Design and Implementation of a Bidirectional DC-DC Forward/Flyback Converter with Leakage Energy Recycled

Abstract

In this thesis a bidirectional interleaved forward-flyback DC-DC converter with leakage energy recycled is proposed The proposed converter uses two transformers to reduce the current stress on the power components to reduce the conduction loss and improve the efficiency When the proposed converter is operated in step-down stage the topology is the interleaved forward-flyback converter The voltage stress on power switches is clamped at the input voltage and the leakage energy of the transformer is recycled to the clamping capacitor and input voltage source When the converter is operated in step-up stage two flyback converters are operated in parallel and in series in input side and output side respectively The voltage stress of power switches is clamped at input voltage and the leakage energy of the transformer is recycled back to input voltage source Finally a laboratory prototype circuit with 200 V/24 V and output power 500 W is implemented to verify the feasibility of the proposed converter the highest efficiency in step-up and step-down are 95 5 % and 92 3 % respectively

Date of Award	2016 Aug 30
Original language	English
Supervisor	Tsorng-Juu Liang (Supervisor)