Reconfigurable <i>LLC</i> Resonant Converter for Bidirectional Electric-Vehicle Chargers
Cheol-Hee Jo, Dong-Hee Kim
Abstract
This letter proposes a reconfigurable <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converter for bidirectional electric-vehicle chargers. The proposed converter can achieve the monotonic voltage gain curves of a unidirectional <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> 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.