CN104219816B - lamp overheating protection circuit and lamp - Google Patents
lamp overheating protection circuit and lamp Download PDFInfo
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- CN104219816B CN104219816B CN201310209772.1A CN201310209772A CN104219816B CN 104219816 B CN104219816 B CN 104219816B CN 201310209772 A CN201310209772 A CN 201310209772A CN 104219816 B CN104219816 B CN 104219816B
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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 protection circuit, more particularly, 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 high, at high temperature, the long-time work of light fixture
Work can damage light fixture, reduces the life-span of light fixture.
Content of the invention
The technical problem to be solved in the present invention is to overcome the shortcomings of that above-mentioned prior art exists, and proposes a kind of light fixture mistake
Thermal protection circuit and light fixture, can solve the problem that light fixture work long hours can temperature too high thus damaging the problem of light fixture.
For solving above-mentioned technical problem, the present invention proposes a kind of light fixture overheating protection circuit, and it is connected to power supply and lamp
Between tool, it includes：Detector unit, it is used for detecting the temperature of light fixture, it is defeated that it includes input, the first output end and second
Go out end, the input of detector unit connects the positive pole of power supply, the second output end of detector unit connects the negative pole of power supply；Control single
Unit, it includes first input end, the second input and output end, the first input end connecting detection unit of control unit defeated
Enter end, the first output end of the second input connecting detection unit of control unit, the output end connecting detection list of control unit
Second output end of unit；Switch element, it is controlled by control unit, and it includes input, the first output end and the second output
End, the input of switch element connects power supply, and the second output end of switch element connects light fixture；And fan, it is used for as lamp
Tool cooling, the first output end of its connecting valve unit；Wherein, when the temperature that detector unit detects light fixture is higher than protection value
When, the input of control unit controlling switch unit and the first output end conducting, fan work be light fixture cooling, light fixture is with relatively low
Power work, when detector unit detect light fixture temperature be less than protection value when, the input of control unit controlling switch unit
End is quit work with the second output end conducting, fan, light fixture normal work.
Preferably, detector unit includes first resistor, the first electric capacity, the first triode, temperature-sensitive switch and second resistance,
The input of one end connecting detection unit of first resistor, the first output end of the other end connecting detection unit of first resistor,
The other end of one end connection first resistor of the first electric capacity, the second output end of the other end connecting detection unit of the first electric capacity,
First output end of the colelctor electrode connecting detection unit of triode, the second output of the emitter stage connecting detection unit of triode
End, the input of one end connecting detection unit of temperature-sensitive switch, the other end of temperature-sensitive switch connects second resistance to detector unit
The second output end, the base stage of the other end connecting triode of temperature-sensitive switch.
Preferably, the resistance of first resistor R1 is configured according to supply voltage.
Preferably, control unit includes integrated circuit, the hot-wire coil of relay and the first diode, integrated circuit bag
Include first input end, the second input, the 3rd input, the first output end and the second output end, the first of integrated circuit is defeated
Enter end and the second input is all connected with the first input end of control unit, the 3rd input connecting detection unit of integrated circuit
The second input, the first output end of integrated circuit connects the output end of control unit, and the second output end of integrated circuit is even
One end of the hot-wire coil of contact relay, the negative electrode of the first diode connects the second output end of integrated circuit, relay logical
The anode of the other end of electric coil and the first diode is all connected with the output end of control unit.
Preferably, switch element includes commutator and protective resistance, and commutator includes input, the first output end
And second output end, the input of the input connecting valve unit of commutator, the first output end of commutator connects
First output end of switch element, the second output end of the second output end connecting valve unit of commutator, protective resistance is even
It is connected between the first output end and second output end of switch element.
Preferably, light fixture overheating protection circuit also includes capacitance decompression unit, capacitance decompression unit include the second diode,
Second electric capacity, the 3rd electric capacity, voltage-stabiliser tube and 3rd resistor, the second electric capacity and the second Diode series in power supply and control single
Between the first input end of unit, 3rd resistor is in parallel with the second electric capacity, and the negative electrode of voltage-stabiliser tube connects the anode of the second diode, surely
The anode of pressure pipe connects the output end of control unit, the 3rd capacitance connection the first input end of control end and output end it
Between.
Preferably, protective resistance is thermistor.
Preferably, model NE555 of integrated circuit.
Preferably, light fixture overheating protection circuit also includes fuse, and fuse is connected between power supply and control unit.
The present invention also proposes a kind of light fixture, including light fixture overheating protection circuit as above.
Compared with prior art, the light fixture overheating protection circuit of the present invention and light fixture, by detecting the temperature of light fixture
Higher than controlling fan work during protection value, for its cooling, light fixture can be protected to work under long-time high temperature and to be hardly damaged, extend
Life-span of light fixture.
Brief description
Fig. 1 is the circuit structure diagram of the light fixture overheating protection circuit of the present invention.
Description of reference numerals is as follows：Detector unit 1 first resistor R1 the first electric capacity C1 the first triode Q1 is temperature sensitive to be opened
Close hot-wire coil K the first diode D1 switch element 3 of S1 second resistance R2 control unit 2 integrated circuit U1 relay
Commutator K1 thermistor RT1 capacitance decompression unit 4 second diode D2 the second electric capacity C2 the 3rd electric capacity C3 voltage stabilizing
Pipe ZD1 3rd resistor R3 fuse FS fan M1 light fixture LAMP.
Specific embodiment
In order to further illustrate principle and the structure of the present invention, in conjunction with accompanying drawing, the preferred embodiments of the present invention are carried out in detail
Describe in detail bright.
Refer to Fig. 1, the light fixture overheating protection circuit of the present invention, it is connected between power supply and light fixture LAMP, its bag
Include：Detector unit 1, control unit 2, switch element 3, capacitance decompression unit 4 and fan M1.
Detector unit 1 is used for detecting the temperature of light fixture LAMP, and switch element 3 is controlled by control unit 2, fan M1 be used for be
Light fixture LAMP lowers the temperature.Detector unit 1 includes input, the first output end and the second output end, and the input of detector unit 1 is even
Connect the positive pole of power supply, the second output end of detector unit 1 connects the negative pole of power supply.Control unit 2 include first input end, second
Input and output end, the input of the first input end connecting detection unit 1 of control unit 2, the second of control unit 2 is defeated
Enter to hold the first output end of connecting detection unit 1, the second output end of the output end connecting detection unit 1 of control unit 2.Switch
Unit 3 includes input, the first output end and the second output end, and the input of switch element 3 connects power supply, switch element 3
Second output end connect light fixture LAMP.First output end of its connecting valve unit 3 of fan M1.Wherein, when detector unit 1 is examined
When the temperature measuring light fixture LAMP is higher than protection value, the input of control unit 2 controlling switch unit 3 is led with the first output end
Logical, fan M1 works and lowers the temperature for light fixture LAMP, and light fixture LAMP is worked with relatively low power, when detector unit 1 detects light fixture
When the temperature of LAMP is less than protection value, the input of control unit 2 controlling switch unit 3 is turned on its second output end, fan
M1 quits work, light fixture LAMP normal work.
Detector unit 1 includes first resistor R1, the first electric capacity C1, the first triode Q1, temperature-sensitive switch S1 and the second electricity
Resistance R2.The input of one end connecting detection unit 1 of first resistor R1, the other end connecting detection unit 1 of first resistor R1
First output end, the positive pole of the first electric capacity C1 connects the other end of first resistor R1, the negative pole connecting detection list of the first electric capacity C1
Second output end of unit 1, the first output end of the colelctor electrode connecting detection unit 1 of triode, the emitter stage of triode connects inspection
Survey the second output end of unit 1, the input of one end connecting detection unit 1 of temperature-sensitive switch S1, the other end of temperature-sensitive switch S1
Connect second resistance R2 to the second output end of detector unit 1, the base stage of the other end connecting triode of temperature-sensitive switch S1.This reality
Apply in example, the resistance of first resistor R1 is configured according to supply voltage, in the first triode Q1 conducting, the partial pressure at its two ends
More than supply voltage 2/3rds.
Control unit 2 includes integrated circuit U1, the hot-wire coil K of relay and the first diode D1.Integrated circuit U1
Including first input end, the second input, the 3rd input, the first output end and the second output end.The of integrated circuit U1
One input and the second input are all connected with the first input end of control unit 2, and the 3rd input of integrated circuit U1 connects
Second input of detector unit 1, first output end of integrated circuit U1 connects the output end of control unit 2, integrated circuit U1
The second output end connect relay hot-wire coil K one end, the negative electrode of the first diode D1 connects the of integrated circuit U1
Two output ends, the anode of the other end of hot-wire coil K of relay and the first diode D1 is all connected with the output of control unit 2
End.
In the present embodiment, model NE555 of integrated circuit U1.Therefore, the reset terminal of chip NE555 is integrated circuit U1
First input end, the power end of chip NE555 is second input of integrated circuit U1, and the triggering end of chip NE555 is collection
Become the 3rd input of circuit U 1, the earth terminal of chip NE555 is first output end of integrated circuit U1, and chip NE555's is defeated
Go out the second output end for integrated circuit U1 for the end.According to the characteristic of chip NE555, the 3rd input of integrated circuit U1 receives
When the voltage of detector unit 1 first output end output is less than 1/3rd of supply voltage, second output end of integrated circuit U1
Output high level, that is, when the voltage that the triggering end of chip NE555 receives is less than 1/3rd of supply voltage, chip NE555
Output end output high level, relay hot-wire coil K energising.
Switch element 3 includes commutator K1 and protective resistance.In the present embodiment, protective resistance is thermistor RT1.
Commutator K1 includes input, the first output end and the second output end, the input connecting valve unit 3 of commutator K1
Input, the first output end of the first output end connecting valve unit 3 of commutator K1, commutator K1 second output
Second output end of end connecting valve unit 3, thermistor RT1 is connected to input and second output end of switch element 3
Between.In other embodiments, it would however also be possible to employ the resistance of larger resistance is so that when light fixture LAMP is overheated, light fixture LAMP can only
Work under less power.
Capacitance decompression unit 4 includes the second diode D2, the second electric capacity C2, the 3rd electric capacity C3, voltage-stabiliser tube ZD1 and the 3rd
Resistance R3.Second electric capacity C2 and the second diode D2 is connected between power supply and the first input end of control unit 2, the 3rd electricity
R3 is in parallel with the second electric capacity C2 for resistance, and the negative electrode of voltage-stabiliser tube ZD1 connects the anode of the second diode D2, and the anode of voltage-stabiliser tube ZD1 is even
Connect the output end of control unit 2, the 3rd electric capacity C3 is connected between first input end and the output end of control unit 2.This reality
Apply in example, 4 alternating voltages of capacitance decompression unit are converted to the DC voltage of 11V.
Light fixture overheating protection circuit also includes fuse FS.Fuse FS is connected between power supply and control unit 2, energy
Enough when voltage is excessive, the element of protection circuit.
The present invention also proposes a kind of light fixture, including above-mentioned light fixture overheating protection circuit.
To describe the operation principle of the present invention with reference to Fig. 1 in detail.
When temperature is normal, capacitance decompression unit 4 output 11V DC voltage is powered for chip NE555, by first resistor R1
Charge to the first electric capacity C1, now thermistor RT is equivalent to open circuit, and second resistance R2 both end voltage is very low, the first triode Q1
Disconnect.The triggering end of chip NE555 is in high potential, and output end no exports, and hot-wire coil K does not have electric current to flow through, and relay is not
Work, the path that alternating current passes through the commutator K1 of relay is motor, and thermistor RT1 is shorted, and does not work,
Light fixture LAMP normal work.
After the light fixture LAMP working time is very long, when temperature rises above protection value, temperature-sensitive switch S1 conducting is so that the
One triode Q1 conducting, by the voltage pull-down of the triggering end of chip NE555 to during less than supply voltage 1/3, chip NE555's is defeated
Go out end to start to export high level, hot-wire coil K flows through electric current so that relay obtains electric work, and commutator K1 is connect with fan M1
Logical, fan M1 obtains electric work, is light fixture LAMP radiating.Simultaneously light fixture LAMP pass through thermistor RT1 current limliting, luminance-reduction, but
Will not extinguish, can continue to provide illumination for people.Until fan M1 drops to below protection value for light fixture LAMP, temperature-sensitive switch S1 breaks
Open, so circulate work.
Compared with prior art, the light fixture overheating protection circuit of the present invention and light fixture, by detecting the temperature of light fixture
Higher than controlling fan work during protection value, for its cooling, light fixture can be protected to work under long-time high temperature and to be hardly damaged, extend
Life-span of light fixture, and circuit components are less, structure is more simple.
The foregoing is only the preferable possible embodiments of the present invention, not limit the scope of the invention.All utilizations are originally
Equivalent structure change done by description of the invention and accompanying drawing content, is all contained in protection scope of the present invention.
Claims (9)
1. a kind of light fixture overheating protection circuit, it is connected between power supply and light fixture it is characterised in that it includes：
Detector unit, it is used for detecting the temperature of described light fixture, it includes input, the first output end and the second output end,
The input of described detector unit connects the positive pole of described power supply, and the second output end of described detector unit connects described power supply
Negative pole；
Control unit, it includes first input end, the second input and output end, and the first input end of described control unit is even
Connect the input of described detector unit, the second input of described control unit connects the first output end of described detector unit,
The output end of described control unit connects the second output end of described detector unit；
Switch element, it is controlled by described control unit, and it includes input, the first output end and the second output end, described
The input of switch element connects described power supply, and the second output end of described switch element connects described light fixture, wherein, described opens
Close unit and include commutator and protective resistance, described commutator includes input, the first output end and the second output
End, the input of described commutator connects the input of described switch element, and the first output end of described commutator connects
First output end of described switch element, the second output end of described commutator connects the second output of described switch element
End, described protective resistance is connected between input and second output end of described switch element；And
Fan, it is used for as the cooling of described light fixture, the first output end of its described switch element of connection；
Wherein, when the temperature that described detector unit detects described light fixture is higher than protection value, described control unit controls described
The input of switch element and the conducting of the first output end, described fan work is described light fixture cooling, and described light fixture is with relatively low
Power works, and when the temperature that described detector unit detects described light fixture is less than described protection value, described control unit controls
The input of described switch element and the conducting of the second output end, described fan quits work, described light fixture normal work.
2. light fixture overheating protection circuit as claimed in claim 1 it is characterised in that described detector unit include first resistor,
First electric capacity, the first triode, temperature-sensitive switch and second resistance, one end of described first resistor connects described detector unit
Input, the other end of described first resistor connects the first output end of described detector unit, and the positive pole of described first electric capacity is even
Connect the other end of described first resistor, the negative pole of described first electric capacity connects the second output end of described detector unit, described three
The colelctor electrode of pole pipe connects the first output end of described detector unit, and the emitter stage of described triode connects described detector unit
Second output end, one end of described temperature-sensitive switch connects the input of described detector unit, and the other end of described temperature-sensitive switch is even
Connect described second resistance to the second output end of described detector unit, the other end of described temperature-sensitive switch connects described triode
Base stage.
3. light fixture overheating protection circuit as claimed in claim 2 is it is characterised in that the resistance of described first resistor R1 is according to institute
State supply voltage to be configured.
4. light fixture overheating protection circuit as claimed in claim 1 it is characterised in that described control unit include integrated circuit,
The hot-wire coil of relay and the first diode, described integrated circuit includes first input end, the second input, the 3rd input
End, the first output end and the second output end, the first input end of described integrated circuit and the second input are all connected with described
The first input end of control unit, the 3rd input of described integrated circuit connects the second input of described detector unit, institute
The first output end stating integrated circuit connects the output end of described control unit, and the second output end of described integrated circuit connects institute
State one end of the hot-wire coil of relay, the negative electrode of described first diode connects the second output end of described integrated circuit, institute
The anode of the other end and the first diode of stating the hot-wire coil of relay is all connected with the output end of described control unit.
5. light fixture overheating protection circuit as claimed in claim 1 is it is characterised in that described light fixture overheating protection circuit also includes
Capacitance decompression unit, described capacitance decompression unit includes the second diode, the second electric capacity, the 3rd electric capacity, voltage-stabiliser tube and the 3rd
Resistance, described second electric capacity and described second Diode series described power supply and described control unit first input end it
Between, described 3rd resistor is in parallel with described second electric capacity, and the negative electrode of described voltage-stabiliser tube connects the anode of described second diode, institute
The anode stating voltage-stabiliser tube connects the output end of described control unit, and described 3rd capacitance connection is in the first input of described control end
Between end and output end.
6. light fixture overheating protection circuit as claimed in claim 1 is it is characterised in that described protective resistance is thermistor.
7. light fixture overheating protection circuit as claimed in claim 4 is it is characterised in that model NE555 of described integrated circuit.
8. light fixture overheating protection circuit as claimed in claim 1 is it is characterised in that described light fixture overheating protection circuit also includes
Fuse, described fuse is connected between described power supply and control unit.
9. a kind of light fixture is it is characterised in that include the light fixture overheating protection circuit as described in claim 1 to 8 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104219816A CN104219816A (en) | 2014-12-17 |
| CN104219816B true CN104219816B (en) | 2017-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310209772.1A Active CN104219816B (en) | 2013-05-30 | 2013-05-30 | lamp overheating protection circuit and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104219816B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044057Y (en) * | 2007-05-19 | 2008-04-02 | 徐敬柏 | Fixed form fan thermoregulation controller |
| CN201420702Y (en) * | 2009-04-07 | 2010-03-10 | 徐敬柏 | Fixed fan temperature adjusting controller |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886499A (en) * | 1994-09-14 | 1996-04-02 | Hitachi Ltd | Air conditioner |
| US7342762B2 (en) * | 2005-11-10 | 2008-03-11 | Littelfuse, Inc. | Resettable circuit protection apparatus |
| 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 |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044057Y (en) * | 2007-05-19 | 2008-04-02 | 徐敬柏 | Fixed form fan thermoregulation controller |
| CN201420702Y (en) * | 2009-04-07 | 2010-03-10 | 徐敬柏 | Fixed fan temperature adjusting controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104219816A (en) | 2014-12-17 |
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