Magnetic field design for optimal wireless power transfer to multiple receivers

Abstract

This study proposes a model of multiple receivers in resonant wireless power transmission. Based on the dual‐load series‐resonant wireless power transfer system, the expression of system efficiency and its calculation model is achieved using the coupled mode theory. Considering the mutual coupling between loads, the system transmission efficiency is analysed against the intrinsic decay rate and coupling coefficient by Matlab simulation. The diversity effects of introducing aluminium material are analysed by electromagnetic field analysis through JMAG. Base on the principles of the eddy current loss, the laminated aluminium structure is adopted to restore the transmission characteristics effectively. Finally, 96 kHz magnetic resonant wireless power transfer test platform is established to verify the correctness of theoretical analysis.