The strategy of combining one cycle control and PD control for primary-side controlled wireless power transfer system

Wireless power transfer (WPT) using double-sided LCC compensation features with a proportional relation between input voltage and output current, which is load independent. It lays a solid base for primary-side DC/DC control. In this paper, a novel switching converter control strategy — one cycle control (OCC) combined with proportion differentiation (PD) is proposed to form a robust, fast and precise control for primary-controlled WPT system. The OCC-PD is compared with PID and conventional OCC using Switching Flow-Graph technique. The dynamic responses of different control strategies applied in buck converter connected with a resistor and with WPT stage as the load are analyzed respectively, which guides the design of the proposed control strategy. Finally, the OCC-PD applied in single-stage buck converter and two-stage primary-controlled WPT system is carried out in Matlab/Simulink environment to verify the theoretical analysis, which confirms the superiorities of the proposed OCC-PD strategy.