LED (Light Emitting Diode) constant-current driving circuit

A constant-current drive and circuit technology, applied in electric lamp circuit arrangement, electric light source, lighting device, etc., can solve the problems of many peripheral components, unstable circuit, inconvenient use, etc., to simplify peripheral circuits, reduce application costs, overcome the The effect of decay
CN102685984AInactive Publication Date: 2012-09-19SUZHOU POWERLINK MICROELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU POWERLINK MICROELECTRONICS
Publication Date
2012-09-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an LED (Light Emitting Diode) constant-current driving circuit. The LED constant-current driving circuit comprises a voltage reference unit which is used for generating the reference voltage, a peak current detection keeping unit, an error amplifier unit, a current comparator unit, a demagnetization detection unit and a self-adaptive unit. According to the LED constant-current driving circuit disclosed by the invention, the LED constant-current control can be realized, the service life of an LED can be prolonged, the problem of CTR (Current Transmission Rate) attenuation of an optical coupler is overcome as the circuit is free from an optical coupler device, the stability of the circuit is increased, the EMI (Electro Magnetic Interference) and the harmonic distortion can be greatly improved as the switching frequency of a power switching tube of the circuit is a variable frequency, an external circuit can be greatly simplified by adopting the circuit, and the using cost can be greatly reduced.
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Description

technical field

[0001] The invention relates to the field of integrated circuits, in particular to a constant current circuit suitable for driving a light emitting diode (LED). Background technique

[0002] At present, the use of light-emitting diodes (LEDs) is becoming more and more popular, and users have put forward higher and higher requirements for them. Among them, electrical isolation and constant current control technology are getting more and more attention because they involve safety and LED service life.

[0003] The traditional method of realizing electrical isolation and constant current control is realized by conventional magnetic energy induction feedback or optocoupler feedback. The conventional magnetic energy induction feedback method usually consists of an auxiliary winding and a sampling filter circuit. The voltage on the auxiliary winding will increase with the increase of the output voltage. By sampling this voltage, it will become a DC voltage after ...

Claims

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