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Drive circuit and method of drive light source and controller

A driving circuit and controller technology, applied in the field of circuits, can solve problems such as dimming control errors of the lamp driving circuit 100, and achieve the effect of improving accuracy

Inactive Publication Date: 2011-04-13
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the average current value of the current ILIGHT will not change according to the duty ratio of the pulse width modulation signal 120, thus causing an error in the dimming control of the lamp driving circuit 100

Method used

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  • Drive circuit and method of drive light source and controller
  • Drive circuit and method of drive light source and controller
  • Drive circuit and method of drive light source and controller

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Embodiment Construction

[0029] A detailed description will be given below of embodiments of the present invention. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, any modifications or equivalent replacements made to the present invention shall fall within the protection scope of the present invention.

[0030] 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, methods, procedures, components and circuits well known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0031] Embodiments of the present invention provide a driving circuit for driving a...

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Abstract

The invention discloses a drive circuit and method of a drive light source and a controller. The drive circuit comprises a frequency controller and a switching module, wherein the frequency controller receives a first dimming signal; if a light source is controlled according to the first dimming signal, the light source emits the preset brightness; when the frequency of the first dimming signal is within at least one preset range, the frequency controller generates a second dimming signal according to the first dimming signal, wherein when the frequency of the second dimming signal is beyond the at least one preset range, the switching module switches on and off alternately according to the second dimming signal so as to acquire the preset brightness; when the frequency of the first dimming signal is beyond the at least one preset range, the switching module switches on and off alternately according to the first dimming signal so as to acquire the preset brightness. The frequency of the dimming signal in the drive circuit is less than the preset maximum threshold value all along, therefore, the frequency noise cannot influence the dimming control of the light source and the precision of the drive circuit is improved.

Description

technical field [0001] The invention relates to a circuit, in particular to a driving circuit, method and controller for driving a light source. Background technique [0002] Light sources such as light emitting diodes (LED, Light Emitting Diodes) or cold cathode fluorescent lamps (cold cathode fluorescent lamp, CCFL) are widely used in the lighting industry, especially in the backlight of liquid crystal displays (LCD, Liquid Crystal Display), street lighting and household electrical appliances etc. The lamp driving circuit can adjust the energy delivered to the light source according to the dimming signal (for example: pulse width modulation signal). [0003] figure 1 Shown is a prior art lamp driver circuit 100 . The lamp driving circuit 100 includes an AC-DC converter 104 , a power converter 106 and a dimming module 112 . The AC-DC converter 104 converts the input AC voltage provided by the AC power source 102 into a first DC voltage. The power converter 106 converts...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCH05B33/0854H05B45/10H05B45/38
Inventor 易新敏郭清泉王建平石峰
Owner AOTU ELECTRONICS WUHAN
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