中国电机工程学报2016，Vol.36Issue(2)：516-523,610,9.DOI:10.13334/j.0258-8013.pcsee.2016.02.024
基于LCLC恒流网络的LED自均流电路
A Multi-string LED Driver With Constant-current Output and Automatic Balancing
摘要
Abstract
The capacitive balancing scheme is widely used to mitigate current imbalance in driving multiple light-emitting- diode (LED) strings 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 variation to output current, and has the resistive input impedance. So fixed frequency control can be implemented to avoid the reactive power. Also, it combines the existing capacitive balancing scheme to realize multi-string current balance with the smallest additional components. Moreover, it has short-circuit protection and the pulse-width modulation (PWM) dimming can be incorporated easily. The analysis, implementation and verification were detailed in this paper.关键词
LED驱动电路/均流/谐振网络/阻性输入阻抗Key words
LED driver/current balancing/resonant circuit/resistive input impedance分类
信息技术与安全科学引用本文复制引用
唐亚鹏,曲小慧,韩洪豆,Siu-Chung Wong,ChiKong Tse..基于LCLC恒流网络的LED自均流电路[J].中国电机工程学报,2016,36(2):516-523,610,9.基金项目
国家自然科学基金项目(51107009) （51107009）
江苏省自然科学基金项目(BK20141339). Project Supported by National Natural Science Foundation of China (51107009) （BK20141339）
Natural Science Foundation of Jiangsu Province (BK20141339). （BK20141339）
