Controller and method for adjusting brightness of light source as well as lighting system

A light source brightness and lighting system technology, applied in the field of lighting systems, can solve the problem of high cost of the sudden dimming drive circuit 200, and achieve the effect of high precision

Inactive Publication Date: 2011-12-14
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the PWMOUT pin and switch 220 cause as figure 2 The cost of the burst dimming drive circuit 200 shown is relatively high

Method used

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  • Controller and method for adjusting brightness of light source as well as lighting system
  • Controller and method for adjusting brightness of light source as well as lighting system
  • Controller and method for adjusting brightness of light source as well as lighting system

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Embodiment Construction

[0019] Although the present invention will be described in conjunction with the following embodiments, it should be understood that this does not mean that the present invention is limited to these embodiments. On the contrary, the present invention is intended to cover various options, modifiable items, and equivalent items defined within the spirit and scope of the present invention defined by the appended claims.

[0020] In addition, in the following detailed description of the present invention, in order to provide a complete understanding of the present invention, a large number of specific details are clarified. However, those skilled in the art will understand that the present invention can also be implemented without these specific details. In some other examples, well-known solutions, processes, components, and circuits are not described in detail, so as to highlight the gist of the present invention.

[0021] The invention provides a controller for adjusting the brightn...

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Abstract

The invention discloses a controller and a method for adjusting the brightness of a light source as well as a lighting system. The controller for adjusting the brightness of the light source comprises a detector, a dimming signal generator and a pulse generator, wherein the detector detects an initiating stage of a burst dimming period of the light source by detecting the current passing the light source and generates a trigger signal when the initiating stage ends, in which the burst dimming period comprises a start time slot and a close time slot, and when the current passing the light source rises to a preset value, the initiating stage ends; the dimming signal generator is coupled to the detector for responding the trigger signal and triggering the start time slot of the burst dimming period, the start time slot lasts for preset duration, and the pulse generator is coupled to the dimming signal generator, used for generating a pulse signal to control a current passing the light source and is started in the start time slot and closed in the close time slot. Compared with the prior art, the invention can achieve dimming control with higher accuracy.

Description

Technical field [0001] The present invention relates to light source control technology, in particular to a controller, method and lighting system for adjusting the brightness of a light source according to a burst dimming period. Background technique [0002] The burst dimming period is used to control the brightness of the light source (eg, light emitting diode). A burst dimming cycle includes an on period and an off period. A set of current pulses flow through the light source during the on time period, and no current flows through the light source during the off time period. In this way, the brightness of the light source can be controlled by adjusting the duty cycle of the burst dimming period. [0003] figure 1 (a) is a waveform diagram of the burst dimming signal 110 for controlling the brightness of the light source. The burst dimming signal 110 alternately switches between an on period and an off period. The time length of the on time period and the time length of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02F21S2/00F21V23/00F21Y101/02
CPCH05B33/0815H05B33/0851H05B45/10H05B45/327H05B45/3725
Inventor 刘剑罗卢杨陈连平郭清泉
Owner AOTU ELECTRONICS WUHAN
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