An Improved Estimation Method of Mutual Inductance Angle for a Two-Dimensional Wireless Power Transfer System

The improvement of power transmission efficiency (PTE) is an important issue in the design of a wireless power transfer (WPT) system. The WPT system with multiple transmitting (Tx) or receiving (Rx) coils is a way to improve the PTE. This paper deals with the estimation of the mutual inductance angle for a two-dimensional (2D) WPT system with two Tx coils and one Rx coil. The mutual inductance angle is one of the most important parameters to determine the PTE in the 2D WPT system. The condition for the maximum PTE is investigated and the mutual inductance angle is defined for the 2D WPT system. An improved estimation method of the mutual inductance angle is proposed based on the phase-locked loop (PLL) technique using the voltages and currents of the Tx coils. The simulation and experimental results are provided to validate the effectiveness of the proposed method.

Automated summary

The paper addresses the estimation of mutual inductance angle in a 2D WPT system with two Tx coils and one Rx coil, which is crucial for determining the PTE. An improved estimation method based on PLL technique using voltages and currents of Tx coils is proposed and validated through simulation and experimental results.