Soft-switching operation of edge-resonant output-inductor-less full-bridge converter

摘要

Output-inductor-less full-bridge converter for a High-Voltage Direct-Current power distribution system has been proposed. This proposed circuit topology suppresses the surge voltage due to the secondary-side diode's recovery, and miniaturizes the converter because the number of circuit components is reduced. On the other hand, some problems occur, such as the increasing switching-loss of primary switches and another high-frequency noise generation. This paper proposes a novel synchronous rectifier driving for the output-inductor-less full-bridge converter in order to solve these problems, and examines the noise reduction effect, and the relationship between ZVS operation conditions and circuit parameters. The proposed method does not need an external component, and then the smaller size is maintained. Furthermore, the experimental results confirm the power loss reduction of 20W in a wide load range, and also the noise reduction.