POWER FEEDING COIL UNIT AND WIRELESS POWER TRANSMISSION DEVICE

• US 20150145339A1
• Filed: 11/20/2014
• Published: 05/28/2015
• Est. Priority Date: 11/28/2013
• Status: Active Grant

• Current Assignee: Tdt Corporation
• Original Assignee: TDK Corporation
• Inventors: KAMONO, Takeshi, FUKUZAWA, Narutoshi, MATSUURA, Toshinori, NISHIYAMA, Tetsuya, CHIYO, Noritaka
• Granted Patent: US 9,558,882 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• 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 27/24 Magnetic cores
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/346 Preventing or reducing leakage fields using magnetic shields H01F27/36; using auxiliary windings H01F27/38
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 27/42 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 Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• CPC Class Codes: H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• 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 power feeding coil unit includes a power feeding coil, and an auxiliary coil. The auxiliary coil is arranged not to interlink with a magnetic flux that interlinks with a power receiving coil that is arranged to face the power feeding coil during power feeding. An axial direction of the auxiliary coil is nonparallel to an opposing direction of the power feeding coil and the power receiving coil. A direction of circulation of a magnetic flux generated by the auxiliary coil is opposite to a direction of circulation of a magnetic flux generated by the power feeding coil.

Claims

1. A power feeding coil unit for wirelessly feeding power, comprising:

a power feeding coil; and

an auxiliary coil, wherein

the auxiliary coil is arranged not to interlink with a magnetic flux that interlinks with a power receiving coil that is arranged to face the power feeding coil during power feeding,

an axial direction of the auxiliary coil is nonparallel to an opposing direction of the power feeding coil and the power receiving coil, and

a direction of circulation of a magnetic flux generated by the auxiliary coil is opposite to a direction of circulation of a magnetic flux generated by the power feeding coil.

2. The power feeding coil unit according to claim 1, wherein

the magnetic flux generated by the auxiliary coil does not cancel a magnetic flux that is generated by the power feeding coil and is interlinking with the power receiving coil, and the magnetic flux generated by the auxiliary coil cancels some amount of magnetic flux that is generated by the power feeding coil and is not interlinking with the power receiving coil.

3. The power feeding coil unit according to claim 1, wherein

a magnetic field generated by the auxiliary coil enhances a part of a magnetic field between the power feeding coil and the power receiving coil.

4. The power feeding coil unit according to claim 1, wherein

each of the power feeding coil and the auxiliary coil includes a magnetic core, and

the magnetic core of the auxiliary coil is coupled to the magnetic core of the power feeding coil.

5. The power feeding coil unit according to claim 1, wherein

the auxiliary coil is located on the opposite to a side of the power feeding coil facing the power receiving coil.

6. The power feeding coil unit according to claim 5, wherein

the auxiliary coil is arranged so that part or all of the auxiliary coil overlaps the power feeding coil when viewed from the opposing direction of the power feeding coil and the power receiving coil.

7. The power feeding coil unit according to claim 1, wherein

an axis of the auxiliary coil is substantially perpendicular to the opposing direction of the power feeding coil and the power receiving coil.

8. The power feeding coil unit according to claim 1, wherein

the power feeding coil comprises a first power feeding coil and a second power feeding coil that are apposed, and

a magnetic path interlinking the first power feeding coil and the second power feeding coil is generated by a magnetic field of the first power feeding coil and a magnetic field of the second power feeding coil.

9. The power feeding coil unit according to claim 8, wherein

at least part of the magnetic flux generated by the auxiliary coil interlinks with the power feeding coil.

10. The power feeding coil unit according to claim 8, further comprising:

an additional coil arranged on the opposite to a side of the power feeding coil facing the power receiving coil, the additional coil being arranged so as to have a center portion located between a center portion of the first power feeding coil and a center portion of the second power feeding coil, wherein

a magnetic path interlinking the first power feeding coil, the second power feeding coil, and the additional coil is generated by a magnetic field of the first power feeding coil, a magnetic field of the second power feeding coil, and a magnetic field of the additional coil.

11. The power feeding coil unit according to claim 1, wherein

the auxiliary coil comprises a first auxiliary coil and a second auxiliary coil, and

the first auxiliary coil and the second auxiliary coil are arranged so that a center portion of the power feeding coil is located between a center portion of the first auxiliary coil and a center portion of the second auxiliary coil.

12. A wireless power transmission device for wirelessly transmitting power, comprising:

the power feeding coil unit according to claim 1, and

a power receiving coil.