Wireless charging system with magnetic field shaping for electric vehicles

A wireless charging system with magnetic field shaping is proposed. The magnetic field of wireless power transmission is shaped by an innovated structure of resonator, which is named as Shaped Magnetic Field Resonator (SMFR). The magnetic field is shaped within the zone of active transmission and the magnetic flux density is greatly reduced outside the zone of active transmission. Therefore, the Electromagnetic Interference (EMI) to adjacent electric devices is drastically diminished. The high temperature effect of shielding material induced by eddy current on the shielding material is also improved. Besides, the transfer efficiency can be improved. The numerical analysis (Finite Element Analysis) of the proposed resonators by electromagnetic simulation software is carried out for analyzing the shaped magnetic field. Finally, the proposed system is implemented to validate the feasibility.