Microsoft Corporation
Charging device that focuses flux by flowing current through spirals in opposing radial directions

Abstract:

Charging devices described herein include at least one coil having spirals through which current flows in opposing radial directions to focus flux. For instance, the flux for a coil may be focused in a shape of a toroid having first and second cross-sections that intersect the respective spirals of the coil at a plane in which the spirals are defined. Focusing the flux in this manner may facilitate wireless power transfer from the coil(s) to a chargeable wireless device.