Controller and method for controlling dimming of light sources, and light source driving circuit

A technology of driving circuit and controller, which is applied in the field of light source driving circuit and controller for controlling light source dimming, which can solve the problems that users cannot adjust the brightness and achieve the effect of improving energy utilization efficiency and dimming accuracy

Inactive Publication Date: 2012-03-28
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the disadvantages of this traditional solution is that the desired brightness is preset, and the user cannot adjust the brightness during use.

Method used

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  • Controller and method for controlling dimming of light sources, and light source driving circuit
  • Controller and method for controlling dimming of light sources, and light source driving circuit
  • Controller and method for controlling dimming of light sources, and light source driving circuit

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Embodiment Construction

[0031] Detailed reference will be given below to examples of the present invention. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.

[0032] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the gist of the present invention.

[0033] image 3 Shown is a schematic diagram of a light source driving circuit 300 according to an embodiment of th...

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PUM

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Abstract

The present invention discloses a controller and a method for controlling dimming of light sources, and a light source driving circuit. A controller for controlling dimming of a light-emitting diode (LED) light source provides a pulse signal by comparing a sensing signal indicative of a current flowing through the LED light source to a reference signal. The controller controls the current throughthe LED light source according to the pulse signal during a first state of a pulse-width modulation signal and cutting off the current through the LED light source during a second state of the pulse-width modulation signal. The controller receives a dimming request signal indicative of an operation of a power switch coupled between an AC power source and a bridge rectifier and adjusts both a level of the reference signal and a duty cycle of the pulse-width modulation signal based on the dimming request signal.

Description

technical field [0001] The invention relates to a controller and a method for controlling the dimming of a light source and a light source driving circuit. Background technique [0002] In recent years, new light sources such as light-emitting diodes (light-emitting diodes, LEDs) have made progress in materials and manufacturing. LED has the characteristics of high efficiency, long life, bright colors, etc., and can be used in the fields of automobiles, computers, communications, military and daily necessities. For example, LED lamps can replace traditional incandescent lamps as lighting sources. [0003] figure 1 Shown is a schematic diagram of a conventional LED driving circuit 100 . LED driver circuit 100 utilizes LED chain 106 as a light source. LED chain 106 includes a plurality of LEDs connected in series. The power converter 102 is used to convert the DC input voltage Vin into a desired DC output voltage Vout for powering the LED chain 106 . The switch 104 conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCY02B20/345H05B33/0812Y02B20/348H05B33/0845H05B33/0815H05B33/0848Y02B20/343H05B33/0818H05B45/14H05B45/395H05B45/10H05B47/185Y02B20/30H05B45/375
Inventor 郭清泉阎铁生苏新河林永霖
Owner AOTU ELECTRONICS WUHAN
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