Ferrite arrangement in a wireless power-transfer structure to mitigate dimensional tolerance effects on performance

Abstract

Systems and methods are described for a ferrite arrangement that mitigates dimensional-tolerance effects on performance of a wireless charging pad, such as a WEVC pad. These systems and methods include a power-transfer structure having ferrite bars arranged to form ferrite strips in a staggered pattern to provide a path for magnetic flux induced by a magnetic field. The staggered pattern includes a series of ferrite strips that alternate defined starting-point locations at opposing sides of the power-transfer structure. Ending-point locations of the ferrite strips are not defined, but are based on an accumulation of lengthwise dimensional tolerances of the ferrite bars used to form the ferrite strips. Using the staggered pattern in a base power-transfer structure defines a coupling range for coupling with a vehicle power-transfer structure and a range limit for associated magnetic field emissions by the base power-transfer structure.