压二极管ZD1连接在所述第二开关元件的控制端与地之间，所述第二开关元件的第一端接LED负极，所述分压电阻R3和分压电阻R4串接在所述第二开关元件的第一端与地之间，所述第一开关元件的控制端接分压电阻R3和分压电阻R4的公共连接端，所述电感C1连接在第一开关元件的控制端与地之间，所述第一开关元件的第二端接地，所述第一开关元件的第一端通过分压电阻R5接所述直流/直流恒流单元的PWM控制端。The control end of the second switching element is connected to the power supply end and the power output end of the DC/DC constant current unit through the voltage dividing resistor R1, the second end of the second switching element is grounded, and the voltage dividing resistor R2 is connected to Between the control terminal of the second switching element and the ground, the Zener diode ZD1 is connected between the control terminal of the second switching element and the ground, and the first terminal of the second switching element is connected to the cathode of the LED , the voltage dividing resistor R3 and the voltage dividing resistor R4 are connected in series between the first end of the second switching element and the ground, and the control terminal of the first switching element is connected to the voltage dividing resistor R3 and the voltage dividing resistor R4 The common connection terminal, the inductor C1 is connected between the control terminal of the first switch element and the ground, the second end of the first switch element is grounded, and the first end of the first switch element is connected to the ground through the voltage dividing resistor R5 The PWM control terminal of the DC/DC constant current unit. 5.如权利要求4所述的LED驱动电路，其特征在于，所述第一开关元件为三极管Q1，所述三极管Q1的基极为第一开关元件的控制端，所述三极管Q1的集电极为第一开关元件的第一端，所述三极管Q1的发射极为第一开关元件的第二端。5. The LED drive circuit according to claim 4, wherein the first switching element is a triode Q1, the base of the triode Q1 is the control terminal of the first switching element, and the collector of the triode Q1 is The first end of the first switch element, the emitter of the transistor Q1 is the second end of the first switch element. 6.如权利要求4所述的LED驱动电路，其特征在于，所述第二开关元件为MOS管Q2，所述MOS管Q2的栅极为第二开关元件的控制端，所述MOS管Q2的漏极为第二开关元件的第一端，所述MOS管Q2的源极为第二开关元件的第二端。6. The LED drive circuit according to claim 4, wherein the second switching element is a MOS transistor Q2, the gate of the MOS transistor Q2 is the control terminal of the second switching element, and the gate of the MOS transistor Q2 is The drain is the first end of the second switch element, and the source of the MOS transistor Q2 is the second end of the second switch element.
CN2011201034952U 2011-04-11 2011-04-11 Light emitting diode (LED) driving circuit and short circuit protection circuit thereof Expired - Fee Related CN202004436U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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

Cited By (7)

* Cited by examiner, † Cited by third party
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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