Modular resonant DC/DC converter for DC grid system applications

A modular resonant DC/DC converter for DC microgrid system applications is provided in this study. Half‐bridge circuit cells are connected in series to reduce the voltage stress on each half‐bridge circuit, so that power metal–oxide–semiconductor field‐effect transistors with high‐frequency operation can be used at high‐voltage DC/DC converters and the converter size can be reduced. To balance input split voltages, flying capacitors are used and connected between each half‐bridge circuit. Therefore, input split voltages can be balanced automatically in each switching cycle without using the complexity control scheme. Resonant circuit is used in each half‐bridge cell to realise the zero‐voltage turn‐on for power switches and zero current turn‐off for rectifier diodes over the wide load range. Therefore, the proposed modular resonant DC/DC converter with high‐circuit efficiency can be achieved. The output sides of half‐bridge circuit cells are connected in parallel to reduce the current stress of all passive components. Finally, the circuit performance of the proposed converter is evaluated by experiments.