Isolated On-Board Battery Charger Integrated with 6-phase Traction Drive

This paper proposes an innovative topology of on-board battery charger (OBC) for electric vehicles integrated with the traction motor drive. The proposed single phase input OBC, applicable for 6-phase traction drives, is deeply integrated within the vehicle powertrain, to reduce cost and volume of the charger respect to conventional non-integrated solutions. The proposed structure provides galvanic insulation between the grid and the battery, not guaranteed by the other fully integrated chargers in the literature. A dedicated control strategy was developed for absorbing the AC grid current at unitary power factor and low harmonic distortion without torque production during the charging stage. The performance of the proposed OBC are tested by accurate simulation models.