Performance Evaluation of WPT Circuit suitable for Wireless Charging

The usage of wireless power transfer is not new nowadays particularly for the smartphone. Modern wireless power transfer technology already has a rich history of research and growth, as well as excellent marketing developments. One of the main goals of this study is to study and analyze the major challenges that affect the overall performance of the wireless charging system specifically improving further charging distance as compared to the current wireless mobile charger. By using the coil-size disparity method, the wireless charger is studied to operate over a longer distance. This work uses an impedance-based quality factor tuning technique to design the WPT system with coil size disparity. By varying the coupling coefficient and the inductor turn ratio, adjustments were made to the circuit to increase the transfer efficiency and to increase the distance of the device from the charging pad. The finding shows that the circuit could deliver a 3V dc voltage when the coupling coefficient is set to 0.1.