WIRELESS ENERGY TRANSFER FOR MOBILE DEVICE APPLICATIONS

• US 20150303707A1
• Filed: 04/16/2015
• Published: 10/22/2015
• Est. Priority Date: 04/16/2014
• Status: Abandoned Application

• Current Assignee: WiTricity Corporation
• Original Assignee: WiTricity Corporation
• Inventors: McCauley, Alexander P., Alinger, Dustin J.
• Application Number:
  US14/688,333
• Publication Number:
  US 20150303707A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A resonator for a wireless energy transfer system may include a first resonator coil, wherein the first resonator coil may be configured to transfer wireless energy to a second resonator coil when the first resonator coil is proximate to the second resonator coil. A first winding of trace may be included in the first resonator coil, wherein the first winding of trace may include conductive material. A second winding of trace may be included in the first resonator coil, wherein the second winding of trace may include conductive material. A portion of the trace of the first winding may cross over a portion of the trace of the second winding at a crossover point.

Claims

1. A resonator for a wireless energy transfer system comprising:

a first resonator coil, wherein the first resonator coil is configured to transfer wireless energy to a second resonator coil when the first resonator coil is proximate to the second resonator coil;

a first winding of trace in the first resonator coil, wherein the first winding of trace includes conductive material;

a second winding of trace in the first resonator coil, wherein the second winding of trace includes conductive material; and

wherein a portion of the trace of the first winding crosses over a portion of the trace of the second winding at a crossover point.

2. The resonator of claim 1 wherein the portion of the trace for the first winding crosses over the portion of the trace for the second winding at the crossover point without physical contact between the portion of the trace for the first winding and the portion of the trace for the second winding.

3. The resonator of claim 2 wherein the first resonator coil is printed on a printed circuit board, wherein the portion of the trace for the first winding stops on a first side of the printed circuit board at the crossover point and continues on a second side of the printed circuit board, wherein the portion of the trace for the second winding on the second side of the printed circuit board stops on the second side and continues on the first side after the crossover point.

4. The resonator of claim 3 wherein the portion of the trace for the first winding stops on the first side of the portion of the trace for the second winding on a first layer of a printed circuit board before reaching the crossover point, and continues on the second side of the portion of the trace for the second winding on a second layer of the printed circuit board after reaching the crossover point.

5. The resonator of claim 1 wherein a second portion of the trace for the first winding crosses over a second portion of the trace for the second winding at a symmetrical crossover point.

6. The resonator of claim 1 wherein the crossover point occurs in a middle portion of the first resonator coil.

7. The resonator of claim 1 wherein the crossover point occurs in an end portion of the first resonator coil.

8. The resonator of claim 1 wherein the trace of at least one of the first winding and second winding includes copper coil.

9. The resonator of claim 1 further comprising:

a first layer of conductive material positioned proximate to the second layer;

the second layer of magnetic material positioned proximate to the first layer of conductive material and a third layer;

the third layer positioned proximate to the second layer and a fourth layer, wherein the third layer includes a first resonator coil; and

the fourth layer positioned proximate to the third layer, the fourth layer including a plurality of pieces of conductive material.

10. A wireless energy transfer system comprising:

a first layer of conductive material positioned proximate to a second layer;

the second layer of magnetic material positioned proximate to the first layer of conductive material and a third layer;

the third layer positioned proximate to the second layer and a fourth layer, wherein the third layer includes a first resonator coil, wherein the first resonator coil is configured to transfer wireless energy to a second resonator coil when the first resonator coil is proximate to the second resonator coil, wherein the first resonator coil includes,

a first winding of trace in the first resonator coil, wherein the first winding of trace includes conductive material;

a second winding of trace in the first resonator coil, wherein the second winding of trace includes conductive material;

wherein a portion of the trace for the first winding crosses over a portion of the trace for the second winding at a crossover point; and

wherein the fourth layer includes a plurality of pieces of conductive material.

11. The system of claim 10 wherein the portion of the trace for the first winding crosses over the portion of the trace for the second winding at the crossover point without physical contact between the portion of the trace for the first winding and the portion of the trace for the second winding.

12. The system of claim 11 wherein the portion of the trace for the first winding stops on the first side of the portion of the trace for the second winding on a first layer of a printed circuit board before reaching the crossover point, and continues on the second side of the portion of the trace for the second winding on a second layer of the printed circuit board after reaching the crossover point.

13. The system of claim 10 wherein a second portion of the trace for the first winding crosses over a second portion of the trace for the second winding at a symmetrical crossover point.

14. The system of claim 10 wherein the crossover point occurs in a middle portion of the first resonator coil.

15. The system of claim 10 wherein the crossover point occurs in an end portion of the first resonator coil.

16. The system of claim 10 wherein the trace of at least one of the first winding and second winding is copper.

17. The system of claim 10 wherein at least one of a size, a shape, and a geometric position of the plurality of pieces of conductive material reduces inductance shifting in the second resonator when the second resonator coil is proximate to the first resonator coil.