# US 12,112,877 B2 · Coil arrangement with reduced losses and a stabilized coupling factor, and system for wireless power transfer

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- Number: US 12,112,877 B2
- Document ID: US12112877B2
- Status: Granted
- Kind: B2
- Application number: 18/104,680
- Filed: 2023-02-01
- Published: 2023-06-08
- Granted: 2024-10-08
- Earliest claimed: 2019-10-08
- Assignees: TDK Electronics Co., Ltd.
- Applicants: TDK Electronics AG
- Inventors: Thomas Lohmann
- Web page: https://patentgrep.com/patent/US12112877B2

## CPC

- H01F 27/28: Coils; Windings; Conductive connections
- H01F 27/38: Auxiliary core members; Auxiliary coils or windings
- H01F 27/08: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)
- H01F 27/24: Magnetic cores
- H01F 38/14: Inductive couplings
- H02J 50/10: using inductive coupling
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H01F 27/255: made from particles (H01F27/26 takes precedence)
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A coil arrangement with reduced losses and a stabilized coupling factor. For this purpose, the arrangement has a coil core and a first winding, the turns of which are distributed over several sections which are spaced apart from one another.

## Claims

### Claim 1

A system for wirelessly transferring electrical power, comprising:
a primary coil arrangement; and
a secondary coil arrangement with reduced losses and a stabilized coupling factor, wherein the secondary coil arrangement includes
a coil core defining an axis, and
a first winding, the turns of which are wound around the axis, wherein
the turns are distributed over two or more sections and the two or more sections are spaced apart from one another;
wherein the primary coil arrangement comprises a first primary coil section and a second primary coil section, the first primary coil section being wound around a first primary axis and the second primary section being wound around a second primary axis,
wherein the first primary axis, the second primary axis, and the axis are different axes, and
wherein the primary coil arrangement includes a double-D coil.

### Claim 2 (depends on 1)

The system according to claim 1, wherein the secondary coil arrangement consists of the spaced-apart sections and electrical connections without a complete turn.

### Claim 3 (depends on 2)

The system according to claim 2, wherein the axis runs through the coil core.

### Claim 4 (depends on 1)

The system according to claim 1, wherein the coil core includes a ferrite material or consists of a ferrite material.

### Claim 5 (depends on 1)

The system according to claim 1, wherein the coil core is a cylindrical coil core, a plate-like coil core, or a plate-like coil core with a rectangular base area.

### Claim 6 (depends on 5)

The system according to claim 5, wherein
the coil core is plate-like and
has a rectangular base area with a width, b, of 200 mm≤b≤300 mm, a length, l, of 350 mm≤1≤450 mm and a thickness, d, of 9 mm≤d≤15 mm.

### Claim 7 (depends on 6)

System according to claim 6, wherein the number of sections is 2, 3, 4, 5, 6, or more.

### Claim 8 (depends on 1)

The system according to claim 1, wherein two sections are arranged on opposite sides of the coil core.

### Claim 9 (depends on 1)

The system according to claim 1, wherein the coil core has a length, l, in the direction of the axis and the distance, d, between sections of the winding is:
0<d≤0.9 l or
0.2 l≤d≤0.9 l or
0.4 l≤d≤0.9 l or
0.6 l≤d≤0.9 l or
0.8 l≤d≤0.9 l.

### Claim 10 (depends on 1)

The system according to claim 1, further comprising a thermal bridge arranged in the axial direction between two sections of the winding and on the coil core and is configured to discharge heat to an external surrounding area.

### Claim 11 (depends on 1)

The system according to claim 1, further comprising a second winding with one or more sections.

### Claim 12 (depends on 11)

The system according to claim 11, wherein the second winding includes two or more sections.

### Claim 13 (depends on 12)

The system according to claim 12, wherein the sections of the second winding are spaced apart from one another.

### Claim 14 (depends on 11)

The system according to claim 11, wherein the sections of the second winding are spaced apart from sections of the first winding.

### Claim 15 (depends on 1)

The system according to claim 1, in which the turns of the sections of the second winding are also wound around the axis of the first winding.

### Claim 16 (depends on 1)

The system according to claim 1, in which the coil core is also the core for the turns of the sections of the second winding.

### Claim 17 (depends on 1)

The system according to claim 1, further comprising a switch in which
either the sections of the first winding or the sections of the second winding can be activated or
the sections of the second winding can be connected between the sections of the first winding.

### Claim 18 (depends on 1)

The system according to claim 1, wherein the first primary axis and the second primary axis are parallel to each other.

### Claim 19 (depends on 18)

The system according to claim 18, wherein the coil core is perpendicular to and intersects the first primary axis, the first primary coil section and the second primary coil section are arranged in a first layer, and the core coil is arranged in a second layer parallel to the first layer.