CN207460562U - A kind of constant current driver circuit for LED based on triode - Google Patents
A kind of constant current driver circuit for LED based on triode Download PDFInfo
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- CN207460562U CN207460562U CN201721652138.5U CN201721652138U CN207460562U CN 207460562 U CN207460562 U CN 207460562U CN 201721652138 U CN201721652138 U CN 201721652138U CN 207460562 U CN207460562 U CN 207460562U
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- triode
- resistance
- led
- constant current
- driver circuit
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Abstract
The utility model discloses a kind of constant current driver circuit for LED based on triode, including triode Q1, triode Q2, diode D1 and resistance R1, the anode connection of the diode D2+12V DC electricity, the cathode connection resistance R1 and LED light string of diode D1, the other end connection resistance R2 of resistance R1, the base stage of triode Q1 and the collector of triode Q2, the emitter connection resistance R2 of triode Q2, resistance R3 and ground, constant current driver circuit for LED of the utility model based on triode uses linear circuit, no EMI interference, it is and of low cost, system stability is high, therefore it is very suitable for the batch production of automobile LED driving.
Description
Technical field
The utility model is related to a kind of driving circuits, are specifically a kind of constant current driver circuit for LED based on triode.
Background technology
In recent years, since great power LED is gradually applied to car headlamp, fog lamp, daytime running lights etc., to improve efficiency,
LED is light emitting diode, and characteristic is when very little variation occurs for its both end voltage, and very big change can occur for electric current
Change, to avoid LED, electric current is excessive to be burnt out because flowing through, therefore frequently with constant current driving when LED is lighted.
Utility model content
The purpose of this utility model is to provide a kind of constant current driver circuit for LED based on triode, to solve the above-mentioned back of the body
The problem of being proposed in scape technology.
To achieve the above object, the utility model provides following technical solution：
A kind of constant current driver circuit for LED based on triode, including triode Q1, triode Q2, diode D1 and resistance
The anode connection of R1, the diode D2+12V DC electricity, the cathode connection resistance R1 and LED light string of diode D1, resistance R1
Other end connection resistance R2, the base stage of triode Q1 and the collector of triode Q2, the emitter connection resistance of triode Q2
R2, resistance R3 and ground, the emitter of base stage connecting triode Q1 of triode Q2 and the other end of resistance R3, the collection of triode Q1
Electrode connects the other end of LED light string.
Preferred embodiment as the utility model：The LED light string is composed in series by multiple light emitting diodes.
Compared with prior art, the beneficial effects of the utility model are：LED constant current of the utility model based on triode is driven
Dynamic circuit is very suitable for automobile LED drive using linear circuit, no EMI interference, and of low cost, system stability height
Dynamic batch production.
Description of the drawings
Fig. 1 is the circuit diagram of constant current driver circuit for LED of the utility model based on triode.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
Referring to Fig. 1, in the utility model embodiment, a kind of constant current driver circuit for LED based on triode, including three poles
Pipe Q1, triode Q2, anode connection+12V DC electricity of diode D1 and resistance R1, the diode D2, the moon of diode D1
Pole connects resistance R1 and LED light string, other end connection resistance R2, the base stage of triode Q1 and the current collection of triode Q2 of resistance R1
Pole, emitter connection resistance R2, resistance R3 and the ground of triode Q2, the emitter of the base stage connecting triode Q1 of triode Q2 and
The other end of resistance R3, the other end of the collector connection LED light string of triode Q1.
LED light string is composed in series by multiple light emitting diodes.
The operation principle of the utility model is：The design is a fixed value (same model using triode Q2be section voltages
Triode), it is assumed that the electric current that make to flow through LED is steady state value I, then this mesh can be realized by adjusting the resistance value of R3
's.By Ohm's law I=U/R, the electric current for flowing through LED is I=Ube/R3；Since Ube is a fixed value, then as long as adjustment R3
Resistance value, the electric current I for flowing through LED is definite value.
The design is very suitable for due to using linear circuit, no EMI interference, and simultaneous of low cost, system stability height
In the batch production of automobile LED driving.
Claims (2)
1. a kind of constant current driver circuit for LED based on triode, including triode Q1, triode Q2, diode D1 and resistance R1,
It is characterized in that, the anode connection of the diode D2+12V DC electricity, the cathode connection resistance R1 and LED light of diode D1
String, other end connection resistance R2, the base stage of triode Q1 and the collector of triode Q2 of resistance R1, the emitter of triode Q2
Connect resistance R2, resistance R3 and ground, the emitter of base stage connecting triode Q1 of triode Q2 and the other end of resistance R3, three poles
The other end of the collector connection LED light string of pipe Q1.
2. the constant current driver circuit for LED according to claim 1 based on triode, which is characterized in that the LED light string is
It is composed in series by multiple light emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721652138.5U CN207460562U (en) | 2017-12-01 | 2017-12-01 | A kind of constant current driver circuit for LED based on triode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721652138.5U CN207460562U (en) | 2017-12-01 | 2017-12-01 | A kind of constant current driver circuit for LED based on triode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207460562U true CN207460562U (en) | 2018-06-05 |
Family
ID=62275565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721652138.5U Active CN207460562U (en) | 2017-12-01 | 2017-12-01 | A kind of constant current driver circuit for LED based on triode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207460562U (en) |
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2017
- 2017-12-01 CN CN201721652138.5U patent/CN207460562U/en active Active
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