Non-contact power feeding coil and non-contact power feeding system

• US 10,672,551 B2
• Filed: 03/28/2016
• Issued: 06/02/2020
• Est. Priority Date: 09/24/2015
• Status: Active Grant

• Current Assignee: Fuji Company Limited
• Original Assignee: Fuji Company Limited
• Inventors: Oki, Masayuki, Takikawa, Shinji, Nomura, Takeshi, Jindo, Takahiro
• Primary Examiner(s): Barnie, Rexford N
• Assistant Examiner(s): Ly, Xuan
• Application Number:
  US15/762,397
• Publication Number:
  US 20180262063A1
• Time in Patent Office: 1,527 Days
• Field of Search: 307104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/39 with position-responsive activation of primary coils
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/32 Insulating of coils, windings, or parts thereof
• 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: H05K 13/00 Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
• 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 that configures a non-contact power feeding system is provided. The power feeding coil is provided with a coil through which an AC current of a specific frequency flows, and a core that forms a section of a circulating magnetic path, which is interlinked with the coil. In the coil, a wire having an insulating covering is wound around a conductor, and a covering thickness of the insulating covering is set so that the influence of a proximity effect that occurs at the specific frequency between adjacent portions of the wire is a predetermined amount or less. According to this configuration, it is possible to freely adjust a separation distance between portions of the conductor by altering the covering thickness; and the occurrence of AC loss caused by a proximity effect may be appropriately suppressed.

Claims

1. A non-contact power feeding coil that is used in at least one of a power feeding coil and a power receiving coil that configure a non-contact power feeding system, the non-contact power feeding coil comprising:

a coil through which an AC current of a specific frequency flows; and

a core that forms a section of a circulating magnetic path, which is interlinked with the coil,

wherein in the coil, a wire having an insulating covering is wound around a conductor, and the wire is wound around, in a parallel manner, an opposing intermediate face when the power feeding coil and the power receiving coil oppose one another,

wherein the core has a center leg section that is fitted into a hollow section at the center of the coil, a side leg section that covers an outer peripheral section of the coil, and a bottom face section that covers an end face section on a side that is separated from the opposing intermediate face of the coil,

wherein a plurality of the coils for non-contact power supply are used in a manner of being aligned in a predetermined direction, and

wherein the side leg section of the core covers, among an outer peripheral section of the coil, a partial range that is parallel to the predetermined direction and does not cover a remaining range that intersects the predetermined direction.

2. The non-contact power feeding coil according to claim 1,

wherein a cross-sectional area of the conductor of the wire is based on a coil resistance value, the coil resistance value being obtained by adding a DC resistance value of the coil, and an AC resistance value of the coil which is a resistance increment caused by a skin effect that occurs at the specific frequency.

3. The non-contact power feeding coil according to claim 1,

wherein the conductor is a composite conductor composed of a plurality of wires, or a single conductor composed of a single wire.

4. A non-contact power feeding system comprising:

a power feeding coil provided in a power feeding unit;

an AC power supply circuit that supplies AC power of the specific frequency to the power feeding coil;

a power receiving coil that is provided in a power receiving unit, the power receiving coil electrically coupling with and receiving AC power in a non-contact manner when opposing the power feeding coil; and

a power receiving circuit that converts AC power received by the power receiving coil, generates a drive voltage, and outputs the drive voltage to an electrical load,

wherein the power feeding coil is the non-contact power feeding coil according to claim 1, and

the power receiving coil includes a coil through which an AC current of the specific frequency flows and a core that forms a section of a circulating magnetic path, which is interlinked with the coil, the coil is composed of a plurality of coil blocks in which wires having insulating coverings around conductors are respectively wound, and further includes a bobbin having a main partition section that partitions the coil and the core, and an inter-block partition section that partitions the plurality of coil blocks.

5. The non-contact power feeding system according to claim 4,

wherein an identical number of the power feeding units are provided in a plurality of board production machines that configure a board production line, and the power receiving unit is provided in a moving body that moves in a linear arrangement direction of the plurality of board production machines.