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Design and implementation of high frequency AC-LED driver with digital dimming

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4 Author(s)
Chao-Lung Kuo ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Tsorng-Juu Liang ; Kai-Hui Chen ; Jiann-Fuh Chen

In this paper a two-stage high frequency AC-LED driver is designed and studied. The front-stage is a boost power-factor correction (PFC) circuit and the rear-stage is a halfbridge series resonant inverter. The lighting characteristics of high frequency AC voltage driving LEDs, and the effect of LED to half-bridge resonant circuit are discussed. The proposed design uses the digital dimming control to reduce LED chromaticity shift, and connect the LEDs as a full-bridge rectifier to simplify the current sensing circuit. An 80-W high frequency AC-LED driver with universal voltage input (90~264 Vrms) is implemented to verify the design. Experimental results show that the variation of chromaticity coordinates (u', v') from brightness 100% to 20% is within 0.0023.

Published in:

Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on

Date of Conference:

May 30 2010-June 2 2010