Comparative Analysis of Magnetic Materials, Coil Structures and Shielding Materials for Efficient Wireless Power Transfer

While wireless power transfer (WPT) promises a more convenient means of powering devices, its fruition is primarily predicated on how much efficiency can be derived. Coil structures and shielding materials play pivotal role in increasing power transfer efficiency. However, existing coil structures still perform inefficiently in WPT and shielding materials used in the literature need to be improved upon. This paper proposes a layered DD coil structure as an efficient option for WPT application. Also, materials known to have good magnetic properties are investigated alongside ferrite, which is known to have a good efficiency for WPT but at resonant frequency, its absolute power transfer capability reduces significantly. It can be deduced from our results that the proposed layered DD structure provides better efficiency than its nearest competitor structure, DD coil. Our results also show that for high power transmitting application, cobalt-iron material should be considered instead of Ferrite.