A new soft switching current-fed isolated PWM DC_DC converter

This paper introduces a new soft switching current-fed DC-DC power converter. A clamp circuit in this converter provides soft switching condition for all switches and absorbs the voltage spikes of main switches at turn off instance. This converter contains four switches, two main switches and two auxiliary switches. Since all switches operate under soft switching condition, this converter can operate under higher switching frequency to further reduce the converter size and weight. Implementation of control circuit is very simple since the converter is PWM controlled and the auxiliary switches turn on are complementary with respect to main switches. The simulation results of proposed converter confirm the integrity of the proposed circuit.