Abstract: Systems and methods for a twisted rectangular litz wire for generating or receiving wireless electrical power. The rectangular litz wire may be arranged as a DD coil having first and second co-planar loops. The loops may have a shared single-stacked inner portion and double-stacked outer portions. The litz wire may be twisted between the inner and outer portions, such that a width of the coils at the outer portions is defined by a first longer side of the wires, and a width of the coils at the inner portion is defined by a second shorter side of the wires. This arrangement may reduce a size of the DD coil may reducing a width of the shared inner portion.

Abstract: Techniques for manufacturing an induction coil for use in a wireless power transfer system are provided. An example of a wireless power transfer device according to the disclosure includes a first combined ferrite and coil holder and a second combined ferrite and coil holder, such that the first combined ferrite and coil holder and the second combined ferrite and coil holder are separate components, a first coil disposed on the first combined ferrite and coil holder, and a second coil disposed on the second combined ferrite and coil holder, such that the second combined ferrite and coil holder is adjacent to and coplanar with the first combined ferrite and coil holder, and the first coil and the second coil are operably coupled to one another.

Abstract: Systems and methods for a twisted rectangular litz wire for generating or receiving wireless electrical power. The rectangular litz wire may be arranged as a DD coil having first and second co-planar loops. The loops may have a shared single-stacked inner portion and double-stacked outer portions. The litz wire may be twisted between the inner and outer portions, such that a width of the coils at the outer portions is defined by a first longer side of the wires, and a width of the coils at the inner portion is defined by a second shorter side of the wires. This arrangement may reduce a size of the DD coil may reducing a width of the shared inner portion.

Abstract: An apparatus for wirelessly transferring power comprises a first coil having a first winding path and a second winding path. The apparatus comprises a holder configured to hold the first coil and the second coil in a predetermined winding pattern. Each of the first and second winding paths comprise a plurality of successive winding groups. In each of the plurality of successive winding groups, at least a portion of each winding of consecutive windings is disposed on top of an immediately previous winding on the holder for a predetermined number of windings. Each of the successive winding groups of the first winding path is disposed along an outer perimeter of an immediately previous winding group and each of the successive winding groups of the second winding path is disposed along an inner perimeter of an immediately previous winding group.

Abstract: Methods and apparatuses for thermal dissipation in vehicle pads for wireless power transfer applications are provided. In some implementations, an apparatus for wirelessly receiving charging power is provided. The apparatus comprises at least one receive coil configured to wirelessly receive the charging power. The apparatus further comprises a plurality of electrical components configured to convert the charging power to a direct current. The apparatus further comprises a primary heat sink comprising a plurality of fins configured to dissipate heat generated by the plurality of electrical components. The plurality of fins are disposed adjacent to the plurality of electrical components. The apparatus further comprises at least one thermally conductive structure configured to physically connect at least some of the plurality of electrical components to the primary heat sink.

Abstract: An apparatus for wirelessly transferring power comprises a first coil having a first winding path and a second winding path. The apparatus comprises a holder configured to hold the first coil and the second coil in a predetermined winding pattern. Each of the first and second winding paths comprise a plurality of successive winding groups. In each of the plurality of successive winding groups, at least a portion of each winding of consecutive windings is disposed on top of an immediately previous winding on the holder for a predetermined number of windings. Each of the successive winding groups of the first winding path is disposed along an outer perimeter of an immediately previous winding group and each of the successive winding groups of the second winding path is disposed along an inner perimeter of an immediately previous winding group.