Power feeding coil unit and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-9515493-B2
Application number	US-201414549094-A
Country	US
Kind code	B2
Filing date	Nov 20, 2014
Priority date	Nov 28, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A power feeding coil unit includes a first power feeding coil and a second power feeding coil that generate a first magnetic flux, a first auxiliary coil that generates a second magnetic flux interlinking with the first power feeding coil, and a second auxiliary coil that generates a third magnetic flux interlinking with the second power feeding coil. An axial direction of the first auxiliary coil is nonparallel to an axial direction of the first power feeding coil, and an axial direction of the second auxiliary coil is nonparallel to an axial direction of the second power feeding coil. A direction of circulation of the second and third magnetic fluxes are opposite to a direction of circulation of the first magnetic flux.

First claim

What is claimed is:

1. A power feeding coil unit for wirelessly feeding power, comprising:
a first power feeding coil and a second power feeding coil that are apposed, the first power feeding coil and the second power feeding coil generate a first magnetic flux;
a first auxiliary coil on a rear side of the first power feeding coil, the first auxiliary coil generates a second magnetic flux interlinking with the first power feeding coil; and
a second auxiliary coil on a rear side of the second power feeding coil, the second auxiliary coil generates a third magnetic flux interlinking with the second power feeding coil, wherein
the first magnetic flux interlinks with the first power feeding coil and the second power feeding coil due to a magnetic field generated by the first power feeding coil and a magnetic field generated by the second power feeding coil,
an axial direction of the first auxiliary coil is nonparallel to an axial direction of the first power feeding coil,
an axial direction of the second auxiliary coil is nonparallel to an axial direction of the second power feeding coil, and
a direction of circulation of the second magnetic flux and the third magnetic flux are opposite to a direction of circulation of the first magnetic flux.

2. The power feeding coil unit according to claim 1 , wherein
each of the first power feeding coil and the second power feeding coil includes a magnetic core, and each of the first auxiliary coil and the second auxiliary coil includes a magnetic core,
the magnetic core of the first power feeding coil is coupled to the magnetic core of the first auxiliary coil, and
the magnetic core of the second power feeding coil is coupled to the magnetic core of the second auxiliary coil.

3. The power feeding coil unit according to claim 1 , wherein
the first auxiliary coil is arranged so that part or all of the first auxiliary coil overlaps the first power feeding coil, and
the second auxiliary coil is arranged so that part or all of the second auxiliary coil overlaps the second power feeding coil.

4. The power feeding coil unit according to claim 1 , wherein
the axial direction of the first auxiliary coil is substantially perpendicular to the axial direction of the first power feeding coil, and
the axial direction of the second auxiliary coil is substantially perpendicular to the axial direction of the second power feeding coil.

5. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 1 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

6. The power feeding coil unit according to claim 2 , wherein
the first auxiliary coil is arranged so that part or all of the first auxiliary coil overlaps the first power feeding coil, and
the second auxiliary coil is arranged so that part or all of the second auxiliary coil overlaps the second power feeding coil.

7. The power feeding coil unit according to claim 2 , wherein
the axial direction of the first auxiliary coil is substantially perpendicular to the axial direction of the first power feeding coil, and
the axial direction of the second auxiliary coil is substantially perpendicular to the axial direction of the second power feeding coil.

8. The power feeding coil unit according to claim 3 , wherein
the axial direction of the first auxiliary coil is substantially perpendicular to the axial direction of the first power feeding coil, and
the axial direction of the second auxiliary coil is substantially perpendicular to the axial direction of the second power feeding coil.

9. The power feeding coil unit according to claim 6 , wherein
the axial direction of the first auxiliary coil is substantially perpendicular to the axial direction of the first power feeding coil, and
the axial direction of the second auxiliary coil is substantially perpendicular to the axial direction of the second power feeding coil.

10. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 2 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

11. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 3 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

12. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 6 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

13. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 4 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

14. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 7 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

15. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 8 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

16. A wireless power transmission device for wirelessly transmitting power, comprising:
the power feeding coil unit according to claim 9 ; and
a power receiving coil that is a helical-shaped coil including a magnetic core and a wire wound around the magnetic core.

Assignees

• Tdk Corp

Inventors

• Chiyo Noritaka
• Kamono Takeshi
• Suzuki Mitsunari

Classifications

• H02J50/70

  involving the reduction of electric, magnetic or electromagnetic leakage fields · CPC title

• H01F3/10

  Composite arrangements of magnetic circuits · CPC title

• H01F27/42

  Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) · CPC title

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F38/00

  Adaptations of transformers or inductances for specific applications or functions · CPC title