Magnetic element for wireless power transmission and power supply device

• US 9,390,849 B2
• Filed: 03/02/2011
• Issued: 07/12/2016
• Est. Priority Date: 03/09/2010
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hatanaka, Takezo, Honjo, Mitsuru, Tanaka, Takeshi, Inoue, Masami
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Stables, David M
• Application Number:
  US13/583,525
• Publication Number:
  US 20130002041A1
• Time in Patent Office: 1,959 Days
• Field of Search: 307/104
• US Class Current: 1/1
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

In the disclosed magnetic element (1) for wireless power transmission, in a cross section that matches the direction of magnetic coupling, a conductor section (2) and a magnetic material section (3) that abuts the conductor section (2) are disposed in parallel in a direction perpendicular to the direction of magnetic coupling, and one of either the conductor section (2) or the magnetic material section (3) has a protruding region (61) that protrudes in the direction of magnetic coupling more than the other does.

Claims

1. A magnetic element for wireless power transmission, which generates an induced electromotive force by magnetic coupling, wherein:

in a cross section in a direction of the magnetic coupling, alternating conductor sections adapted to conduct an alternating current and magnetic material sections are arranged in parallel in a direction perpendicular to the direction of the magnetic coupling, wherein the conductor sections and the magnetic material sections are spiraled from an inner circumference side to an outer circumference side; and

each of the conductor sections has at least one region protruding from the magnetic material section in the direction of the magnetic coupling, or each of the magnetic material sections has at least one region protruding from the conductor section in the direction of the magnetic coupling.

2. The magnetic element for wireless power transmission according to claim 1, wherein the one or more protruding regions are arranged on both sides of the magnetic element relative to the direction of the magnetic coupling.

3. The magnetic element for wireless power transmission according to claim 2, wherein the one or more protruding regions are provided throughout the entire magnetic element in a direction of aligning the conductor sections.

4. The magnetic element for wireless power transmission according to claim 3, wherein the magnetic material section is formed by a soft magnetism substance.

5. The magnetic element for wireless power transmission according to claim 4, wherein the soft magnetism substance is a metal magnetic substance.

6. The magnetic element for wireless power transmission according to claim 5, wherein the metal magnetic substance is an amorphous magnetic substance.

7. The magnetic element for wireless power transmission according to claim 4, wherein the conductor sections and the magnetic material section are combined so that the conductor sections and the magnetic material section are at least partially integrated with each other while being electrically insulated.

8. The magnetic element for wireless power transmission according to claim 7, wherein the conductor sections have coating made of an electric insulator, and the magnetic material section is bonded with the coating.

9. The magnetic element for wireless power transmission according to claim 1, wherein the one or more protruding regions are provided throughout the entire magnetic element in a direction of aligning the conductor sections.

10. The magnetic element for wireless power transmission according to claim 1, wherein the magnetic material section is made of an amorphous magnetic substance.

11. The magnetic element for wireless power transmission according to claim 1, wherein the conductor sections and the magnetic material section are combined so that the conductor sections and the magnetic material section are integrated with each other while being electrically insulated.

12. A power supply device comprising a plurality of magnetic elements according to claim 1, for wireless power transmission, wherein the magnetic elements for wireless power transmission are arranged so as to be flush with one another.

13. A magnetic element for wireless power transmission, comprising:

a pair of conductor sections;

a magnetic material section arranged between the pair of conductor sections in parallel to the conductor sections so as to extend along the length of the conductor section in a direction perpendicular to the direction of the magnetic coupling;

wherein the conductor section and the magnetic material section are spiraled at equal intervals from an inner circumference side to an outer circumference side, and

wherein the conductor section has a region at a width directional end portion protruding from the width directional end portion of the magnetic material section or the magnetic material section has a region at a width directional end portion protruding from the width directional end portion of the conductor section.

14. The magnetic element for wireless power transmission according to claim 13, wherein the conductor section and the magnetic material section are combined so that the conductor section and the magnetic material section are at least partially integrated with each other while being electrically insulated.

15. The magnetic element for wireless power transmission according to claim 14, wherein the conductor section has coating made of an electric insulator and the magnetic material section is bonded with the coating.