CN202231929U - LED over-temperature protective circuit - Google Patents
LED over-temperature protective circuit Download PDFInfo
- Publication number
- CN202231929U CN202231929U CN2011203923176U CN201120392317U CN202231929U CN 202231929 U CN202231929 U CN 202231929U CN 2011203923176 U CN2011203923176 U CN 2011203923176U CN 201120392317 U CN201120392317 U CN 201120392317U CN 202231929 U CN202231929 U CN 202231929U
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- pin
- led
- resistance
- temperature
- protective circuit
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- Expired - Fee Related
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Abstract
An LED over-temperature protective circuit provided by the utility model comprises a chip, wherein, an OE pin, a VDD pin, a GND pin, an OUT pin and an R-EXT pin are arranged on the chip; the OE pin is connected with a capacitor C1; the OUT pin is connected with an LED group; the capacitor C1 and the LED group are connected in parallel; a resistor R1 is arranged between the VDD pin and the OE pin; a voltage stabilizing pipe VD1 is arranged between the VDD pin and the GND pin; and the R-EXT pin is connected with a temperature protective circuit. In the utility model, the problem that the brightness of the LED fades and the LED is even damaged due to the over high temperature caused by long-time use is solved. Therefore, the LED over-temperature protective circuit has the advantages of simple structure, low cost, good temperature controlling effect, and the like.
Description
Technical field
The utility model relates to the LED field, is specifically related to a kind of LED thermal-shutdown circuit.
Background technology
It is imperative at present that the LED lamp of use high brightness is done light source; Though and high-brightness LED can send enough light when using; With the use number of minimizing LED, but it can produce heat, under regular service conditions; How many working flows of LED is, can produce how high temperature to LED can expect.But when fault took place, the too high meeting of temperature made the brightness of LED produce decay even damages LED.
Summary of the invention
The purpose of the utility model provides a kind of LED thermal-shutdown circuit, works long hours to solve LED, makes the too high meeting of its temperature make the brightness of LED produce decay even damage LED.
For realizing above-mentioned purpose, the utility model has adopted following technical scheme:
A kind of LED thermal-shutdown circuit comprises chip, and said chip is provided with the OE pin, VDD pin, GND pin, OUT pin and R-EXT pin; Said OE pin is connected with capacitor C 1; Said OUT pin is connected with the LED group; Said capacitor C 1 is parallelly connected with the LED group; Be provided with resistance R 1 between said VDD pin and the OE pin; Be provided with voltage-stabiliser tube VD1 between said VDD pin and the GND pin; Said R-EXT pin is connected with temperature protection circuit.Described temperature protection circuit comprises resistance R 2, the resistance R 3 of connecting with resistance R 2; Negative temperature thermistor NTC, the resistance R 4 of connecting with negative temperature thermistor NTC; Said temperature protection circuit also comprises diode VD2, and said diode VD2 draws between resistance R 2 and resistance R 3, is connected between negative temperature thermistor NTC and the resistance R 4.
Owing to adopt above technical scheme, the utlity model has following advantage:
1, the temperature protection circuit through increasing; Can to the LED lamp its temperature be risen effectively, again through behind the sensing of negative temperature thermistor NTC, behind the information adjustment thermistor through sensing; The electric current of LED is descended, thereby reached the purpose of protection.
2, this protective circuit is simple in structure, and is with low cost, and temperature control effect is fine, contained the rising of temperature, thus the useful life of the LED that prolongs.
Description of drawings
The structural representation of Fig. 1 the utility model.
Embodiment
LED thermal-shutdown circuit as shown in Figure 1, that the utility model provides comprises chip 1, and chip 1 is provided with the OE pin, VDD pin, GND pin, OUT pin and R-EXT pin; The OE pin is connected with capacitor C 1; The OUT pin is connected with LED group 2; It is 2 parallelly connected that capacitor C 1 and LED organize; Be provided with resistance R 1 between said VDD pin and the OE pin; Be provided with voltage-stabiliser tube VD1 between VDD pin and the GND pin; The R-EXT pin is connected with temperature protection circuit 3.Temperature protection circuit 3 comprises resistance R 2, the resistance R 3 of connecting with resistance R 2; Negative temperature thermistor NTC, the resistance R 4 of connecting with negative temperature thermistor NTC; Temperature protection circuit 3 also comprises diode VD2, and said diode VD2 draws between resistance R 2 and resistance R 3, is connected between negative temperature thermistor NTC and the resistance R 4.Wherein negative temperature thermistor NTC can connect the temperature of sensing LED onboard, and when the temperature of LED raise, the resistance of thermistor can decrease, and the voltage U 2 of this moment also can increase.When voltage U 2 during greater than voltage U 1, the electric current of LED can begin to descend up to hygral equilibrium.The model of its chips 1 is MBI1801.
Claims (1)
1. a LED thermal-shutdown circuit comprises chip, and said chip is provided with the OE pin, VDD pin, GND pin, OUT pin and R-EXT pin; Said OE pin is connected with capacitor C 1; Said OUT pin is connected with the LED group; Said capacitor C 1 is parallelly connected with the LED group; Be provided with resistance R i between said VDD pin and the OE pin; Be provided with voltage-stabiliser tube VD1 between said VDD pin and the GND pin; It is characterized in that: said R-EXT pin is connected with temperature protection circuit; Described temperature protection circuit comprises resistance R 2, the resistance R 3 of connecting with resistance R 2; Negative temperature thermistor NTC, the resistance R 4 of connecting with negative temperature thermistor NTC; Said temperature protection circuit also comprises diode VD2, and said diode VD2 draws between resistance R 2 and resistance R 3, is connected between negative temperature thermistor NTC and the resistance R 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203923176U CN202231929U (en) | 2011-10-17 | 2011-10-17 | LED over-temperature protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203923176U CN202231929U (en) | 2011-10-17 | 2011-10-17 | LED over-temperature protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231929U true CN202231929U (en) | 2012-05-23 |
Family
ID=46082498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203923176U Expired - Fee Related CN202231929U (en) | 2011-10-17 | 2011-10-17 | LED over-temperature protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231929U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051557A (en) * | 2016-08-04 | 2016-10-26 | 深圳市艾格斯特科技有限公司 | High-power floodlight |
-
2011
- 2011-10-17 CN CN2011203923176U patent/CN202231929U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106051557A (en) * | 2016-08-04 | 2016-10-26 | 深圳市艾格斯特科技有限公司 | High-power floodlight |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20141017 |
|
| EXPY | Termination of patent right or utility model |