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White light LED circuit and method for controlling average current of white light LED

A LED circuit and average current technology, which is applied in circuit layout, electroluminescent light source, lamp circuit layout, etc., can solve the problems of increasing power loss and achieve the effect of increasing power loss and improving control accuracy

Active Publication Date: 2010-02-17
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This current control method has high precision, but the sampling resistor connected in series increases additional power loss

Method used

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  • White light LED circuit and method for controlling average current of white light LED
  • White light LED circuit and method for controlling average current of white light LED
  • White light LED circuit and method for controlling average current of white light LED

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Embodiment Construction

[0039] Such as figure 2 Shown is a circuit 100 for controlling the average current of a white light LED with high precision according to the present invention. Such as figure 2 As shown, the circuit 100 consists of an input V IN , main switching tube S 0 , a freewheeling diode D, an inductor L, and a typical buck circuit composed of a white LED, that is, the white LED is first connected in series with the inductor L and then connected in parallel with the freewheeling diode D, and then connected in parallel with the main switch S 0 connected in series across the input. The circuit 100 further includes a sampling circuit 10, a compensation circuit 20, a modulation circuit M and a driving circuit U D . The input terminal of the sampling circuit is connected to the main switch tube S 0 The upper end of which the output signal is delivered to one input end of the compensation circuit 20; the other input end of the compensation circuit 20 receives the reference signal I re...

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PUM

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Abstract

The invention provides a white light LED circuit and a method for precisely controlling the average current of the white light LED. The circuit and / or the method sample(s) the current of a main switching pipe, and the average current which passes through the main switching pipe is regulated and controlled by a PWM method or a constant switching time modulation method by adopting a midpoint current sampling method or a full wave current sampling method through a subsequent compensating circuit, a modulation circuit and a driving circuit so as to control the average current passing through the white light LED with high precision. The invention has the advantages of low loss, high precision, and the like.

Description

technical field [0001] The present invention relates to an electronic circuit, and more specifically, the present invention relates to a white light LED circuit in the electronic circuit and a method for accurately controlling the average current flowing through the white light LED. Background technique [0002] Due to its many advantages such as no pollution, long life, vibration resistance and impact resistance, white light LED has attracted much attention in the lighting field and has been applied to a certain extent. [0003] Such as figure 1 The circuit shown is a typical application of white LED in buck circuit. When switch S 1 is turned on, switch S 2 is shut down, the input V IN , inductor L, white LED, switch S 1 A current loop is formed, and the current of the inductor L and the white LED increases; when the switch S 1 is turned off, switch S 2 When turned on, inductor L, white LED, switch S 2 A current loop is formed, and the current of the inductor L and ...

Claims

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Application Information

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IPC IPC(8): H05B37/00H05B37/02F21V23/00F21Y101/02
CPCH05B33/0818H05B45/375
Inventor 任远程杜磊黄勇
Owner CHENGDU MONOLITHIC POWER SYST