Asymmetric Resonant Tank Design for a Bidirectional CLLC Resonant Converter in G2V and V2G Operation

In this paper, we present a design method for an asymmetric CLLC resonant converter based on the behavior of the converter in time-domain. Instead of using simplified equations, a highly parallelized simulation workflow is used to collect a database with non-dimensionalized result data including the impact of non-linear semiconductor output capacitances. An algorithm searches the database for valid resonant tank configurations for multiple operating points defined in forward and reverse operation, evaluating output power, soft switching, and frequency range. Finally, the capability of the proposed algorithm and the database approach is validated against the specification for a bidirectional charger with 3.6 kW output power, a wide battery voltage range, and verified by measurements on a lab demonstrator.