CN204259225U - A kind of LED self adaptation thermoregulation circuit - Google Patents

A kind of LED self adaptation thermoregulation circuit Download PDF

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Publication number
CN204259225U
CN204259225U CN201420694807.5U CN201420694807U CN204259225U CN 204259225 U CN204259225 U CN 204259225U CN 201420694807 U CN201420694807 U CN 201420694807U CN 204259225 U CN204259225 U CN 204259225U
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CN
China
Prior art keywords
led
module
temperature
drive chip
overtemperature protection
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Expired - Fee Related
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CN201420694807.5U
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Chinese (zh)
Inventor
张英
张前雄
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WUHAN GEMMY OPTOELECTRONICS Co Ltd
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WUHAN GEMMY OPTOELECTRONICS Co Ltd
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Abstract

The utility model relates to a kind of LED self adaptation thermoregulation circuit, comprising: LED drive chip, the LED module be connected with the current output terminal of this LED drive chip, and overtemperature protection module; The back side of described LED module is provided with radiating module, and described overtemperature protection module starts to control radiating module for the temperature gathering LED module; The utility model adds overtemperature protection module and radiating module in LED drive circuit, to detect the temperature of LED module, realizes cooling and controls, to play the effect of protection LED lamp.

Description

A kind of LED self adaptation thermoregulation circuit
The application is divisional application, the application number of original application: 2014204106212, title: a kind of LED self adaptation cooling light fixture, the applying date: 2014-07-23.
Technical field
The utility model relates to LED field, particularly relates to the LED self adaptation thermoregulation circuit of a kind of LED self adaptation cooling light fixture.
Background technology
At present, the application of LED is more and more extensive, and the LED light fixture for daily indoor and outdoor lighting is also just more and more universal.Current LED illumination is more and more towards high-power future development, and the high heat that great power LED brings is the key factor that puzzlement LED popularizes.If LED at high temperature works for a long time, then its life-span can shorten greatly, produces dead lamp phenomenon, causes light fixture to be scrapped.If cooling cannot be carried out in time to be controlled when overtemperature, then have a strong impact on the useful life of LED lamp.
Utility model content
The purpose of this utility model is to provide a kind of LED self adaptation thermoregulation circuit, which solves when temperature reaches beyond limit value, to the technical problem that LED module is lowered the temperature.
In order to solve the problems of the technologies described above, the utility model provides a kind of LED self adaptation thermoregulation circuit, comprising: LED drive chip, the LED module be connected with the current output terminal of this LED drive chip, and overtemperature protection module; The back side of described LED module is provided with radiating module, and described overtemperature protection module starts to control radiating module for the temperature gathering LED module.
Further; issues of temperature compensation is realized in order to solve; described LED drive chip adopts the LED drive chip with temperature compensation function; the temperature-compensating end of described LED drive chip is connected with described overtemperature protection module; be provided with thermistor in described LED module, described thermistor is connected with the temperature-compensating end of LED drive chip by overtemperature protection module.
Further, in order to set the temperature threshold of resnstance transformer, make thermistor is avoided LED drive chip output current impact when temperature is relatively low, described overtemperature protection module comprises: the temperature sensor being positioned at described LED module, the analog signal output of described temperature sensor is connected with the in-phase input end of a hysteresis voltage comparator, the inverting input of this hysteresis voltage comparator connects a reference voltage, the output of described hysteresis voltage comparator obtains electric or dead electricity by the coil of the first switch controlled direct current relay, the two ends of the normally opened contact of this direct current relay are connected with temperature-compensating end with one end of described thermistor respectively, the control end of described radiating module is connected with the output of hysteresis voltage comparator.
Further, in order to effectively reduce the power consumption of cooling, adopt the cooling device of low-power consumption, described radiating module comprises: refrigeration device, and is positioned at the radiator fan outside described refrigeration device; Described refrigeration device comprises: cool guide sheet, fin, and the semiconductor cooler be located between described cool guide sheet and fin, the output of described hysteresis voltage comparator also obtains electric and/or radiator fan rotation by second switch management and control semiconductor cooler.
Further, in order to solve the problem to LED module internal temperature sensing, described temperature sensor adopts thermocouple sensor, and its end of probe stretches in LED module.
Technique scheme of the present utility model has the following advantages compared to existing technology: the utility model adds overtemperature protection module and radiating module in LED drive circuit; to detect the temperature of LED module; realize cooling to control, to play the effect of protection LED lamp.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the utility model is described in further detail, wherein
The theory diagram of Fig. 1 LED self adaptation thermoregulation circuit;
The circuit theory diagrams of overtemperature protection module described in Fig. 2;
The voltage characteristic figure of Fig. 3 hysteresis voltage comparator;
The connecting circuit block diagram of Fig. 4 hysteresis voltage comparator and radiating module.
Wherein, thermistor R ntc, resistance R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, bi-directional voltage stabilizing pipe Z, direct current relay K, LED drive chip U1, forward threshold voltage u tH1 , negative sense threshold voltage u tH2 , the first switch transistor T 1, second switch pipe T2, reference voltage U r, temperature sensor output voltage Ucs, voltage comparator A1.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
Embodiment
As shown in Figure 1, a kind of LED self adaptation cooling light fixture, comprising: LED self adaptation thermoregulation circuit, this LED self adaptation thermoregulation circuit comprises: LED drive chip, the LED module be connected with the current output terminal of this LED drive chip, and overtemperature protection module; The back side of described LED module is provided with radiating module, and described overtemperature protection module starts to control radiating module for the temperature gathering LED module.
Described LED drive chip adopts the LED drive chip with temperature compensation function; the temperature-compensating end of described LED drive chip is connected with described overtemperature protection module; be provided with thermistor in described LED module, described thermistor is connected with the temperature-compensating end of LED drive chip by overtemperature protection module.
As shown in Figure 2, the utility model also solves the technical problem of temperature-compensating, is provided with thermistor R in described LED module ntc, this thermistor R ntcbe connected with the temperature-compensating end of described LED drive chip by described overtemperature protection module.
Described overtemperature protection module comprises: the temperature sensor being positioned at described LED module; the analog signal output of described temperature sensor is connected with the in-phase input end of a hysteresis voltage comparator, and the inverting input of this hysteresis voltage comparator connects a reference voltage U r, the coil that the output of described hysteresis voltage comparator controls direct current relay k by the first switch transistor T 1 obtains electric or dead electricity, the two ends of the normally opened contact of this direct current relay K respectively with described thermistor R ntcone end be connected with temperature-compensating end.
As shown in Figure 3, the course of work of described hysteresis voltage comparator comprises:
Set the forward threshold voltage of described hysteresis voltage comparator u tH1 , negative sense threshold voltage u tH2 ;
That is, described temperature sensor output voltage Ucs is from negative sense threshold voltage u tH2 when starting to raise, described hysteresis voltage comparator output low level, described first switch transistor T 1 disconnects, the coil losing electricity of direct current relay k, and normally opened contact disconnects; When described temperature sensor output voltage Ucs exceedes forward threshold voltage value u tH1 time, this hysteresis voltage comparator exports high level, and control the first switch transistor T 1 and close, the coil of direct current relay k obtains electric, and normally opened contact closes, thermistor R ntcin place in circuit;
Or described temperature sensor output voltage Ucs is from forward threshold voltage u tH1 when starting to decline, described hysteresis voltage comparator exports high level, controls the first switch transistor T 1 and closes, thermistor R ntcin place in circuit; When described temperature sensor output voltage Ucs equals negative sense threshold voltage value u tH2 time, this hysteresis voltage comparator output low level, controls the first switch transistor T 1 and disconnects, the coil losing electricity of direct current relay k, thermistor R ntcbe disconnected from the circuit.
Forward threshold voltage
Negative sense threshold voltage
If get 0, and set suitable reference voltage U rforward threshold voltage can be obtained u tH1 with negative sense threshold voltage u tH2 , as shown in Figure 4, and reference voltage U rcorresponding with the limit temperature value of LED module.
On the basis of above-mentioned two kinds of execution modes, described thermistor can adopt negative tempperature coefficient thermistor; Described LED drive chip can adopt the LED drive chip such as SN3352, SN3910.
Concrete according to SN3352 chip, then the R of this chip tHtermination one temperature-compensating starting point setting resistance, as described thermistor R ntcby the rising of temperature, when its resistance reduces equal as temperature-compensating starting point setting resistance, then SN3352 chip output current reduces.
According to SN3910 chip, then the U of this chip rEFconnection one temperature-compensating starting point setting resistance is held, thermistor R with LD ntcset resistant series with temperature-compensating starting point, and the voltage of LD end obtains according to series connection dividing potential drop; By described thermistor R ntcby the rising of temperature, its resistance reduces, and to change the voltage of LD end, this voltage drop reduces to make SN3910 chip output current.
As shown in Figure 4, the back side of described LED module is also provided with radiating module, and the control end of this radiating module is connected with the output of described hysteresis voltage comparator.
Described radiating module comprises: refrigeration device, and is positioned at the radiator fan outside described refrigeration device;
Described refrigeration device comprises: cool guide sheet, fin, and the semiconductor cooler be located between described cool guide sheet and fin, the output of described hysteresis voltage comparator also controls semiconductor cooler by second switch pipe T2 and obtains electric and/or radiator fan rotation.
The series circuit that described reference voltage is made up of two resistance (as resistance R1, R7) exports, and wherein, a resistance is adjustable potentiometer, as resistance R7.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.

Claims (2)

1. a LED self adaptation thermoregulation circuit, is characterized in that comprising: LED drive chip, the LED module be connected with the current output terminal of this LED drive chip, and overtemperature protection module;
The back side of described LED module is provided with radiating module, and described overtemperature protection module starts to control radiating module for the temperature gathering LED module.
2. LED self adaptation thermoregulation circuit according to claim 1; described LED drive chip adopts the LED drive chip with temperature compensation function; the temperature-compensating end of described LED drive chip is connected with described overtemperature protection module; be provided with thermistor in described LED module, described thermistor is connected with the temperature-compensating end of LED drive chip by overtemperature protection module.
CN201420694807.5U 2014-07-23 2014-07-23 A kind of LED self adaptation thermoregulation circuit Expired - Fee Related CN204259225U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420694807.5U CN204259225U (en) 2014-07-23 2014-07-23 A kind of LED self adaptation thermoregulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420694807.5U CN204259225U (en) 2014-07-23 2014-07-23 A kind of LED self adaptation thermoregulation circuit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201420410621.2U Division CN204046872U (en) 2014-07-23 2014-07-23 A kind of LED self adaptation cooling light fixture

Publications (1)

Publication Number Publication Date
CN204259225U true CN204259225U (en) 2015-04-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420694807.5U Expired - Fee Related CN204259225U (en) 2014-07-23 2014-07-23 A kind of LED self adaptation thermoregulation circuit

Country Status (1)

Country Link
CN (1) CN204259225U (en)

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20150408

Termination date: 20180723