A Novel Triple Quadrature Pad for Inductive Power Transfer Systems for Electric Vehicle Charging

This paper proposes a novel Inductive Power Transfer (IPT) pad called Triple Quadrature Pad (TQP) consisting of three decoupled coils controlled independently as a primary pad with various excitation modes to enhance tolerance to horizontal displacement as well as air-gap variations. Operation of this pad is compared with Bipolar Pad (BPP) as the most effective IPT pad when used with Double-D Pad (DDP) and Circular Pad (CP) as polarized and non-polarized secondary pads, respectively, to show interoperability between different magnetic topologies. In addition, a variable excitation mode based on relative phase control of these three coils is applied which makes power transmission in large lateral misalignments. TQP is designed to maintained leakage magnetic flux below ICNIRP guidelines. Uncompensated power and coupling coefficient of most effective excitation modes as function of lateral displacement of both TQP and BPP used with DDP and CP as secondary pads are compared and power transferability of TQP to maintain required coupling coefficient in various air-gap have been also investigated.