Open AccessAnalysis and design of a multi‐channel constant current LED driver based on DC current bus distributed power system structure
Author(s) -
Zu Aqian,
Luo Quanming,
Huang Jian,
He Qingqing,
Sun Pengju,
Du Xiong
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.0203
Subject(s) - constant current , current (fluid) , buck converter , flyback converter , power (physics) , converters , led circuit , led lamp , computer science , electrical engineering , power factor , light emitting diode , current source , correctness , electronic engineering , voltage , engineering , boost converter , physics , quantum mechanics , programming language , short circuit
The colourful light emitting diode (LED) strings require the corresponding driver to achieve independent control of each output current in the applications of RGB mixed colour LED lighting, LED projection etc. For this purpose, a multi‐channel constant current LED driver based on DC current bus distributed power system structure is proposed and analysed here, which is composed of a source converter and several load converters as needed. The source converter adopts the flyback converter to realise power factor correction, electrical isolation, and the load converter adopts the current‐type buck converter to realise independent control of the corresponding output current. A 60 W experimental prototype for 42.8 V/0.35 A, 40 V/0.5 A, 35.7 V/0.7 A three outputs with the universal input voltages 90–264 V is designed and implemented, and the experimental results are presented to verify the correctness of the theory analysis.