Design and Analysis of an Anti-Misalignment Wireless Power Transfer System

Wireless power transfer (WPT) has attracted considerable attention due to its potential application prospect. It has a requirement that the transmitting coil and receiving coil should be aligned with each other during the charging process. Once axial or radial misalignment occurs, transfer efficiency decreases. To cope with this problem, an anti-misalignment WPT system is proposed in this letter. It is designed based on nonlinear Duffing resonance. The proposed system is theoretically analyzed and power transfer efficiency is computed. Simulation and experimental work are conducted to validate the performance of the proposed system. Compared with the traditional linear WPT system, the results show that the output voltage of the proposed nonlinear system is robust to variations of operating frequency. Under axial and radial misalignments, it is found that the power transfer efficiency of the proposed anti-misalignment system is generally higher than the linear counterpart.