Design and Development of a Resonant Converter Adapted to Wide Ouput Range in EV Battery Chargers

The interest on Electric Vehicles (EV) have increased nowadays on behalf of the global threat of fossil fuel depletion and increasing environmental effects due to the usage of those fuels. The EV battery has to cope up with time to time power variations and the charging profile is also different with that of other batteries. Hence a battery charger which can provide wide output voltage according to the demand is needed for EVs and such a charger is proposed in this paper. The design and development of a resonant LLC dc-dc converter is explained where this type of converters can work in higher frequencies thus reducing the size of the involved components and can execute soft switching techniques so as to increase the efficiency of the system. A 30kW battery charger is designed and the effectiveness of the system is verified by MATLAB/SIMULINK.