Inductive Power Transfer Based on Variable Compensation Capacitance to Achieve an EV Charging Profile With Constant Optimum Load

Wireless charging must be highly efficient throughout the entire battery profile to compete in electric vehicle (EV) industry. Thus, optimum load matching is commonly used: it operates at equivalent that maximizes efficiency, which depends on coil’s alignment. In this article, made independent of coils’ position by changing system’s resonant frequency through switch-controlled capacitors (SCCs). This eliminates need for load-side voltage control. The output current follows rise during cycle always match load, can achieved regulating input via power factor correction (PFC) converter. method called here constant (COL). Two SCC topologies have been implemented a 3.7-kW hardware demonstrator. one implementing half-wave modulation achieves higher efficiency than employing full-wave modulation, with 96.30% 3.2 kW and aligned coils. When misalignment occurs, technique results conventional-fixed compensation, where lower up 0.68% partial load. Based these results, proposed COL proven suitable EV-static wireless achieving highest peak efficiencies listed today’s literature same class.