Multi-string AC-powered LED driver with current regulation reduction based on simple circuitry

IEICE Electronics Express

Kilsoo Seo²  Jusung Park³  Hanjung Song⁴  Van Ha Nguyen⁴  Jinwoo Jung¹ 

[1] MagnaChip Semiconductor, Ltd.;Power Semiconductor Research Center, KERI;Department of Electronic Engineering, Busan University;Department of Nanoscience and Engineering, Inje University

关键词: LED;    AC driver;    shunt regulator;    flicker;    multi-string LED;   

DOI  :  10.1587/elex.11.20140810

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(7)Cited-By(2)In this letter, a new simple circuitry LED driver with current reduction is proposed, realized and experimentally validated. The proposed circuit comprises with very few components intended for making a cost-effective and compact design while still shows a high performance. The circuit reduces non-conducting time of LEDs to enhance power factor (PF) and total harmonic distortion (THD). The flicker can also be relatively reduced. By using current limiter cells, lighting variation is eliminated with respect of the variation of AC input voltage. A worst case of a 4 W with only two LED-strings driver is implemented and tested by using a 1 um 650 V-BCDMOS high voltage process to verify advantageous characteristics of the suggested scheme. Experimental results demonstrate a PF of 0.97 with a THD of 24.62% and an efficiency of 87.1% at a 220 V AC supply.

【 授权许可】

Unknown