Novel High Frequency Planner Transformer Linked Soft Switching DC-DC Power Converter with Secondary Side-Phase Shifted PWM Active Rectifying Switches

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 planner 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 of a 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 a constant frequency phase-shifted PWM voltage regulation and high efficiency voltage regulation due to reduced circulating current in the primary side of the transformer. Its operating principle in steady state is described and its performances are evaluated and discussed based on simulation analysis and experimental results obtained on a 2 kW and 40 kHz 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