A Simple Two-Channel LED Driver With Automatic Precise Current Sharing

Author

Wu, Xinke ; Zhang, Junming ; Qian, Zhaoming

Author_Institution

Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China

Volume

58

Issue

10

fYear

2011

Firstpage

4783

Lastpage

4788

Abstract

A simple rectifying circuit for an isolated two-channel LED driver without active current-sharing control is proposed. An alternating current source can be used to generate a two-channel LED driver with the proposed rectifying structure. With the proposed H-bridge rectifier and a block capacitor in series with the secondary side winding of the transformer, the currents in two LED strings are shared automatically even for different LED strings with different voltage drops. The operation principle of the rectifier is analyzed with a sinusoidal current source, and it is verified with a series-parallel resonant (LLC) dc/dc converter. This proposed rectifier can be applied to other converters featuring a high-frequency current source link.

Keywords

DC-DC power convertors; capacitors; driver circuits; light emitting diodes; rectifiers; H-bridge rectifier; LED strings; LLC DC-DC converter; active current-sharing control; automatic precise current sharing; block capacitor; series-parallel resonant DC-DC converter; two-channel LED driver; Capacitors; Converters; Driver circuits; Light emitting diodes; Rectifiers; Switches; Voltage control; Charge balancing; LED driver; current sharing for LED strings;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2011.2109339

Filename

5704204