Coil unit and power supplying system

• US 10,075,022 B2
• Filed: 09/02/2015
• Issued: 09/11/2018
• Est. Priority Date: 03/05/2013
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Kagami, Kazuyoshi, Terayama, Hajime, Tanaka, Shingo
• Primary Examiner(s): Poos, John
• Application Number:
  US14/843,098
• Publication Number:
  US 20150372507A1
• Time in Patent Office: 1,105 Days
• Field of Search: 307104
• CPC Class Codes: H01F 27/24 Magnetic cores
• 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 50/12 of the resonant type

Abstract

A power supplying system magnetically resonates between a primary resonant coil that configures a primary core unit and a secondary resonant coil that configures a secondary core unit for contactlessly supplying the power. The primary and secondary resonant coils are wound around the primary and secondary ferrite cores respectively, and face each other in the direction perpendicular to the axial direction of the primary and secondary resonant coils when supplying the power. The primary and secondary ferrite cores are divided into a plurality of portions along the axial direction of the primary and secondary resonant coils such that a width of the both end portions is shorter than a width of the center portion.

Claims

1. A coil unit used for a power supplying system that, when a pair of coils is separately disposed in a direction perpendicular to an axial direction of the coils, contactlessly supplies power from one coil to the other coil, the coil unit comprising:

a flat panel-like core; and

the pair of coils wound around the core,

wherein the core is divided, along the axial direction of the coils, into at least three portions, with gaps therebetween, and

wherein the core is divided to form two end portions, parallel to the axial direction of the coils and at opposite ends of the core, such that a width of at least one of both end portions, perpendicular to the axial direction of the coils, is smaller than a width another portion of the core different from the two end portions.

2. A power supplying system comprising the pair of the coil units described in claim 1, configured to perform contactless power supplying between the pair of the coil units.