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led dimming drive circuit

A technology of dimming driving and driving current, applied in the field of power electronics, can solve the problem of difficult to maintain the holding current and maintaining current of the thyristor, and achieve the effect of eliminating stroboscopic and keeping the brightness unchanged.

Active Publication Date: 2017-08-25
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the above prior art, the constant current i L It can only drive the load. If the LED drive control circuit of the prior art is applied to the thyristor dimming system, the constant current i L Difficulty maintaining the latching and holding currents required to turn on the SCR thyristor

Method used

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Embodiment Construction

[0025] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0026] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0027] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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PUM

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Abstract

The invention discloses an LED dimming driving circuit. The invention adds a current distribution circuit. Under the constant current driving of the LED load, the size of the total input current is changed, and according to the corresponding working time of half a power frequency cycle, Adjust the size of the total input current, so as to maintain the latching current and maintenance current required for the conduction of the thyristor thyristor; due to the inconsistent characteristics of the positive and negative half cycles, the conduction angle corresponding to the positive and negative half cycles is adjusted by the present invention The signal is adjusted to be consistent, which eliminates the stroboscopic problem caused by the inconsistency of the positive and negative half cycles; according to the conduction angle signal, the output current of the driving current generation circuit is adjusted accordingly, which can be applied to different thyristors, so as to maintain the LED load The brightness remains unchanged.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an LED dimming drive circuit. Background technique [0002] For the field of LED lighting, ordinary AC mains is used as the input power supply, and the AC input power supply passes through a rectification circuit to obtain a DC voltage, and the DC voltage is converted to generate a constant current to supply power to the LED load. [0003] Such as figure 1 As shown, the LED drive control circuit in the prior art is illustrated, including the AC input power supply V in , a rectifier circuit and a drive current generation circuit, the rectifier circuit receives an AC input power supply V in , rectifier circuit for AC input power V in rectified to obtain a DC voltage V g , the driving current generation circuit receives the DC voltage V g , to get the output voltage V o To supply power to the LED load and generate a constant current i L , to drive the LED load. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/10H05B45/48
Inventor 王兆丰
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD