POWER FEEDING COIL UNIT AND WIRELESS POWER TRANSMISSION DEVICE

• US 20150145343A1
• Filed: 11/20/2014
• Published: 05/28/2015
• Est. Priority Date: 11/28/2013
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: CHIYO, Noritaka, TERASAKI, Yasuhiro, NISHIYAMA, Tetsuya
• Granted Patent: US 9,728,325 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 27/2871 Pancake coils
• 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 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 first and second auxiliary coils located outside of the region defined by a wire of the power feeding coil. The axis of the first auxiliary coil and the axis of the second auxiliary coil are substantially perpendicular to the axis of the power feeding coil. The power feeding coil and the first and second auxiliary coils simultaneously generate respective magnetic fluxes, each of which interlinks the corresponding one of the power feeding coil and the first and second auxiliary coils in a direction from the center to the outside of the power feeding coil unit.

Claims

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

a power feeding coil having a wire wound in a planar shape; and

at least one pair of auxiliary coils, each pair including a first auxiliary coil and a second auxiliary coil, the at least one pair of auxiliary coils being located on a rear side of the power feeding coil and located outside of the region defined by the wire of the power feeding coil when viewed from an axial direction of the power feeding coil, wherein

an axis of the first auxiliary coil and an axis of the second auxiliary coil are nonparallel to an axis of the power feeding coil, and

the power feeding coil, the first auxiliary coil, and the second auxiliary coil simultaneously generate respective magnetic fluxes, each of which interlinks the corresponding one of the power feeding coil, the first auxiliary coil, and the second auxiliary coil in a direction from a center to an outside of the power feeding coil unit.

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

the axis of the first auxiliary coil and the axis of the second auxiliary coil are substantially perpendicular to the axis of the power feeding coil.

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

the power feeding coil further 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 auxiliary coil is coupled to the magnetic core of the power feeding coil, and

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

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

the first auxiliary coil and the second auxiliary coil are arranged so that the power feeding coil is located between the first auxiliary coil and the second auxiliary coil when viewed from the axial direction of the power feeding coil.

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

the at least one pair of auxiliary coils comprises a plurality of pairs of auxiliary coils, each pair including a first auxiliary coil and a second auxiliary coil, and

an imaginary line connecting a center of the first auxiliary coil and a center of the second auxiliary coil in each of the plurality of pairs is nonparallel to an imaginary line connecting a center of the first auxiliary coil and a center of the second auxiliary coil in another of the plurality of pairs.

6. 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.