The LLC resonant converter can be utilized in the new energy vessel power systems, connecting new energy sources and power batteries. Employing a phase-shift modulation (PSM) strategy instead of pulse frequency modulation (PFM) can enhance the utilization of magnetic components and improve the power density of the converter. However, the new energy vessel power systems face the challenge of rapidly fluctuating and unpredictable propulsion loads, necessitating the LLC resonant converter to possess a swift dynamic response capability. However, a state trajectory analysis and control strategy based on PSM remains lacking. This work conducts a state trajectory analysis of the LLC resonant converter under PSM, and the accuracy of the depicted trajectories is verified through simulation. This paper can serve as a foundation for subsequently proposing an optimal trajectory control strategy.

LLC resonant converter,phase-shift modulation,state trajectory