Reconfigurable LLC Resonant Converter for Bidirectional Electric-Vehicle Chargers

This letter proposes a reconfigurable LLC resonant converter for bidirectional electric-vehicle chargers. The proposed converter can achieve the monotonic voltage gain curves of a unidirectional LLC resonant converter in both charging and discharging modes by designing the resonant inductors using a coupled inductor and the structure of the windings in the transformer. To validate the proposed converter, a 3.6-kW experimental prototype was configured. Results showed that it achieved maximum efficiencies of 96.86% and 95.95% in the charging and discharging modes, respectively.