Nanocrystalline structures for wireless charging systems
Implementations described herein provide systems and methods for wireless charging. In one implementation, a base has a planar surface. One or more posts extend from the planar surface of the base to form a core. Each of the one or more posts is formed from a plurality of nanocrystalline sheets. The plurality of nanocrystalline sheets of each of the one or more posts is oriented in planes perpendicular to the planar surface of the base. One or more coils are wound around each of the one or more posts to form coil windings.
1 . An apparatus comprising:
a base having a planar surface;
one or more posts extending from the planar surface of the base to form a core, each of the one or more posts formed from a plurality of nanocrystalline sheets, the plurality of nanocrystalline sheets of each of the one or more posts being oriented in planes perpendicular to the planar surface of the base; and
one or more coils wound around each of the one or more posts to form coil windings.
2 . The apparatus of claim 1 , wherein the plurality of nanocrystalline sheets is aligned with a direction of magnetic flux generated by a wireless charging assembly including the core.
3 . The apparatus of claim 1 , wherein the plurality of nanocrystalline sheets is bonded by and interleaved with a plurality of adhesive layers.
4 . The apparatus of claim 3 , wherein the plurality of adhesive layers comprises pressure sensitive adhesive (PSA) or epoxy.
5 . The apparatus of claim 1 , wherein the base comprises a second plurality of nanocrystalline sheets.
6 . The apparatus of claim 5 , wherein each of the second plurality of nanocrystalline sheets of the base comprises 20 to 50 sheets.
7 . The apparatus of claim 1 , wherein the plurality of nanocrystalline sheets for each of the one or more posts comprises 20 to 50 sheets.
8 . The apparatus of claim 1 , wherein each of the plurality of nanocrystalline sheets has a magnetic permeability of 10,000 to 15,000 in a plane parallel to the sheet and a magnetic permeability of 10 or less in a direction perpendicular to the sheet.
9 . The apparatus of claim 1 , wherein the one or more posts includes a first post and a second post.
10 . The apparatus of claim 9 , wherein the apparatus comprises a dielectric spacer disposed over the base between the first post and the second post.
11 . The apparatus of claim 10 , wherein the coil windings extend to be above the dielectric spacer.
12 . The apparatus of claim 10 , wherein the coil windings extend between a surface of the dielectric spacer and a surface of the base.
13 . The apparatus of claim 1 , wherein the plurality of nanocrystalline sheets are iron-based nanocrystalline sheets.
14 . The apparatus of claim 13 , wherein the iron-based nanocrystalline sheets comprises Si from 8.0 to 9.4 wt %, Nb from 4.8 wt % to 6.4 wt %, B from 1.0 wt % to 2.2 wt %, and Cu from 0.80 wt % to 2.20 wt %, with Fe as a balance.
15 . The apparatus of claim 1 , wherein each of the plurality of nanocrystalline sheets has a thickness from 15 μm to 20 μm.
16 . The apparatus of claim 1 , further comprising:
a wireless charging assembly including the core, the wireless charging assembly configured to generate a magnetic flux.
17 . The apparatus of claim 16 , wherein the wireless charging assembly is housed in an enclosure formed by a plurality of peripheral surfaces.
18 . The apparatus of claim 16 , wherein the wireless charging assembly provides power wirelessly to an accessory.
19 . The apparatus of claim 18 , wherein the power is wirelessly provided to the accessory at a frequency of 100 kHz to 400 kHz.
20 . An apparatus comprising:
a plurality of nanocrystalline sheets, each of the plurality of nanocrystalline sheets including an X-Y planar surface, the plurality of nanocrystalline sheets forming a nanocrystalline-based wireless power transfer core; and
a wireless power transfer coil wound circumferentially about the nanocrystalline-based wireless power transfer core along X-Z planes perpendicular to the X-Y planar surfaces.