Thin, Light & Flexible Magnetic Materials for 7.7 kW Wireless Power Transfer System

This paper presents a wireless power transfer system capable of power transfer of 7.7 kW using non-traditional magnetic materials like nanocrystalline ribbons. The nanocrystalline magnetic materials are thin, light weight and mechanically robust compared to the traditional ferrite materials. A maximum coil-coil efficiency (including the compensation network) of 94% is measured at an input power level of 7.7 kW. This performance is achieved with a coil assembly using nanocrystalline ribbon sheets that are 65% lighter in weight, 84% thinner and 16% lesser magnetic field leakage when compared with the ferrite assembly.