High-efficiency multi-string LED driver based on constant current bus with time-multiplexing control

被引：12
|
作者：
Liu, Xueshan [1 ]
Xu, Jianping [1 ]
Yang, Qi [1 ]
Xu, Duo [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Elect Engn, Chengdu, Sichuan, Peoples R China
来源：
ELECTRONICS LETTERS | 2016年 / 52卷 / 09期
基金：
中国国家自然科学基金;
关键词：
driver circuits; electric current control; switching convertors; high-efficiency multistring LED driver; constant current bus; time-multiplexing control scheme; front-end high-efficiency converter; time-multiplexing switch; current flowing path; output filter capacitor; power; 7; 2; W;
D O I：
10.1049/el.2016.0236
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A high-efficiency multi-string LED driver based on constant current bus with time-multiplexing control scheme is proposed and analysed. Each LED string is connected to the constant current bus, which is provided by the output of a front-end high-efficiency converter. The current of each LED string can be independently controlled by the turn on duty ratio of its time-multiplexing switch. A capacitor is connected to the current bus to provide a current flowing path for constant bus current when none of the LED string is connected to the current bus. It needs only one output filter capacitor, which makes circuit volume small and cost low. Finally, a 7.2 W two-string LED driver is provided to verify the studied results.
引用
收藏
页码：746 / 747
页数：2
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