Abstract: In order to improve the coupling capability of electric vehides involving wireless charging system to
enhance the transmission efficiency of the system, we summarized the existing WPT ( Wireless Power
Transmission) modes, introduced the working principle of ICPT(Inductive Coupled Power Transfer) system,
established the mutual inductance mathematical model of ICPT system with magnetic core, and analyzed the
relationship among mutual inductance, property of magnetic core, property of coil, axis offset distance and
magnetic shielding effect of loosely coupled transformer with different structures. The simulation results show that
the influence of core attributes on mutual inductance is limited, the influence of coil property on mutual
inductance has no upper limit, and the ICPT system with a magnetic stripe core at transmitter and a disk core at
receiver can satisfy the power supply demand and the electromagnetic shielding requirement of electric charging
system of electric vehicle.

Key words: electric vehicle, mutual inductance, electromagnetic shielding, wireless charging, inductive coupled power transfer