A High-Efficiency Single-Inductor Multiple-Output Buck-Type LED Driver with Average Current Correction Technique

Wen Hau Yang, Hsiang An Yang, Chao Jen Huang, Ke-Horng Chen*, Ying Hsi Lin

*此作品的通信作者

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

The state-of-the-art topology of a single-inductor multiple-output light emission diode (LED) driver employs time-multiplexing (TM) control multiple parallel LED strings. The TM control technology provides large output current but the inductor current is separated to several parts and unable to be used simultaneously. The limitation of TM control also results in low dimming frequency and low color resolution. Thus, a single-inductor multiple-floating-output (SIMFO) LED driver with the average current correction (ACC) technique is proposed to solve these problems, so the inductor current is simultaneously utilized by every LED in series, with enhancement of luminous efficiency. Furthermore, the proposed ACC technique adaptively adjusts the average current to eliminate the current cross-regulation effect occurring in different dimming patterns, so each different color LED has its own dimming ratio. The test chip is fabricated in a 0.5-μm high voltage (HV) process with an active area of 15 mm 2 , and experimental results show the proposed LED driver achieves 24-b color resolution with 12 W output power and maintains 96% high efficiency in the RGBW LED applications.

原文English
文章編號7935469
頁(從 - 到)3375-3385
頁數11
期刊IEEE Transactions on Power Electronics
33
發行號4
DOIs
出版狀態Published - 1 四月 2018

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