Presentation Description: This paper shows a novel measurement procedure of the AC rated current of wireless power coils. The AC rated current is defined as the RMS current at a certain frequency at which the temperature of a wireless power coil has increased by 40°C in comparison to the ambient temperature. The results are verified mathematically and by simulation with Ansys Maxwell ICEPAK. In total, for 60 standard coils of the Würth Elektronik (WE) portfolio the AC rated current has been measured by using the novel method. For all of them, the value for the AC rated current has been calculated as well and for 9 coils the results have been verified by simulation as well. The deviation of the simulated and measured results is in average about 4 % and the deviation between measured and calculated results is about 6 %. The average derating of all 60 coils, which is the relation between the measured AC and DC rated current value, is about 80 %. In addition, the paper also shows a novel measurement setup to determine the coupling of different wireless power coil pairs in dependence of their misaligments in x, z and y direction in a semi-automated way. For the programming of the setup, a LabVIEW programm has been made. It is described in detail in the paper, how the coupling factor of different coil pairs have been determined with the novel measurement setup.
