基于LCLC恒流网络的LED自均流电路_唐亚鹏.pdf

第 36 卷第 2 期中国电机工程学报 , 2016 516 2016 年 1 月 20 日 Proceedings of the CSEE ?2016 . DOI :- 文章编号: 0258-8013 (2016) 02-0516-08 中图分类号: TM 46 基于 LCLC 恒流网络的 LED 自均流电路唐亚鹏 1 ,曲小慧 1 ,韩洪豆 1 ,Siu-Chung Wong 2 ,Chi Kong Tse 2 (1 .东南大学电气工程学院,江苏省南京市 210096 ; 2 .香港理工大学电子及资讯工程学系,香港特别行政区) A Multi-string LED Driver With Constan t-current Output and Automatic Balancing TANG Yapeng, QU Xiaohui, HAN Hongdou, WONG Siu-Chung, TSE Chi Kong ( 1. School of Electrical Engineering, Southeast University, Na njing 210096, Jiangsu Province, China; 2. Dept. of Electronic and Information Engineering, Th e Hong Kong Polytechnic University, Hong Kong, China) ABSTRACT: The capacitive balancing scheme is widely used to mitigate current imbalance in driving multiple light-emitting- diode (LED) st rings due to simplicity and reliability. To drive LEDs with the required current, variable frequency control will bring the high reactive power and increase VA ratings of the main switches. Fixed frequency control does not permit zero-voltage switching (ZVS) under load variations. To solve it, this paper proposed a multi-string LED driver with constant-current output and automatic balancing. The driver based on an LCLC resonant tank decouples the effect of load vari ation to output current, and has the resistive i