Tapped Inductor Filter Assisted Soft-Switching PWM DC/DC Converter with ZVS and ZCS Bridge Legs

摘要

This paper presents a novel high frequency transformer linked full-bridge type soft-switching phase-shift PWM control scheme DC-DC power converter, which is considered as a power conditioner for small-scale fuel cell power generation system and a power supply for 42V automobile electrical power system. Using the isolated full-bridge soft-switching DC-DC converter topology makes possible to use low voltage high performance MOSFETs to achieve high efficiency of the power conversion system. The tapped inductor filter is implemented in the proposed soft-switching DC-DC power converter topology to achieve load independent soft-switching PWM under constant high frequency operation for a wide load variation range, to minimize circulating and idling currents without using additional resonant circuit and auxiliary power switching devices. The practical effectiveness of the proposed soft-switching DC-DC power converter is verified in laboratory level experiment with 1kW-100kHz breadboard circuit using power high performance MOSFETs. Actual efficiency of 96% at maximum is obtained for the presented DC-DC power converter.