A D4Q Pad with High Misalignment Tolerance for Inductive Power Transfer System

This paper proposes a three-transmitting-coils IPT system to improve the misalignment tolerance. In order to decouple the transmitting coils, a novel three-coil structure is explored to fully utilize the benefits of symmetric structure. In this paper, different coil structure, such as circular pad, double D(DD) pad, and double D quadrature (DDQ), are studied to evaluate the decoupling mechanism and compare the misalignment tolerance. Finally, a novel D⁴Q planar charging pad is developed to improve the misalignment tolerance in a horizontal plane. The Maxwell-based simulation is used for verification. It shows the effective charging area of the proposed D⁴Q pad is improved by 6% compared to the DDQ pad.