Line voltage compensation technology for AC-direct multiple-string LED drivers

IEICE Electronics Express

Xin-quan Lai¹  Cong Liu¹  Han-xiao Du¹ 

[1] Institute of Electronic CAD, Xidian University

关键词: LED;    AC driver;    line regulation;    multi-string LED;   

DOI  :  10.1587/elex.12.20150873

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(12)An AC-mains voltage compensation technology for variable load multiple-string LED drivers is presented. By forming a closed loop control of the multiple reference voltages and by introducing an external compensation resistor, the output luminance is well compensated in case of line voltage variations. The proposed technology along with the accompanied AC-direct multiple-string LED driver were integrated in an 1 µm trench-isolated BCD process and tested with a three-string prototype. With very few external components used, the line regulation character of the LED driver is highly optimized by the proposed technology. The experimental results show that within 15% AC-mains voltage tolerance, the output luminance deviation is restrained to 2.0% (1.5%) under 10 W, 110 V/AC (220 V/AC), 50 Hz conditions.

【 授权许可】

Unknown