CN102593790B - Lighting fixture overheating protection circuit and lighting fixture thereof - Google Patents
Lighting fixture overheating protection circuit and lighting fixture thereof Download PDFInfo
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- CN102593790B CN102593790B CN201110000984.XA CN201110000984A CN102593790B CN 102593790 B CN102593790 B CN 102593790B CN 201110000984 A CN201110000984 A CN 201110000984A CN 102593790 B CN102593790 B CN 102593790B
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Abstract
The invention relates to a lighting fixture overheating protection circuit and a lighting fixture thereof. The lighting fixture overheating protection circuit, which is used to cut off a power supply circuit of the lighting fixture, comprises a linear voltage unit used to provide a stable voltage, a relay, a normally closed contact, a thermistor, a current-limiting resistor and a triggering triode, wherein the normally closed contact, the thermistor, the current-limiting resistor and the triggering triode are arranged in the power supply circuit. The relay is connected in series between an output terminal of the linear voltage unit and a collector electrode of the triggering triode and is used to break the normally closed contact. The thermistor is parallelly connected between a base electrode of the triggering triode and the collector electrode and is used to detect temperature change. When the temperature changes to a certain value and the triggering triode is conducted, the relay is started to break the normally closed contact. According to the above lighting fixture overheating protection circuit and the lighting fixture, the thermistor is used to detect surrounding temperature changes. When the temperature rises so as to conduct the triggering triode, the relay works and breaks the normally closed contact so that the power supply circuit of the lighting fixture is cut off. A purpose of overheating protection can be reached.
Description
[technical field]
The present invention relates to illuminations, particularly a kind of light fixture overheating protection circuit and light fixture.
[background technology]
Light fixture is often installed in various place, ambient temperature around may constantly change, and during light fixture work, easily produces a large amount of heats, ambient temperature is too high, light fixture cannot carry out heat exchange with external environment condition, causes internal temperature to continue to raise, at high temperature works for a long time, the useful life of easy shortening light fixture, in addition, temperature is too high, and lamp interior electronic device may be caused to damage.
[summary of the invention]
Based on this, be necessary to provide a kind of light fixture overheating protection circuit preventing lamp temperatures too high.
A kind of light fixture overheating protection circuit, for cutting off the power supply circuits of light fixture, comprise linear voltage unit, performance element and the trigger element of connecting successively, also comprise the detecting unit being connected in parallel on trigger element two ends, described linear voltage unit is for providing stable voltage, described detecting unit is used for detected temperatures change, and described trigger element performance element according to the change triggers of temperature performs open-circuit operation; Described performance element comprises relay and is arranged at the normally-closed contact in described power supply circuits, and described detecting unit comprises thermistor, and described trigger element comprises current-limiting resistance and trigger triode; Between the output that described relay is connected on described linear voltage unit and the collector electrode of described trigger triode, for disconnecting described normally-closed contact; Between the base stage that described thermistor is connected in parallel on described trigger triode and collector electrode, change for detected temperatures; Between the base stage that described current-limiting resistance is connected in parallel on described trigger triode and emitter, the emitter of described trigger triode is electrically connected with the earth terminal of described linear voltage unit and ground connection; When variations in temperature is to certain value, during trigger triode conducting, described relay starts, and is disconnected by normally-closed contact.
Preferably, described linear voltage unit comprises biasing resistor, NPN type triode and voltage-stabiliser tube, between the collector electrode that described biasing resistor is connected in parallel on described triode and base stage, between the base stage that described voltage-stabiliser tube is connected on described triode and the emitter of trigger triode.
Preferably, also comprise filter capacitor, described filter capacitor is connected in parallel on the output and ground of described linear voltage unit.
Preferably, also comprise anti-interference capacitor and the protective resistance of series connection mutually, described anti-interference capacitor is in parallel with described thermistor, and described anti-interference capacitor is used for filtering to the interference of described thermistor, and described protective resistance is in parallel with described current-limiting resistance.
Preferably, also comprise diode, described diode forward is biased the input being serially connected with described linear voltage unit.
In addition, there is a need to provide a kind of light fixture preventing temperature too high.
Described light fixture comprises lamp outer casing, also comprise the light fixture overheating protection circuit of the power supply circuits for cutting off light fixture, described light fixture overheating protection circuit comprises linear voltage unit, performance element and the trigger element of connecting successively, also comprise the detecting unit being connected in parallel on trigger element two ends, described linear voltage unit is for providing stable voltage, described detecting unit is used for detected temperatures change, and described trigger element performance element according to the change triggers of temperature performs open-circuit operation; Described performance element comprises relay and is arranged at the normally-closed contact in described power supply circuits, and described detecting unit comprises thermistor, and described trigger element comprises current-limiting resistance and trigger triode; Between the output that described relay is connected on described linear voltage unit and the collector electrode of described trigger triode, for disconnecting described normally-closed contact; Between the base stage that described thermistor is connected in parallel on described trigger triode and collector electrode, change for detected temperatures; Between the base stage that described current-limiting resistance is connected in parallel on described trigger triode and emitter, the emitter of described trigger triode is electrically connected with the earth terminal of described linear voltage unit and ground connection; When variations in temperature is to certain value, during trigger triode conducting, described relay starts, and is disconnected by normally-closed contact.
Preferably, described detecting unit is arranged at the outside of described lamp outer casing.
Above-mentioned light fixture overheating protection circuit and light fixture, adopt thermistor to detect environment temperature change, cause trigger triode conducting, relay work, disconnect normally-closed contact, thus cut off the power supply circuits of light fixture, reach the object of overtemperature protection when temperature raises.Therefore light fixture of the present invention can prevent too high the causing of lamp temperatures from damaging and various contingency, and its circuit structure is simple, and cost is low.
[accompanying drawing explanation]
Fig. 1 is the structural representation of light fixture overheating protection circuit in an embodiment.
[embodiment]
Below in conjunction with specific embodiment and accompanying drawing, technical scheme is described in detail.
As shown in Figure 1, a kind of light fixture overheating protection circuit, for cutting off the power supply circuits of light fixture, comprising linear voltage unit 100, performance element 200 and the trigger element 300 of connecting successively, being connected in parallel on the detecting unit 400 at trigger element 300 two ends.Wherein, linear unit 100 is for providing stable voltage, and detecting unit 400 is for detected temperatures change, and trigger element 300, according to the change of temperature, triggers performance element 200 and performs open-circuit operation.L1 is external electrical network live wire end, and L2 is the live wire end of light fixture power supply circuits.
In this embodiment, linear voltage unit 100 comprises biasing resistor R1, NPN type triode Q1 and voltage-stabiliser tube ZD1, and between the base stage that biasing resistor R1 is connected in parallel on triode Q1 and collector electrode, voltage-stabiliser tube ZD1 one end is electrically connected to the base stage of triode Q1, other end ground connection.Wherein, because of the pressure stabilization function of voltage-stabiliser tube ZD1, triode Q1 is in conducting state, and triode Q1 exports a constant current value.
Performance element 200 comprises relay and is arranged at the normally-closed contact K1 in the power supply circuits of light fixture.Relay is for disconnecting normally-closed contact K1, and normally-closed contact K1 is turned on or off the connection break-make that control between light fixture and power supply circuits.
Trigger element 300 comprises current-limiting resistance R3 and trigger triode Q2, between the base stage that current-limiting resistance R3 is connected in parallel on trigger triode Q2 and emitter.
Detecting unit 400 comprises thermistor RP4, changes for detected temperatures.The resistance value of thermistor RP4 is along with variations in temperature, and temperature is higher, and resistance value is less.
Above-mentioned light fixture overheating protection circuit also comprises filter capacitor C1, and filter capacitor C1 is used for filtering harmonic wave.
Above-mentioned light fixture overheating protection circuit also comprises anti-interference capacitor C2 and the protective resistance R2 of series connection, and anti-interference capacitor C2 is for preventing circuit to the interference of thermistor RP4.
Above-mentioned light fixture overheating protection circuit also comprises diode D1, and diode D1 is used for external communication electricity to be filtered into direct current.
The annexation of each device of above-mentioned lamp protective circuit is: diode D1 forward bias series is in the input of linear voltage unit 100; Between the collector electrode that biasing resistor R1 is connected in parallel on triode Q1 and base stage, the base stage of triode Q1 is by voltage-stabiliser tube ZD1 ground connection; Filter capacitor C1 is connected in parallel on the output and ground of linear voltage unit 100; Relay K 1 is connected between the emitter of triode Q1 and the collector electrode of trigger triode Q2; Between the base stage that thermistor RP4 is connected in parallel on trigger triode Q2 and collector electrode, between the base stage that current-limiting resistance R3 is connected in parallel on trigger triode Q2 and emitter, the emitter of trigger triode Q2 is electrically connected with the earth terminal of linear voltage unit 100 and ground connection; The anti-interference capacitor C2 of mutual series connection and protective resistance R2, anti-interference capacitor C2 is in parallel with thermistor RP4, and protective resistance R2 is in parallel with current-limiting resistance R3.
The operation principle of above-mentioned light fixture overheating protection circuit: light fixture has just started normal work, the linear voltage unit 100 that biasing resistor R1, voltage-stabiliser tube ZD1 and triode Q1 are formed, there is provided stable linear voltage to relay, normally-closed contact K1 is in closure state, thermistor RP4 resistance is in normal condition, voltage between the base stage of trigger triode Q2 and emitter is less, does not reach the conducting voltage of trigger triode Q2, and trigger triode Q2 is in cut-off state; Along with the rising of temperature, the resistance of thermistor RP4 diminishes, voltage between the base stage of trigger triode Q2 and emitter is raised, when voltage between the base stage and emitter of trigger triode Q2 is greater than threshold voltage, trigger triode Q2 conducting, ER effect is large, and trigger relay starts, normally-closed contact K1 disconnects, and the power supply circuits of light fixture are cut off.Upon a drop in temperature, thermistor RP4 resistance raises, when the voltage between the base stage of trigger triode Q2 and emitter is reduced under conducting voltage, trigger triode Q2 ends, when relay magnetic force is not enough, normally-closed contact K1 returns to closure state, and the power supply circuits of light fixture restore electricity.
In the present embodiment; also relate to a kind of light fixture; comprise lamp outer casing and light fixture overheating protection circuit; light fixture overheating protection circuit is for cutting off the power supply circuits of light fixture; this light fixture overheating protection circuit comprises linear voltage unit 100, performance element 200 and the trigger element 300 of connecting successively, is connected in parallel on the detecting unit 400 at trigger element 300 two ends.Wherein, linear unit 100 is for providing stable voltage, and detecting unit 400 is for detected temperatures change, and trigger element 300, according to the change of temperature, triggers performance element 200 and performs open-circuit operation.Detecting unit 400 comprises thermistor RP4, and thermistor RP4 is attached on the outer wall of lamp outer casing.
Above-mentioned light fixture overheating protection circuit and light fixture, adopt thermistor RP4 to detect environment temperature change, cause trigger triode Q2 conducting, relay work, disconnect normally-closed contact K1, thus cut off the power supply circuits of light fixture, reach the object of overtemperature protection when temperature raises.Therefore light fixture of the present invention can prevent too high the causing of lamp temperatures from damaging and various contingency, and its circuit structure is simple, and cost is low.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not 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 (2)
1. a light fixture overheating protection circuit, for cutting off the power supply circuits of light fixture, it is characterized in that: comprise linear voltage unit, performance element and the trigger element of connecting successively, also comprise the detecting unit being connected in parallel on trigger element two ends, described linear voltage unit is for providing stable voltage, described detecting unit is used for detected temperatures change, and described trigger element performance element according to the change triggers of temperature performs open-circuit operation; Described performance element comprises relay and is arranged at the normally-closed contact in described power supply circuits, and described detecting unit comprises thermistor, and described trigger element comprises current-limiting resistance and trigger triode; Between the output that described relay is connected on described linear voltage unit and the collector electrode of described trigger triode, for disconnecting described normally-closed contact; Between the base stage that described thermistor is connected in parallel on described trigger triode and collector electrode, change for detected temperatures; Between the base stage that described current-limiting resistance is connected in parallel on described trigger triode and emitter, the emitter of described trigger triode is electrically connected with the earth terminal of described linear voltage unit and ground connection; When variations in temperature is to certain value, the resistance of thermistor diminishes, when making the voltage between the base stage of trigger triode and emitter be greater than threshold voltage, during trigger triode conducting, ER effect is large, triggers described relay and starts, disconnected by normally-closed contact, the power supply circuits of light fixture are cut off; When temperature declines, thermistor resistance raises, and when the voltage between the base stage of trigger triode and emitter is reduced under conducting voltage, trigger triode ends, and when relay magnetic force is not enough, normally-closed contact returns to closure state;
Described light fixture overheating protection circuit also comprises anti-interference capacitor and the protective resistance of series connection mutually, described anti-interference capacitor is in parallel with described thermistor, described anti-interference capacitor is used for filtering to the interference of described thermistor, and described protective resistance is in parallel with described current-limiting resistance;
Described linear voltage unit comprises biasing resistor, NPN type triode and voltage-stabiliser tube, between the collector electrode that described biasing resistor is connected in parallel on described triode and base stage, between the base stage that described voltage-stabiliser tube is connected on described triode and the emitter of trigger triode;
Also comprise filter capacitor, described filter capacitor is connected in parallel on the output and ground of described linear voltage unit;
Also comprise diode, described diode forward is biased the input being serially connected with described linear voltage unit.
2. a light fixture, comprise lamp outer casing, it is characterized in that: the light fixture overheating protection circuit also comprising the power supply circuits for cutting off light fixture, described light fixture overheating protection circuit comprises linear voltage unit, performance element and the trigger element of connecting successively, also comprise the detecting unit being connected in parallel on trigger element two ends, described linear voltage unit is for providing stable voltage, described detecting unit is used for detected temperatures change, and described trigger element performance element according to the change triggers of temperature performs open-circuit operation; Described performance element comprises relay and is arranged at the normally-closed contact in described power supply circuits, and described detecting unit comprises thermistor, and described trigger element comprises current-limiting resistance and trigger triode; Between the output that described relay is connected on described linear voltage unit and the collector electrode of described trigger triode, for disconnecting described normally-closed contact; Between the base stage that described thermistor is connected in parallel on described trigger triode and collector electrode, change for detected temperatures; Between the base stage that described current-limiting resistance is connected in parallel on described trigger triode and emitter, the emitter of described trigger triode is electrically connected with the earth terminal of described linear voltage unit and ground connection; When variations in temperature is to certain value, the resistance of thermistor diminishes, and makes the voltage between the base stage of trigger triode and emitter be greater than threshold voltage, during trigger triode conducting, ER effect is large, triggers described relay and starts, disconnected by normally-closed contact, the power supply circuits of light fixture are cut off; When temperature declines, thermistor resistance raises, and when the voltage between the base stage of trigger triode and emitter is reduced under conducting voltage, trigger triode ends, and when relay magnetic force is not enough, normally-closed contact returns to closure state;
Described light fixture overheating protection circuit also comprises anti-interference capacitor and the protective resistance of series connection mutually, described anti-interference capacitor is in parallel with described thermistor, described anti-interference capacitor is used for filtering to the interference of described thermistor, and described protective resistance is in parallel with described current-limiting resistance;
Described linear voltage unit comprises biasing resistor, NPN type triode and voltage-stabiliser tube, between the collector electrode that described biasing resistor is connected in parallel on described triode and base stage, between the base stage that described voltage-stabiliser tube is connected on described triode and the emitter of trigger triode;
Also comprise filter capacitor, described filter capacitor is connected in parallel on the output and ground of described linear voltage unit;
Also comprise diode, described diode forward is biased the input being serially connected with described linear voltage unit;
Described detecting unit is arranged at the outside of described lamp outer casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110000984.XA CN102593790B (en) | 2011-01-05 | 2011-01-05 | Lighting fixture overheating protection circuit and lighting fixture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110000984.XA CN102593790B (en) | 2011-01-05 | 2011-01-05 | Lighting fixture overheating protection circuit and lighting fixture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102593790A CN102593790A (en) | 2012-07-18 |
| CN102593790B true CN102593790B (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110000984.XA Expired - Fee Related CN102593790B (en) | 2011-01-05 | 2011-01-05 | Lighting fixture overheating protection circuit and lighting fixture thereof |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634998B (en) * | 2012-08-22 | 2018-08-07 | 深圳市海洋王照明工程有限公司 | A kind of lamp circuit |
| CN103813564A (en) * | 2012-11-05 | 2014-05-21 | 海洋王（东莞）照明科技有限公司 | Lamp and protection circuit thereof |
| CN104167928B (en) * | 2013-05-15 | 2017-05-03 | 海洋王（东莞）照明科技有限公司 | Power supply circuit and power supply apparatus |
| CN104427731B (en) * | 2013-09-02 | 2018-07-06 | 深圳市海洋王照明工程有限公司 | Gas discharge light fixture and its trigger |
| CN106997220B (en) * | 2017-03-29 | 2019-02-26 | 歌尔股份有限公司 | Delayed power circuit |
| CN109428317B (en) * | 2017-09-04 | 2022-05-24 | 重庆海尔洗衣机有限公司 | Overheat protection system and method for clothes dryer |
| CN111542151B (en) * | 2020-06-17 | 2022-04-19 | 东莞职业技术学院 | Lamp control circuit and lamp thereof |
| CN114447882A (en) * | 2022-02-18 | 2022-05-06 | 金国彬 | Circuit local overheating protection trigger circuit and trigger method |
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| CN2132321Y (en) * | 1992-08-15 | 1993-05-05 | 刘凤玉 | Overtemperature protector for motor |
| CN2149704Y (en) * | 1993-01-21 | 1993-12-15 | 张贵华 | Protector for transformer |
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Also Published As
| Publication number | Publication date |
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| CN102593790A (en) | 2012-07-18 |
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Granted publication date: 20150107 Termination date: 20190105 |