Wireless enhanced power transfer

Patent metadata

Field	Value
Publication number	US-12413099-B2
Application number	US-202017764189-A
Country	US
Kind code	B2
Filing date	Sep 25, 2020
Priority date	Sep 26, 2019
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A wireless power transfer (WPT) transmitter comprising: a power transmission coil having an axis; a power source operable to generate a time varying current in the power transmission coil that generates a time varying magnetic B field; and an eddy current conductor shaped and positioned to generate eddy currents responsive to the time varying current in the power transmission coil that enhance the B field generated by the time varying current.

First claim

The invention claimed is:

1. An enhanced wireless power transfer (WEPT) transmitter comprising:
a power transmission coil having an axis;
a power source operable to generate a time varying current I T in the power transmission coil that generates a time varying magnetic B field; and
at least one eddy current conductor shaped and positioned to generate eddy currents responsive to the time varying current in the power transmission coil that produce an equivalent of a virtual mirror image of I T which enhances the time varying magnetic B field generated by the time varying current;
wherein the at least one eddy current conductor extends alongside the axis and is absent slits or holes that may operate to distort the virtual mirror image of I T .

2. The WEPT according to claim 1 wherein the at least one eddy current conductor comprises a planar eddy current conductor.

3. The WEPT according to claim 2 wherein a plane of the planar eddy current conductor is substantially parallel to the axis of the power transmission coil.

4. The WEPT according to claim 1 wherein the time varying magnetic B field is enhanced by a field amplification factor equal to or greater than about 1.25.

5. The WEPT according to claim 4 wherein the time varying magnetic B field is enhanced by a field amplification factor equal to or greater than about 1.5.

6. The WEPT according to claim 5 wherein the field amplification factor is equal to or greater than about 1.75.

7. The WEPT according to claim 6 wherein the field amplification factor is equal to or greater than about 2.

8. The WEPT according to claim 1 , wherein the at least one eddy current conductor comprises an eddy current conductor at least a portion of which partially surrounds the axis of the power transmission coil.

9. The WEPT according to claim 8 wherein the at least one eddy current conductor that partially encircles the axis of the power transmission coil is cylindrical.

10. The WEPT according to claim 1 , wherein the at least one eddy current conductor comprises a plurality of eddy current conductors.

11. The WEPT according to claim 1 , wherein the at least one eddy current conductor is shaped and positioned to lie adjacent to an inductive power receiving circuit (IPRC) to which the WEPT transmits power.

12. A system comprising:
the WEPT according to claim 1 ; and
an inductive power receiving circuit (IPRC) that is inductively coupled to the WEPT to receive power from the WEPT.

Assignees

• Soreq Nuclear Res Ct

Inventors

• Wolf Michael
• Ginzburg Boris

Classifications

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title