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LED driving module

A technology for driving modules and ports, applied in the direction of electrical components, etc., can solve problems such as howling easily

Active Publication Date: 2020-08-14
深圳深爱半导体股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, in view of the above-mentioned technical problem that howling is easy to occur when the pulse frequency of PWM dimming is too high, this application proposes an LED driver module

Method used

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Embodiment Construction

[0048] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] In thi...

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Abstract

The invention relates to an LED driving module. The LED driving module comprises a PWM detection circuit which is used for detecting and outputting a PWM dimming signal; a linear dimming circuit whichis used for controlling the sampling voltage to be reduced along with the reduction of the duty ratio of the PWM dimming signal according to the PWM dimming signal; a PWM processing circuit which isused for outputting a first level when the duty ratio of the PWM dimming signal exceeds a set value, and outputting a second level when the duty ratio of the PWM dimming signal does not exceed the setvalue; and a selection circuit which is used for inputting the PWM dimming signal into the control end of the switching tube for PWM dimming when the PWM processing circuit outputs the first level, and starting the linear dimming circuit for linear dimming when the PWM processing circuit outputs the second level. By combining PWM dimming with linear dimming, the problems of stroboflash and dimming depth in PWM dimming can be solved to the maximum extent, and the LED dimming effect is optimized.

Description

technical field [0001] The invention relates to the field of LEDs, in particular to an LED driving module. Background technique [0002] LED lighting is widely used because of its many advantages such as environmental protection, saving, and high luminous efficiency. In actual work, there are two ways to adjust the light and shade of LEDs, the first is PWM (Pulse Width Modulation, pulse width modulation) dimming, and the second is linear dimming. Among them, PWM dimming belongs to digital dimming, which has high dimming precision and large dimming range. When using PWM dimming, if the frequency is too low (less than 100Hz), there will be flicker visible to the naked eye, and if the frequency is too high (200Hz~20KHz), there will be howling within the range of human ears. If sampling linear dimming, although there will be no flickering, howling, etc., the linear dimming range is narrow and the dimming is not flexible enough. Contents of the invention [0003] Based on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/10H05B45/325
CPCH05B45/10H05B45/325
Inventor 蔡业信杨正友黄沛胜
Owner 深圳深爱半导体股份有限公司
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