CN104219816A - Lamp overheating protection circuit and lamp - Google Patents
Lamp overheating protection circuit and lamp Download PDFInfo
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- CN104219816A CN104219816A CN201310209772.1A CN201310209772A CN104219816A CN 104219816 A CN104219816 A CN 104219816A CN 201310209772 A CN201310209772 A CN 201310209772A CN 104219816 A CN104219816 A CN 104219816A
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Abstract
This invention provides a lamp overheating protection circuit. The lamp overheating protection circuit includes: a detecting unit that is used for detecting the temperature of a lamp; a control unit that connects with detecting unit; a switch unit that controlled by the control unit and that contains an input end, a first output end and a second output end, wherein the input end of switch unit connects with the power source and the second output end of the switch unit connects with the lamp; and a fan that is used for reducing the temperature of the lamp and that is connected with the first output end of the switch unit; wherein, when the detecting unit detects that the lamp temperature is higher than the protection value, the control unit controls the input end and the first output end of switch unit to connect with each other,the fan starts working to reduce temperature of the lamp and the lamp works with low power. This invention also provides a lamp. This invention can protect the lamp from being easily damaged under high temperature for a long time and prolong the service life of the lamp.
Description
Technical field
The present invention relates to a kind of protective circuit, relate in particular to a kind of light fixture overheating protection circuit and light fixture.
Background technology
In prior art, if light fixture works long hours, temperature will rise very highly, and at high temperature, light fixture works long hours and can damage light fixture, reduces the life-span of light fixture.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of light fixture overheating protection circuit and light fixture, thereby can solve light fixture, works long hours and can excess Temperature damages the problem of light fixture.
For solving the problems of the technologies described above, the present invention proposes a kind of light fixture overheating protection circuit, it is connected between power supply and light fixture, it comprises: detecting unit, it is for detection of the temperature of light fixture, it comprises input, the first output and the second output, and the input of detecting unit connects the positive pole of power supply, and the second output of detecting unit connects the negative pole of power supply; Control unit, it comprises first input end, the second input and output, the first input end of control unit connects the input of detecting unit, and the second input of control unit connects the first output of detecting unit, and the output of control unit connects the second output of detecting unit; Switch element, it is controlled by control unit, and it comprises input, the first output and the second output, and the input of switch element connects power supply, and the second output of switch element connects light fixture; And fan, it is used to light fixture cooling, the first output of its connecting valve unit; Wherein, when the temperature that light fixture detected when detecting unit is worth higher than protection; the input of control unit control switch unit and the first output conducting; fan work is light fixture cooling; light fixture is with lower power work, when the temperature that light fixture detected when detecting unit is worth lower than protection, and the input of control unit control switch unit and the second output conducting; fan quits work, and light fixture is normally worked.
Preferably, detecting unit comprises the first resistance, the first electric capacity, the first triode, temperature-sensitive switch and the second resistance, one end of the first resistance connects the input of detecting unit, the other end of the first resistance connects the first output of detecting unit, one end of the first electric capacity connects the other end of the first resistance, the other end of the first electric capacity connects the second output of detecting unit, the collector electrode of triode connects the first output of detecting unit, the emitter of triode connects the second output of detecting unit, one end of temperature-sensitive switch connects the input of detecting unit, the other end of temperature-sensitive switch connects the second resistance to the second output of detecting unit, the base stage of the other end connecting triode of temperature-sensitive switch.
Preferably, the resistance of the first resistance R 1 arranges according to supply voltage.
Preferably, control unit comprises integrated circuit, the hot-wire coil of relay and the first diode, integrated circuit comprises first input end, the second input, the 3rd input, the first output and the second output, the first input end of the first input end of integrated circuit and the equal connection control unit of the second input, the 3rd input of integrated circuit connects the second input of detecting unit, the output of the first output connection control unit of integrated circuit, the second output of integrated circuit connects one end of the hot-wire coil of relay, the negative electrode of the first diode connects the second output of integrated circuit, the output of the equal connection control unit of anode of the other end of the hot-wire coil of relay and the first diode.
Preferably; switch element comprises commutator and protective resistance; commutator comprises input, the first output and the second output; the input of the input connecting valve unit of commutator; the first output of the first output connecting valve unit of commutator; the second output of the second output connecting valve unit of commutator, protective resistance is connected between first output and the second output of switch element.
Preferably; light fixture overheating protection circuit also comprises capacitance decompression unit; capacitance decompression unit comprises the second diode, the second electric capacity, the 3rd electric capacity, voltage-stabiliser tube and the 3rd resistance; the second electric capacity and the second diode are connected between the first input end of power supply and control unit; the 3rd resistance and the second Capacitance parallel connection; the negative electrode of voltage-stabiliser tube connects the anode of the second diode; the output of the anodic bonding control unit of voltage-stabiliser tube, the 3rd electric capacity is connected between the first input end and output of control end.
Preferably, protective resistance is thermistor.
Preferably, the model of integrated circuit is NE555.
Preferably, light fixture overheating protection circuit also comprises fuse, and fuse is connected between power supply and control unit.
The present invention also proposes a kind of light fixture, comprises light fixture overheating protection circuit as above.
Compared with prior art; light fixture overheating protection circuit of the present invention and light fixture; temperature by light fixture being detected is controlled fan work during higher than protection value, is its cooling, can protect light fixture working the life-span not fragile, that extended light fixture under long-time high temperature.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of light fixture overheating protection circuit of the present invention.
Description of reference numerals is as follows: hot-wire coil K first diode D1 switch element 3 commutator K1 thermistor RT1 capacitance decompression unit 4 second diode D2 the second capacitor C 2 the 3rd capacitor C 3 voltage-stabiliser tube ZD1 the 3rd resistance R 3 fuse FS fan M1 light fixture LAMP of detecting unit 1 first resistance R 1 first capacitor C 1 first triode Q1 temperature-sensitive switch S1 the second resistance R 2 control unit 2 integrated circuit U1 relays.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
Refer to Fig. 1, light fixture overheating protection circuit of the present invention, it is connected between power supply and light fixture LAMP, and it comprises: detecting unit 1, control unit 2, switch element 3, capacitance decompression unit 4 and fan M1.
Detecting unit 1 is for detection of the temperature of light fixture LAMP, and switch element 3 is controlled by control unit 2, and fan M1 is used to light fixture LAMP cooling.Detecting unit 1 comprises input, the first output and the second output, and the input of detecting unit 1 connects the positive pole of power supply, and the second output of detecting unit 1 connects the negative pole of power supply.Control unit 2 comprises first input end, the second input and output, the first input end of control unit 2 connects the input of detecting unit 1, the second input of control unit 2 connects the first output of detecting unit 1, and the output of control unit 2 connects the second output of detecting unit 1.Switch element 3 comprises input, the first output and the second output, and the input of switch element 3 connects power supply, and the second output of switch element 3 connects light fixture LAMP.The first output of its connecting valve unit 3 of fan M1.Wherein, when the temperature that light fixture LAMP detected when detecting unit 1 is worth higher than protection; the input of control unit 2 control switch unit 3 and the first output conducting; fan M1 work is light fixture LAMP cooling; light fixture LAMP is with lower power work, when the temperature that light fixture LAMP detected when detecting unit 1 is worth lower than protection, and the input of control unit 2 control switch unit 3 and its second output conducting; fan M1 quits work, and light fixture LAMP normally works.
Detecting unit 1 comprises the first resistance R 1, the first capacitor C 1, the first triode Q1, temperature-sensitive switch S1 and the second resistance R 2.One end of the first resistance R 1 connects the input of detecting unit 1, the other end of the first resistance R 1 connects the first output of detecting unit 1, one end of the first capacitor C 1 connects the other end of the first resistance R 1, the other end of the first capacitor C 1 connects the second output of detecting unit 1, the collector electrode of triode connects the first output of detecting unit 1, the emitter of triode connects the second output of detecting unit 1, one end of temperature-sensitive switch S1 connects the input of detecting unit 1, the other end of temperature-sensitive switch S1 connects the second resistance R 2 to the second output of detecting unit 1, the base stage of the other end connecting triode of temperature-sensitive switch S1.In the present embodiment, the resistance of the first resistance R 1 arranges according to supply voltage, and when the first triode Q1 conducting, the dividing potential drop at its two ends is greater than 2/3rds of supply voltage.
Control unit 2 comprises hot-wire coil K and the first diode D1 of integrated circuit U1, relay.Integrated circuit U1 comprises first input end, the second input, the 3rd input, the first output and the second output.The first input end of the first input end of integrated circuit U1 and the equal connection control unit 2 of the second input, the 3rd input of integrated circuit U1 connects the second input of detecting unit 1, the output of the first output connection control unit 2 of integrated circuit U1, the second output of integrated circuit U1 connects one end of the hot-wire coil K of relay, the negative electrode of the first diode D1 connects the second output of integrated circuit U1, the output of the equal connection control unit 2 of anode of the other end of the hot-wire coil K of relay and the first diode D1.
In the present embodiment, the model of integrated circuit U1 is NE555.Therefore, the reset terminal of chip NE555 is the first input end of integrated circuit U1, the power end of chip NE555 is the second input of integrated circuit U1, the trigger end of chip NE555 is the 3rd input of integrated circuit U1, the earth terminal of chip NE555 is the first output of integrated circuit U1, and the output of chip NE555 is the second output of integrated circuit U1.According to the characteristic of chip NE555, the voltage that the 3rd input of integrated circuit U1 receives detecting unit 1 first output output is lower than three of supply voltage/for the moment, the second output output high level of integrated circuit U1, that is, the voltage that the trigger end of chip NE555 receives is lower than three of supply voltage/for the moment, the output output high level of chip NE555, the hot-wire coil K energising of relay.
Switch element 3 comprises commutator K1 and protective resistance.In the present embodiment, protective resistance is thermistor RT1.Commutator K1 comprises input, the first output and the second output, the input of the input connecting valve unit 3 of commutator K1, the first output of the first output connecting valve unit 3 of commutator K1, the second output of the second output connecting valve unit 3 of commutator K1, thermistor RT1 is connected between first output and the second output of switch element 3.In other embodiments, also can adopt the resistance of larger resistance, while making light fixture LAMP overheated, light fixture LAMP can only work under less power.
Capacitance decompression unit 4 comprises the second diode D2, the second capacitor C 2, the 3rd capacitor C 3, voltage-stabiliser tube ZD1 and the 3rd resistance R 3.The second capacitor C 2 and the second diode D2 are connected between the first input end of power supply and control unit 2, the 3rd resistance R 3 is in parallel with the second capacitor C 2, the negative electrode of voltage-stabiliser tube ZD1 connects the anode of the second diode D2, the output of the anodic bonding control unit 2 of voltage-stabiliser tube ZD1, the 3rd capacitor C 3 is connected between the first input end and output of control end.In the present embodiment, capacitance decompression unit 4 is converted to alternating voltage the direct voltage of 11V.
Light fixture overheating protection circuit also comprises fuse FS.Fuse FS is connected between power supply and control unit 2, can be when voltage be excessive, and the element of protective circuit.
The present invention also proposes a kind of light fixture, comprises above-mentioned light fixture overheating protection circuit.
Below in conjunction with Fig. 1, describe operation principle of the present invention in detail.
When temperature is normal, capacitance decompression unit 4 output 11V direct voltages are chip NE555 power supply, by the first resistance R 1, give the first capacitor C 1 charging, and now thermistor RT is equivalent to open circuit, and the second resistance R 2 both end voltage are very low, and the first triode Q1 disconnects.The trigger end of chip NE555 is in high potential, output no-output, and hot-wire coil K does not have electric current to flow through, relay is not worked, and alternating current is that motor is powered by the path of the commutator K1 of relay, and thermistor RT1 is by short circuit, do not work, light fixture LAMP normally works.
After the light fixture LAMP operating time is very long; when temperature rises to higher than protection value; temperature-sensitive switch S1 conducting, makes the first triode Q1 conducting, and the voltage of the trigger end of chip NE555 is pulled down to while being less than supply voltage 1/3; the output of chip NE555 starts to export high level; hot-wire coil K current flowing, makes relay obtain electric work, and commutator K1 and fan M1 connect; fan M1 obtains electric work, is light fixture LAMP heat radiation.Light fixture LAMP is by thermistor RT1 current limliting simultaneously, and brightness reduces, but can not extinguish, and can continue to provide illumination for people.Until fan M1 is light fixture LAMP, drop to below protection value, temperature-sensitive switch S1 disconnects, so periodic duty.
Compared with prior art; light fixture overheating protection circuit of the present invention and light fixture; temperature by light fixture being detected is controlled fan work during higher than protection value; for its cooling; can protect light fixture to work the life-span not fragile, that extended light fixture under long-time high temperature, and circuit elements device is less, structure is more simple.
The foregoing is only better possible embodiments of the present invention, not limit the scope of the invention.The equivalent structure that all utilizations specification of the present invention and accompanying drawing content have been done changes, and is all included in protection scope of the present invention.
Claims (10)
1. a light fixture overheating protection circuit, it is connected between power supply and light fixture, it is characterized in that, and it comprises:
Detecting unit, it is for detection of the temperature of described light fixture, and it comprises input, the first output and the second output, and the input of described detecting unit connects the positive pole of described power supply, and the second output of described detecting unit connects the negative pole of described power supply;
Control unit, it comprises first input end, the second input and output, the first input end of described control unit connects the input of described detecting unit, the second input of described control unit connects the first output of described detecting unit, and the output of described control unit connects the second output of described detecting unit;
Switch element, it is controlled by described control unit, and it comprises input, the first output and the second output, and the input of described switch element connects described power supply, and the second output of described switch element connects described light fixture; And
Fan, it is used to described light fixture cooling, and it connects the first output of described switch element;
Wherein, when the temperature that described light fixture detected when described detecting unit is worth higher than protection; described control unit is controlled input and the first output conducting of described switch element; described fan work is described light fixture cooling; described light fixture is with lower power work, and the temperature that described light fixture detected when described detecting unit is during lower than described protection value, and described control unit is controlled input and the second output conducting of described switch element; described fan quits work, and described light fixture is normally worked.
2. light fixture overheating protection circuit as claimed in claim 1, it is characterized in that, described detecting unit comprises the first resistance, the first electric capacity, the first triode, temperature-sensitive switch and the second resistance, one end of described the first resistance connects the input of described detecting unit, the other end of described the first resistance connects the first output of described detecting unit, one end of described the first electric capacity connects the other end of described the first resistance, the other end of described the first electric capacity connects the second output of described detecting unit, the collector electrode of described triode connects the first output of described detecting unit, the emitter of described triode connects the second output of described detecting unit, one end of described temperature-sensitive switch connects the input of described detecting unit, the other end of described temperature-sensitive switch connects described the second resistance to the second output of described detecting unit, the other end of described temperature-sensitive switch connects the base stage of described triode.
3. light fixture overheating protection circuit as claimed in claim 2, is characterized in that, the resistance of described the first resistance R 1 arranges according to described supply voltage.
4. light fixture overheating protection circuit as claimed in claim 1, it is characterized in that, described control unit comprises integrated circuit, the hot-wire coil of relay and the first diode, described integrated circuit comprises first input end, the second input, the 3rd input, the first output and the second output, the first input end of described integrated circuit and the second input all connect the first input end of described control unit, the 3rd input of described integrated circuit connects the second input of described detecting unit, the first output of described integrated circuit connects the output of described control unit, the second output of described integrated circuit connects one end of the hot-wire coil of described relay, the negative electrode of described the first diode connects the second output of described integrated circuit, the anode of the other end of the hot-wire coil of described relay and the first diode all connects the output of described control unit.
5. light fixture overheating protection circuit as claimed in claim 1, it is characterized in that, described switch element comprises commutator and protective resistance, described commutator comprises input, the first output and the second output, the input of described commutator connects the input of described switch element, the first output of described commutator connects the first output of described switch element, the second output of described commutator connects the second output of described switch element, described protective resistance is connected between first output and the second output of described switch element.
6. light fixture overheating protection circuit as claimed in claim 1, it is characterized in that, described light fixture overheating protection circuit also comprises capacitance decompression unit, described capacitance decompression unit comprises the second diode, the second electric capacity, the 3rd electric capacity, voltage-stabiliser tube and the 3rd resistance, described the second electric capacity and described the second diode are connected between the first input end of described power supply and described control unit, described the 3rd resistance and described the second Capacitance parallel connection, the negative electrode of described voltage-stabiliser tube connects the anode of described the second diode, the output of control unit described in the anodic bonding of described voltage-stabiliser tube, described the 3rd electric capacity is connected between the first input end and output of described control end.
7. light fixture overheating protection circuit as claimed in claim 1, is characterized in that, described protective resistance is thermistor.
8. light fixture overheating protection circuit as claimed in claim 4, is characterized in that, the model of described integrated circuit is NE555.
9. light fixture overheating protection circuit as claimed in claim 1, is characterized in that, described light fixture overheating protection circuit also comprises fuse, and described fuse is connected between described power supply and control unit.
10. a light fixture, is characterized in that, comprises the light fixture overheating protection circuit as described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310209772.1A CN104219816B (en) | 2013-05-30 | 2013-05-30 | lamp overheating protection circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310209772.1A CN104219816B (en) | 2013-05-30 | 2013-05-30 | lamp overheating protection circuit and lamp |
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| Publication Number | Publication Date |
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| CN104219816A true CN104219816A (en) | 2014-12-17 |
| CN104219816B CN104219816B (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310209772.1A Active CN104219816B (en) | 2013-05-30 | 2013-05-30 | lamp overheating protection circuit and lamp |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886499A (en) * | 1994-09-14 | 1996-04-02 | Hitachi Ltd | Air conditioner |
| JP2007174889A (en) * | 2005-11-10 | 2007-07-05 | Littelfuse Inc | Resettable circuit protective device |
| CN201044057Y (en) * | 2007-05-19 | 2008-04-02 | 徐敬柏 | Fixed form fan thermoregulation controller |
| CN201260253Y (en) * | 2007-12-30 | 2009-06-17 | 广东博宇水族实业有限公司 | Lamp control device in aquarium box |
| CN201420702Y (en) * | 2009-04-07 | 2010-03-10 | 徐敬柏 | Fixed fan temperature adjusting controller |
| CN102413619A (en) * | 2011-12-31 | 2012-04-11 | 重庆东灵网络信息技术有限责任公司 | Air-cooling radiation LED (light emitting diode) lamp |
-
2013
- 2013-05-30 CN CN201310209772.1A patent/CN104219816B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886499A (en) * | 1994-09-14 | 1996-04-02 | Hitachi Ltd | Air conditioner |
| JP2007174889A (en) * | 2005-11-10 | 2007-07-05 | Littelfuse Inc | Resettable circuit protective device |
| CN201044057Y (en) * | 2007-05-19 | 2008-04-02 | 徐敬柏 | Fixed form fan thermoregulation controller |
| CN201260253Y (en) * | 2007-12-30 | 2009-06-17 | 广东博宇水族实业有限公司 | Lamp control device in aquarium box |
| CN201420702Y (en) * | 2009-04-07 | 2010-03-10 | 徐敬柏 | Fixed fan temperature adjusting controller |
| CN102413619A (en) * | 2011-12-31 | 2012-04-11 | 重庆东灵网络信息技术有限责任公司 | Air-cooling radiation LED (light emitting diode) lamp |
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| Publication number | Publication date |
|---|---|
| CN104219816B (en) | 2017-02-08 |
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