CLOVER LEAF AND BUTTERFLY COIL STRUCTURES FOR FLAT WIRELESS COUPLING PROFILES IN WIRELESS POWER TRANSFER APPLICATIONS

摘要

In one aspect, an apparatus for wirelessly transferring charging power is provided. The apparatus comprises a coil comprising a conductor defining a plurality of sides of the coil. For each of the plurality of sides of the coil, the conductor bows toward a center of the coil as the conductor extends from an outer portion of the respective side of the coil toward a middle portion of the respective side of the coil. A magnetic coupling factor between the coil and a receive coil is within a predetermined percentage of a maximum or minimum magnetic coupling factor between the coil and the receive coil for all offsets of a center of the receive coil, with respect to the center of the coil, that are within a perimeter defined by the conductor of the coil.