Commutation Control of CLLC Resonant Converter Based on Optimal Trajectory Control Strategy

Abstract

CLLC converters are widely used in bidirectional DC applications, particularly in aviation and vehicle power supplies, requiring high dynamic commutation performance. This paper presents a commutation control method for CLLC converters based on a state trajectory model. The forward and reverse state trajectory models are developed, and the optimal commutation trajectory is derived. The gate drive signal's pulse width is calculated based on the post-commutation gain. Simulations validate the proposed model's accuracy and the control method's dynamic performance, showing significant improvement over traditional linear control methods.