CN204259262U - A kind of overtemperature protection module of LED actuation temperature warning circuit - Google Patents

A kind of overtemperature protection module of LED actuation temperature warning circuit Download PDF

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Publication number
CN204259262U
CN204259262U CN201420694364.XU CN201420694364U CN204259262U CN 204259262 U CN204259262 U CN 204259262U CN 201420694364 U CN201420694364 U CN 201420694364U CN 204259262 U CN204259262 U CN 204259262U
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CN
China
Prior art keywords
voltage comparator
module
led
overtemperature protection
temperature
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Expired - Fee Related
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CN201420694364.XU
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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 overtemperature protection module of LED actuation temperature warning circuit, it is characterized in that, comprise: the temperature sensor being positioned at LED module, the analog signal output of described temperature sensor is connected with the in-phase input end of a voltage comparator, the inverting input of this voltage comparator connects a reference voltage, the output of described voltage comparator obtains electric or dead electricity by the coil of the first switch controlled direct current relay, and the two ends of the normally opened contact of this direct current relay are connected with temperature-compensating end with one end of thermistor respectively; Described voltage comparator adopts hysteresis voltage comparator.

Description

A kind of overtemperature protection module of LED actuation temperature warning circuit
The application is divisional application, the application number of original application: 2014204106640, title: a kind of LED actuation temperature warning circuit, the applying date: 2014-07-23.
Technical field
The utility model relates to the field of LED overheating protection circuit, particularly relates to a kind of overtemperature protection module of LED actuation temperature warning circuit.
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 automatically alarm signal can be sent when overtemperature, remind maintenance personal to take corresponding maintenance operation, the useful life of LED module can be extended.
Utility model content
The purpose of this utility model is to provide a kind of overtemperature protection module of LED actuation temperature warning circuit, makes thermistor when temperature is relatively low, avoid the impact on LED drive chip output current at the temperature threshold of setting resnstance transformer.
In order to solve the problems of the technologies described above, the utility model provides a kind of overtemperature protection module of LED actuation temperature warning circuit, comprise: 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 voltage comparator, the inverting input of this voltage comparator connects a reference voltage, the output of described 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.
Further, in order to set forward temperature threshold and the negative sense temperature threshold of resnstance transformer, thermistor R is made ntcfluctuate in certain temperature range, more reasonable to the output current of LED drive chip, described voltage comparator adopts hysteresis voltage comparator.
Further, in order to solve the technical problem of lowering the temperature to the active of LED module, 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.
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, 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 by second switch management and control semiconductor cooler.
Further, in order to regulate reference voltage more easily, the series circuit that described reference voltage is made up of two resistance exports, and wherein, a resistance is adjustable potentiometer.
Technique scheme of the present utility model has the following advantages compared to existing technology: the utility model adds overtemperature protection module and warning device in LED drive circuit; to detect the temperature of LED module; send warning; protection LED module and LED lamp; to remind maintenance personal's Timeliness coverage fault, keep in repair.
Accompanying drawing explanation
The theory diagram of Fig. 1 LED actuation temperature warning circuit;
The circuit theory diagrams of the first execution mode of overtemperature protection module described in Fig. 2;
The circuit theory diagrams of the second execution mode of overtemperature protection module described in Fig. 3;
The voltage characteristic figure of Fig. 4 hysteresis voltage comparator;
The connecting circuit block diagram of Fig. 5 hysteresis voltage comparator and radiating module;
Wherein, thermistor R ntc, resistance R 1, R 2, R 5, R 6, 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
As shown in Figure 1; a kind of LED actuation temperature warning circuit; comprise: with the LED drive chip of temperature compensation function; for the civil power of input being converted to direct current supply LED drive chip rectification module; the LED module be connected with the current output terminal of described LED drive chip;, the temperature-compensating end of described LED drive chip is connected with an overtemperature protection module, and the output of described overtemperature protection module is connected with the control end of a warning device.
Wherein, described warning device can adopt audio alert chip, and the output of described overtemperature protection module realizes driving audio alert chip operation by control switch pipe.
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 two kinds of execution modes.
The first execution mode of described overtemperature protection module.
Described overtemperature protection module comprises: the temperature sensor being positioned at described LED module, and the analog signal output of described temperature sensor is connected with the in-phase input end of a voltage comparator A1, and the inverting input of this voltage comparator connects a reference voltage U r, the coil that the output of described voltage comparator A1 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.
The second execution mode of 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 4, 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 , 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 5, 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 is located at the semiconductor cooler between described cool guide sheet and fin, and the output of described hysteresis voltage comparator also controls semiconductor cooler by second switch pipe T2 and obtains electric.
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 '.

Claims (4)

1. the overtemperature protection module of a LED actuation temperature warning circuit, it is characterized in that, comprise: the temperature sensor being positioned at LED module, the analog signal output of described temperature sensor is connected with the in-phase input end of a voltage comparator, the inverting input of this voltage comparator connects a reference voltage, the output of described voltage comparator obtains electric or dead electricity by the coil of the first switch controlled direct current relay, and the two ends of the normally opened contact of this direct current relay are connected with temperature-compensating end with one end of thermistor respectively; Described voltage comparator adopts hysteresis voltage comparator.
2. overtemperature protection module according to claim 1, is characterized in that, 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.
3. overtemperature protection module according to claim 2; it is characterized in that; described radiating module comprises: refrigeration device; 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 by second switch management and control semiconductor cooler.
4. overtemperature protection module according to claim 3, is characterized in that, the series circuit that described reference voltage is made up of two resistance exports, and wherein, a resistance is adjustable potentiometer.
CN201420694364.XU 2014-07-23 2014-07-23 A kind of overtemperature protection module of LED actuation temperature warning circuit Expired - Fee Related CN204259262U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420694364.XU CN204259262U (en) 2014-07-23 2014-07-23 A kind of overtemperature protection module of LED actuation temperature warning circuit

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Application Number Priority Date Filing Date Title
CN201420694364.XU CN204259262U (en) 2014-07-23 2014-07-23 A kind of overtemperature protection module of LED actuation temperature warning circuit

Related Parent Applications (1)

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CN201420410664.0U Division CN204069458U (en) 2014-07-23 2014-07-23 A kind of LED actuation temperature warning circuit

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105188186A (en) * 2015-07-31 2015-12-23 苏州宏展信息科技有限公司 LED lamp tube heat dissipation control system with charge control
CN105578652A (en) * 2016-01-18 2016-05-11 上海康耐司信号设备有限公司 Over-temperature protection circuit and system for LED lamp
CN107065963A (en) * 2017-06-02 2017-08-18 安徽宝龙环保科技有限公司 A kind of temperature control and protection circuit for semiconductor chilling plate
CN110191542A (en) * 2019-06-22 2019-08-30 安徽华新光电饰业有限公司 A kind of temperature protector and its mounting process of LED lamp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105188186A (en) * 2015-07-31 2015-12-23 苏州宏展信息科技有限公司 LED lamp tube heat dissipation control system with charge control
CN105578652A (en) * 2016-01-18 2016-05-11 上海康耐司信号设备有限公司 Over-temperature protection circuit and system for LED lamp
CN107065963A (en) * 2017-06-02 2017-08-18 安徽宝龙环保科技有限公司 A kind of temperature control and protection circuit for semiconductor chilling plate
CN110191542A (en) * 2019-06-22 2019-08-30 安徽华新光电饰业有限公司 A kind of temperature protector and its mounting process of LED lamp
CN110191542B (en) * 2019-06-22 2021-07-20 安徽华新光电饰业有限公司 Temperature protector of LED lamp and mounting process thereof

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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