High Efficiency Isolated AC-DC Converter with Gradationally Controlled Voltage Inverter for On-Board Charger

A new isolated AC-DC converter for an on-board charger has been developed. It consists of an AC-DC converter with Gradationally Controlled Voltage Inverter and an isolated zero-voltage-switching DC-DC converter. To make these converters cooperate efficiently over the wide range of operating voltage conditions, we developed an optimized converter control. As a result, the new isolated AC-DC converter can operate with power conversion efficiency of over 94%.