CN204305415U - A kind of LED thermal-shutdown circuit - Google Patents
A kind of LED thermal-shutdown circuit Download PDFInfo
- Publication number
- CN204305415U CN204305415U CN201420776103.2U CN201420776103U CN204305415U CN 204305415 U CN204305415 U CN 204305415U CN 201420776103 U CN201420776103 U CN 201420776103U CN 204305415 U CN204305415 U CN 204305415U
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- China
- Prior art keywords
- led
- branch road
- control chip
- shutdown circuit
- current control
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of LED thermal-shutdown circuit, comprise Current Control chip, and the LED be connected with described Current Control chip respectively and temperature-sensitive protect branch road.LED thermal-shutdown circuit described in the utility model, can overcome fragile in prior art, service life is short and high in cost of production defect, to realize not fragile, long service life and the low advantage of cost.
Description
Technical field
The utility model relates to LED technology field, particularly, relates to a kind of LED thermal-shutdown circuit.
Background technology
When using LED to do light source, what perplex user most is the heat that it produces.Under normal use conditions, the height that the size flowing through LED current produces temperature to LED is expected.But when the system failure occurs, the temperature of LED exception may occur, too high temperature can make the brightness of LED produce decay even can damage LED, and therefore the over-temperature protection circuit of LED is necessary.
Realizing in process of the present utility model, inventor find at least to exist in prior art fragile, service life is short and high in cost of production defect.
Utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of LED thermal-shutdown circuit, to realize not fragile, long service life and the low advantage of cost.
For achieving the above object, the technical solution adopted in the utility model is: a kind of LED thermal-shutdown circuit, comprises Current Control chip, and the LED be connected with described Current Control chip respectively and temperature-sensitive protect branch road.
Further, described temperature-sensitive protection branch road, comprises the dc source VCC, first is connected with described Current Control chip respectively and protects branch road and second to protect branch road, and is connected to described first and protects branch road and second to protect diode between branch road.
Further, described first protection branch road, comprise and be connected to negative tempperature coefficient thermistor R1 between dc source VCC and ground and resistance R2 in turn, thermistor R1 is connected with the negative electrode of diode with the common port of resistance R2.
Further, described second protection branch road, comprise and be connected to resistance R3 between dc source VCC and ground and resistance R4 in turn, resistance R3 is connected with the anode of diode with the common port of resistance R4.
Further, comprise the LED be connected between described Current Control chip and dc source VD, the anode of described LED is connected with Current Control chip.
The LED thermal-shutdown circuit of each embodiment of the utility model, owing to comprising Current Control chip, and the LED be connected with Current Control chip respectively and temperature-sensitive protect branch road; Thus the defect fragile in prior art, service life is short and cost is high can be overcome, to realize not fragile, long service life and the low advantage of cost.
Other features and advantages of the utility model will be set forth in the following description, and, partly become apparent from description, or understand by implementing the utility model.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for description, is used from explanation the utility model, does not form restriction of the present utility model with embodiment one of the present utility model.In the accompanying drawings:
Fig. 1 is the operation principle schematic diagram of the utility model LED thermal-shutdown circuit.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the utility model, and be not used in restriction the utility model.
According to the utility model embodiment, as shown in Figure 1, a kind of LED thermal-shutdown circuit is provided.
The LED thermal-shutdown circuit of the present embodiment, comprises Current Control chip, and is connected LED branch road with Current Control chip respectively and temperature-sensitive protects branch road.
In the above-described embodiments, temperature-sensitive protection branch road, comprises the dc source VCC, first be connected with Current Control chip respectively and protects branch road and second to protect branch road, and is connected to the first protection branch road and second and protects diode between branch road.First protection branch road, comprise and be connected to thermistor R1 between dc source VCC and ground and resistance R2 in turn, thermistor R1 is connected with the negative electrode of diode with the common port of resistance R2.Second protection branch road, comprise and be connected to resistance R3 between dc source VCC and ground and resistance R4 in turn, resistance R3 is connected with the anode of diode with the common port of resistance R4.
In the above-described embodiments, also comprise the LED be connected between Current Control chip and dc source VD, the anode of LED is connected with Current Control chip.
The technical solution of the utility model, primarily of Current Control chip, LED, diode, resistance and thermistor composition, its operation principle is: R4 is the thermistor with negative temperature coefficient, and R4 is for detecting the temperature of LED.U1 is the voltage on resistance R3, and U2 is the voltage on resistance R2.When LED temperature raises, R4 resistance can reduce, U1 increase as U1>U2 Current Control chip will restricted passage LED electric current thus LED temperature is reduced, play a protective role.
The technical solution of the utility model, at least can reach following beneficial effect:
(1) before excess temperature, LED current keeps stable; after temperature exceedes setting value; because have the restriction of thermal-shutdown circuit so the electric current through LED can decline, thus the temperature of LED is declined, balance will be reached through the temperature of LED after a period of time and almost no longer rise.
(2), within LED thermal-shutdown circuit can enable the brightness of LED stable working state LED maintain normal range (NR), ensure that the normal use of LED, thus substantially prolongs the service life of LED, there is obvious economic benefit.
Last it is noted that the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although be described in detail the utility model with reference to previous embodiment, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. a LED thermal-shutdown circuit, is characterized in that, comprises Current Control chip, and the LED be connected with described Current Control chip respectively and temperature-sensitive protect branch road.
2. LED thermal-shutdown circuit according to claim 1; it is characterized in that; described temperature-sensitive protection branch road; comprising the dc source VCC, first be connected with described Current Control chip respectively protects branch road and second to protect branch road, and is connected to described first protection branch road and second and protects diode between branch road.
3. LED thermal-shutdown circuit according to claim 2; it is characterized in that; described first protection branch road, comprise and be connected to negative tempperature coefficient thermistor R1 between dc source VCC and ground and resistance R2 in turn, thermistor R1 is connected with the negative electrode of diode with the common port of resistance R2.
4. LED thermal-shutdown circuit according to claim 2, is characterized in that, described second protection branch road, comprise and be connected to resistance R3 between dc source VCC and ground and resistance R4 in turn, resistance R3 is connected with the anode of diode with the common port of resistance R4.
5. the LED thermal-shutdown circuit according to any one of claim 1-4; it is characterized in that; also comprise the LED be connected between described Current Control chip and dc source VD, the anode of described LED is connected with Current Control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420776103.2U CN204305415U (en) | 2014-12-11 | 2014-12-11 | A kind of LED thermal-shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420776103.2U CN204305415U (en) | 2014-12-11 | 2014-12-11 | A kind of LED thermal-shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204305415U true CN204305415U (en) | 2015-04-29 |
Family
ID=53110916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420776103.2U Expired - Fee Related CN204305415U (en) | 2014-12-11 | 2014-12-11 | A kind of LED thermal-shutdown circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204305415U (en) |
-
2014
- 2014-12-11 CN CN201420776103.2U patent/CN204305415U/en not_active Expired - Fee Related
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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: 20150429 Termination date: 20211211 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |