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Dimming circuit, dimming method and LED control circuit using the same

A technology of dimming circuit and control circuit, applied in the field of electronics, can solve the problem of inflexible control mode of dimming circuit, and achieve the effect of not easy external interference and flexible control mode

Pending Publication Date: 2018-12-18
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a dimming circuit and dimming method with flexible control mode and LED control circuit using it, which is used to solve the problem that the control mode of the existing dimming circuit is not flexible

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  • Dimming circuit, dimming method and LED control circuit using the same
  • Dimming circuit, dimming method and LED control circuit using the same
  • Dimming circuit, dimming method and LED control circuit using the same

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Embodiment Construction

[0034] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0035] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, without which the description of these details can be fully understood by those skilled in the art.

[0036] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in a simplified form and use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present in...

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Abstract

The invention provides a dimming circuit and a dimming method and an LED control circuit using the same, according to the received dimming signal and the average signal characterizing the average value of the inductor current, obtaining a first reference voltage, adjusting a delay time and a second reference voltage according to the first reference voltage, wherein the delay time is the time fromthe off of the auxiliary switch tube to the on of the main switch tube, and the second reference voltage is used as an inductor current reference signal; The dimming circuit has one dimming mode, or acombination of two dimming modes, or a combination of three dimming modes. The invention adopts closed-loop control, the control mode is flexible, and is not easy to be disturbed by the outside.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a dimming circuit, a dimming method and an LED control circuit using the same. Background technique [0002] In the prior art, there are generally three dimming modes: PWM dimming, analog dimming and hybrid dimming. The schematic diagram of the prior art dimming circuit is as follows: figure 1 As shown, the dimming circuit obtains the first reference voltage Vcom according to the PWM signal, and the larger the pulse width of the PWM signal is, the larger the first reference voltage Vcom is. The dimming circuit obtains a second reference voltage VREF and a delay time Tdelay according to the magnitude of the first reference voltage Vcom, the second reference voltage VREF is used as a peak value reference signal of the inductor current, and the delay time Tdelay represents the time taken for the inductor current to be zero. When the first reference voltage Vcom is less than the...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 孙明波任远程周逊伟
Owner JOULWATT TECH INC LTD