Dynamic Behavior of Isolated DC-DC Converter Based on Bidirectional Switches

This paper presents an isolated DC-DC converter based on bidirectional switches which can achieve galvanic isolation without transformers. An overvoltage may occur in the bidirectional switches during the deadtime because of the effect of parasitic capacitance in the switches. Further, an amount of gate-source common-mode current may flow in the bidirectional switches during the deadtime which may degrade the isolation/insulation capability. However, the dynamic behavior of the converter during the deadtime has not been revealed in the past works. The aim of this paper is to provide an experimental verification of the DC-DC converter to observe the converter behavior during the deadtime. The experimental results obtained using a downscaled model reveals the relationship between the current, the voltage, and the practice impedance of the switch during the deadtime.