LED driving circuit with thyristor dimmer, circuit module and control method

A LED drive and circuit module technology, applied in the field of power electronics, can solve problems such as incompatibility between the conduction position and the circuit, LED load flicker, leakage current change, etc., and achieve the effect of avoiding LED flicker

Active Publication Date: 2018-01-16
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] On the other hand, the thyristor dimmer will have a leakage current before it is turned on. The magnitude of the leakage current is related to the model of the thyristor dimmer and the parameter settings of the LED drive circuit. Different circuit settings and different models can TRIAC dimmers cause variations in leakage current, which in turn causes variations in conduction angle
This uncertainty will lead to the incompatibility of the conduction position and the circuit setting, resulting in the problem of flickering of the LED load

Method used

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  • LED driving circuit with thyristor dimmer, circuit module and control method
  • LED driving circuit with thyristor dimmer, circuit module and control method
  • LED driving circuit with thyristor dimmer, circuit module and control method

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Embodiment Construction

[0069] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0070] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0071] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

Disclosed is an LED drive circuit with a thyristor dimmer, a circuit module and a control method. Before the thyristor dimmer is turned on, the DC bus voltage is controlled to change in a predetermined manner through a discharge circuit, avoiding different types of Different thyristor dimmers and different circuit settings lead to inconsistent leakage currents that affect the conduction point of the thyristor dimmer, thereby avoiding the problem of LED flickering. At the same time, through the control of the DC bus voltage, the voltage after the thyristor dimmer is turned on can be affected, so that the turn-on point voltage can be flexibly set as required.

Description

technical field [0001] The invention relates to power electronics technology, in particular to an LED driving circuit with a thyristor dimmer, a circuit module and a control method. Background technique [0002] Thyristor dimming is a commonly used dimming method at present. The thyristor dimmer adopts the phase control method to realize dimming, that is, the conduction of the thyristor dimmer is controlled in every half cycle of the sine wave, and the same conduction phase angle is obtained. By adjusting the chopping phase of the thyristor dimmer, the conduction phase angle can be changed to realize dimming. [0003] SCR dimmers are usually used to dim incandescent lamps. With the popularity of LED light sources, more and more LED drive circuits use SCR dimmers as dimming means. [0004] In the prior art, TRIAC dimmers are usually used in combination with a linear constant current control scheme. The linear constant current control scheme adjusts the current flowing thro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/44H05B45/10H05B45/3725H05B45/3575
Inventor 黄秋凯王建新陈惠强
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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