Research on CLLLC Bi-directional Resonant Based on Time-domain Analysis

Bidirectional resonant converter has the advantages of wide range soft switch and wide range of voltage application. It is widely used in electric vehicles and other fields. Among them, THE CLLLC type bidirectional resonant converter is more conducive to bidirectional energy flow due to its bidirectional structure symmetry. The fundamental wave analysis method is more convenient for resonant converter design, but the calculation results of time domain analysis method are more accurate, so it can be better applied to resonant converter design. Therefore, in this paper, the CLLLC resonant converter is first modeled by time-domain analysis, and the phase shift soft start is introduced. This design realizes the global soft switch and can maintain stable output voltage over a wide input voltage range, effectively reducing the starting current. Finally, a 1KW SIC-CLLLC resonant converter is built according to the design. Simulation and experiment prove the effectiveness of time domain analysis method and phase shift soft start.