A Method for Interoperable Interface Description of Inductive Power Transfer Systems

In this paper we propose a method for inductive power transfer systems (IPTS) that uses an impedance-based approach for the interface description between vehicle and infrastructure. Thus, interoperability between vehicle and infrastructure can be described and both subsystems can be developed independently. The method preserves flexibility in electronic and magnetic design by not imposing specific electrical circuits or coil topologies. We show how an impedance zone can be derived by using the example of an existing IPTS. We then present a test bench that can be applied to verify the requirements for conformance. In this way, interoperability in the field can be assured, with any Vehicle Assembly (VA) being able to receive power from any Ground Assembly (GA) for all possible operation points.