Wireless power transfer for a seat-vest-helmet system
View Patent ↗Wireless power transfer system include: a seat configured to support a human and including a first resonator featuring a conductive coil formed by a plurality of loops that each encircle a common first axis, a layer of magnetic material, and a conductive shield; an article of clothing featuring a second resonator having a conductive coil formed by a plurality of loops that each encircle a common second axis, so that when the article of clothing is worn by the human and the human is seated in the seat, the first and second axes are aligned; and a first electronic apparatus positioned in the seat and coupled to the first resonator, and configured to deliver electrical power to the first resonator so that during operation of the system, power is transferred wirelessly from the first resonator to the second resonator.
1. An article configured to be worn on shoulders and an upper portion of a user's torso, comprising:
at least one piece of material configured to conform to the shoulders and the upper portion of the user's torso;
a first resonator attached to the at least one piece of material and comprising a conductive coil formed by a plurality of planar loops each positioned in a first plane to define a dipole moment for the first resonator that is aligned orthogonal to the first plane, wherein the first resonator is configured to wirelessly receive electrical power from an oscillating magnetic field;
a battery attached to the at least one piece of material;
an electrical apparatus attached to the at least one piece of material and coupled to the first resonator and the battery, and configured to store energy in the battery in response to the electrical power wirelessly received by the first resonator; and
a second resonator coupled to the battery and configured to transmit electrical power by generating an oscillating magnetic field using power from the battery,
wherein the second resonator is attached to the at least one piece of material at a location proximal to an opening in the at least one piece of material configured to at least partially surround a neck of the user; and
wherein the second resonator comprises a helical coil comprising a plurality of loops of conductive material that extend along an arc-shaped helical axis.
2. The article of claim 1 , wherein the article is a vest.
3. The article of claim 1 , wherein the second resonator further comprises an arc-shaped magnetic material with an opposite pair of surfaces of concave and convex curvature, respectively.
4. The article of claim 3 , wherein a thickness of the magnetic material in a radial direction is substantially constant.
5. The article of claim 1 , wherein the second resonator further comprises a magnetic material core formed by at least three pieces of magnetic material, and wherein the at least three pieces of magnetic material are aligned along the arc-shaped helical axis.
6. The article of claim 5 , wherein each of the at least three pieces of magnetic material has a linear central axis.
7. The article of claim 6 , wherein each of the at least three pieces of magnetic material are aligned so that the central axes of adjacent pieces of magnetic material intersect to include an obtuse angle.
8. The article of claim 5 , wherein one or more pairs of adjacent surfaces of the at least three pieces of magnetic material are beveled.
9. The article of claim 1 , wherein the second resonator is configured to transmit electrical power to a third resonator disposed on or in a member spatially separated from the second resonator.
10. The article of claim 9 , wherein a coil-to-coil efficiency of power transfer between the second and third resonators is 40% or greater.
11. The article of claim 9 , wherein a quality factor of each of the second and third resonators is greater than 100.
12. The article of claim 1 , wherein the second resonator is enclosed within a sleeve attached to the at least one piece of material.
13. The article of claim 12 , wherein the sleeve forms at least a portion of a collar of the article.
14. A wireless power transfer system, comprising:
the article of claim 9 ; and
the member comprising the third resonator,
wherein the third resonator comprises a helical coil comprising a plurality of loops of conductive material that extend along a second arc-shaped helical axis.
15. The system of claim 14 , wherein the second and third resonators have a substantially similar radius of curvature.
16. The system of claim 14 , wherein the member is configured to be worn on a head of the user.
17. The system of claim 16 , wherein the member is a helmet.
18. The system of claim 16 , wherein the helical coil of the third resonator is positioned on a surface of the member proximal to a neck of the user.
19. The system of claim 14 , wherein the third resonator comprises an arc-shaped magnetic material with an opposite pair of surfaces of concave and convex curvature, respectively.
20. The system of claim 14 , wherein the third resonator comprises a magnetic material core formed by at least three pieces of magnetic material that are aligned along the second arc-shaped helical axis.