Frequency Splitting Elimination in a multi-coil power transfer system

Abstract

A multiple transmitter coil wireless power transfer system that eliminates the frequency splitting effect as a result of overcoupling between very close transmitter coils is proposed. The use of coils of different sizes in the transmitter array is proposed in order to eliminate the splitting of the magnetic field produced by the transmitters. This is done by designing three different multi-coil transmitter arrays, each with five transmitter coils with a single receiver coil placed 40 cm from the transmitters. The first array is designed with coils of the same size. The second and third arrays are designed with coils of smaller sizes placed between larger size coils. The performance of the three arrays is compared by considering the scattering parameters at the receiver coil. It is shown that using smaller coil sizes between larger coils causes uniform coupling in the multiple transmitter array, resulting in suppression and subsequent elimination of the frequency splitting phenomenon of the received signal.