Contactless power supply mechanism and secondary coil for contactless power supply mechanism

Patent metadata

Field	Value
Publication number	US-9748038-B2
Application number	US-201414504986-A
Country	US
Kind code	B2
Filing date	Oct 2, 2014
Priority date	Oct 10, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

In a contactless power supply mechanism, a power receiving unit for supplying power to an electric device includes a secondary coil and a power supplying unit for supplying power to the power receiving unit includes a primary coil. The primary coil includes a primary core formed of magnetic material and a length of winding wire wounded around the primary core. The secondary coil includes a bar-shaped secondary core formed of magnetic material, a length of winding wire wounded around the secondary core and a magnetic sheet attached to at least one of end faces of the secondary core. The magnetic sheet includes a close-contact portion placed in close-contact with the end face of the secondary core and a curved portion which extends outwards from the close-contact portion beyond an outer edge of the end face and whose normal line has a portion un-parallel with an axial direction of the secondary core.

First claim

The invention claimed is:

1. A contactless power supply mechanism comprising:
a power receiving unit having a secondary coil and configured to supply power to an electric device; and
a power supplying unit having a primary coil and configured to supply power to the power receiving unit;
wherein the primary coil includes a primary core formed of magnetic material and a length of winding wire formed of conductive material and wound around the primary core;
the secondary coil includes a bar-shaped secondary core formed of magnetic material, a length of winding wire formed of conductive material and wound around the secondary core and a magnetic sheet attached to at least one of end faces of the secondary core; and
the magnetic sheet includes a close-contact portion placed in close-contact with the end face of the secondary core and a curved portion which extends outwards from the close-contact portion beyond an outer edge of the end face and whose normal line has a portion un-parallel with an axial direction of the secondary core,
wherein:
the primary core includes a pair of opposing portions configured to have respective axes thereof parallel with each other and forming a gap therebetween;
the secondary coil, under a power supply state, is disposed between the pair of opposing portions; and
the magnetic sheet is attached to both of the end faces of the secondary core.

2. The contactless power supply mechanism according to claim 1 , wherein the curved portion has an arcuate shape in its lateral cross section.

Assignees

• Hosiden Corp

Inventors

• Sato Eiji
• Ema Hiroshi

Classifications

• H01F27/38 Primary

  Auxiliary core members; Auxiliary coils or windings · CPC title

• H02J50/10 Primary

  using inductive coupling · CPC title

• H01F30/16

  Toroidal transformers · CPC title

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H02J17/00

  Electricity · mapped topic