CN103857157A - Lamp open circuit protective system - Google Patents
Lamp open circuit protective system Download PDFInfo
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- CN103857157A CN103857157A CN201210505223.4A CN201210505223A CN103857157A CN 103857157 A CN103857157 A CN 103857157A CN 201210505223 A CN201210505223 A CN 201210505223A CN 103857157 A CN103857157 A CN 103857157A
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Abstract
Provided is a lamp open circuit protective system which is used for disconnecting an access power supply of a lamp when the lamp is in an open-circuit state. The lamp open circuit protective system is characterized by comprising a current detection module, a rectification module, a voltage control module, a voltage-stabilizing module and relay module. The current detection module comprises a current detection resistor R1. The rectification module comprises a rectifier bridge B1. The voltage control module comprises a voltage-dividing resistor R2, a triode Q1 and a triode Q2. The voltage-stabilizing module comprises a voltage-stabilizing diode D1. The relay module comprises a relay K1. When voltage received by the base electrode of the triode Q2 is zero, i.e. no current is detected on the current detection resistor R1, the triode Q2 is cut-off, the base electrode of the triode Q1 is connected with the positive electrode of the power supply via the voltage-dividing resistor R2 and the triode Q1 is conducted. An electronic coil of the relay K1 is electrified and the normally-closed switch of the relay K1 is disconnected. A circuit formed by the lamp and a trigger has not power supply input so that the lamp can be protected from being damaged by high voltage generated by the trigger when the lamp is in the open-circuit state or is damaged.
Description
Technical field
The present invention relates to open loop protection circuit, particularly relate to a kind of simple light fixture open-circuit-protection system.
Background technology
At present a lot of illumination field major parts or the HID(high-voltage gas discharging light of use).HID is exactly the english abbreviation of High intensity Discharge high-voltage gas discharging light, is the general designation of mercury, sodium, gold, xenon lamp, i.e. mercury lamp, sodium vapor lamp, Metal halogen lamp, xenon lamp.Wherein the principle of xenon lamp is in UV-cut uvioresistant crystal quartz glass tube, with number of chemical gas filling, wherein major part is the inert gases such as xenon (Xenon) and iodide, and then through booster (Ballast), low pressure (as 12 volts) direct voltage moment is pressurized to 4-5KV, excite the xenon electronics in quartz ampoule free through high pressure amplitude of vibration, between two electrodes, produce light source.HID light source needs high pressure (4-5KV) triggering just can light in the time starting.When HID light source is in the time opening a way or damage, provide the trigger of high pressure can constantly send high pressure, the life-span that can affect light fixture safety and reduce electric elements in circuit like this.
Summary of the invention
Based on this, provide a kind of light fixture open-circuit-protection system that disconnects the access power supply of light fixture at light fixture in the time opening a way.
A kind of light fixture open-circuit-protection system, for disconnect the access power supply of light fixture in the time opening a way at light fixture, comprises current detection module, rectification module, voltage control module, Voltage stabilizing module and relay module;
Described current detection module comprises current sense resistor R1, described rectification module comprises rectifier bridge B1, described voltage control module comprises divider resistance R2, triode Q1 and triode Q2, and described Voltage stabilizing module comprises voltage stabilizing didoe D1, and described relay module comprises relay K 1;
Described current sense resistor R1 one end is for being connected with the live wire of AC power, and the other end of described current sense resistor R1 is connected with light fixture;
The input of described rectifier bridge B1 is connected to the two ends of current sense resistor R1, the earth terminal ground connection of described rectifier bridge B1, and the output of described rectifier bridge B1 is connected with the base stage of described triode Q2;
The collector electrode of described triode Q2 is connected with the base stage of described triode Q1, the equal ground connection of emitter of described triode Q1 and described triode Q2, and one end of described divider resistance R2 is connected with positive source, and the other end is connected with the base stage of described triode Q1;
One end of the electronic coil of described relay K 1 is connected with the collector electrode of described triode Q1, the other end of the electronic coil of described relay K 1 is for being connected with positive source, and the normally closed switch of described relay K 1 is series between the live wire and current sense resistor R1 of described AC power;
The positive pole of described voltage stabilizing didoe D1 connects for positive source, and the negative pole of described voltage stabilizing didoe D1 is connected with the collector electrode of described triode Q1.
In an embodiment, also comprise filter capacitor C2 therein, one end of described filter capacitor C2 is connected with the output of described rectifier bridge B1, the other end ground connection of described filter capacitor C2.
In an embodiment, also comprise current-limiting resistance R3 therein, one end of described current-limiting resistance R3 is connected with the output of described rectifier bridge B1, and the other end of described current-limiting resistance R3 is connected with the base stage of described triode Q2.
In an embodiment, also comprise inductance L 1 therein, one end of described inductance L 1 is connected with the zero line of AC power, and the other end of described inductance L 1 is for being connected with trigger.
In an embodiment, also comprise capacitor C 1 therein, described capacitor C 1 is parallel between the zero line and live wire of described AC power.
Above-mentioned light fixture open loop protection circuit detects the electric current in light fixture and trigger forming circuit by current sense resistor R1, and will detect that by rectifier bridge B1 current conversion becomes voltage transmission to triode Q2.When the voltage receiving when the base stage of triode Q2 is high voltage, current sense resistor R1 detects electric current, triode Q2 conducting, and the collector electrode output low level of triode Q2, thereby triode Q1 cut-off, relay K 1 is failure to actuate.The circuit that light fixture and trigger form is normally worked.In the time that the base stage of triode Q2 receives voltage and is zero, current sense resistor R1 does not detect electric current, triode Q2 cut-off, and the base stage of triode Q1 is connected with positive source by divider resistance R2, triode Q1 conducting.The electronic coil of relay K 1 obtains electric, and the normally closed switch of relay K 1 disconnects.The circuit that light fixture and trigger form does not have power supply input, thus can be at light fixture in open circuit or while damaging, the protection light fixture high pressure that device sends that is not triggered damages.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of light fixture open-circuit-protection system.
Embodiment
As shown in Figure 1, be the circuit theory diagrams of light fixture open-circuit-protection system.
A kind of light fixture open-circuit-protection system, for disconnect the access power supply of light fixture in the time opening a way at light fixture, comprises current detection module 101, rectification module 103, voltage control module 105, Voltage stabilizing module 107 and relay module 109.
Current detection module 101 comprises current sense resistor R1, rectification module 103 comprises rectifier bridge B1, voltage control module 105 comprises divider resistance R2, triode Q1 and triode Q2, and Voltage stabilizing module 107 comprises voltage stabilizing didoe D1, and relay module 109 comprises relay K 1.
Current sense resistor R1 one end is for being connected with the live wire of AC power, and the other end of current sense resistor R1 is connected with light fixture.
The input of rectifier bridge B1 is connected to the two ends of current sense resistor R1, the earth terminal ground connection of rectifier bridge B1, and the output of rectifier bridge B1 is connected with the base stage of triode Q2.
The collector electrode of triode Q2 is connected with the base stage of triode Q1, the equal ground connection of emitter of triode Q1 and triode Q2, and one end of divider resistance R2 is connected with positive source, and the other end is connected with the base stage of triode Q1.
One end of the electronic coil of relay K 1 is connected with the collector electrode of triode Q1, and the other end of the electronic coil of relay K 1 is for being connected with positive source, and the normally closed switch of relay K 1 is series between the live wire and current sense resistor R1 of AC power.
The positive pole of voltage stabilizing didoe D1 connects for positive source, and the negative pole of voltage stabilizing didoe D1 is connected with the collector electrode of triode Q1.
Light fixture open-circuit-protection system also comprises filter capacitor C2, and one end of filter capacitor C2 is connected with the output of rectifier bridge B1, the other end ground connection of filter capacitor C2.
Light fixture open-circuit-protection system also comprises current-limiting resistance R3, and one end of current-limiting resistance R3 is connected with the output of rectifier bridge B1, and the other end of current-limiting resistance R3 is connected with the base stage of triode Q2.
Light fixture open-circuit-protection system also comprises inductance L 1, and one end of inductance L 1 is connected with the zero line of AC power, and the other end of inductance L 1 is for being connected with trigger.
Light fixture open-circuit-protection system also comprises capacitor C 1, and capacitor C 1 is parallel between the zero line and live wire of AC power.
Based on above-mentioned all embodiment, the operation principle of light fixture open-circuit-protection system is as follows:
When light fixture and trigger forming circuit are normally worked, on current sense resistor R1, there is electric current process.Thereby there is pressure drop at current sense resistor R1 two ends, the input of rectifier bridge B1 has input voltage.Rectifier bridge B1 by current-limiting resistance R3 by voltage transmission to triode Q2, when the base stage of triode Q2 receives high level, triode Q2 conducting, thereby the collector electrode output low level of triode Q2, the base voltage that makes triode Q1 is low level, triode Q1 cut-off.On the electronic coil of relay K 1, there is no voltage, relay K 1 is failure to actuate, and the normally closed switch of relay K 1 remains closed.The circuit that light fixture and trigger form still keeps normal work.
In the time of open circuit that light fixture and trigger form, on current sense resistor R1, there is no electric current process.The level that process rectifier bridge B1 and current-limiting resistance R3 are transferred in triode Q2 base stage is low level, triode Q2 cut-off.Now the base stage of triode Q1 is connected with positive source by divider resistance R2, triode Q1 conducting.The electronic coil of relay K 1 obtains electric, and the normally closed switch of relay K 1 disconnects, and disconnected the access power supply of the circuit that light fixture and trigger form, thereby trigger cannot send triggering high pressure, has avoided the light fixture high pressure damage that is triggered.
Voltage stabilizing didoe D1, in the time of triode Q1 conducting, for triode Q1 provides stable pressure drop, makes triode Q1 keep conducting.
Above-mentioned light fixture open loop protection circuit detects the electric current in light fixture and trigger forming circuit by current sense resistor R1, and will detect that by rectifier bridge B1 current conversion becomes voltage transmission to triode Q2.When the voltage receiving when the base stage of triode Q2 is high voltage, current sense resistor R1 detects electric current, triode Q2 conducting, and the collector electrode output low level of triode Q2, thereby triode Q1 cut-off, relay K 1 is failure to actuate.The circuit that light fixture and trigger form is normally worked.In the time that the base stage of triode Q2 receives voltage and is zero, current sense resistor R1 does not detect electric current, triode Q2 cut-off, and the base stage of triode Q1 is connected with positive source by divider resistance R2, triode Q1 conducting.The electronic coil of relay K 1 obtains electric, and the normally closed switch of relay K 1 disconnects.The circuit that light fixture and trigger form does not have power supply input, thus can be at light fixture in open circuit or while damaging, the protection light fixture high pressure that device sends that is not triggered damages.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1. a light fixture open-circuit-protection system, for disconnect the access power supply of light fixture in the time opening a way at light fixture, is characterized in that, comprises current detection module, rectification module, voltage control module, Voltage stabilizing module and relay module;
Described current detection module comprises current sense resistor R1, described rectification module comprises rectifier bridge B1, described voltage control module comprises divider resistance R2, triode Q1 and triode Q2, and described Voltage stabilizing module comprises voltage stabilizing didoe D1, and described relay module comprises relay K 1;
Described current sense resistor R1 one end is for being connected with the live wire of AC power, and the other end of described current sense resistor R1 is connected with light fixture;
The input of described rectifier bridge B1 is connected to the two ends of current sense resistor R1, the earth terminal ground connection of described rectifier bridge B1, and the output of described rectifier bridge B1 is connected with the base stage of described triode Q2;
The collector electrode of described triode Q2 is connected with the base stage of described triode Q1, the equal ground connection of emitter of described triode Q1 and described triode Q2, and one end of described divider resistance R2 is connected with positive source, and the other end is connected with the base stage of described triode Q1;
One end of the electronic coil of described relay K 1 is connected with the collector electrode of described triode Q1, the other end of the electronic coil of described relay K 1 is for being connected with positive source, and the normally closed switch of described relay K 1 is series between the live wire and current sense resistor R1 of described AC power;
The positive pole of described voltage stabilizing didoe D1 connects for positive source, and the negative pole of described voltage stabilizing didoe D1 is connected with the collector electrode of described triode Q1.
2. light fixture open-circuit-protection system according to claim 1, is characterized in that, also comprises filter capacitor C2, and one end of described filter capacitor C2 is connected with the output of described rectifier bridge B1, the other end ground connection of described filter capacitor C2.
3. light fixture open-circuit-protection system according to claim 1; it is characterized in that; also comprise current-limiting resistance R3, one end of described current-limiting resistance R3 is connected with the output of described rectifier bridge B1, and the other end of described current-limiting resistance R3 is connected with the base stage of described triode Q2.
4. light fixture open-circuit-protection system according to claim 1, is characterized in that, also comprises inductance L 1, and one end of described inductance L 1 is connected with the zero line of AC power, and the other end of described inductance L 1 is for being connected with trigger.
5. light fixture open-circuit-protection system according to claim 1, is characterized in that, also comprises capacitor C 1, and described capacitor C 1 is parallel between the zero line and live wire of described AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505223.4A CN103857157B (en) | 2012-11-30 | 2012-11-30 | Light fixture open-circuit-protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505223.4A CN103857157B (en) | 2012-11-30 | 2012-11-30 | Light fixture open-circuit-protection system |
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| CN103857157A true CN103857157A (en) | 2014-06-11 |
| CN103857157B CN103857157B (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210505223.4A Active CN103857157B (en) | 2012-11-30 | 2012-11-30 | Light fixture open-circuit-protection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093250A (en) * | 2014-07-07 | 2014-10-08 | 电子科技大学 | Open circuit over-voltage protection device used for LED drive circuit |
| CN105251584A (en) * | 2014-07-15 | 2016-01-20 | 上海震旦办公设备有限公司 | Mechanical paper-full detection device for paper shredder |
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| WO2005046293A1 (en) * | 2003-11-10 | 2005-05-19 | Matsushita Electric Works, Ltd. | High-pressure discharge lamp operation device and illumination instrument |
| CN2932912Y (en) * | 2006-01-23 | 2007-08-08 | 达方电子股份有限公司 | Light tube driving circuit |
| CN101451693A (en) * | 2007-11-30 | 2009-06-10 | 深圳市海洋王投资发展有限公司 | Lamp protection method and device, and lamp using the protection arrangement |
| CN101707828A (en) * | 2009-05-20 | 2010-05-12 | 海洋王照明科技股份有限公司 | Constant-current source driving circuit with open circuit protection and adopting LED |
-
2012
- 2012-11-30 CN CN201210505223.4A patent/CN103857157B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005046293A1 (en) * | 2003-11-10 | 2005-05-19 | Matsushita Electric Works, Ltd. | High-pressure discharge lamp operation device and illumination instrument |
| CN2932912Y (en) * | 2006-01-23 | 2007-08-08 | 达方电子股份有限公司 | Light tube driving circuit |
| CN101451693A (en) * | 2007-11-30 | 2009-06-10 | 深圳市海洋王投资发展有限公司 | Lamp protection method and device, and lamp using the protection arrangement |
| CN101707828A (en) * | 2009-05-20 | 2010-05-12 | 海洋王照明科技股份有限公司 | Constant-current source driving circuit with open circuit protection and adopting LED |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093250A (en) * | 2014-07-07 | 2014-10-08 | 电子科技大学 | Open circuit over-voltage protection device used for LED drive circuit |
| CN104093250B (en) * | 2014-07-07 | 2016-04-27 | 电子科技大学 | A kind of open circuit over-pressure safety device for LED drive circuit |
| CN105251584A (en) * | 2014-07-15 | 2016-01-20 | 上海震旦办公设备有限公司 | Mechanical paper-full detection device for paper shredder |
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| Publication number | Publication date |
|---|---|
| CN103857157B (en) | 2016-04-13 |
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