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International Journal of Photoenergy
Volume 2013, Article ID 471384, 8 pages
Research Article

Design of High Efficiency Illumination for LED Lighting

1Department of Electrical Engineering, National Formosa University, Yunlin County 63201, Taiwan
2Department of Electrical Engineering, I-Shou University, Kaohsiung 84001, Taiwan

Received 11 September 2013; Accepted 6 October 2013

Academic Editor: Teen-Hang Meen

Copyright © 2013 Yong-Nong Chang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A high efficiency illumination for LED street lighting is proposed. For energy saving, this paper uses Class-E resonant inverter as main electric circuit to improve efficiency. In addition, single dimming control has the best efficiency, simplest control scheme and lowest circuit cost among other types of dimming techniques. Multiple serial-connected transformers used to drive the LED strings as they can provide galvanic isolation and have the advantage of good current distribution against device difference. Finally, a prototype circuit for driving 112 W LEDs in total was built and tested to verify the theoretical analysis.