Family of High-Frequency Nonisolated DC-DC ZVZCS Converters with High Conversion Range

In this paper, two non-isolated DC-DC quadratic boost converters with zero voltage and zero current switching (ZVZCS) are proposed. Voltage boost is achieved by replacing the conventional inductor with coupled inductor having low turns ratio, and using voltage multiplier cell across the secondary side of coupled inductor. Use of clamp circuit with an auxiliary switch provides low voltage stress across solid state devices for entire range of duty ratio operation. Simulation was carried out on PSIM platform to test the validity of design for both converters. Experiments were performed on a designed laboratory prototype for 250 W converter.