CN101778511A - Output over-voltage protection circuit and LED power supply driver - Google Patents
Output over-voltage protection circuit and LED power supply driver Download PDFInfo
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- CN101778511A CN101778511A CN201010100967A CN201010100967A CN101778511A CN 101778511 A CN101778511 A CN 101778511A CN 201010100967 A CN201010100967 A CN 201010100967A CN 201010100967 A CN201010100967 A CN 201010100967A CN 101778511 A CN101778511 A CN 101778511A
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Abstract
The invention is applicable for the lighting field, and provides an output over-voltage protection circuit and an LED power supply driver. In the invention, the output over-voltage protection circuit comprises a detection unit and an action unit, wherein the action unit outputs action signals according to signals in detection results output by the detection unit, so as to control a PWM wave pulse generation unit to switch off the output of the LED power supply driver or restart the LED power supply driver. The output over-voltage protection circuit has simple structure. Moreover, when the output over-voltage fault of the LED power supply driver is eliminated, the output over-voltage protection circuit can restart the LED power supply driver.
Description
Technical field
The invention belongs to lighting field, relate in particular to a kind of output over-voltage protection circuit and LED power supply driver.
Background technology
Led light source possesses light efficiency height, energy-efficient, characteristic such as the life-span is long, low pressure is controlled, is widely used in the indoor and outdoor lighting in each field.In application, the defencive function of LED power supply driver is particularly important, such as the output over-voltage protection function, because when LED power supply driver output overvoltage, and the one, bring dangerous high pressure, the 2nd, can damage driver and light source.
Output over-voltage protection circuit at the LED power supply driver has also appearred now; but; this output over-voltage protection circuit is to carry out the output over-voltage protection according to the Secondary winding of transformer voltage condition of LED power supply driver; the complex structure of this output over-voltage protection circuit; and after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can not restart the LED power supply driver.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of output over-voltage protection circuit, is intended to solve the problem that there is complex structure in existing output over-voltage protection circuit and can not restarts the LED power supply driver.
The embodiment of the invention is achieved in that a kind of output over-voltage protection circuit, and described output over-voltage protection circuit comprises:
With the detecting unit that the elementary winding of the transformer of LED power supply driver is connected, be used to detect the elementary winding supply power voltage that the described LED power supply driver output voltage of reflection changes, output testing result signal; And
Input is connected with the output of described detecting unit, the motor unit that output is connected with the feedback signal terminal of the PWM wave impulse generating unit of described LED power supply driver, be used to receive described testing result signal, if described testing result signal reflection LED power supply driver output overvoltage, then the described PWM wave impulse of output action signal controlling generating unit is closed the output of LED power supply driver, if described testing result signal reflection LED power supply driver is exported not overvoltage, then the described PWM wave impulse of output action signal controlling generating unit restarts the LED power supply driver.
Another purpose of the embodiment of the invention is to provide a kind of LED power supply driver as above-mentioned output over-voltage protection circuit.
In embodiments of the present invention; output over-voltage protection circuit comprises detecting unit and motor unit; motor unit is according to the testing result signal of detecting unit output; output action signal controlling PWM wave impulse generating unit is closed the output of LED power supply driver or is restarted the LED power supply driver; this output over-voltage protection circuit is simple in structure; and after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can restart the LED power supply driver.
Description of drawings
Fig. 1 is the structure chart of the output over-voltage protection circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit structure chart of the output over-voltage protection circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the output over-voltage protection circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Output over-voltage protection circuit comprises detecting unit 100 and motor unit 200, wherein, detecting unit 100 is connected with the elementary winding of the transformer of LED power supply driver, is used to detect the elementary winding supply power voltage that reflection LED power supply driver output voltage changes, output testing result signal; The input of motor unit 200 is connected with the output of detecting unit 100, output is connected with the feedback signal terminal of the PWM wave impulse generating unit 300 of LED power supply driver, be used to receive the testing result signal, if testing result signal reflection LED power supply driver output overvoltage, then output action signal controlling PWM wave impulse generating unit 300 is closed the output of LED power supply driver, if testing result signal reflection LED power supply driver is exported not overvoltage, then output action signal controlling PWM wave impulse generating unit 300 restarts the LED power supply driver.
Fig. 2 shows the exemplary circuit structure of the output over-voltage protection circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, detecting unit 100 comprises the elementary winding of transformer of the input termination LED power supply driver of first switch element, 101, the first switch elements 101, the input of the output termination motor unit 200 of first switch element 101.
As one embodiment of the invention, motor unit 200 comprises second switch element 201 and the 3rd switch element 202, the output of control termination first switch element 101 of second switch element 201, the control end of second switch element 201 and input connect the elementary winding of the transformer of LED power supply driver simultaneously, the control end of output termination the 3rd switch element 202 of second switch element 201, the input of the 3rd switch element 202 connect the elementary winding of transformer of LED power supply driver and the feedback signal terminal of PWM wave impulse generating unit 300 simultaneously.
As one embodiment of the invention, first switch element 101 is voltage-stabiliser tube Z1, and the negative electrode of voltage-stabiliser tube Z1 connects the elementary winding of the transformer of LED power supply driver, and the anode of voltage-stabiliser tube Z1 connects the control end of second switch element 201.
As one embodiment of the invention, second switch element 201 and the 3rd switch element 202 are respectively the first triode Q1 and the second triode Q2, the base stage of the first triode Q1 connects the anode of voltage-stabiliser tube Z1, the base stage of the first triode Q1 and collector electrode connect the elementary winding of the transformer of LED power supply driver simultaneously, the emitter of the first triode Q1 connects the base stage of the second triode Q2, the collector electrode of the second triode Q2 connects the elementary winding of transformer of LED power supply driver and the feedback signal terminal of PWM wave impulse generating unit 300, the grounded emitter of the second triode Q2 simultaneously.
Detecting unit 100 also comprises resistance R 3 and diode D1, wherein, the anode of the first termination voltage-stabiliser tube Z1 of resistance R 3, the second end ground connection of resistance R 3, the anode of diode D1 connects the anode of voltage-stabiliser tube Z1, and the negative electrode of diode D1 connects the base stage of the first triode Q1.
The embodiment of the invention also provides a kind of LED power supply driver that comprises above-mentioned output over-voltage protection circuit.
As one embodiment of the invention, PWM wave impulse generating unit 300 adopts mosfet driver.
Its operation principle is:
When LED power supply driver output overvoltage, the voltage at the voltage-stabiliser tube Z1 two ends that are connected with the elementary winding of the transformer of LED power supply driver surpasses the magnitude of voltage that voltage-stabiliser tube Z1 sets, after voltage-stabiliser tube Z1 is reversed puncture, the first triode Q1 is elevated and conducting owing to base potential, the second triode Q2 is because base potential is elevated also conducting, the cathode voltage of diode D2 is dragged down, PWM wave impulse generating unit 300 is closed the output of LED power supply driver, after the output over-voltage fault is eliminated, the base voltage of the first triode Q1 becomes low level, the first triode Q1 turn-offs, the base voltage of the second triode Q2 also becomes low level, the second triode Q2 also turn-offs, and the cathode voltage of diode D2 is drawn high, and PWM wave impulse generating unit 300 restarts the LED power supply driver.
In embodiments of the present invention; output over-voltage protection circuit comprises detecting unit and motor unit; motor unit is according to the testing result signal of detecting unit output; output action signal controlling PWM wave impulse generating unit is closed the output of LED power supply driver or is restarted the LED power supply driver; this output over-voltage protection circuit is simple in structure; and after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can restart the LED power supply driver.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an output over-voltage protection circuit is characterized in that, described output over-voltage protection circuit comprises:
With the detecting unit that the elementary winding of the transformer of LED power supply driver is connected, be used to detect the elementary winding supply power voltage that the described LED power supply driver output voltage of reflection changes, output testing result signal; And
Input is connected with the output of described detecting unit, the motor unit that output is connected with the feedback signal terminal of the PWM wave impulse generating unit of described LED power supply driver, be used to receive described testing result signal, if described testing result signal reflection LED power supply driver output overvoltage, then the described PWM wave impulse of output action signal controlling generating unit is closed the output of LED power supply driver, if described testing result signal reflection LED power supply driver is exported not overvoltage, then the described PWM wave impulse of output action signal controlling generating unit restarts the LED power supply driver.
2. output over-voltage protection circuit as claimed in claim 1; it is characterized in that; described detecting unit comprises first switch element; the elementary winding of the transformer of the described LED power supply driver of input termination of described first switch element, the input of the described motor unit of output termination of described first switch element.
3. output over-voltage protection circuit as claimed in claim 2; it is characterized in that; described motor unit comprises second switch element and the 3rd switch element; the output of described first switch element of control termination of described second switch element; the control end of described second switch element and input connect the elementary winding of the transformer of described LED power supply driver simultaneously; the control end of described the 3rd switch element of output termination of described second switch element, the input of described the 3rd switch element connect the elementary winding of transformer of described LED power supply driver and the feedback signal terminal of PWM wave impulse generating unit simultaneously.
4. output over-voltage protection circuit as claimed in claim 3; it is characterized in that; described first switch element is a voltage-stabiliser tube, and the negative electrode of described voltage-stabiliser tube connects the elementary winding of the transformer of described LED power supply driver, and the anode of described voltage-stabiliser tube connects the control end of described second switch element.
5. output over-voltage protection circuit as claimed in claim 4; it is characterized in that; described second switch element and the 3rd switch element are respectively first triode and second triode; the base stage of described first triode connects the anode of described voltage-stabiliser tube; the base stage of described first triode and collector electrode connect the elementary winding of the transformer of described LED power supply driver simultaneously; the emitter of described first triode connects the base stage of described second triode; the collector electrode of described second triode connects the elementary winding of transformer of described LED power supply driver and the feedback signal terminal of PWM wave impulse generating unit, the grounded emitter of described second triode simultaneously.
6. LED power supply driver, it is characterized in that: described LED power supply driver comprises each described output over-voltage protection circuit as claim 1-5.
7. LED power supply driver as claimed in claim 6 is characterized in that, described PWM wave impulse generating unit adopts mosfet driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010100967.9A CN101778511B (en) | 2010-01-22 | 2010-01-22 | Output over-voltage protection circuit and LED power supply driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010100967.9A CN101778511B (en) | 2010-01-22 | 2010-01-22 | Output over-voltage protection circuit and LED power supply driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101778511A true CN101778511A (en) | 2010-07-14 |
| CN101778511B CN101778511B (en) | 2014-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010100967.9A Expired - Fee Related CN101778511B (en) | 2010-01-22 | 2010-01-22 | Output over-voltage protection circuit and LED power supply driver |
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| CN (1) | CN101778511B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN104577961A (en) * | 2013-10-22 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Overvoltage power-off protection circuit |
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| CN2361210Y (en) * | 1998-09-26 | 2000-02-02 | 陈仕平 | Automatic scent-wafting air purifier |
| CN1630449A (en) * | 2003-12-16 | 2005-06-22 | Lg.菲利浦Lcd株式会社 | Apparatus and method for driving lamp of liquid crystal display device |
| CN1909315A (en) * | 2005-08-02 | 2007-02-07 | 艾默生网络能源系统有限公司 | Multi-output power supply and overcurrent detection and protection method thereof |
| WO2007055519A1 (en) * | 2005-11-09 | 2007-05-18 | Yuyang Telecom Co., Ltd | Constant current pulse width modulation driving circuit for light emitting diode |
| CN101051743A (en) * | 2007-02-02 | 2007-10-10 | 艾默生网络能源有限公司 | Over-temperature protection method for transformer in reverse exciting topological power and its application circuit |
| US20080304295A1 (en) * | 2007-06-11 | 2008-12-11 | Chou Chung Fu | Switching Power Converter with a Secondary-Side Control |
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2010
- 2010-01-22 CN CN201010100967.9A patent/CN101778511B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2361210Y (en) * | 1998-09-26 | 2000-02-02 | 陈仕平 | Automatic scent-wafting air purifier |
| CN1630449A (en) * | 2003-12-16 | 2005-06-22 | Lg.菲利浦Lcd株式会社 | Apparatus and method for driving lamp of liquid crystal display device |
| CN1909315A (en) * | 2005-08-02 | 2007-02-07 | 艾默生网络能源系统有限公司 | Multi-output power supply and overcurrent detection and protection method thereof |
| WO2007055519A1 (en) * | 2005-11-09 | 2007-05-18 | Yuyang Telecom Co., Ltd | Constant current pulse width modulation driving circuit for light emitting diode |
| CN101051743A (en) * | 2007-02-02 | 2007-10-10 | 艾默生网络能源有限公司 | Over-temperature protection method for transformer in reverse exciting topological power and its application circuit |
| US20080304295A1 (en) * | 2007-06-11 | 2008-12-11 | Chou Chung Fu | Switching Power Converter with a Secondary-Side Control |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN104577961A (en) * | 2013-10-22 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Overvoltage power-off protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101778511B (en) | 2014-06-25 |
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Granted publication date: 20140625 Termination date: 20190122 |