A novel solution using two-port network models for transient analysis of full-bridge DC-DC converter in solid state transformer

A full-bridge dc-dc converter is the key component in the topology of solid state transformer. There is a severe oscillation problem, which is caused by junction capacitance of the switches and leakage inductance of the high-frequency transformer, in the full-bridge dc-dc converters. Therefore it is very important to analyze the transient process of the full-bridge dc-dc converter for developing a solid state transformer. The circuit of the proposed full-bridge dc-dc converter is divided as three two-port networks, the transmission parameters of which are given in this paper. The experimental waveforms are showed and explained for the verification of the proposed two-port network model and the methods for suppressing the oscillation problem.