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LED drive circuit with thyristor dimmer and control method thereof

An LED driver and dimmer technology, applied in the field of power electronics, can solve the problems of low efficiency and large LED circuit loss, and achieve the effect of reducing loss and improving efficiency

Active Publication Date: 2020-03-06
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the conduction of the thyristor dimmer is maintained by discharging the bus current or keeping the LED load at a relatively large constant current, which results in greater loss of the LED circuit and lower efficiency

Method used

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  • LED drive circuit with thyristor dimmer and control method thereof
  • LED drive circuit with thyristor dimmer and control method thereof
  • LED drive circuit with thyristor dimmer and control method thereof

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Embodiment Construction

[0045] 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.

[0046] 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.

[0047] 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 and a control method thereof. By setting a supplementary current generation circuit on the current path of the LED load, the LED drive circuit can be adjusted at the dimming angle of the thyristor dimmer. When it is small, it ensures that the input current meets the conduction requirement of the thyristor dimmer, reduces the loss of the LED driving circuit, and improves the efficiency of the LED driving circuit.

Description

technical field [0001] The present invention relates to power electronics technology, and more specifically, relates to an LED drive circuit with a thyristor dimmer and a control method thereof. Background technique [0002] Thyristor dimmers are currently commonly used dimming devices. 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] The thyristor dimmer uses Triode for Alternating Current (TRIAC), and its working characteristics are: when the gate of TRIAC is triggered to make the element turn from off to on, the TRIAC is maintained. The conduction requires a minimum current, which may be referred to as a latching current (Latching Current, or latching current). After the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/345H05B44/00
CPCH05B45/37H05B45/3575H05B45/10H05B45/395Y02B20/30
Inventor 陈惠强王志硕王建新
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD