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LED driving circuit having TRIAC dimmer, circuit module and control method

A LED drive and circuit module technology, applied in the field of power electronics, can solve the problems of flickering light source, unclear input voltage state, asymmetrical LED drive circuit waveform, etc., to achieve the effect of improving compatibility and prolonging the conduction time

Active Publication Date: 2019-08-09
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
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Problems solved by technology

[0004] When the conduction phase angle of the thyristor dimmer is small, the input voltage of the LED drive circuit will have an asymmetric waveform after the thyristor dimmer is turned off, which will easily cause the state of the input voltage to be unclear, which will cause the light source to flicker. Thus affecting the compatibility of TRIAC dimmers

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  • LED driving circuit having TRIAC dimmer, circuit module and control method
  • LED driving circuit having TRIAC dimmer, circuit module and control method
  • LED driving circuit having TRIAC dimmer, circuit module and control method

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Embodiment Construction

[0047] 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.

[0048] 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.

[0049] 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

The invention discloses a circuit module and a control method. A bleeder circuit is turned on to generate the bleeder current after a TRIAC dimmer is turned on and when the on-state phase angle of theTRIAC dimmer is less than a certain phase angle threshold. The bleeder current can be used for extending the on-time of the TRIAC dimmer, thereby avoiding the asymmetry of a DC bus voltage waveform and the resulting light source flickering when the TRIAC dimmer is adjusted to a small angle, and further achieving system compatibility.

Description

technical field [0001] The present invention relates to power electronics technology, and more specifically, relates to an LED driving circuit with a thyristor dimmer, a circuit module and a control method. Background technique [0002] Thyristor dimmer 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 every half cycle of the sine wave to obtain the same conduction phase angle. By adjusting the chopping phase of the thyristor dimmer, the conduction phase angle can be changed to realize dimming. [0003] For the LED lighting system with a TRIAC dimmer, due to the characteristics of the TRIAC dimmer, a certain amount of holding current is required when the TRIAC is turned on, so that it can maintain a reliable conduction state. Therefore, LED drive circuits suitable for silicon controlled rectifier dimmers usually have corresponding discharge ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/3575H05B45/31H05B45/10H05B45/395H05B45/14
Inventor 陈惠强王志硕王建新
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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