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Dimming control circuit, method and LED drive circuit using same

A dimming control circuit and LED driving technology, applied in the field of power electronics, can solve the problems of deep dimming depth and difficult to achieve noise, and achieve the effect of reducing noise and improving system efficiency

Active Publication Date: 2020-12-29
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 view of this, the present invention provides a dimming control circuit to solve the existing problems that the existing dimming depth is difficult to achieve and the noise is large

Method used

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  • Dimming control circuit, method and LED drive circuit using same
  • Dimming control circuit, method and LED drive circuit using same
  • Dimming control circuit, method and LED drive circuit using same

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Embodiment Construction

[0044] 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.

[0045] 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.

[0046] 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 dimming control circuit and method. When the PWM dimming signal is at a high level, the power transistor is allowed to work; when the PWM dimming signal is at a low level, the power transistor is prohibited from working after a delay time. And the length of the delay time can be set so that the circuit will not drop to the audio range when the frequency is reduced in the deep dimming application, thereby reducing the noise of the system. At the same time, the system efficiency of the LED driving circuit during deep dimming can also be improved.

Description

technical field [0001] The present invention relates to a power electronic technology, more specifically, to a dimming control circuit and control method applied in an LED drive circuit. Background technique [0002] In LED dimming applications, when the load is light, the conversion efficiency of the power converter in the LED driving circuit will be very low. Therefore, in order to improve the efficiency, in the design of the LED drive circuit, special processing is usually done for the control mode when the dimming depth is deep. [0003] When dimming to 1% or even lower is required, it is difficult to achieve such a low depth by simply reducing the peak current of the inductor. The usual method is to reduce the energy by reducing the operating frequency. However, in this way, frequency reduction may be reduced to audio frequency, especially around 10kHz, the sound is very loud, and it is difficult to meet the noise test standard. Contents of the invention [0004] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325H05B45/345H05B47/165H05B47/16H05B45/30H05B44/00
CPCH05B45/00H02M3/33507H02M7/06H05B45/385Y02B20/30Y02B20/40H02M1/007H05B45/37H05B47/16H05B45/10
Inventor 王龙奇王建新
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD