Control Structure for Bidirectional Battery Charger Integrating 3φ PFC AC/DC and CLLC DC/DC Converters

This paper proposes a control structure for a bidirectional battery charger using a three-phase PWM ac/dc converter and a resonant CLLC dc/dc converter. The proposed control system with a staged architecture focuses on improving the power quality and minimizing total harmonic distortion of the system. A variable frequency hysteresis control system along with a current control loop is employed for the ac/dc converter for the fast charging phase of the battery. For optimal performance, the CLLC converter is designed to operate at the resonant frequency. Simulation results obtained using PLECS simulation software are presented to validate the performance of the proposed control system.