An LCLC-LCC Compensated Wireless Charging System With Constant Current and Constant Voltage Outputs Under Variable Mutual Inductance

To meet the stringent charging requirements of electric vehicles, wireless power transfer (WPT) systems must inherently possess both constant current (CC) and constant voltage (CV) output characteristics. However, most existing systems typically maintain CC and CV outputs only under fixed mutual inductance (MI) conditions, requiring parameter reconfiguration when MI varies, thereby limiting practical applicability. To address these limitations, this paper proposes a novel LCLC-LCC compensated WPT system that maintains both CC and CV outputs across varying MI conditions while ensuring zero phase angle (ZPA) operation in two modes. The comprehensive analysis of equivalent circuits for two operating modes and detailed derivation of topology parameters are given. Extensive simulation results validate the ZPA operation in two output modes. Finally, experimental verification is conducted. Experimental results demonstrate that the LCLC-LCC compensation system successfully achieves CC and CV outputs while maintaining ZPA input under varying MIs. When the coupling coefficient is 0.25, the maximum DC-DC efficiency in the two output modes is 93.28% and 94.35%, respectively.