Powering LED Using High-Efficiency SR Flyback Converter

A high-efficiency synchronously-rectified (SR) flyback converter with the proposed multi-function circuit is presented herein so as to get through not only playing the role of an LC snubber but also detecting the zero crossing of the current to reduce switching loss and feeding the peripheral circuit. And hence, this converter has high efficiency all over the operating range, and, together with one front-end power-factor-correction (PFC) AC-DC converter, is applied to feeding the LED street light. In this paper, the basic operating principles of the proposed topology are firstly illustrated in details, and secondly some simulated and experimental results are provided to demonstrate the effectiveness of the proposed topology.