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A multi-channel LED dimming circuit

A dimming circuit and dimming technology, applied in the field of power electronics, can solve the problems of unstable current, limited dimming accuracy, and inability to fully realize it, and achieve the effects of suppressing overshoot current, improving dimming accuracy, and avoiding flickering

Active Publication Date: 2019-01-04
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in this method of multi-channel LED dimming control circuit, the dimming accuracy of 0-100% cannot be achieved, the dimming range is limited, and the current will be unstable, causing the LED lights to flicker
In this mode of LED drive circuit with multi-channel dimmable constant current output, its dimming accuracy is limited, and it cannot fully realize 0-100% dimming

Method used

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  • A multi-channel LED dimming circuit
  • A multi-channel LED dimming circuit
  • A multi-channel LED dimming circuit

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Embodiment 1

[0055] See figure 1 , figure 2 , image 3 and Figure 4 , figure 1 A schematic diagram of module connection of a multi-channel LED dimming circuit provided by the present invention; figure 2 A schematic diagram of the circuit structure of a dimming control unit of a multi-channel LED dimming circuit provided by the present invention; image 3 A schematic diagram of the circuit structure of a multi-channel LED dimming circuit provided by the present invention; Figure 4 A circuit waveform diagram of a multi-channel LED dimming circuit provided by the present invention.

[0056] Such as figure 1 As shown, a multi-channel LED dimming circuit includes: a dimming control unit, a feedback control unit, a voltage regulator and an LED channel array; wherein,

[0057] The first output terminal of the dimming control unit is respectively connected to the first input terminal of the LED channel array and the first input terminal of the feedback control circuit, and the second ou...

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Abstract

The invention relates to a multi-channel LED dimming circuit, which comprises a dimming control unit, a feedback control unit, a voltage regulator and an LED channel array. Wherein the first output end of the dimming control unit is respectively connected with the first input end of the LED channel array and the first input end of the feedback control circuit, and the second output end of the dimming control circuit is connected with the second input end of the LED channel array; A first output terminal of the feedback control unit is connected to an input terminal of the voltage regulator; Anoutput terminal of the voltage regulator is connected with a third input terminal of the LED channel array; An output terminal of the LED channel array is connected to a second input terminal of thefeedback control unit. The invention can effectively suppress the overshoot current of the LED when the dimming MOS tube is turned on, so that the current flowing through the LED lamp string is more stable, the service life of the LED lamp is prolonged, and the flicker of the LED lamp is avoided.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a multi-channel LED dimming circuit. Background technique [0002] In recent years, LEDs (Light Emitting Diodes) have been widely used as green, energy-saving, and long-life light-emitting products. Compared with traditional lighting sources, LED has obvious advantages. LED is essentially a semiconductor diode with typical PN junction volt-ampere characteristics, that is, the current of the LED does not change linearly with the voltage. Therefore, it is not possible to directly use a voltage source to supply power to the LED, and it is necessary to control the magnitude of the current flowing through the LED. In daily LED lighting applications, in different environments, LED lights need to adjust different brightness to meet the different needs of different people for brightness. Therefore, the brightness of LED light can be adjusted by adjusting the average current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 张艺蒙屈莎莎张玉明宋庆文汤晓燕
Owner XIDIAN UNIV
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