Design of contactless battery charger for electric vehicle

Inductive contactless energy transfer systems (CETSs) of resonant type are advantageously used to charge the batteries of the electric vehicles. Their circuital topology and coupling coil arrangement are crucial issues in setting up an effective battery charger. This paper considers the seriesseries (SS) topology of a resonant CETS, and coupling coils set up with ferrite cores of different shape. Regarding the SS topology, its performance is investigated by defining and calculating suitable figures of merit. Regarding the coils, their arrangement is investigated by a computer-assisted finiteelement approach. Outcomes of the investigations are utilized to design a contactless battery charger for an electric city car. The design is substantiated with a numerical analysis of the electrical behavior of the charger.