New Phase Shift Modulated ZVS Full-Bridge DC/DC Converter with Minimized Auxiliary Current for Medium Power Fuel Cell Application

This paper presents a new DC/DC converter topology for low input voltage, medium power applications such as a 7.75 kW residential solid oxide fuel cell (SOFC). The proposed converter uses adaptive energy storage to minimize auxiliary circulating currents and maximize efficiency. It also has a simple topology and low component count. Analysis and a design process are presented. The proposed topology and another widely-used ZVS-PSM-FB topology are simulated to compare conduction losses and converter efficiency. The proposed circuit is found to have 50-70% lower MOSFET conduction losses and 2-4% higher efficiency from full load to no load