A Reconfigurable Partial Power Converter with Adjustable Transformer Turns Ratio for a 6.6-kW Integrated On-Board Charger

This paper proposes a novel step-up/down Type II series-connected partial power converter (S-PPC) based on a reconfigurable bridge for the dc-dc stage of a 6.6-kW integrated on-board charger (OBC). The S-PPC reconfigures its transformer primary side winding with three sets of turns ratios, which are designed to reduce the total non-active power processed. It allows the S-PPC to operate in a wide output voltage range with low conduction losses. Moreover, zero-current switching (ZCS) is achieved for the primary switches and zero-voltage switching (ZVS) for the secondary switches. Simulation results are consistent and validate the analyzes presented in this paper.