Class E isolated DC-DC converter using PWM synchronous rectifier

Class E isolated DC-DC converters regulating the output voltage at fixed switching frequency are presented and experimental results given. They consist of class E series resonant inverter, high-frequency transformer and the controllable class E low dv/dt synchronous rectifier. By controlling the conduction time of a controlled switch in rectifier, high-frequency ac current will be rectified and the output voltage can be controlled or regulated in the same time. By parallel connection of the rectifiers at each secondary coil of transformer and applying the PWM control to each rectifier, the circuits supplies and regulates the multiple output voltages at a fixed switching frequency and maintains the ZVS condition of all switches from full-load to open-load.