A Compact and High Quality Factor Archimedean Coil Geometry for Wireless Power Transfer

A compact, magnetically coupled wireless power transfer (MC-WPT) planar Archimedean coil (PAC) geometry is presented. This PAC geometry combines conventional planar aligned and anti-aligned coils in a single Archimedean layout, resulting in a quality factor (Q) twice that of a conventional coil. The PAC WPT system demonstrates a measured power transfer efficiency (PTE) that is improved from 15% to 35%. Moreover, with the use of the Archimedean coil geometry, the WPT system exhibits a higher PTE over a wider range of frequencies. This compact PAC geometry is 10% smaller in size than its conventional counterparts, and maintains a larger PTE with lateral coil misalignment.