# US 2014/0197691 A1 · Wireless Energy Transfer for Misaligned Resonators

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- Number: US 2014/0197691 A1
- Document ID: US20140197691A1
- Status: Published application
- Kind: A1
- Application number: 13/740,323
- Filed: 2013-01-14
- Published: 2014-07-17
- Earliest claimed: 2013-01-14
- Assignees: Mitsubishi Electric Research Laboratories, Inc.
- Applicants: Mitsubishi Electric Research Laboratories, Inc
- Inventors: Bingnan Wang; Jing Wu; William Yerazunis; Koon Hoo Teo
- Web page: https://patentgrep.com/patent/US20140197691A1

## CPC

- H01F 38/14: Inductive couplings
- H01F 27/361: {made of combinations of electrically conductive material and ferromagnetic material}
- H01F 27/363: {made of electrically conductive material}
- H01F 27/366: {made of ferromagnetic material}
- H01F 27/36: Electric or magnetic shields or screens (movable for varying inductance H01F21/10)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A system for transferring energy wirelessly includes a source for generating a circular polarized field in response to receiving the energy and a sink strongly coupled to the source for receiving the energy wirelessly via a resonant coupling of the field.

## Claims

### Claim 1

A system for transferring energy wirelessly, comprising:
a source for generating a circular polarized field in response to receiving the energy; and
a sink strongly coupled to the source for receiving the energy wirelessly via a resonant coupling of the field.

### Claim 2 (depends on 1)

The system of claim 1, wherein the field is electromagnetic field and includes two perpendicular fields having 90° difference in phases, and substantially equal amplitudes.

### Claim 3 (depends on 1)

The system of claim 1, wherein, during the coupling between the source and the sink, a coil of the source is arranged side-by-side with a coil of the sink, such that an axis of the coil of the source and an axis of the coil of the sink are in one plane, wherein the coil of the sink has a degree of freedom for azimuth rotation around the axis of the coil of the sink.

### Claim 4 (depends on 1)

The system of claim 1, wherein, during the coupling between the source and the sink, an axis of a coil of the source is arranged on one line with an axis of a coil of the sink, and the coil of the sink is rotated around the axis of the coil of the sink, such that a plane of the coil of the source differs from a plane of the coil of the sink.

### Claim 5 (depends on 1)

The system of claim 1, further comprising:
a load for receiving the energy from the sink; and
a driver for supplying the energy to the source such that the source generates the circular polarized field.

### Claim 6 (depends on 1)

The system of claim 1, wherein the source includes a pair of orthogonal coils, and further comprising:
a driver for supplying the energy to coils in the pair with 90° difference in phases.

### Claim 7 (depends on 6)

The system of claim 6, wherein the sink includes a pair of orthogonal coils arranged side-by-side with the pair of orthogonal coils of the source.

### Claim 8 (depends on 1)

The system of claim 1, wherein the source includes a pair of orthogonal coils and a perfect electric conductor (PEC) plate arranged adjacent to the coils.

### Claim 9 (depends on 1)

The system of claim 1, wherein the sink includes a pair of orthogonal coils and a perfect electric conductor (PEC) plate arranged adjacent the coils.

### Claim 10 (depends on 1)

The system of claim 1, wherein dimensions of a coil of the source are greater than dimensions of a coil of the sink.

### Claim 11 (depends on 1)

The system of the claim 1, wherein an area formed by a coil of the source is greater than an area formed by a coil of the sink.

### Claim 12

A method for transferring energy wirelessly, comprising:
generating a circular polarized field in response to receiving the energy; and
transferring the energy wirelessly via a resonant coupling of the field.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
increasing a coupling coefficient of the coupling using an electric conductor plate arranged within the field on a direction opposite to a direction of the energy transfer.

### Claim 14 (depends on 12)

The method of claim 12, further comprising:
increasing a coupling coefficient of the coupling using an electric conductor plate arranged within the field such that the plate prevents the field to propagate in a direction opposite to a direction of the energy transfer.

### Claim 15 (depends on 12)

The method of claim 12, further comprising:
receiving the energy as two signals having 90° difference in phases.