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LED dimming circuit

A dimming circuit and control circuit technology, applied in the direction of light source, electric light source, electrical components, etc., can solve the problems of low precision and narrow dimming range, and achieve the effect of high application value and expanding the range of dimming.

Inactive Publication Date: 2016-03-23
WUHU RUIXIN ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the LED dimming circuit has the problems of low precision and narrow dimming range.

Method used

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Embodiment

[0015] An LED dimming circuit, the LED dimming circuit includes a control circuit, a clock module, a phase shift module and a PWM comparison module, the control circuit is connected to the clock module, the phase shift module and the PWM comparison module, and the control circuit passes Control the clock module, phase shift module and PWM comparison module to generate corresponding dimming signals. The clock module is connected to the phase shift module and is a clock signal that provides a reference for the dimming frequency. The phase shift module is based on the access of the load condition, frequency division and phase shift are performed on the input reference frequency, the PWM comparison module is connected to the phase shift module, and the corresponding dimming package is generated through the result of frequency division and phase shift by the phase shift module under the action of the control circuit Network signal, thereby changing the brightness of the light.

[0...

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Abstract

The invention discloses an LED dimming circuit. A control circuit comprises three parts, so that the dimming circuit can be endowed with functions of selecting load paths and different dimming frequencies; a clock module is provided with an oscillator, so that the problem of reduced precision caused by the fact that an error generated by a previous operational amplifier is amplified through a next operational amplifier can be solved; a shaping circuit is arranged in a PWM comparison module, so that the dimming circuit can adapt to signals in more ranges; and a phase difference between each group of dimming signals in the PWM comparison module is 1-3pi / n, so that the dimming range can be expanded; and therefore, the dimming circuit has very high application values.

Description

technical field [0001] The invention relates to the field of LED circuits, in particular to an LED dimming circuit. Background technique [0002] Light-emitting diode is a new type of semiconductor solid-state cold light source. It is the fourth generation of new light source after white light, fluorescent light and high-intensity discharge light. It has the advantages of low power consumption and long life. LED lighting is a typical energy-saving, environmentally friendly green lighting. Therefore, the use of LED lighting has been recognized as an important way to save energy and protect the environment under the circumstances of increasing environmental protection pressure and global energy shortage. Therefore, LED lighting is widely used in various fields of life, which further promotes the development of LED lighting technology. LED is a device that converts electrical energy into light energy by using a semiconductor PN junction or similar structure. At present, the ...

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 崔俊国朱成华
Owner WUHU RUIXIN ELECTRONICS TECH CO LTD
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