US 12,407,187 B2
Planar omnidirectional wireless power transfer system
Junjie Feng, Blacksburg, VA (US); Qiang Li, Blacksburg, VA (US); and Fred C. Lee, Blacksburg, VA (US)
Assigned to VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed by VIRGINIA TECH INTELLECTUAL PROPERTIES, INC., Blacksburg, VA (US)
Filed on Mar. 24, 2021, as Appl. No. 17/211,215.
Prior Publication US 2022/0311277 A1, Sep. 29, 2022
Int. Cl. H02J 50/00 (2016.01); H01F 38/14 (2006.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01)
CPC H02J 50/12 (2016.02) [H01F 38/14 (2013.01); H02J 50/402 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A planar omnidirectional wireless power transfer system, comprising:
a plurality of resonant tank circuits electrically coupled to a power generator;
a planar coil arrangement for omnidirectional wireless power transfer, the planar coil arrangement comprising a plurality of individual planar coils arranged for omnidirectional wireless power transfer to a device placed over the planar coil arrangement, each of the plurality of individual planar coils being electrically coupled to a corresponding one of the plurality of resonant tank circuits, the plurality of individual planar coils comprising:
a first pair of planar graduated coils comprising two individual planar coils arranged in a side-by-side arrangement to provide field directivity in a first direction, each planar graduated coil comprising an outer winding extending around inner concentric windings, the inner concentric windings of each planar graduated coil increasingly offset away from another of the first pair of planar graduated coils;
a second pair of planar graduated coils comprising two individual planar coils arranged in a side-by-side arrangement to provide field directivity in a second direction, each planar graduated coil comprising an outer winding extending around inner concentric windings, the inner concentric windings of each planar graduated coil increasingly offset away from another of the second pair of planar graduated coils; and
a third planar coil arranged to provide field directivity in a third direction; and
a controller configured to wirelessly transmit power through one or more of the plurality of individual planar coils by individually activating the corresponding one of the resonant tank circuits with different voltage or current to provide omnidirectional power transfer to the device.