A Novel Loosely Coupled Transformers with High Misalignment Tolerance

The loosely coupled transformer used in inductive power transfer (IPT) technology usually has poor coupling performance, and its coupling performance drops significantly when the primary and secondary coils are misalignment, thereby greatly reducing the system transmission capacity. A new coil structure is proposed, the primary coil is a solenoid coil, and the secondary coil is composed of a bipolar (BPP) coil with a Q coil in series, named as the solenoid-BPPQ coil structure, which can achieve a higher misalignment range. Through the simulation tool, the coupling characteristics of the transformer are simulated under the condition of facing different misalignment. The simulation proves that the structure has high misalignment tolerance. Finally, according to the design, the primary and secondary coil experimental devices were built, and experimental verification was conducted on the experimental platform with a spacing of 200 mm.