Increase efficiency of wireless power transmission with conical coil

Wireless power transmission (WPT) is a widely adopted technology with promising applications. However, conventional WPT systems suffer from magnetic leakage, energy loss, and reduced efficiency. To address these challenges, this study proposes a conical primary coil and establishes a hardware experimental platform for evaluation. Comparative experiments between a conventional planar coil and the conical coil were conducted at various frequencies and distances. Experimental results demonstrate that the conical coil improves transmission efficiency by up to 10 % compared to the planar coil under identical conditions, achieving 91.8 % efficiency at 5 cm and 85.6 % at 8 cm, compared to 82.4 % and 76.8 % for the planar coil, respectively. To further analyze the magnetic field distribution, Maxwell software simulations were conducted. The results reveal that the conical coil enhances energy density, extends transmission range, and effectively reduces magnetic leakage. This study introduces a novel coil geometry that significantly improves WPT performance, providing valuable insights for future high-efficiency WPT systems.