Analysis of Multiphase Bidirectional Non-Isolated DC to DC Converter for High Power Applications

For high-power energy storage systems, this article introduces a new multi-phase interleaved bi-directional dc/dc power converter that can connect two dc sources with differing voltage levels. When the filter voltage and current ripples are four times more than the switching frequency, the converter is suggested to decrease input and output ripples as well as the size of passive components. By dividing the current evenly across the switch branches of the converter and using a multi-phase interleaving approach to lower conduction loss, the linked inductor allows for a better power density. In various power transfer modes, the theoretical analysis and functioning of the converter are shown. Additionally, the findings of the simulation and the fundamental operating principle are detailed. It demonstrates how the converter works in both the incoming and outgoing power directions.