Hybrid Compensation Network for Misalignment-Tolerant Constant Current/Constant Voltage Charging for Wireless Power Transfer System

This paper presents the hybrid compensation network to achieve constant current/constant voltage (CC/CV) charging for wireless charging of Electric Vehicle (EV) with misalignment tolerant capability. The double-sided LCC (DS-LCC) compensation is used for CC charging whereas the LCC-S compensation is employed for CV charging. The battery pack of an EV is characterized as an equivalent variable resistance during CC/CV charging, whose data is based on the charging profile of the Nissan Leaf EV battery pack. The switching between the two compensation networks in the proposed hybrid compensated WPT system is controlled completely by the secondary side thereby eliminating real-time communication between the primary and secondary side. However, the phase shift control is utilized in the primary side inverter to maintain the corresponding CC and CV charging mode during the case of misalignment. A level 1 WPT system’s theoretical analysis and simulation model incorporating phase shift control is proposed to achieve CC/CV charging of EV batteries during the case of misalignment. The design procedure along with all the simulation results is analyzed and discussed in detail.