Speaker
Description
Inductive wireless power transfer (WPT) systems use magnetic fields to transfer power between a transmitter and a receiver; the receiver is typically integrated into a device with a battery to be charged, e.g., in smartphones or electric vehicles. The highest fields, which are typically generated at the surface or in locations closest to the coils of these devices, decay rapidly as a function of distance from the device, and the rate of decay depends on the construction of the device. Since the sensors of measurement systems have dimensions of millimeters to centimeters, the field at the surface needs to be extrapolated. In this study, the error for assessing the incident field at the surface of devices is determined for different extrapolation methods, and a new extrapolation model is developed and validated. Th new model allows the compliance of WPT devices to be demonstrated with the incident field at the surface with an uncertainty of less than 30%.
