Resonance coil, electric power transmission device, electric power receiving device, and electric power transmission system

• US 9,595,382 B2
• Filed: 02/23/2012
• Issued: 03/14/2017
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: Nagoya Institute of Technology, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nagoya Institute of Technology, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji, Kikuma, Nobuyoshi, Kadoi, Masafumi
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Dhillon, Jagdeep
• Application Number:
  US13/981,937
• Publication Number:
  US 20130320774A1
• Time in Patent Office: 1,846 Days
• Field of Search: 307/104, 307/149, 307/86, 307/82, 307/80, 361/43, 361/56, 455/1, 455/7, 713/313, 713/314, 375/259, 375/295, 733/13, 733/14
• US Class Current: 1/1
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• 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 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A resonance coil includes plural unit coils where directions of magnetic fields which are formed by flowing of electric current are the same, in which the plural unit coils are arranged around a coil center line, and when the resonance coil is seen in a direction of the coil center line, the coil wire that forms the resonance coil is formed so as not to be overlapped.

Claims

1. A resonance coil comprising:

a coil wire that forms a plurality of unit coils, each unit coil producing a magnetic field from current flowing therethrough, directions of each magnetic field produced by each unit coil being parallel to each other, the plurality of unit coils being arranged around a coil center line;

an outer conductor section that is formed with the coil wire, the outer conductor section extending to surround the coil center line and including a first connecting end and a second connecting end;

an inner conductor section that is formed with the coil wire and is arranged within a first region that is surrounded by the outer conductor section, the inner conductor section having a first end that is connected to the first connecting end and a second end that is connected to the second connecting end; and

a plurality of second regions formed in the first region that are each surrounded by a portion of the inner conductor section and a portion of the outer conductor section,

wherein when the resonance coil is seen in a direction of the coil center line, the coil wire is formed so as not to be overlapped, and each unit coil is formed with the portion of the outer conductor section and the portion of the inner conductor section that surround one of the plurality of second regions.

2. The resonance coil according to claim 1, wherein

the outer conductor section is formed by bending the coil wire, and

the inner conductor section is formed by bending the coil wire from the first connecting end and the second connecting end.

3. The resonance coil according to claim 1, wherein

an area which the plurality of second regions occupy is larger than an area of a third region that is surrounded by the first connecting end, the second connecting end, and the inner conductor section.

4. The resonance coil according to claim 1, wherein

the inner conductor section includes a main section that extends from the outer conductor section toward the coil center line, and

the main section extends to a vicinity of the outer conductor section so as to secure insulation properties with the outer conductor section and form the plurality of second regions.

5. The resonance coil according to claim 1, wherein

the inner conductor section includes a main section that extends from the outer conductor section toward the coil center line, and a branch section that extends to branch from the main section and that is formed with the coil wire.

6. The resonance coil according to claim 5, wherein

the outer conductor section includes a first side section in which the first connecting end and the second connecting end are formed, a second side section in which a first end is connected to a first end of the first side section, a third side section in which a first end is connected to a second end of the first side section, and a fourth side section that connects between a second end of the second side section and a second end of the third side section;

the main section extends from the first side section to the fourth side section, and

the inner conductor section includes a first branch section that extends from the main section to the second side section and a second branch section that extends from the main section to the third side section.

10. The resonance coil according to claim 1, wherein

the inner conductor section is plurally formed with a distance in an extending direction of the outer conductor section.

11. The resonance coil according to claim 1, wherein

the coil wire is positioned on an imaginary plane.

12. An electric power transmission device, comprising:

the resonance coil according to claim 1 for electric power transmission that is coupled to a resonance coil for electric power reception that is provided in an electric power receiving device through electromagnetic resonant coupling; and

a coil that is supplied with electric power from an external power supply and that supplies electric power to the resonance coil for electric power transmission through electromagnetic induction.

13. An electric power receiving device, comprising:

the resonance coil according to claim 1 for electric power reception that is coupled to a resonance coil for electric power transmission that is provided in an electric power transmission device through electromagnetic resonant coupling; and

a coil that receives electric power from the resonance coil for electric power reception through electromagnetic induction.

14. An electric power transmission system, comprising:

the electric power transmission device according to claim 12; and

an electric power receiving device including;

the resonance coil for electric power reception including a coil wire that forms a plurality of unit coils, each unit coil producing a magnetic field from current flowing therethrough, directions of each magnetic field produced by each unit coil being parallel to each other, the plurality of unit coils being arranged around a coil center line; and

a coil that receives electric power from the resonance coil for electric power reception through electromagnetic induction,

wherein when the resonance coil for electric power reception is seen in a direction of its coil center line, the resonance coil for electric power reception is formed so as not to be overlapped.

15. The resonance coil according to claim 1, wherein the plurality of unit coils is formed continuously.

7. A resonance coil comprising:

a coil wire that forms a plurality of unit coils, each unit coil producing a magnetic field from current flowing therethrough, directions of each magnetic field produced by each unit coil being parallel to each other, the plurality of unit coils being arranged around a coil center line;

an outer conductor section that is formed with the coil wire, the outer conductor section extending to surround the coil center line and including a first connecting end and a second connecting end;

an inner conductor section that is formed with the coil wire and is arranged within a first region that is surrounded by the outer conductor section, the inner conductor section having a first end that is connected to the first connecting end;

end that is connected to the second connecting end;

a plurality of second regions formed in the first region that are each surrounded by a portion of the inner conductor section and a portion of the outer conductor section;

a third region that is surrounded by the first connecting section, the second connecting section, and the inner conductor section; and

a plurality of fourth regions that are regions other than the third region and that are surrounded by the inner conductor section,

wherein when the resonance coil is seen in a direction of the coil center line, the coil wire is formed so as not to be overlapped, and each unit coil is formed with the portion of the inner conductor section and the portion of the outer conductor section that surround one of the plurality of second regions, or a portion of the inner conductor section that surrounds one of the plurality of fourth regions.

8. The resonance coil according to claim 7, wherein

an area that the plurality of second regions and the plurality of fourth regions occupy is larger than an area that the third region occupies.

9. The resonance coil according to claim 7, wherein

the inner conductor section includes a main section that extends from the outer conductor section toward the coil center line, a branch section that is formed to branch from the main section, and a projecting section that is formed to project from a midsection of the branch section in a length direction.