A Novel Prototype of Soft-Switching Inverter-Fed DC-DC Converter with Step-Up High-Frequency Planer Transformer Secondary-Side Phase-Shifted PWM Rectifier

This paper presents a novel circuit topology of isolated DC-DC power converter, which includes stable and efficient zero voltage soft switching (ZVS) full bridge inverter in the high frequency planer transformer primary-side and zero current soft switching rectifier in its secondary side. This power converter incorporates zero current soft switching (ZCS) phase-shifted PWM controlled two active power switches in series with either right or left leg of full-bridge rectifier in the transformer secondary-side. The proposed soft switching DC-DC power converter can achieve a wide soft-switching commutation under wide load variations from an extremely light load to a heavy load at a condition of constant frequency phase-shifted PWM voltage regulation and high conversion efficiency due to reduced circulating current and idling in the primary side of the transformer. The operating principle and the performance evaluations are discussed based on simulation analysis and experimental results obtained on a 2 kW rating and 40 kHz switching frequency breadboard power converter setup. The practical effectiveness of this soft-switching DC-DC power converter with a high frequency link is proven on the basis of simulation and experimental results.