Light Weight and Efficient Litz-wire Based Ferrite-less Shielding for Wireless Power Transfer

This study focuses on the implementation of ferriteless shielding for wireless power transfer applications. Shorted litz-wire based shielding is used to reduce the electromagnetic field (EMF) emissions in both lateral and vertical directions. Furthermore, the inclusion of this shielding type reduces the size and weight of EMF shielding, a critical constraint in some applications. Analysis, simulation and hardware results are presented for three systems that utilize: aluminum, aluminumferrite, and shorted litz-wire based shielding. It is found that the shorted litz-wire based shielding is able to adequately reduce EMF emissions, operate a comparable efficiency and is lighter than the other two designs.