A New Coil Structure of Dual Transmitters and Dual Receivers with Integrated Decoupling Coils for Increasing Power Transfer & Misalignment Tolerance of Wireless EV Charging System

To ensure the effectiveness of the inductive power transfer (IPT) systems for high power applications, the multiple coils are being used. But the cross-couplings among the same side coils reduce the efficiency of the system. Thus, the decoupling coils are commonly used to mitigate the same side couplings in multiple transmitters and receivers system. The decoupling coils are either used outside of the main coils or concentric with the main coils. In both cases, these decoupling coils do not take part in the power transmission and have some adverse effects on the system performance. In this paper, a new IPT system with dual transmitters and dual receivers with integrated decoupling coils is introduced. Besides mitigating the mutual inductances of the same side coils, the proposed decoupling coils are also taking part in power transmission. In addition, the proposed coils also have good misalignment performance. A three-dimensional finite element analysis (FEA) tool ANSYS MAXWELL is used to investigate the proposed magnetic coupler. A scaled-down experimental setup is used to verify the feasibility of the proposed structure. The maximum dc-dc efficiency of this system is 93.14 % while delivering 700 W to the load with a 200 mm air gap.