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A Flyback DC-DC Converter Employing a Synchronous Rectifier Driven by a New Voltage/Current Mixed Method  

Lee, Darl-Woo (청주대학교 전자공학과)
Ahn, Tae-Young (청주대학교 전자공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.55, no.9, 2006 , pp. 472-477 More about this Journal
Abstract
This paper presents a new voltage/current mixed method for driving synchronous rectifiers (SR) adapted to the flyback topology. The synchronous rectifier driven by the proposed voltage/current mixed method can operate at a wide load range with high efficiency. The gate voltage of MOSFET in the synchronous rectifier can be easily controlled by changing the ratio of resistors, irrespective of a line and load fluctuation. A 200W (12V/17A) prototype converter was built and an efficiency of 93% was measured at 10A load current.
Keywords
Synchronous Rectifier; Voltage Current Driven; Flyback Converter;
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