大功率LED混光照明恒流驱动电路的设计  

Design of Constant Current Driver for High Power LED Mixed Lighting

作　　者：闫晓金[1] 

机构地区：[1]北华航天工业学院电子工程系,河北廊坊065000

出　　处：《北华航天工业学院学报》2013年第6期23-26,共4页Journal of North China Institute of Aerospace Engineering

基　　金：河北省高等学校科学技术研究青年基金项目(Q2012133)

摘　　要：在分析了大功率LED混光照明中LED光源特性的基础上,提出了三色LED恒流驱动电路的设计方案。驱动电路分别采用升压和降压拓扑结构,利用具有PWM实时调光功能的RT8452作为驱动控制芯片,通过改变外接PWM占空比即可调节LED亮度。实验证明,此驱动电路工作可靠,效率高,实现简单。Based on an analysis of LED light source characteristics in the high power LED mixed lighting equipment, this article prop-osed a designing solution in which circuit was driven by three color LED constant current. Drive circuit adopts the step-up and step- down topology respectively, with RT8452 as a drive control chip with true PWM dimming functions, adjusting LED brightness through changing external PWM duty ratio. Experiments showed that this driving circuit work were reliable, highly efficient, and simple to implement.

关 键 词：LED 混光照明 PWM控制 恒流驱动 

分 类 号：TM923[电气工程—电力电子与电力传动]