New Integrated Tripolar Pad Using Double-Sided LCC Compensation for Wireless Power Transfer

In this paper, a new integrated tripolar pad using double-sided LCC compensation is proposed and then based on the circuit characteristic, which is analyzed in detail, the introduced system is simulated and investigated. The tripolar pad utilizes three decoupled coils and shows a promising tolerance against rotational displacements and consequently provides a convenience for the user to park the vehicle. Due to compensator coils, the double-sided method of compensation is more massive than the other methods. Here, the authors offer a scheme to make the wireless power transfer system more compact by integrating the compensation inductors with the main couplers. In order to locate the best place to embed the compensator coils, the flux density between the couplers is analyzed. Additionally, it is shown that since the pad is composed of multiple coils, there are some undesired mutual inductances that should be designed for the least possible values. The behaviors of the proposed pad are analyzed and thoroughly discussed based on four different displacements. In order to validate the theoretical results, a 500 W wireless power transfer is fabricated and tested at 85 kHz for the proposed double-sided LCC compensation. The simulation and experimental results show the performance of the proposed structure.