Quasi-square-wave rectification for front-end DC/DC converters

In the front-end DC/DC converters, the secondary rectification contributes an important part of loss. This paper investigates using synchronous rectified working in quasi-square-wave (QSW) mode to reduce both the conduction and reverse recovery loss in the secondary side. QSW can also help the soft-switching of the primary switches. A 1 kW half-bridge converter is built to verify this idea. Efficiency higher than 95% can be achieved for most of the load range for 100 kHz operation.