Small-signal Modeling of CLLC Bidirectional Resonant Converters

CLLC bidirectional resonant converter inherits the advantages of high efficiency and high power density of LLC resonant converter, and has a symmetrical bidirectional voltage gain, which is suitable for applications where power flows in both directions. Based on the extended description function method, a small-signal model was established for the CLLC bidirectional resonant converter. The Bode plot was drawn by MATLAB based on the derived small-signal model. The validity of the model was verified by comparing the Bode plot obtained by analyzing the dynamic characteristics of the simulated circuit.