CN201750600U - Temperature control circuit of large power white light LED lamp - Google Patents
Temperature control circuit of large power white light LED lamp Download PDFInfo
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- CN201750600U CN201750600U CN2010202798776U CN201020279877U CN201750600U CN 201750600 U CN201750600 U CN 201750600U CN 2010202798776 U CN2010202798776 U CN 2010202798776U CN 201020279877 U CN201020279877 U CN 201020279877U CN 201750600 U CN201750600 U CN 201750600U
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Abstract
The utility model discloses a control circuit, particularly a temperature control circuit of a large power white light LED lamp, comprising: connecting a voltage regulating circuit and a temperature sensor LM35 to the two input ends of the operational amplifier IC respectively, and connecting the output end of the operational amplifier IC to the constant-current source circuit composed of the DN, the resistor and the luminous tube group DM by the diode. The non-inverting input voltage of the operational amplifier IC is set by the voltage regulating circuit, when the LM35D output voltage is larger than the non-inverting input voltage of the operational amplifier IC, the current value in the constant-current source circuit is reduced to preventing the knot temperature from further rising, thereby making the knot temperature of the luminous tube group DM will not exceed the permitted maximum temperature.
Description
Technical field
The utility model relates to a kind of control circuit, especially is a kind of too high temperature control circuit of large power white light LED lamp junction temperature that prevents.
Background technology
White LED lamp because of its have use low-tension supply, power consumption less, advantages such as strong, the stability height of applicability, response time weak point, environmentally safe, be widely used in lighting field in recent years.But owing to can not guarantee that the P-N knot is extreme perfect when making the LED lamp, even some element has bad electrode structure, causes LED lamp energising back junction temperature too high, after junction temperature surpasses certain numerical value, can have a strong impact on the useful life of LED lamp.Too high for preventing junction temperature, the good radiator of thermal conductivity generally is installed on the present white light LEDs light fixture, heat is dispersed into the external world.Because this passive thermaltransmission mode efficient is lower, can not fast heat be distributed, the LED light temperature is still worked on above behind the regulation numerical value, reduced the useful life of LED lamp.
The utility model content
For overcoming above-mentioned technical problem, the utility model provides a kind of large power white light LED lamp temperature control circuit that prevents that the white LED lamp junction temperature is too high.
For realizing above-mentioned technical purpose, the utility model is achieved through the following technical solutions: a kind of large power white light LED lamp temperature control circuit, the temperature sensor LM35D that comprises a cut-in operation circuit, temperature sensor LM35D output connects the inverting input of transport and placing device IC, and the in-phase input end of transport and placing device IC is connected on the regulating circuit; The output of transport and placing device IC connects a DN who is in series by a plurality of diodes by diode D3, the positive terminal of DN connects the base stage of resistance R 5 and triode C, resistance R 5 connects power supply, the collector electrode of triode C connects the negative pole end of the luminous tube group DM of LED lamp, the positive terminal of DM connects power supply, the emitter of triode C connects resistance R 6, and the negative pole end of resistance R 6 and DN is connected the common ground end.
The beneficial effects of the utility model are: temperature sensor LM35D is sticked on the lamp radiator, adjust the positive input voltage of transport and placing device IC, when junction temperature is too high when causing the LM35D output voltage greater than transport and placing device IC homophase input voltage, transport and placing device IC output output electronegative potential, and the base stage of passing through diode D3 and triode C is connected, make the operating current of luminous tube group DM reduce, prevent that junction temperature from further raising.And then the junction temperature that makes luminous tube group DM is no more than the maximum temperature of permission.
Description of drawings
Accompanying drawing is the utility model circuit diagram.
Embodiment
Referring to accompanying drawing, the regulating circuit that is made of resistance R 1 series connection potentiometer R2 connects the in-phase input end of transport and placing device IC, the temperature sensor LM35D output of cut-in operation circuit connects the inverting input of transport and placing device IC, the output of transport and placing device IC connects the negative pole of diode D3, the anodal DN that is in series by a plurality of diodes that connects of diode D3, the positive terminal of DN connects the base stage of resistance R 5 and triode C, resistance R 5 connects power supply, the collector electrode of triode C connects the negative pole end of luminous tube group DM, the positive terminal of luminous tube group DM connects power supply, the emitter of triode C connects resistance R 6, and resistance R 6 is connected the common ground end with the negative pole end of ND.DN, triode C, luminous tube group DM, resistance R 5, R6 form constant-current circuit, constant current value I=(triode C base voltage-0.6 volt)/R6, and I is the working current value of DM.
Described diode D3 is a Schottky diode.
Described LM35D is a temperature sensor of the prior art, and its output voltage is directly proportional with Celsius temperature, and temperature coefficient is 10 millivolts/℃.
In the real world applications, temperature sensor LM35D is sticked on the radiator of light fixture, the temperature of setting radiator must not be higher than T ℃, promptly must not make the output voltage of LM35D be higher than the 10T millivolt, the current potential that adjustment potentiometer R2 is ordered A is the 10T millivolt, when the temperature of radiator is higher than T, the output voltage of LM35D is higher than the 10T millivolt, transport and placing device IC exports electronegative potential, makes diode D3 be in conducting state, makes B point current potential descend, and then make constant current value I=(B point voltage-0.6 volt)/R6 descend, reduction owing to luminous tube group DM operating current has reduced the generation of Joule heat, and makes junction temperature descend by the heat radiation of radiator; When radiator temperature is no more than T ℃, the output voltage of LM35D is lower than the 10T millivolt, and transport and placing device IC exports high potential, and diode D3 is in cut-off state, do not influence constant current value I=(triode C base voltage-0.6 volt)/R6, the operating current of luminous tube group DM is constant.
Claims (3)
1. large power white light LED lamp temperature control circuit, the temperature sensor LM35D that comprises a cut-in operation circuit, it is characterized in that: temperature sensor LM35D output connects the inverting input of transport and placing device IC, and the in-phase input end of transport and placing device IC is connected on the regulating circuit; The output of transport and placing device IC connects a DN who is in series by a plurality of diodes by diode D3, the positive terminal of DN connects the base stage of resistance R 5 and triode C respectively, resistance R 5 connects power supply, the collector electrode of triode C connects the negative pole end of the luminous tube group DM of LED lamp, the positive terminal of DM connects power supply, the emitter of triode C connects resistance R 6, and the negative pole end of resistance R 6 and DN is connected the common ground end.
2. a kind of large power white light LED lamp temperature control circuit according to claim 1, it is characterized in that: diode D3 is a Schottky diode.
3. a kind of large power white light LED lamp temperature control circuit according to claim 1 is characterized in that: regulating circuit is made of resistance R 1 series connection potentiometer R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202798776U CN201750600U (en) | 2010-08-03 | 2010-08-03 | Temperature control circuit of large power white light LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202798776U CN201750600U (en) | 2010-08-03 | 2010-08-03 | Temperature control circuit of large power white light LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201750600U true CN201750600U (en) | 2011-02-16 |
Family
ID=43585274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202798776U Expired - Fee Related CN201750600U (en) | 2010-08-03 | 2010-08-03 | Temperature control circuit of large power white light LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201750600U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364851A (en) * | 2011-10-24 | 2012-02-29 | 无锡芯朋微电子有限公司 | Circuit converting high-voltage power supply into low-voltage power supply for enabling zero switching current of chip |
| CN102573233A (en) * | 2012-01-10 | 2012-07-11 | 张从峰 | Light-emitting diode (LED) intelligent module capable of performing voltage self-regulation |
-
2010
- 2010-08-03 CN CN2010202798776U patent/CN201750600U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364851A (en) * | 2011-10-24 | 2012-02-29 | 无锡芯朋微电子有限公司 | Circuit converting high-voltage power supply into low-voltage power supply for enabling zero switching current of chip |
| CN102573233A (en) * | 2012-01-10 | 2012-07-11 | 张从峰 | Light-emitting diode (LED) intelligent module capable of performing voltage self-regulation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20110803 |