Analysis and design of a new three-phase resonant DC-DC converter with a capacitive output filter

This paper presents a new topology for three-phase soft-switched LCC resonant DC-DC power conversion. Simple, yet accurate analysis of the topology based on fundamental mode approximation and its extension are presented. A practical, step-by-step design procedure is proposed. Advantages of the power converter include soft-switching for the inverter switches, a narrow control frequency range and six-pulse input and output ripple frequency components. The topology is suitable for high power, high-frequency, high-voltage applications and is relatively insensitive to the transformer leakage inductance.