Analysis and design of a multi‐channel constant current light‐emitting diode driver based on high‐frequency AC bus

Autor:	Can Zou, Luowei Zhou, Bo Zhao, Shubo Zhi, Quanming Luo
Rok vydání:	2013
Předmět:	Physics business.industry Electrical engineering Luminance law.invention Rectifier Amplitude Reliability (semiconductor) law Electronic engineering Constant current Electrical and Electronic Engineering business Resonant inverter Diode Light-emitting diode
Zdroj:	IET Power Electronics. 6:1803-1811
ISSN:	1755-4543
DOI:	10.1049/iet-pel.2012.0696
Popis:	To obtain sufficient luminance and achieve higher reliability, light-emitting diodes (LEDs) are usually arranged in parallel strings in many high-power applications. Since current imbalance should be avoided among the parallel LED strings, a multi-channel constant current LED driver based on high-frequency AC bus is proposed in this study. The proposed driver is composed of one resonant inverter followed by passive resonant rectifiers according to the number of LED strings. The amplitude of the high-frequency AC bus voltage is regulated by the resonant inverter and each LED string is individually powered with constant current by its corresponding passive resonant rectifier. The proposed driver is characterised by low cost and high efficiency. Finally, a prototype is built to verify the performance of the proposed driver.
Databáze:	OpenAIRE
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