CN103390878A - Lamp power output overvoltage protection circuit and lamp - Google Patents
Lamp power output overvoltage protection circuit and lamp Download PDFInfo
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- CN103390878A CN103390878A CN2012101376446A CN201210137644A CN103390878A CN 103390878 A CN103390878 A CN 103390878A CN 2012101376446 A CN2012101376446 A CN 2012101376446A CN 201210137644 A CN201210137644 A CN 201210137644A CN 103390878 A CN103390878 A CN 103390878A
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Abstract
The invention is suitable for the field of lighting circuits and particularly relates to a lamp power output overvoltage protection circuit and a lamp. According to the lamp power output overvoltage protection circuit and the lamp, the lamp power output overvoltage protection circuit is respectively connected with a voltage detection circuit and a power output control circuit, the lamp power output overvoltage protection circuit judges whether overvoltage of the power output occurs or not and controls the power output control circuit to control the output of a power supply by receiving a detection signal sent by the voltage detection circuit.
Description
Technical field
The invention belongs to the lighting circuit field, relate in particular to a kind of lamp power output overvoltage protection circuit and light fixture.
Background technology
Light fixture is widely used in the middle of daily life as a kind of electric equipment products of routine.
The high voltage that existing power supply output overvoltage protection circuit is the Direct Sampling output removes to feed back to front end, and as shown in Figure 1, when Uo1 output raises, voltage-stabiliser tube Z1 punctures conducting, and the control end of controllable silicon SCR obtains trigger voltage, so the controllable silicon SCR conducting.The Uo2 shorted to earth, overcurrent protection or short-circuit protection circuit will be started working, and stop whole power circuit work.
But, when existing power supply output overvoltage protection circuit is used for the output protection of high voltage out-put supply, can cause the Electro Magnetic Compatibility of circuit poor.
Summary of the invention
The object of the present invention is to provide a kind of lamp power output overvoltage protection circuit, be intended to solve the existence of existing power supply output overvoltage protection circuit and can cause the poor problem of Electro Magnetic Compatibility of circuit.
The present invention is achieved in that a kind of lamp power output overvoltage protection circuit, connects respectively voltage detecting circuit, reference voltage source and power supply output control circuit, and described lamp power output overvoltage protection circuit comprises:
Voltage-stabiliser tube Z1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, photoelectrical coupler U1 and switching tube;
the negative electrode of described voltage-stabiliser tube Z1 connects described voltage detecting circuit, described resistance R 1 and resistance R 2 are serially connected between the anode and ground of described voltage-stabiliser tube Z1, the anode of the luminous tube of described photoelectrical coupler U1 connects the anode of described voltage-stabiliser tube Z1, the negative electrode of the luminous tube of described photoelectrical coupler U1 connects the common port of described resistance R 1 and resistance R 2, the collector electrode of the phototriode of described photoelectrical coupler U1 connects described reference voltage source by described resistance R 3, the emitter of the phototriode of described photoelectrical coupler U1 connects the control end of described switching tube by described resistance R 5, described resistance R 4 is connected between the emitter and ground of phototriode of described photoelectrical coupler U1, described capacitor C 1 is connected between the control end and ground of described switching tube, the cold end ground connection of described switching tube, the described power supply output control circuit of the high potential termination of described switching tube.
Another object of the present invention is to provide a kind of light fixture; comprise voltage detecting circuit, reference voltage source and power supply output control circuit; and the lamp power output overvoltage protection circuit that connects respectively described voltage detecting circuit, reference voltage source and power supply output control circuit, described lamp power output overvoltage protection circuit comprises:
Voltage-stabiliser tube Z1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, photoelectrical coupler U1 and switching tube;
the negative electrode of described voltage-stabiliser tube Z1 connects described voltage detecting circuit, described resistance R 1 and resistance R 2 are serially connected between the anode and ground of described voltage-stabiliser tube Z1, the anode of the luminous tube of described photoelectrical coupler U1 connects the anode of described voltage-stabiliser tube Z1, the negative electrode of the luminous tube of described photoelectrical coupler U1 is by the common port of described resistance R 1 with resistance R 2, the collector electrode of the phototriode of described photoelectrical coupler U1 connects described reference voltage source by described resistance R 3, the emitter of the phototriode of described photoelectrical coupler U1 connects the control end of described switching tube by described resistance R 5, described resistance R 4 is connected between the emitter and ground of phototriode of described photoelectrical coupler U1, described capacitor C 1 is connected between the control end and ground of described switching tube, the cold end ground connection of described switching tube, the described power supply output control circuit of the high potential termination of described switching tube.
In the present invention; the lamp power output overvoltage protection circuit connects respectively voltage detecting circuit and power supply output control circuit; the detection signal that sends by the receiver voltage testing circuit; the lamp power output overvoltage protection circuit judges that power supply exports whether overvoltage; and control the power supply output control circuit, make it control the output of power supply.
Description of drawings
Fig. 1 is the circuit structure diagram of existing lamp power output overvoltage protection circuit;
Fig. 2 is the circuit structure diagram of the lamp power output overvoltage protection circuit that provides of first embodiment of the invention;
Fig. 3 is the circuit structure diagram of the lamp power output overvoltage protection circuit that provides of second embodiment of the invention.
Embodiment
, in order to make purpose 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. 2 shows the circuit structure of the lamp power output overvoltage protection circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
A kind of lamp power output overvoltage protection circuit 100, connect respectively voltage detecting circuit 200, reference voltage source 300 and power supply output control circuit 400, and lamp power output overvoltage protection circuit 100 comprises:
Voltage-stabiliser tube Z1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, photoelectrical coupler U1 and switching tube 101;
the negative electrode of voltage-stabiliser tube Z1 connects voltage detecting circuit 200, resistance R 1 and resistance R 2 are serially connected between the anode and ground of voltage-stabiliser tube Z1, the anode of the luminous tube of photoelectrical coupler U1 connects the anode of voltage-stabiliser tube Z1, the negative electrode connecting resistance R1 of the luminous tube of photoelectrical coupler U1 and the common port of resistance R 2, the collector electrode of the phototriode of photoelectrical coupler U1 connects reference voltage source 300 by resistance R 3, the emitter of the phototriode of photoelectrical coupler U1 connects the control end of switching tube 101 by resistance R 5, resistance R 4 is connected between the emitter and ground of phototriode of photoelectrical coupler U1, capacitor C 1 is connected between the control end and ground of switching tube, the cold end ground connection of switching tube 101, the high potential termination power supply output control circuit 400 of switching tube 101.
As one embodiment of the invention, switching tube 101 adopts NPN type triode Q1, and the base stage of NPN type triode Q1 is the control end of switching tube 101, and the collector electrode of NPN type triode Q1 connects power supply output control circuit 400, the grounded emitter of NPN type triode Q1.
Fig. 3 shows the circuit structure of the lamp power output overvoltage protection circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
As one embodiment of the invention, switching tube 101 adopts N-type metal-oxide-semiconductor Q2, and the grid of N-type metal-oxide-semiconductor Q2 is the control end of switching tube 101, and the drain electrode of N-type metal-oxide-semiconductor Q2 connects power supply output control circuit 400, the source ground of N-type metal-oxide-semiconductor Q2.
Adopt NPN type triode Q1 as example take switching tube 101, the operation principle of lamp power output overvoltage protection circuit 100 described:
When voltage detecting circuit 200 detects the power supply output overvoltage, voltage-stabiliser tube Z1 punctures conducting, produce loop through photoelectrical coupler U1, resistance R 2 to ground, the lumination of light emitting diode of photoelectrical coupler U1, thereby make the phototriode conducting of photoelectrical coupler U1, NPN type triode Q1 conducting, make power supply output control circuit 400 access low levels, this power supply output control circuit 400 is controlled the closed front end chip, stops whole power work.
The embodiment of the present invention also provides a kind of light fixture; comprise voltage detecting circuit 200, reference voltage source 300, power supply output control circuit 400 and lamp power output overvoltage protection circuit 100 as above, lamp power output overvoltage protection circuit 100 connects respectively voltage detecting circuit 200, reference voltage source 300 and power supply output control circuit 400.
In embodiments of the present invention; the lamp power output overvoltage protection circuit connects respectively voltage detecting circuit and power supply output control circuit; the detection signal that sends by the receiver voltage testing circuit; the lamp power output overvoltage protection circuit judges that power supply exports whether overvoltage; and control the power supply output control circuit, make it control the output of power supply.
The foregoing is only preferred embodiment of the present invention,, not in order to limit the present invention, all any modifications 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 (6)
1. a lamp power output overvoltage protection circuit, connect respectively voltage detecting circuit, reference voltage source and power supply output control circuit, it is characterized in that, described lamp power output overvoltage protection circuit comprises:
Voltage-stabiliser tube Z1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, photoelectrical coupler U1 and switching tube;
the negative electrode of described voltage-stabiliser tube Z1 connects described voltage detecting circuit, described resistance R 1 and resistance R 2 are serially connected between the anode and ground of described voltage-stabiliser tube Z1, the anode of the luminous tube of described photoelectrical coupler U1 connects the anode of described voltage-stabiliser tube Z1, the negative electrode of the luminous tube of described photoelectrical coupler U1 connects the common port of described resistance R 1 and resistance R 2, the collector electrode of the phototriode of described photoelectrical coupler U1 connects described reference voltage source by described resistance R 3, the emitter of the phototriode of described photoelectrical coupler U1 connects the control end of described switching tube by described resistance R 5, described resistance R 4 is connected between the emitter and ground of phototriode of described photoelectrical coupler U1, described capacitor C 1 is connected between the control end and ground of described switching tube, the cold end ground connection of described switching tube, the described power supply output control circuit of the high potential termination of described switching tube.
2. lamp power output overvoltage protection circuit as claimed in claim 1; it is characterized in that; described switching tube adopts NPN type triode Q1; the base stage of described NPN type triode Q1 is the control end of switching tube; the collector electrode of described NPN type triode Q1 connects described power supply output control circuit, the grounded emitter of described NPN type triode Q1.
3. lamp power output overvoltage protection circuit as claimed in claim 1; it is characterized in that; described switching tube adopts N-type metal-oxide-semiconductor Q2; the grid of described N-type metal-oxide-semiconductor Q2 is the control end of switching tube; the drain electrode of described N-type metal-oxide-semiconductor Q2 connects described power supply output control circuit, the source ground of described N-type metal-oxide-semiconductor Q2.
4. light fixture; comprise voltage detecting circuit, reference voltage source and power supply output control circuit; and the lamp power output overvoltage protection circuit that connects respectively described voltage detecting circuit, reference voltage source and power supply output control circuit; it is characterized in that, described lamp power output overvoltage protection circuit comprises:
Voltage-stabiliser tube Z1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, capacitor C 1, photoelectrical coupler U1 and switching tube;
the negative electrode of described voltage-stabiliser tube Z1 connects described voltage detecting circuit, described resistance R 1 and resistance R 2 are serially connected between the anode and ground of described voltage-stabiliser tube Z1, the anode of the luminous tube of described photoelectrical coupler U1 connects the anode of described voltage-stabiliser tube Z1, the negative electrode of the luminous tube of described photoelectrical coupler U1 connects the common port of described resistance R 1 and resistance R 2, the collector electrode of the phototriode of described photoelectrical coupler U1 connects described reference voltage source by described resistance R 3, the emitter of the phototriode of described photoelectrical coupler U1 connects the control end of described switching tube by described resistance R 5, described resistance R 4 is connected between the emitter and ground of phototriode of described photoelectrical coupler U1, described capacitor C 1 is connected between the control end and ground of described switching tube, the cold end ground connection of described switching tube, the described power supply output control circuit of the high potential termination of described switching tube.
5. light fixture as claimed in claim 4, it is characterized in that, described switching tube adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is the control end of switching tube, the collector electrode of described NPN type triode Q1 connects described power supply output control circuit, the grounded emitter of described NPN type triode Q1.
6. light fixture as claimed in claim 4, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q2, and the grid of described N-type metal-oxide-semiconductor Q2 is the control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q2 connects described power supply output control circuit, the source ground of described N-type metal-oxide-semiconductor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101376446A CN103390878A (en) | 2012-05-07 | 2012-05-07 | Lamp power output overvoltage protection circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101376446A CN103390878A (en) | 2012-05-07 | 2012-05-07 | Lamp power output overvoltage protection circuit and lamp |
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| CN103390878A true CN103390878A (en) | 2013-11-13 |
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| CN2012101376446A Pending CN103390878A (en) | 2012-05-07 | 2012-05-07 | Lamp power output overvoltage protection circuit and lamp |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105898935A (en) * | 2016-06-14 | 2016-08-24 | 安徽师范大学 | Anti-reverse connection and soft-starting circuit for LED drive power supply |
| CN107204605A (en) * | 2017-07-05 | 2017-09-26 | 佛山杰致信息科技有限公司 | The overvoltage crowbar of power distribution cabinet |
| CN107528288A (en) * | 2017-08-21 | 2017-12-29 | 深圳市华星光电技术有限公司 | The power circuit and display of a kind of display |
| CN108736872A (en) * | 2018-04-26 | 2018-11-02 | 西安微电子技术研究所 | A kind of ignition drive circuit |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| WO2020077783A1 (en) * | 2018-10-19 | 2020-04-23 | 深圳市华星光电技术有限公司 | Drive circuit and display device |
| CN111182699A (en) * | 2018-10-24 | 2020-05-19 | 殷创科技（上海）有限公司 | Intelligent adjustable vehicle-mounted driver and passenger monitoring light source |
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| CN2370444Y (en) * | 1998-10-20 | 2000-03-22 | 梁民鑫 | Anti-interference road lamp controller |
| CN2440298Y (en) * | 2000-08-04 | 2001-07-25 | 张进 | Road-lamp automatic controlling device |
| CN1738124A (en) * | 2004-08-18 | 2006-02-22 | 华为技术有限公司 | Alarm circuit |
| CN101378187A (en) * | 2007-08-29 | 2009-03-04 | 鸿富锦精密工业（深圳）有限公司 | Power supply protection circuit |
| CN101742784A (en) * | 2010-01-29 | 2010-06-16 | 海洋王照明科技股份有限公司 | LED lamp and drive circuit thereof |
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| CN2370444Y (en) * | 1998-10-20 | 2000-03-22 | 梁民鑫 | Anti-interference road lamp controller |
| CN2440298Y (en) * | 2000-08-04 | 2001-07-25 | 张进 | Road-lamp automatic controlling device |
| CN1738124A (en) * | 2004-08-18 | 2006-02-22 | 华为技术有限公司 | Alarm circuit |
| CN101378187A (en) * | 2007-08-29 | 2009-03-04 | 鸿富锦精密工业（深圳）有限公司 | Power supply protection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105898935A (en) * | 2016-06-14 | 2016-08-24 | 安徽师范大学 | Anti-reverse connection and soft-starting circuit for LED drive power supply |
| CN107204605A (en) * | 2017-07-05 | 2017-09-26 | 佛山杰致信息科技有限公司 | The overvoltage crowbar of power distribution cabinet |
| CN107528288A (en) * | 2017-08-21 | 2017-12-29 | 深圳市华星光电技术有限公司 | The power circuit and display of a kind of display |
| CN108736872A (en) * | 2018-04-26 | 2018-11-02 | 西安微电子技术研究所 | A kind of ignition drive circuit |
| WO2020077783A1 (en) * | 2018-10-19 | 2020-04-23 | 深圳市华星光电技术有限公司 | Drive circuit and display device |
| CN111182699A (en) * | 2018-10-24 | 2020-05-19 | 殷创科技（上海）有限公司 | Intelligent adjustable vehicle-mounted driver and passenger monitoring light source |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| CN110635457B (en) * | 2019-11-12 | 2022-03-29 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
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Application publication date: 20131113 |