Magnetic Analysis of Copper Coil Power Pad with Ferrite Core for Wireless Charging Application

Abstract

Wireless charging can automate the charging of electrical devices, very quickly connected with IoT based smart systems. The efficiency of wireless charging collectively depends on the design of the power pad, the frequency level of power transfer, the distance between the transmitter and receiver, alignment between the coils. Coils design comprehend the shape of the coil, material of the coil used, the thickness of the wire used and core shape and material used in the core. The manuscript compares the power pad coil shapes, with the introduction of ferrite material core across the coils to design an extremely efficient power pad for the wireless charging of electric vehicle. A 3D finite element method was used for analysis, due to the unconventional distribution of the flux. Only three types of coils, D, DD, and DDQ, are taken for analysis of magnetic core introduction. The comparison is made based on simulation results, magnetic flux pattern as well as data imported from the results. Ansys 3D Maxwell simulation software is used to simulate the magnetic pattern of the power pad coils. Finally, the results show the DD type coil shows the best magnetic fields and the maximum coupling coefficient with the maximum misalignment tolerance and the ferrite core across the coils have aligned the magnetic flux pattern and slightly improved the coupling coefficient.