Contactless Power Supply Mechanism and Secondary Coil for Contactless Power Supply Mechanism

• US 20150102688A1
• Filed: 10/02/2014
• Published: 04/16/2015
• Est. Priority Date: 10/10/2013
• Status: Active Grant

• Current Assignee: Hosiden Corporation
• Original Assignee: Hosiden Corporation
• Inventors: Sato, Eiji, Ema, Hiroshi
• Granted Patent: US 9,748,038 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 30/16 Toroidal transformers
• 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

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.

Claims

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.

2. The contactless power supply mechanism according to claim 1, 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.

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

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

5. A secondary coil for a contactless power supply mechanism, comprising:

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

wherein 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.