Single Phase Multilevel Converter Based Battery Charger For Low Power EV Charging

Adoption rate of Electric Vehicles (EVs) is highly influenced by charging infrastructure. Onboard battery chargers are preferred to recharge the battery packs installed in low power EVs. This paper presents a two-stage five-level rectifier based on-board charger for EV charging application. The proposed five-level rectifier constituted by six active switches capable to produce five distinct voltage level which reduces the size of filter and improves the power quality. The control scheme and the operating states for the rectifier are presented in detail. With the applied control scheme, the rectifier is capable to achieve unity power factor for all output voltages and regulated output voltage at the charging port. The proposed battery charger is capable to attain high efficiency which can ultimately make it suitable to work in integration with utility grid.