多路照明LED驱动及调光电路的设计

Design of Driving and Light Circuit Used in Multi-channel Luminal LED

照明LED正在被广泛的应用,每个LED配有一个单独的驱动源,且灯光不可调,能源浪费,为了多路LED能够随着需要调光,进行实验研究。实验采用的方法是:驱动电路和调光电路独立设置,其中驱动电路采用基于UC3845的单输入-多输出反激变换器来实现,变换器功率为87.5W,它把220V交流市电转换成五路5V直流电,为各自照明LED提供驱动电源;计算机给单片机发出调光信号,单片机控制调光电路对CD4067进行多路选择,同时产生PWM调节LED平均电流值。

Light LED is widely used today, but each LED equipped with a separate source can not adjust light and waste energy therefore. The dimming of multi-channel LED was studied. The driving circuit uses the single-input multiple-output converter based on UC3845 with the power 87.5W, which converts 220V AC utility to five 5V DC for LED. Computer gives light signal to the SCM, which manipulates the dimming circuit choose through CD4067 and produces PWM to adjust the value of average current at the same time.