Single, Double and Triple Layered Spiral Pads for Wireless Power Transfer Systems

Wireless Power Transfer (WPT) Technology is proliferating the domain of battery based devices and machines for its ability to offer higher security and mobility while charging. WPT is yet to mature in terms of Power Transfer Efficiency (PTE) and Transferred Power (TP). WPT finds huge application in electric vehicles, medically-implanted devices and consumer electronics like laptops and mobile phones. The wireless mobile charging products follow Qi standards, released by Wireless Power Consortium. In this paper, a new coil structure is proposed based on the dimensions specified by Qi standards. A detailed geometric analysis for 2-coil WPT system is presented. Furthermore, three different coil structures are simulated to attain the good coupling factor using magnetic resonant coupling technique. A new coil structure called triple-layered square spiral coil is proposed to achieve better output in terms of coupling factor. The simulations results are compared and the significant results are highlighted.