Design and Analysis of Wireless Power Transfer System Using Spiral Coil

Wireless power transfer (WPT) technology offers the capability to wirelessly charge electronic devices without physical connections. This study delves into the design and analysis of a WPT system with a spiral coil as a crucial component. Existing WPT systems grapple with efficiency, distance limits, and electromagnetic interference, curtailing their broad application. The proposed setup includes a tuned transmitter and receiver with spiral coils to boost efficiency and extend transfer distances. ANSYS software models and configures inductive coils, utilizing a 20-turn copper spiral coil for magnetic induction, which deviates from conventional designs. The aim is to estimate the distance between coils and the copper spiral coil, revealing insights into coil inductance. For instance, employing a 20-turn copper coil with a 0.5 mm diameter, the transmitter coil exhibits a measured inductance of 17.185 µH at a proximity of 10 mm. Similarly, the receiver coil demonstrates the highest inductance value among the tested distances, recording 17.50 µH under identical conditions. Further examination at various distances highlights notable variations. At a 50 mm distance, the transmitter coil's inductance is 17.099 µH, while the receiver coil shows a slightly higher value of 18.273 µH. These findings underscore the sensitivity of inductance to changes in the distance between transmitter and receiver coils.