A Novel Orbirect Inductive Coil Structure for Wireless Inductive Power Transfer in Electric Vehicle Battery Charging Applications

Abstract

Wireless battery charging systems for electric vehicles (EVs) are convenient, safe, and flexible against environmental hazards. Resonant inductive power transfer (RIPT) is the most common method for EV battery charging applications. The inductive coil structure is a major component of the RIPT system, and misalignment between inductive coils is a key issue. This paper proposes an improved, misalignment-tolerant, novel dual orbirect inductive coil structure. The proposed coil structure is designed using finite element modeling (FEM) and investigates magnetic parameters such as self and mutual inductance at various horizontal and vertical misalignment distances. Finally, based on the FEM analysis, the RIPT system is designed for 1 kW, and simulations were carried out in MATLAB. The presented results show that the output voltage exhibits minimal variation across 50% misalignment range. The peak efficiency achieved at full load conditions is 96.2%. © 2025 IEEE.