CN101778511B - 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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- CN101778511B CN101778511B CN201010100967.9A CN201010100967A CN101778511B CN 101778511 B CN101778511 B CN 101778511B CN 201010100967 A CN201010100967 A CN 201010100967A CN 101778511 B CN101778511 B CN 101778511B
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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 the characteristics such as light efficiency is high, energy-efficient, 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 output over-voltage protection function, because in the time of LED power supply driver output overvoltage, and the one, bring dangerous high pressure, the 2nd, can damage driver and light source.
Now also there is the output over-voltage protection circuit for LED power supply driver; but; this output over-voltage protection circuit is to carry out output over-voltage protection according to the secondary winding voltage situation of the transformer of LED power supply driver; the complex structure of this output over-voltage protection circuit; and when after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can not restart LED power supply driver.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of output over-voltage protection circuit, is intended to solve the problem that existing output over-voltage protection circuit exists complex structure and can not restart LED power supply driver.
The embodiment of the present invention is achieved in that a kind of output over-voltage protection circuit, and described output over-voltage protection circuit comprises:
The detecting unit being connected with the armature winding of the transformer of LED power supply driver, the armature winding supply power voltage changing for detection of the described LED power supply driver output voltage of reflection, output detections consequential 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 for receiving described testing result signal, if described testing result signal reflection LED power supply driver output overvoltage, described in output action signal controlling, PWM wave impulse 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, described in output action signal controlling, PWM wave impulse generating unit restarts LED power supply driver,
Described motor unit comprises second switch element and the 3rd switch element, the output of control termination first switch element of second switch element, the control end of second switch element and input connect the armature winding of the transformer of LED power supply driver simultaneously, the control end of output termination the 3rd switch element of second switch element, the input of the 3rd switch element connects the armature winding of transformer and the feedback signal terminal of PWM wave impulse generating unit of LED power supply driver simultaneously;
Described second switch element and the 3rd switch element 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 armature 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 armature winding of transformer and the feedback signal terminal of PWM wave impulse generating unit of LED power supply driver, the grounded emitter of the second triode Q2 simultaneously;
Described motor unit also comprises resistance R 1, resistance R 2, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2 and diode D2, wherein, resistance R 4 and capacitor C 2 are connected in parallel between the base stage and ground of the first triode Q1, resistance R 5 and capacitor C 1 are connected in parallel between the base stage and ground of the second triode Q2, the base stage of first termination the first triode Q1 of resistance R 6, the collector electrode of second termination the first triode Q1 of resistance R 6, the collector electrode of first termination the first triode Q1 of resistance R 2, the collector electrode of second termination the second triode Q2 of resistance R 2, the collector electrode of first termination the first triode Q1 of resistance R 1, the armature winding of the transformer of the second termination LED power supply driver of resistance R 1, the negative electrode of diode D2 connects the collector electrode of the second triode Q2, the anode of diode D2 connects the feedback signal terminal of PWM wave impulse generating unit.
Another object of the embodiment of the present invention is to provide a kind of LED power supply driver of output over-voltage protection circuit described above.
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 LED power supply driver; this output over-voltage protection circuit is simple in structure; and when after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can restart LED power supply driver.
Brief description of the drawings
Fig. 1 is the structure chart of the output over-voltage protection circuit that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit structure chart of the output over-voltage protection circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of the output over-voltage protection circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
Output over-voltage protection circuit comprises detecting unit 100 and motor unit 200, wherein, detecting unit 100 is connected with the armature winding of the transformer of LED power supply driver, the armature winding supply power voltage changing for detection of reflection LED power supply driver output voltage, output detections consequential 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 for receiving testing result signal, if testing result signal reflection LED power supply driver output overvoltage, 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, output action signal controlling PWM wave impulse generating unit 300 restarts LED power supply driver.
Fig. 2 shows the exemplary circuit structure of the output over-voltage protection circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
As one embodiment of the invention, detecting unit 100 comprises the armature winding of the transformer of the input termination LED power supply driver of the first switch element 101, the first switch elements 101, the input of the output termination motor unit 200 of the 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 armature 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 connects the armature winding of transformer and the feedback signal terminal of PWM wave impulse generating unit 300 of LED power supply driver simultaneously.
As one embodiment of the invention, the first switch element 101 is voltage-stabiliser tube Z1, and the negative electrode of voltage-stabiliser tube Z1 connects the armature 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 armature 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 armature winding of transformer and the feedback signal terminal of PWM wave impulse generating unit 300 of LED power supply driver, 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 present 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:
In the time of LED power supply driver output overvoltage, the voltage at the voltage-stabiliser tube Z1 two ends that are connected with the armature winding of the transformer of LED power supply driver exceedes the magnitude of voltage that voltage-stabiliser tube Z1 sets, after voltage-stabiliser tube Z1 is reversed and punctures, first triode Q1 conducting because base potential is elevated, 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, when after output over-voltage Failure elimination, 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, the cathode voltage of diode D2 is drawn high, PWM wave impulse generating unit 300 restarts 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 LED power supply driver; this output over-voltage protection circuit is simple in structure; and when after the output over-voltage trouble shooting of LED power supply driver, this output over-voltage protection circuit can restart LED power supply driver.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. an output over-voltage protection circuit, is characterized in that, described output over-voltage protection circuit comprises:
The detecting unit being connected with the armature winding of the transformer of LED power supply driver, the armature winding supply power voltage changing for detection of the described LED power supply driver output voltage of reflection, output detections consequential 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 for receiving described testing result signal, if described testing result signal reflection LED power supply driver output overvoltage, described in output action signal controlling, PWM wave impulse 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, described in output action signal controlling, PWM wave impulse generating unit restarts LED power supply driver,
Described motor unit comprises second switch element and the 3rd switch element, the output of control termination first switch element of second switch element, the control end of second switch element and input connect the armature winding of the transformer of LED power supply driver simultaneously, the control end of output termination the 3rd switch element of second switch element, the input of the 3rd switch element connects the armature winding of transformer and the feedback signal terminal of PWM wave impulse generating unit of LED power supply driver simultaneously;
Described detecting unit comprises the first switch element, and the first switch element is voltage-stabiliser tube Z1;
Described second switch element and the 3rd switch element 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 negative electrode of voltage-stabiliser tube Z1 connects the armature winding of the transformer of LED power supply driver, the emitter of the first triode Q1 connects the base stage of the second triode Q2, the grounded emitter of the second triode Q2;
Described motor unit also comprises resistance R 1, resistance R 2, resistance R 4, resistance R 5, resistance R 6, capacitor C 1, capacitor C 2 and diode D2, wherein, resistance R 4 and capacitor C 2 are connected in parallel between the base stage and ground of the first triode Q1, resistance R 5 and capacitor C 1 are connected in parallel between the base stage and ground of the second triode Q2, the base stage of first termination the first triode Q1 of resistance R 6, the collector electrode of second termination the first triode Q1 of resistance R 6, the collector electrode of first termination the first triode Q1 of resistance R 2, the collector electrode of second termination the second triode Q2 of resistance R 2, the collector electrode of first termination the first triode Q1 of resistance R 1, the armature winding of the transformer of the second termination LED power supply driver of resistance R 1, the negative electrode of diode D2 connects the collector electrode of the second triode Q2, the anode of diode D2 connects the feedback signal terminal of PWM wave impulse generating unit.
2. a LED power supply driver, is characterized in that: described LED power supply driver comprises output over-voltage protection circuit as claimed in claim 1.
3. LED power supply driver as claimed in claim 2, 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 CN101778511A (en) | 2010-07-14 |
| CN101778511B true 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573182B (en) * | 2010-12-22 | 2014-05-07 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN104577961B (en) * | 2013-10-22 | 2018-09-04 | 深圳市海洋王照明工程有限公司 | Over-pressed power-off protecting circuit |
Citations (5)
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200849777A (en) * | 2007-06-11 | 2008-12-16 | Zhong-Fu Zhou | Secondary-side controlled power converter |
-
2010
- 2010-01-22 CN CN201010100967.9A patent/CN101778511B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
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| CN101778511A (en) | 2010-07-14 |
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