CN103369758A - Light fixture protection circuit and light fixture protection device - Google Patents
Light fixture protection circuit and light fixture protection device Download PDFInfo
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- CN103369758A CN103369758A CN201210093477XA CN201210093477A CN103369758A CN 103369758 A CN103369758 A CN 103369758A CN 201210093477X A CN201210093477X A CN 201210093477XA CN 201210093477 A CN201210093477 A CN 201210093477A CN 103369758 A CN103369758 A CN 103369758A
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Abstract
The invention discloses a light fixture protection circuit. The circuit comprises a temperature sensitive module for monitoring the temperature of a light fixture and outputting the voltage changing with the temperature, a trigger module outputting a trigger electrical signal according to the voltage correspondingly outputted by the temperature sensitive module when the temperature of the light fixture exceeds a preset value, and a switch module, wherein the input terminal of the trigger module is connected with the voltage output terminal of the temperature sensitive module, the output terminal of the trigger module is connected with the control terminal of the switch module, and the trigger electrical signal outputted by the trigger module triggers the switch module for controlling the light fixture to stop working. The temperature sensitive module is arranged for monitoring the light fixture in the light fixture protection circuit, the outputted voltage of the temperature sensitive module changes with the temperature of the light mixture, and the voltage value that the temperature sensitive module outputs with a temperature rise becomes larger until a voltage-regulator diode is reversely conducted so that the trigger electrical signal outputted by the trigger module triggers the switch module for controlling the turning-on and turning-off of the power supply of the light fixture, thus the light fixture stops working and over-temperature protection is realized. Furthermore, disclosed is also a light fixture protection device.
Description
Technical field
The present invention relates to light fixture protection field, particularly relate to a kind of light fixture protective circuit and device.
Background technology
At present, development along with society's science and technology, the design and fabrication ability of light fixture is improving constantly, but light fixture in use, the shortcoming of its heating or heat insulation aspect also not can solve, and in some special light fixture particular application, and the temperature of light fixture is had strict demand, in case the temperature of setting occurred being higher than, then light fixture breaks down easily or directly damages and can not use.
Summary of the invention
Based on this, when being necessary the excess Temperature for light fixture, the problem that light fixture breaks down easily or directly damages, provide a kind of when excess Temperature the not impaired light fixture protective circuit of protection light fixture.
In addition, when being necessary the excess Temperature for light fixture, the problem that light fixture breaks down easily or directly damages, provide a kind of when excess Temperature the not impaired light fixture protective device of protection light fixture.
A kind of light fixture protective circuit, comprise that the temperature sensitive module for monitoring lamp temperatures and exportable temperature variant voltage, the Voltage-output of the corresponding output of temperature sensitive module when basis surpasses predetermined value with lamp temperatures trigger trigger module and the switch module of the signal of telecommunication, the input of described trigger module is connected with the voltage output end of described temperature sensitive module, the output of described trigger module is connected with the control end of described switch module, and the triggering signal of telecommunication of described trigger module output triggers described switch module and controls described light fixture and quit work;
Described temperature sensitive module becomes large with the magnitude of voltage of temperature rising output, described trigger module comprises voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the voltage output end of described temperature sensitive module, the anode of described voltage stabilizing didoe is electrically connected with the control end of described switch module, and the magnitude of voltage of described voltage stabilizing didoe reverse-conducting is less than the magnitude of voltage of the corresponding output of temperature sensitive module when lamp temperatures surpasses predetermined value.
Among embodiment, described trigger module also comprises photoelectric coupling unit for promoting inhibition, divider resistance R1 and divider resistance R3 therein, wherein,
The anode of described voltage stabilizing didoe is connected with the input of the light emitting source of described photoelectric coupling unit for promoting inhibition by described divider resistance R1, the output head grounding of the light emitting source of described photoelectric coupling unit for promoting inhibition, the input of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with DC power supply by described divider resistance R3, and the output of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with the control end of described switch module.
Among embodiment, described switch module comprises switching tube Q2, earth resistance R2 and resistance R 4 therein, wherein,
The control end of described switching tube Q2 is connected with DC power supply by described resistance R 4 as the input of the described switching tube Q2 of the control end of described switch module, and the output of described switching tube Q2 passes through described earth resistance R2 ground connection as the output of described switch module.
Among embodiment, described switch module also comprises switching tube Q1, resistance R 5, resistance R 6 and earth resistance R7 therein, wherein,
The control end of described switching tube Q1 is connected, is connected with DC power supply by described resistance R 5 with the output of described switching tube Q2 by described resistance R 4 simultaneously, the input of described switching tube Q1 is connected with described DC power supply by described resistance R 6, and the output of described switching tube Q1 is by described earth resistance R7 ground connection.
Among embodiment, described switching tube Q1 is the positive-negative-positive triode therein, and described switching tube Q2 is NPN type triode.
Among embodiment, described temperature sensitive module is temperature sensitive chip therein.
A kind of light fixture protective device, comprise the light fixture protective circuit, described light fixture protective circuit comprises the temperature sensitive module for monitoring lamp temperatures and exportable temperature variant voltage, trigger module and the switch module of the Voltage-output triggering signal of telecommunication of the corresponding output of temperature sensitive module when surpassing predetermined value with lamp temperatures, the input of described trigger module is connected with the voltage output end of described temperature sensitive module, the output of described trigger module is connected with the control end of described switch module, and the triggering signal of telecommunication of described trigger module output triggers described switch module and controls described light fixture and quit work;
Described temperature sensitive module becomes large with the magnitude of voltage of temperature rising output, described trigger module comprises voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the voltage output end of described temperature sensitive module, the anode of described voltage stabilizing didoe is electrically connected with the control end of described switch module, and the magnitude of voltage of described voltage stabilizing didoe reverse-conducting is less than the magnitude of voltage of the corresponding output of temperature sensitive module when lamp temperatures surpasses predetermined value.
Among embodiment, described trigger module also comprises photoelectric coupling unit for promoting inhibition, divider resistance R1 and divider resistance R3 therein, wherein,
The anode of described voltage stabilizing didoe is connected with the input of the light emitting source of described photoelectric coupling unit for promoting inhibition by described divider resistance R1, the output head grounding of the light emitting source of described photoelectric coupling unit for promoting inhibition, the input of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with DC power supply by described divider resistance R3, and the output of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with the control end of described switch module.
Among embodiment, described switch module comprises switching tube Q2, earth resistance R2 and resistance R 4 therein, wherein,
The control end of described switching tube Q2 is connected with DC power supply by described resistance R 4 as the input of the described switching tube Q2 of the control end of described switch module, and the output of described switching tube Q2 passes through described earth resistance R2 ground connection as the output of described switch module.
Among embodiment, described switch module also comprises switching tube Q1, resistance R 5, resistance R 6 and earth resistance R7 therein, wherein,
The control end of described switching tube Q1 is connected, is connected with DC power supply by described resistance R 5 with the output of described switching tube Q2 by described resistance R 4 simultaneously, the input of described switching tube Q1 is connected with described DC power supply by described resistance R 6, and the output of described switching tube Q1 is by described earth resistance R7 ground connection.
Among embodiment, described switching tube Q1 is the positive-negative-positive triode therein, and described switching tube Q2 is NPN type triode.
Above-mentioned light fixture protective circuit arranges temperature sensitive module monitors light fixture; its output voltage changes with the variations in temperature of light fixture; temperature sensitive module becomes greatly to the voltage stabilizing didoe reverse-conducting with the magnitude of voltage of temperature rising output; so that the triggering signal of telecommunication of trigger module output is with the switch of trigger switch module controls lamp power; light fixture is quit work, realize the excess Temperature protection.In addition, a kind of light fixture protective device is also disclosed.
Description of drawings
Fig. 1 is the structured flowchart of the light fixture protective circuit in the preferred embodiment;
Fig. 2 is the circuit theory diagrams of the light fixture protective circuit in the preferred embodiment.
Embodiment
As shown in Figure 1, be the light fixture protective circuit of an embodiment.This light fixture protective circuit comprises: trigger trigger module 120 and the switch module 130 of the signal of telecommunication for the temperature sensitive module 110 of monitoring lamp temperatures and exportable temperature variant voltage, the Voltage-output of temperature sensitive module 110 corresponding outputs when basis surpasses predetermined value with lamp temperatures; the input of trigger module 120 is connected with the voltage output end of temperature sensitive module 110; the output of trigger module 120 is connected with the control end of switch module 130, and the triggering signal of telecommunication trigger switch module 130 control light fixtures of trigger module 120 outputs quit work.
Above-mentioned light fixture protective circuit arranges temperature sensitive module 110 monitoring light fixtures; its output voltage changes with the variations in temperature of light fixture; temperature sensitive module 110 becomes greatly to voltage stabilizing didoe Z1 reverse-conducting with the magnitude of voltage of temperature rising output; so that trigger module 120 output triggering signals are with the switch of trigger switch module 130 control lamp powers; light fixture is quit work, realize the excess Temperature protection.
In the present embodiment, temperature sensitive module 110 becomes large with the magnitude of voltage of temperature rising output, and temperature sensitive module 110 is the temperature sensitive chip of an output voltage variation with temperature.In other embodiments, temperature sensitive module 110 also can be that temperature its output voltage that raises diminishes thereupon.In addition, temperature sensitive module 110 can also be the thermistor that comprises positive temperature coefficient, and the resistance of thermistor increases with the rising of temperature, thereby the voltage at thermistor two ends increases; Can also be the thermistor of negative temperature coefficient, the resistance of thermistor reduces with the rising of temperature, thus the lower voltage at thermistor two ends, and the output voltage of so temperature sensitive module 110 can be the voltage at these thermistor two ends.
As shown in Figure 2, be the schematic diagram of the light fixture protective circuit of an embodiment.
Further, trigger module 120 also comprises photoelectric coupling unit for promoting inhibition 122.The anode of voltage stabilizing didoe Z1 is connected with the input of the light emitting source of photoelectric coupling unit for promoting inhibition 122 by divider resistance R1, the output head grounding of the light emitting source of photoelectric coupling unit for promoting inhibition 122, the input of the light-receiving device of photoelectric coupling unit for promoting inhibition 122 is connected with DC power supply Vcc by divider resistance R3, and the output of the light-receiving device of photoelectric coupling unit for promoting inhibition 122 is connected with the control end of switch module 130.When the output voltage of temperature sensitive module 110 surpasses predetermined value, during the conducting voltage of voltage stabilizing didoe Z1, voltage stabilizing didoe Z1 conducting, photoelectric coupling unit for promoting inhibition 122 work, light emitting source is luminous, arriving the then light-receiving device conducting of conducting light intensity of light-receiving device, is output output trigger switch module 130 trigger voltages of work altogether of trigger module 120 at the output of light-receiving device.
If the impedance of voltage stabilizing didoe Z1 and photoelectric coupling unit for promoting inhibition 122 is in actual applications with the impedance matching of temperature sensitive module 110 then can omit divider resistance R1 and divider resistance R3.Divider resistance R1 and divider resistance R3 can replace with a plurality of resistance string are in parallel.
Photoelectric coupling unit for promoting inhibition 122 is photoelectrical coupler OPT1, is a kind of electrical-optical-power conversion device take light as the media transmission signal of telecommunication.Photoelectric coupling unit for promoting inhibition 122 comprises control section and switch sections, i.e. light emitting source and light-receiving device, and both are assembled in the same airtight housing, to each other with transparent insulator isolation.In other embodiments, photoelectric coupling unit for promoting inhibition 122 can be replaced with direct current relay.Wherein, the coil of direct current relay is equivalent to light emitting source as control section and plays control action, direct current relay switch contact be equivalent to light-receiving device and play on-off action.
The control end of switching tube Q2 is connected with the output of trigger module 120 as the control end of switch module 130, the input of switching tube Q2 is connected with DC power supply Vcc by resistance R 4, the output of switching tube Q2 passes through earth resistance R2 ground connection as the output of switch module 130, and the output of switch module 130 is the node E that the output of switching tube Q2 is connected with resistance R 2.The output of switch module 130 is connected with the on-off controller (not shown) of light fixture.After switching tube Q2 is switched on, can control with the switch of doing lamp power at its output output high level.In the present embodiment, switching tube Q2 is NPN type triode, and in other embodiments, all right field-effect transistors of switching tube Q2 or integrated circuit substitute.
In a preferred embodiment, switch module 130 also comprises switching tube Q1, resistance R 5, resistance R 6 and earth resistance R7.
The control end of switching tube Q1 is connected with the output of switching tube Q2, is connected with DC power supply Vcc by resistance R 5 by resistance R 4 simultaneously, the input of switching tube Q1 is connected with DC power supply Vcc by resistance R 6, and the output of switching tube Q1 is by earth resistance R7 ground connection.In the present embodiment, switching tube Q1 is the positive-negative-positive triode, and in other embodiments, all right field-effect transistors of switching tube Q1 or integrated circuit substitute.Be appreciated that in switching tube Q1 and the watt level of switching tube Q2 own and satisfy in the situation of voltage of the output voltage of trigger element 120 and DC power supply Vcc that resistance R 4, resistance R 5, resistance R 6 can be omitted.Resistance R 4, resistance R 5, resistance R 6 can also be replaced with several resistance string are in parallel.
A kind of light fixture protective device, comprise above-mentioned light fixture protective circuit, described light fixture protective circuit comprises the temperature sensitive module for monitoring lamp temperatures and exportable temperature variant voltage, trigger module and the switch module of the Voltage-output triggering signal of telecommunication of the corresponding output of temperature sensitive module when surpassing predetermined value with lamp temperatures, the input of described trigger module is connected with the voltage output end of described temperature sensitive module, the output of described trigger module is connected with the control end of described switch module, and the triggering signal of telecommunication of described trigger module output triggers described switch module and controls described light fixture and quit work;
Described temperature sensitive module becomes large with the magnitude of voltage of temperature rising output, described trigger module comprises voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the voltage output end of described temperature sensitive module, the anode of described voltage stabilizing didoe is electrically connected with the control end of described switch module, and the magnitude of voltage of described voltage stabilizing didoe reverse-conducting is less than the magnitude of voltage of the corresponding output of temperature sensitive module when lamp temperatures surpasses predetermined value.
The included light fixture protective circuit structure of light fixture protective device repeats no more as mentioned above here.
The below will further describe the operation principle of light fixture protective circuit.
When the lamp temperatures superelevation, the output voltage of temperature sensitive module 110 raises, the voltage stabilizing didoe Z1 of trigger module 120, successively conducting of photoelectric coupling unit for promoting inhibition 122.Thereafter; the base stage of switching tube Q2 obtains that conducting voltage is led so that the conducting of switching tube Q2; so relatively its then also conducting of emitter voltage reduction of the base voltage of switching tube Q1; DC power supply Vcc makes all the time conducting of switching tube Q2 through resistance R 6, switching tube Q1, resistance R 4; what switch module 130 on-off controller (not shown) output, light fixture received is high level all the time; light fixture is quit work; realized the excess Temperature protection of light fixture; only have the circuit of whole light fixture to restart, and light fixture just can be reworked behind the drop in temperature.
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 claim of the present invention.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 (10)
1. light fixture protective circuit, it is characterized in that, comprise that the temperature sensitive module for monitoring lamp temperatures and exportable temperature variant voltage, the Voltage-output of the corresponding output of temperature sensitive module when basis surpasses predetermined value with lamp temperatures trigger trigger module and the switch module of the signal of telecommunication, the input of described trigger module is connected with the voltage output end of described temperature sensitive module, the output of described trigger module is connected with the control end of described switch module, and the triggering signal of telecommunication of described trigger module output triggers described switch module and controls described light fixture and quit work;
Described temperature sensitive module becomes large with the magnitude of voltage of temperature rising output, described trigger module comprises voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the voltage output end of described temperature sensitive module, the anode of described voltage stabilizing didoe is electrically connected with the control end of described switch module, and the magnitude of voltage of described voltage stabilizing didoe reverse-conducting is less than the magnitude of voltage of the corresponding output of temperature sensitive module when lamp temperatures surpasses predetermined value.
2. light fixture protective circuit according to claim 1 is characterized in that, described trigger module also comprises photoelectric coupling unit for promoting inhibition, divider resistance R1 and divider resistance R3, wherein,
The anode of described voltage stabilizing didoe is connected with the input of the light emitting source of described photoelectric coupling unit for promoting inhibition by described divider resistance R1, the output head grounding of the light emitting source of described photoelectric coupling unit for promoting inhibition, the input of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with DC power supply by described divider resistance R3, and the output of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with the control end of described switch module.
3. light fixture protective circuit according to claim 1 and 2 is characterized in that, described switch module comprises switching tube Q2, earth resistance R2 and resistance R 4, wherein,
The control end of described switching tube Q2 is connected with DC power supply by described resistance R 4 as the input of the described switching tube Q2 of the control end of described switch module, and the output of described switching tube Q2 passes through described earth resistance R2 ground connection as the output of described switch module.
4. light fixture protective circuit according to claim 3 is characterized in that, described switch module also comprises switching tube Q1, resistance R 5, resistance R 6 and earth resistance R7, wherein,
The control end of described switching tube Q1 is connected, is connected with DC power supply by described resistance R 5 with the output of described switching tube Q2 by described resistance R 4 simultaneously, the input of described switching tube Q1 is connected with described DC power supply by described resistance R 6, and the output of described switching tube Q1 is by described earth resistance R7 ground connection.
5. light fixture protective circuit according to claim 4 is characterized in that, described switching tube Q1 is the positive-negative-positive triode, and described switching tube Q2 is NPN type triode.
6. light fixture protective device, it is characterized in that, comprise the light fixture protective circuit, described light fixture protective circuit comprises the temperature sensitive module for monitoring lamp temperatures and exportable temperature variant voltage, trigger module and the switch module of the Voltage-output triggering signal of telecommunication of the corresponding output of temperature sensitive module when surpassing predetermined value with lamp temperatures, the input of described trigger module is connected with the voltage output end of described temperature sensitive module, the output of described trigger module is connected with the control end of described switch module, and the triggering signal of telecommunication of described trigger module output triggers described switch module and controls described light fixture and quit work;
Described temperature sensitive module becomes large with the magnitude of voltage of temperature rising output, described trigger module comprises voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe is connected with the voltage output end of described temperature sensitive module, the anode of described voltage stabilizing didoe is electrically connected with the control end of described switch module, and the magnitude of voltage of described voltage stabilizing didoe reverse-conducting is less than the magnitude of voltage of the corresponding output of temperature sensitive module when lamp temperatures surpasses predetermined value.
7. light fixture protective device according to claim 6 is characterized in that, described trigger module also comprises photoelectric coupling unit for promoting inhibition, divider resistance R1 and divider resistance R3, wherein,
The anode of described voltage stabilizing didoe is connected with the input of the light emitting source of described photoelectric coupling unit for promoting inhibition by described divider resistance R1, the output head grounding of the light emitting source of described photoelectric coupling unit for promoting inhibition, the input of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with DC power supply by described divider resistance R3, and the output of the light-receiving device of described photoelectric coupling unit for promoting inhibition is connected with the control end of described switch module.
8. according to claim 6 or 7 described light fixture protective devices, it is characterized in that described switch module comprises switching tube Q2, earth resistance R2 and resistance R 4, wherein,
The control end of described switching tube Q2 is connected with DC power supply by described resistance R 4 as the input of the described switching tube Q2 of the control end of described switch module, and the output of described switching tube Q2 passes through described earth resistance R2 ground connection as the output of described switch module.
9. light fixture protective device according to claim 8 is characterized in that, described switch module also comprises switching tube Q1, resistance R 5, resistance R 6 and earth resistance R7, wherein,
The control end of described switching tube Q1 is connected, is connected with DC power supply by described resistance R 5 with the output of described switching tube Q2 by described resistance R 4 simultaneously, the input of described switching tube Q1 is connected with described DC power supply by described resistance R 6, and the output of described switching tube Q1 is by described earth resistance R7 ground connection.
10. light fixture protective device according to claim 9 is characterized in that, described switching tube Q1 is the positive-negative-positive triode, and described switching tube Q2 is NPN type triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210093477.XA CN103369758B (en) | 2012-03-31 | 2012-03-31 | Lamp protective circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210093477.XA CN103369758B (en) | 2012-03-31 | 2012-03-31 | Lamp protective circuit and device |
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| CN103369758A true CN103369758A (en) | 2013-10-23 |
| CN103369758B CN103369758B (en) | 2016-10-19 |
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| CN201210093477.XA Expired - Fee Related CN103369758B (en) | 2012-03-31 | 2012-03-31 | Lamp protective circuit and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020083393A1 (en) * | 2018-10-26 | 2020-04-30 | 中兴通讯股份有限公司 | Power supply over-temperature protection circuit, method and system |
| CN114326186A (en) * | 2021-12-22 | 2022-04-12 | 绵阳惠科光电科技有限公司 | Drive chip protection circuit, circuit board and display device |
| CN114743510A (en) * | 2022-04-02 | 2022-07-12 | 上海天马微电子有限公司 | Light-emitting panel and display device |
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