Isolated interleaved-phase-shift-PWM dc-dc ZVS converters

This paper describes the operation principles of an isolated ZVS dc-dc converter, which is composed by two half-bridge converters. Soft-switching is achieved for a wide load range. This ZVS dc-dc converter operates at constant frequency and it is phase-shift modulated. The main advantage of the phase-shift interleaving is the equalization of the input capacitor voltage, where each capacitor shares one-quarter of the total input voltage. The converter can be an alternative for ZVS phase-shift full-bridge dc-dc converter for high voltage applications, as result of the series arrangement in of the two half-bridge converters. Analysis, operating principle and design procedures are presented in the paper. Experimental results from a 1.5 kW prototype converter operating at 100 kHz with isolated 60V/25A output are presented to validate the theoretical analysis.