Title :
A multi-channel Dc/Dc LED driver with inductor-less series-parallel auto-regulated rectifier
Author :
Chen Hu ; Yuanjun Zhang ; Xinke Wu ; Peng, Fang Zheng
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
An inductor-less series-parallel auto-regulated rectifying circuit is proposed for multi-channel Dc/Dc LED driver. Utilizing the charge balancing principle in capacitors and the proposed series-parallel auto-regulated secondary rectifying circuit, accurate current sharing among output LED strings is achieved. By using resonant converter as primary side inverter circuit, a resonant Dc/Dc LED driver for four LED strings is constructed. The operating principle and AC circuit equivalent are presented. The current sharing capability for each output is also discussed. A four-channel output prototype with 0.35A/channel is built up to verify the theoretical analysis.
Keywords :
DC-DC power convertors; driver circuits; equivalent circuits; light emitting diodes; rectifying circuits; resonant invertors; AC equivalent circuit; capacitors; charge balancing principle; current sharing capability; inductor-less series-parallel autoregulated rectifying circuit; multichannel DC-DC LED driver; output LED strings; primary side inverter circuit; resonant converter; series-parallel autoregulated secondary rectifying circuit;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
978-1-4673-4354-1
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2013.6520306
