基于单火线的LED照明灯调光系统设计

摘要

A LED lighting system, based on the luminance signal sending module, the luminance signal receiving module, and the rightness adjustment module, has been designed to overcome the defects of current LED lighting dimming system, which fails to regulate the multi-grade stepless dimming. A bidirectional thyristor alternating current phase shift circuit has been adopted by this new system for an output in voltage waveform of a luminance signal with positive and negative half wave loss, which signal will be converted into luminance data based on double-digit ternary system. The converted luminance signal, then via a single live wire, will be sent to the the luminance signal receiving module, where it will be captured, identified and converted into a PWM signal with an adjustable duty ratio by a micro-controller. The PWM signal, sent out by the LED drive, is able to adjust the brightness of LED lighting lamps, thus realizing the multi-grade stepless dimming control within the range of 0~100%. The feasibility of the dimming system has thus been verified by experiments, with the desired results fully achieved.%针对目前LED照明灯调光系统难以实现多档无级调光的缺陷，设计一套由亮度信号给定模块、亮度信号接收模块、亮度调节驱动模块来实现LED照明灯调光系统。该系统采用双向晶闸管交流移相电路输出正负半波缺失的亮度信号电压波形，然后将其转换成2位三进制亮度数据，再通过单火线将该亮度信号发送到亮度信号接收模块，由微控器对亮度信号进行识别捕获并输出占空比可调的PWM信号，最后PWM信号通过LED驱动器对LED照明灯亮度进行调节，实现了0~100%的多档无级调光控制。通过实验验证了该调光系统的可行性，达到了预期效果。