A Fuzzy Control for a Nine-Phase Integrated On-Board Battery Charger

Recharging faster and faster while making the vehicle less heavy and expensive is an increasingly stimulating challenge for the automotive industry. With regard to AC charging systems, which require appropriate energy conversion structures to be installed on board, the charging speed is directly proportional to the size of the mounted charger. A possible solution that allows eliminating the installed charger and using the same powertrains components both in charging and propulsion mode is the integrated on-board battery charger. In this paper we propose a recharging control algorithm for an electric vehicle's (EV) powertrain based on a nine-phase machine with a nine-phase inverter/rectifier and used as an integrated charger. The proposed algorithm combines the voltage oriented control with both fuzzy logic and adaptive hysteresis band control. Both charging mode (single-phase or three-phase) an vehicle-to-grid (V2G) are achievable at unity power factor grid side and without torque production by the machine.