Comparison of Switching Loss of Single-Phase Step-Up/Step-Down Bidirectional Converter with Voltage-Fed/Current-Fed Hybrid-Type Operation

Abstract

Electric energy storage systems are very important as one of the solutions to global warming. Step-up/step-down characteristics are required for electric energy storage systems. In addition, such systems must have high efficiency, low cost, and small scale. Therefore, the authors proposed a single-phase step-up/step-down bidirectional converter with voltage-fed and current-fed hybrid-type operation. The proposed converter consists of a two-quadrant dc-dc converter and a single-phase voltage-fed converter. The circuit has several advantages such as low switching loss, use of very small capacitance, and so on. In this paper, the authors compare a comparison of the switching losses with a simple analysis.