含有PFC的LED驱动线路的改进设计

Improvement and Design of a LED Driver with PFC

LED照明愈加得到世界各国的重视,针对LED特性文中描述了其驱动方式,分析和讨论了填谷式无源功率因数校正(Power Factor Correction,PFC)和反激拓扑的工作原理,提出了一种新的改进填谷式功率因数校正线路,并给出了仿真波形。针对高亮度LED照明的应用,文章进一步阐述了更加适合于LED照明特性的反激线路及电流采样和反馈线路,基于此原理设计了一款LED控制器产品,系统长期运行稳定可靠。

LED lighting has been more and more important in the world, LED driver has been described according to the character of LED. The principle of va/ley-filled PFC and flyback circuit has been analyzed and discussed. A novel and improved valley-filled PFC circuit is proposed with simulation result. For the application of high lighteness LED, the flyback and currentsensing and feedback circuits more suitable for LED lighting have been further studied. A LED driver has been designed according to the theory and works well and stably for a long time.