CN102593790A - 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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- CN102593790A CN102593790A CN201110000984XA CN201110000984A CN102593790A CN 102593790 A CN102593790 A CN 102593790A CN 201110000984X A CN201110000984X A CN 201110000984XA CN 201110000984 A CN201110000984 A CN 201110000984A CN 102593790 A CN102593790 A CN 102593790A
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- protection circuit
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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 often is installed in the various places, and ambient temperature on every side possibly constantly change, during light fixture work; Be prone to produce great amount of heat, ambient temperature is too high, and light fixture can't carry out heat exchange with external environment condition; Cause internal temperature to continue to raise, at high temperature work for a long time, be prone to shorten the useful life of light fixture; In addition, temperature is too high, may cause the lamp interior electronic device to damage.
[summary of the invention]
Based on this, be necessary to provide a kind of light fixture overheating protection circuit that prevents that lamp temperatures is too high.
A kind of light fixture overheating protection circuit; Be used to cut off the power supply circuits of light fixture; Comprise successively linear voltage unit, performance element and the trigger element of series connection, also comprise the detecting unit that is connected in parallel on the trigger element two ends, said linear voltage unit is used to the voltage that provides stable; Said detecting unit is used for detected temperatures to be changed, and said trigger element triggers said performance element according to variation of temperature and carries out open-circuit operation; Said performance element comprise relay be arranged at the normally-closed contact in the said power supply circuits, said detecting unit comprises thermistor, said trigger element comprises current-limiting resistance and trigger triode; Said relay is connected between the collector electrode of output and said trigger triode of said linear voltage unit, is used to break off said normally-closed contact; Said thermistor is connected in parallel between the base stage and collector electrode of said trigger triode, is used for detected temperatures and changes; Said current-limiting resistance is connected in parallel between the base stage and emitter of said trigger triode, and the emitter of said trigger triode is electrically connected with the earth terminal of said linear voltage unit and ground connection; When variations in temperature arrived certain value, during the trigger triode conducting, said relay started, and normally-closed contact is broken off.
Preferably; Said linear voltage unit comprises biasing resistor, NPN type triode and voltage-stabiliser tube; Said biasing resistor is connected in parallel between the collector electrode and base stage of said triode, and said voltage-stabiliser tube is connected between the emitter of base stage and trigger triode of said triode.
Preferably, also comprise filter capacitor, said filter capacitor is connected in parallel on the output and ground of said linear voltage unit.
Preferably, also comprise the anti-interference capacitor and the protective resistance of mutual series connection, said anti-interference capacitor is parallelly connected with said thermistor, and said anti-interference capacitor is used for the interference of filtering to said thermistor, and said protective resistance is parallelly connected with said current-limiting resistance.
Preferably, also comprise diode, said diode forward biasing is serially connected with the input of said linear voltage unit.
In addition, also be necessary to provide a kind of light fixture that prevents that temperature is too high.
Said light fixture comprises lamp outer casing; The light fixture overheating protection circuit that also comprises the power supply circuits that are used to cut off light fixture; Said light fixture overheating protection circuit comprises successively linear voltage unit, performance element and the trigger element of series connection, also comprises the detecting unit that is connected in parallel on the trigger element two ends, and said linear voltage unit is used to the voltage that provides stable; Said detecting unit is used for detected temperatures to be changed, and said trigger element triggers said performance element according to variation of temperature and carries out open-circuit operation; Said performance element comprise relay be arranged at the normally-closed contact in the said power supply circuits, said detecting unit comprises thermistor, said trigger element comprises current-limiting resistance and trigger triode; Said relay is connected between the collector electrode of output and said trigger triode of said linear voltage unit, is used to break off said normally-closed contact; Said thermistor is connected in parallel between the base stage and collector electrode of said trigger triode, is used for detected temperatures and changes; Said current-limiting resistance is connected in parallel between the base stage and emitter of said trigger triode, and the emitter of said trigger triode is electrically connected with the earth terminal of said linear voltage unit and ground connection; When variations in temperature arrived certain value, during the trigger triode conducting, said relay started, and normally-closed contact is broken off.
Preferably, said detecting unit is arranged at the outside of said lamp outer casing.
Above-mentioned light fixture overheating protection circuit and light fixture adopt thermistor to detect environment temperature and change, and cause the trigger triode conducting when temperature raises, and normally-closed contact is broken off in relay work, thereby cuts off the power supply circuits of light fixture, reaches the purpose of overtemperature protection.So light fixture of the present invention can prevent that too high the causing of lamp temperatures from damaging and various contingency, and its circuit structure is simple, cost is low.
[description of drawings]
Fig. 1 is the structural representation of light fixture overheating protection circuit among the embodiment.
[embodiment]
Below in conjunction with concrete embodiment and accompanying drawing technical scheme is carried out detailed description.
As shown in Figure 1, a kind of light fixture overheating protection circuit is used to cut off the power supply circuits of light fixture, comprises linear voltage unit 100, performance element 200 and the trigger element 300 of series connection successively, is connected in parallel on the detecting unit 400 at trigger element 300 two ends.Wherein, linear unit 100 is used to the voltage that provides stable, and detecting unit 400 is used for detected temperatures to be changed, and trigger element 300 triggers performance element 200 and carries out open-circuit operations according to variation of temperature.L1 is an external electrical network live wire end, and L2 is the live wire end of light fixture power supply circuits.
Among this embodiment, linear voltage unit 100 comprises biasing resistor R1, NPN type triode Q1 and voltage-stabiliser tube ZD1, and biasing resistor R1 is connected in parallel between the base stage and collector electrode of triode Q1, and 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.
Detecting unit 400 comprises thermistor RP4, is used for detected temperatures and changes.The resistance value of thermistor RP4 is along with variations in temperature, and temperature is high more, and resistance value is more little.
Above-mentioned light fixture overheating protection circuit also comprises filter capacitor C1, and filter capacitor C1 is used for filtering harmonic.
Above-mentioned light fixture overheating protection circuit also comprises the anti-interference capacitor C2 and the protective resistance R2 of series connection, and anti-interference capacitor C2 is used to prevent the interference of circuit to thermistor RP4.
Above-mentioned light fixture overheating protection circuit also comprises diode D1, and diode D1 is used for the external communication electricity is filtered into direct current.
The annexation of each device of above-mentioned light fixture protective circuit is: diode D1 forward bias is series at the input of linear voltage unit 100; Biasing resistor R1 is connected in parallel between the collector electrode and base stage of triode Q1, and the base stage of triode Q1 is through 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 collector electrode of emitter and trigger triode Q2 of triode Q1; Thermistor RP4 is connected in parallel between the base stage and collector electrode of trigger triode Q2, and current-limiting resistance R3 is connected in parallel between the base stage and emitter of trigger triode Q2, and 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 and the protective resistance R2 that connect each other, anti-interference capacitor C2 is parallelly connected with thermistor RP4, and protective resistance R2 is parallelly connected with current-limiting resistance R3.
The operation principle of above-mentioned light fixture overheating protection circuit: light fixture has just begun operate as normal; The linear voltage unit 100 that biasing resistor R1, voltage-stabiliser tube ZD1 and triode Q1 constitute provides stable linear voltage to relay, and normally-closed contact K1 is in closure state; Thermistor RP4 resistance is in normal condition; Base stage and the voltage between the emitter of trigger triode Q2 are less, do 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, and makes the base stage of trigger triode Q2 and the voltage between the emitter raise; When the base stage of trigger triode Q2 and the voltage between the emitter during greater than threshold voltage; Trigger triode Q2 conducting, electrorheological is big, and trigger relay starts; Normally-closed contact K1 breaks off, and the power supply circuits of light fixture are cut off.When temperature descended, thermistor RP4 resistance raise, and the base stage of trigger triode Q2 and the voltage between the emitter are reduced to conducting voltage following time; Trigger triode Q2 ends; When relay magnetic force was not enough, normally-closed contact K1 returned 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; The light fixture overheating protection circuit is used to cut off the power supply circuits of light fixture, and this light fixture overheating protection circuit comprises linear voltage unit 100, performance element 200 and the trigger element 300 of series connection successively, is connected in parallel on the detecting unit 400 at trigger element 300 two ends.Wherein, linear unit 100 is used to the voltage that provides stable, and detecting unit 400 is used for detected temperatures to be changed, and trigger element 300 triggers performance element 200 and carries out open-circuit operations according to variation of temperature.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 and change, and cause trigger triode Q2 conducting when temperature raises, and normally-closed contact K1 is broken off in relay work, thereby cuts off the power supply circuits of light fixture, reaches the purpose of overtemperature protection.So light fixture of the present invention can prevent that too high the causing of lamp temperatures from damaging and various contingency, and its circuit structure is simple, cost is low.
The above embodiment has only expressed several kinds of execution modes 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 under the prerequisite that does not break away from the present invention's design, 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 accompanying claims.
Claims (8)
1. light fixture overheating protection circuit; Be used to cut off the power supply circuits of light fixture; It is characterized in that: comprise successively linear voltage unit, performance element and the trigger element of series connection, also comprise the detecting unit that is connected in parallel on the trigger element two ends, said linear voltage unit is used to the voltage that provides stable; Said detecting unit is used for detected temperatures to be changed, and said trigger element triggers said performance element according to variation of temperature and carries out open-circuit operation; Said performance element comprise relay be arranged at the normally-closed contact in the said power supply circuits, said detecting unit comprises thermistor, said trigger element comprises current-limiting resistance and trigger triode; Said relay is connected between the collector electrode of output and said trigger triode of said linear voltage unit, is used to break off said normally-closed contact; Said thermistor is connected in parallel between the base stage and collector electrode of said trigger triode, is used for detected temperatures and changes; Said current-limiting resistance is connected in parallel between the base stage and emitter of said trigger triode, and the emitter of said trigger triode is electrically connected with the earth terminal of said linear voltage unit and ground connection; When variations in temperature arrived certain value, during the trigger triode conducting, said relay started, and normally-closed contact is broken off.
2. light fixture overheating protection circuit according to claim 1; It is characterized in that: said linear voltage unit comprises biasing resistor, NPN type triode and voltage-stabiliser tube; Said biasing resistor is connected in parallel between the collector electrode and base stage of said triode, and said voltage-stabiliser tube is connected between the emitter of base stage and trigger triode of said triode.
3. light fixture overheating protection circuit according to claim 1 is characterized in that: also comprise filter capacitor, said filter capacitor is connected in parallel on the output and ground of said linear voltage unit.
4. light fixture overheating protection circuit according to claim 1; It is characterized in that: the anti-interference capacitor and the protective resistance that also comprise mutual series connection; Said anti-interference capacitor is parallelly connected with said thermistor; Said anti-interference capacitor is used for the interference of filtering to said thermistor, and said protective resistance is parallelly connected with said current-limiting resistance.
5. light fixture overheating protection circuit according to claim 1 is characterized in that: also comprise diode, said diode forward biasing is serially connected with the input of said linear voltage unit.
6. light fixture; Comprise lamp outer casing; It is characterized in that: the light fixture overheating protection circuit that also comprises the power supply circuits that are used to cut off light fixture; Said light fixture overheating protection circuit comprises successively linear voltage unit, performance element and the trigger element of series connection, also comprises the detecting unit that is connected in parallel on the trigger element two ends, and said linear voltage unit is used to the voltage that provides stable; Said detecting unit is used for detected temperatures to be changed, and said trigger element triggers said performance element according to variation of temperature and carries out open-circuit operation; Said performance element comprise relay be arranged at the normally-closed contact in the said power supply circuits, said detecting unit comprises thermistor, said trigger element comprises current-limiting resistance and trigger triode; Said relay is connected between the collector electrode of output and said trigger triode of said linear voltage unit, is used to break off said normally-closed contact; Said thermistor is connected in parallel between the base stage and collector electrode of said trigger triode, is used for detected temperatures and changes; Said current-limiting resistance is connected in parallel between the base stage and emitter of said trigger triode, and the emitter of said trigger triode is electrically connected with the earth terminal of said linear voltage unit and ground connection; When variations in temperature arrived certain value, during the trigger triode conducting, said relay started, and normally-closed contact is broken off.
7. light fixture overheating protection circuit according to claim 6 is characterized in that: said light fixture overheating protection circuit is the light fixture overheating protection circuit of claim 2～5 described in each.
8. light fixture overheating protection circuit according to claim 6 is characterized in that: said detecting unit is arranged at the outside of said 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 true CN102593790A (en) | 2012-07-18 |
| CN102593790B CN102593790B (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634998A (en) * | 2012-08-22 | 2014-03-12 | 深圳市海洋王照明工程有限公司 | 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 |
| CN104167928A (en) * | 2013-05-15 | 2014-11-26 | 海洋王（东莞）照明科技有限公司 | Power supply circuit and power supply apparatus |
| CN104427731A (en) * | 2013-09-02 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Gas discharging lamp and trigger thereof |
| CN106997220A (en) * | 2017-03-29 | 2017-08-01 | 歌尔股份有限公司 | Delayed power circuit |
| CN109428317A (en) * | 2017-09-04 | 2019-03-05 | 青岛海尔洗衣机有限公司 | A kind of dryer overheat protecting system and method |
| CN111542151A (en) * | 2020-06-17 | 2020-08-14 | 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN2563804Y (en) * | 2001-06-06 | 2003-07-30 | 张若煜 | Overheat protector for electric appliance |
| CN200976576Y (en) * | 2006-12-07 | 2007-11-14 | 林华木 | Plane solid state relay for short circuit and overload protection |
| CN201430579Y (en) * | 2009-06-22 | 2010-03-24 | 北京北广科技股份有限公司 | Logic switch control circuit with functions of overheating and overvoltage protection for GaAs FET |
| CN201571237U (en) * | 2009-12-28 | 2010-09-01 | 重庆三弓科技发展有限公司 | LED overheating protection circuit |
| CN201654583U (en) * | 2010-04-07 | 2010-11-24 | 四川电力试验研究院 | Automatic temperature control and safety protection device |
-
2011
- 2011-01-05 CN CN201110000984.XA patent/CN102593790B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN2563804Y (en) * | 2001-06-06 | 2003-07-30 | 张若煜 | Overheat protector for electric appliance |
| CN200976576Y (en) * | 2006-12-07 | 2007-11-14 | 林华木 | Plane solid state relay for short circuit and overload protection |
| CN201430579Y (en) * | 2009-06-22 | 2010-03-24 | 北京北广科技股份有限公司 | Logic switch control circuit with functions of overheating and overvoltage protection for GaAs FET |
| CN201571237U (en) * | 2009-12-28 | 2010-09-01 | 重庆三弓科技发展有限公司 | LED overheating protection circuit |
| CN201654583U (en) * | 2010-04-07 | 2010-11-24 | 四川电力试验研究院 | Automatic temperature control and safety protection device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634998A (en) * | 2012-08-22 | 2014-03-12 | 深圳市海洋王照明工程有限公司 | Lamp circuit |
| 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 |
| CN104167928A (en) * | 2013-05-15 | 2014-11-26 | 海洋王（东莞）照明科技有限公司 | Power supply circuit and power supply apparatus |
| 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 |
| CN104427731A (en) * | 2013-09-02 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Gas discharging lamp and trigger thereof |
| 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 |
| CN106997220A (en) * | 2017-03-29 | 2017-08-01 | 歌尔股份有限公司 | Delayed power circuit |
| CN109428317A (en) * | 2017-09-04 | 2019-03-05 | 青岛海尔洗衣机有限公司 | A kind of dryer overheat protecting system and method |
| 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 |
| CN111542151A (en) * | 2020-06-17 | 2020-08-14 | 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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| CN102593790B (en) | 2015-01-07 |
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Granted publication date: 20150107 Termination date: 20190105 |