Extended Phase Shift Control of a Novel Bidirectional DC–DC Converter With Direct Power Transfer

This article addresses the phenomenon of backflow power (BFP) in traditional phase shift control of novel bidirectional dc-dc converters (BDCs) with direct power transfer (DPT). BFP typically results in lower efficiency and higher current stress, particularly in applications with a wide range of input/output voltages. By employing extended phase shift (EPS) control, this study eliminates BFP while extending the range of zero voltage switching (ZVS), even under light load conditions. Furthermore, the adoption of coupled inductors, which facilitate DPT and current slope adjustment within the topology, reduces the total conduction losses and current stress. Detailed mathematical analysis, simulation results, and experimental findings validate the superior performance of the proposed converter in battery charging applications.