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led dimming drive circuit

A technology of dimming driving and driving current, applied in the field of LED dimming, can solve complex problems, achieve the effect of solving the problem of dimming range, high conversion efficiency and simple structure

Active Publication Date: 2017-12-12
BEIJING BOE ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a LED dimming drive circuit to overcome the problem of using a complex circuit structure to adjust the AC voltage from the TRIAC dimmer in the prior art.

Method used

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Experimental program
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specific Embodiment approach

[0102] According to a specific implementation manner, the first passive discharge circuit 24 includes an RC circuit composed of an input resistor RI and an input capacitor CI.

[0103] The specific working process of the first passive bleeder circuit is as follows: when the TRIAC dimmer 1 is turned off, the voltage across the input capacitor CI is 0, so when the TRIAC dimmer 1 is turned on, the first passive bleeder The instantaneous peak current generated by the discharge circuit 24 is the voltage when the TRIAC dimmer 1 is triggered divided by the resistance value of the input resistor RI. In terms of the dimming performance of the entire circuit, the larger the capacitance value of the input capacitor CI, the better the dimming effect. However, when the capacitance value of the input capacitor CI is too large, the adjustable range of the circuit will be narrowed, so a compromise needs to be considered. The input resistance RI is mainly to control the peak value of the trig...

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Abstract

The invention provides an LED (light emitting diode) dimming driving circuit. The LED dimming drive circuit includes: a TRIAC (triac) dimmer for adjusting the input AC voltage; an RCC (self-excited oscillation pulse converter) connected to the TRIAC dimmer for adjusting The AC voltage from the TRIAC dimmer provides drive current for the LED load. The present invention adopts RCC to carry out LED dimming. Since RCC is a self-excited topology drive, compared with the general separately excited circuit, the circuit structure of the present invention is simple, the conversion efficiency is high, and the cost is low, and because the RCC itself The control characteristics make it possible to convert the change of the input voltage after passing through the TRIAC dimmer almost linearly into the change of the output current. The starting voltage required by RCC is generally very low, so that even when the input AC voltage is small, The RCC also works fine, which solves the dimming range issue.

Description

technical field [0001] The present invention relates to the field of LED (Light-emitting Diode, light-emitting diode) dimming, in particular to an LED dimming drive circuit. Background technique [0002] A TRIAC (Tridirectional Thyristor) dimmer can be realized in structure only by a TRIAC thyristor. Compared with other types of dimmers, it has a simple structure, low cost, and a wide range of applications in the market. [0003] When LED lighting replaces incandescent lamps to become a new generation of lighting solutions, peripheral circuits that are compatible with TRIAC dimming are required. [0004] However, the peripheral circuits suitable for TRIAC dimming are complex in structure. In addition, there are problems in dimming performance such as low conversion efficiency, poor linearity of dimming, narrow dimming range, and flicker. Contents of the invention [0005] The main purpose of the present invention is to provide an LED dimming drive circuit to overcome the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/10H05B45/315H05B45/3725
Inventor 谢玮
Owner BEIJING BOE ENERGY TECH