CN204721665U - Realize the LED drive circuit of low-temperature coefficient - Google Patents
Realize the LED drive circuit of low-temperature coefficient Download PDFInfo
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- CN204721665U CN204721665U CN201520372804.4U CN201520372804U CN204721665U CN 204721665 U CN204721665 U CN 204721665U CN 201520372804 U CN201520372804 U CN 201520372804U CN 204721665 U CN204721665 U CN 204721665U
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- npn pipe
- resistance
- base stage
- connects
- emitter
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Abstract
The utility model discloses a kind of LED drive circuit realizing low-temperature coefficient.The LED drive circuit realizing low-temperature coefficient comprises the first resistance, a NPN pipe, the 2nd NPN pipe, the 3rd NPN pipe, the second resistance R1 and the 3rd resistance R2.
Description
Technical field
The utility model relates to LED drive circuit, refers more particularly to the LED drive circuit realizing low-temperature coefficient.
Background technology
LED drive current variation with temperature is less, and the stability of drive circuit is higher.
Summary of the invention
The utility model aims to provide a kind of LED drive circuit realizing low-temperature coefficient.
Realize the LED drive circuit of low-temperature coefficient, comprise the first resistance, a NPN pipe, the 2nd NPN pipe, the 3rd NPN pipe, the second resistance R1 and the 3rd resistance R2:
One termination supply voltage VCC of described first resistance, the collector electrode of a NPN pipe described in another termination and the base stage of described 2nd NPN pipe;
The base stage of a described NPN pipe connects the emitter of described 2nd NPN pipe and the base stage of described 3rd NPN pipe, and collector electrode connects one end of described first resistance and the base stage of described 2nd NPN pipe, grounded emitter;
The base stage of described 2nd NPN pipe connects one end of described first resistance and the collector electrode of a described NPN pipe 2, and collector electrode meets supply voltage VCC, and emitter connects the base stage of a described NPN pipe and the base stage of described 3rd NPN pipe;
The base stage of described 3rd NPN pipe connects the base stage of a described NPN pipe and the emitter of described 2nd NPN pipe, and collector electrode connects LED, and emitter connects one end of described second resistance R1;
The emitter of the 3rd NPN pipe described in one termination of described second resistance R1, one end of the 3rd resistance R2 described in another termination;
One end of second resistance R1 described in one termination of described 3rd resistance R2, other end ground connection.
Supply voltage VCC is added in the base stage of a described NPN pipe by the emitter of described first resistance and described 2nd NPN pipe, a described NPN pipe conducting, electric current equals the resistance value of BE junction voltage divided by described first resistance that supply voltage deducts a described NPN pipe, this electric current is given on described 3rd NPN pipe by a described NPN pipe mirror image, the size of a described NPN pipe and described 3rd NPN pipe can be set, reach arrange described one NPN pipe different with the BE junction voltage of described 3rd NPN pipe, the difference of the voltage of these two BE junction voltages is added on described second resistance R1 and described 3rd resistance R2, driving LED lamp on the collector electrode that the electric current produced with this flows to described 3rd NPN pipe, , the electric current of driving LED lamp can regulate by regulating the resistance value sum of described second resistance R1 and described 3rd resistance R2, described 2nd NPN pipe is improved a described NPN pipe mirror image to the mirror image precision of described 3rd NPN pipe, described second resistance R1 can adopt base BASE resistance to have positive temperature coefficient, and described 3rd resistance R3 can adopt polycrystalline POLY resistance to have negative temperature coefficient, is reached the electric current of the driving LED of low-temperature coefficient by the temperature coefficient arranging these two resistance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram realizing the LED drive circuit of low-temperature coefficient of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
Realize the LED drive circuit of low-temperature coefficient, as shown in Figure 1, comprise the first resistance 101, a NPN pipe 102, the 2nd NPN pipe 103, the 3rd NPN pipe 104, second resistance R1 and the 3rd resistance R2:
One termination supply voltage VCC of described first resistance 101, the collector electrode of a NPN pipe 102 described in another termination and the base stage of described 2nd NPN pipe 103;
The base stage of a described NPN pipe 102 connects the emitter of described 2nd NPN pipe 103 and the base stage of described 3rd NPN pipe 104, and collector electrode connects one end of described first resistance 101 and the base stage of described 2nd NPN pipe 103, grounded emitter;
The base stage of described 2nd NPN pipe 103 connects one end of described first resistance 101 and the current collection of a described NPN pipe 102
Pole, collector electrode meets supply voltage VCC, and emitter connects the base stage of a described NPN pipe 102 and the base stage of described 3rd NPN pipe 104;
The base stage of described 3rd NPN pipe 104 connects the base stage of a described NPN pipe 102 and the emitter of described 2nd NPN pipe 103, and collector electrode connects LED 106, and emitter connects one end of described second resistance R1;
The emitter of the 3rd NPN pipe 104 described in one termination of described second resistance R1, one end of the 3rd resistance R2 described in another termination;
One end of second resistance R1 described in one termination of described 3rd resistance R2, other end ground connection.
Supply voltage VCC is added in the base stage of a described NPN pipe 102 by the emitter of described first resistance 101 and described 2nd NPN pipe 103, described NPN pipe 102 conducting, electric current equals the resistance value of BE junction voltage divided by described first resistance 101 that supply voltage deducts a described NPN pipe 102, this electric current is given on described 3rd NPN pipe 104 by described NPN pipe 102 mirror image, the size of a described NPN pipe 102 and described 3rd NPN pipe 104 can be set, reach that to arrange a described NPN pipe 102 different with the BE junction voltage of described 3rd NPN pipe 104, the difference of the voltage of these two BE junction voltages is added on described second resistance R1 and described 3rd resistance R2, driving LED lamp 106 on the collector electrode that the electric current produced with this flows to described 3rd NPN pipe 104, , the electric current of driving LED lamp can regulate by regulating the resistance value sum of described second resistance R1 and described 3rd resistance R2, described 2nd NPN pipe 103 is improved described NPN pipe 102 mirror image to the mirror image precision of described 3rd NPN pipe 104, described second resistance R1 can adopt base BASE resistance to have positive temperature coefficient, and described 3rd resistance R3 can adopt polycrystalline POLY resistance to have negative temperature coefficient, is reached the electric current of the driving LED of low-temperature coefficient by the temperature coefficient arranging these two resistance.
Claims (1)
1. realize the LED drive circuit of low-temperature coefficient, it is characterized in that: comprise the first resistance, a NPN pipe, the 2nd NPN pipe, the 3rd NPN pipe, the second resistance R1 and the 3rd resistance R2;
One termination supply voltage VCC of described first resistance, the collector electrode of a NPN pipe described in another termination and the base stage of described 2nd NPN pipe;
The base stage of a described NPN pipe connects the emitter of described 2nd NPN pipe and the base stage of described 3rd NPN pipe, and collector electrode connects one end of described first resistance and the base stage of described 2nd NPN pipe, grounded emitter;
The base stage of described 2nd NPN pipe connects one end of described first resistance and the collector electrode of a described NPN pipe 2, and collector electrode meets supply voltage VCC, and emitter connects the base stage of a described NPN pipe and the base stage of described 3rd NPN pipe;
The base stage of described 3rd NPN pipe connects the base stage of a described NPN pipe and the emitter of described 2nd NPN pipe, and collector electrode connects LED, and emitter connects one end of described second resistance R1;
The emitter of the 3rd NPN pipe described in one termination of described second resistance R1, one end of the 3rd resistance R2 described in another termination;
One end of second resistance R1 described in one termination of described 3rd resistance R2, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372804.4U CN204721665U (en) | 2015-06-01 | 2015-06-01 | Realize the LED drive circuit of low-temperature coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372804.4U CN204721665U (en) | 2015-06-01 | 2015-06-01 | Realize the LED drive circuit of low-temperature coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204721665U true CN204721665U (en) | 2015-10-21 |
Family
ID=54320621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520372804.4U Expired - Fee Related CN204721665U (en) | 2015-06-01 | 2015-06-01 | Realize the LED drive circuit of low-temperature coefficient |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204721665U (en) |
-
2015
- 2015-06-01 CN CN201520372804.4U patent/CN204721665U/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: 20151021 Termination date: 20160601 |