Wireless power transfer systems containing foil-type transmitter and receiver coils
First Claim
1. A wireless power transfer system, comprising:
- a foil-type transmitter coil having a plurality of turns including at least an outermost turn with at least a first arcuate-shaped corner having a concave inner surface facing a convex outer surface of an immediately adjacent one of the plurality of turns, said immediately adjacent one of the plurality of turns having at least a second arcuate-shaped corner with a concave inner surface facing a concave outer surface of an innermost one of the plurality of turns having an arcuate-shaped corner that is a mirror image of the first arcuate-shaped corner; and
wherein a middle one of the plurality of turns has flat inner and outer surfaces that face the innermost one of the plurality of turns and the outermost turn, respectively.
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Accused Products
Abstract
Wireless power transfer systems include at least one foil-type transmitter/receiver coil with a plurality of turns, which is configured to reduce eddy current losses therein when energized to conduct an alternating current that supports inductive power transfer including coil-to-coil power electrical transfer, inductive heating, etc. The plurality of turns includes at least an outermost turn with a first arcuate-shaped corner having a concave inner surface, which faces an immediately adjacent one of the plurality of turns. The immediately adjacent one of the plurality of turns may also have a second arcuate-shaped corner with a concave inner surface facing an innermost one of the plurality of turns. The first arcuate-shaped corner may have a non-uniform radius of curvature and/or an innermost one of the plurality of turns may have an arcuate-shaped corner, which is a mirror image of the first arcuate-shaped corner when the coil is view in transverse cross-section.
19 Citations
17 Claims
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1. A wireless power transfer system, comprising:
a foil-type transmitter coil having a plurality of turns including at least an outermost turn with at least a first arcuate-shaped corner having a concave inner surface facing a convex outer surface of an immediately adjacent one of the plurality of turns, said immediately adjacent one of the plurality of turns having at least a second arcuate-shaped corner with a concave inner surface facing a concave outer surface of an innermost one of the plurality of turns having an arcuate-shaped corner that is a mirror image of the first arcuate-shaped corner; and
wherein a middle one of the plurality of turns has flat inner and outer surfaces that face the innermost one of the plurality of turns and the outermost turn, respectively.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power transfer system, comprising:
a foil-type coil having N turns electrically shorted together, where N is an integer greater than three, said N turns including;
an outermost turn having an at least partially concave inner surface facing a center of said foil-type coil, an innermost turn having an at least partially concave outer surface facing the at least partially concave inner surface of the outermost turn, a next-to-outermost turn having an at least partially concave inner surface facing the center of said foil-type coil, and a next-to-innermost turn having an at least partially concave outer surface facing the at least partially concave inner surface of the next-to-outermost turn;
wherein the outermost and innermost turns are mirror images of each other when viewed in cross-section and the next-to-outermost and next-to-innermost turns are mirror images of each other when viewed in cross-section; and
wherein each of the outermost, next-to-outermost, innermost and next-to-innermost turns has at least one arcuate-shaped corner.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
Specification