Impedance Measurement on Inductive Power Transfer Systems

Inductive charging of electric vehicles requires that the vehicle and ground systems work together for power transfer from grid to the vehicle battery. In order to qualify if the vehicle system is compatible with the ground system, the presented impedance of the vehicle to the ground system can be used for characterization. However, there are no commercially available systems existing that are able to measure the impedance precisely while power transfer. For this reason, we developed a device that can be applied to characterize the presented impedance of vehicle systems. We will present first measurement results that were obtained with the device and discuss the main challenges in impedance measurements during power transfer.

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