System Modeling and Switching Control Strategy of Wireless Power Transfer System

This paper proposed a fast and robust control strategy for a wireless power transfer system using primary side control. First, a sinusoidal reference trajectory signal was generated by analyzing the properties of the vector fields associated with all possible configurations of the primary power converter. Then, a switching controller was designed based on the switching behavior of the converter and the trajectory reference signal for the switched differential equations, capturing the dynamics of the primary side converter. Finally, a set of points around the reference trajectory was defined to establish the global asymptotic stability. The proposed control strategy has higher dynamic responding speed to large variations and perturbations of the load in comparison to other suggested controllers. The simulation and experimental results show that the primary current overshoot was efficiently suppressed, and the system response performance was improved.