MAGNETIC CIRCUIT, POWER-SUPPLYING DEVICE AND POWER-RECEIVING DEVICE FOR NON-CONTACT CHARGING APPARATUS, AND NON-CONTACT CHARGING APPARATUS

• US 20120319647A1
• Filed: 02/07/2011
• Published: 12/20/2012
• Est. Priority Date: 02/05/2010
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Metals (Thailand) Ltd.
• Inventors: Itabashi, Hiromitsu, Moriyama, Yoshiyuki
• Granted Patent: US 9,143,041 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 2003/103 Magnetic circuits with permanent magnets
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02M 3/33553 with galvanic isolation between input and output of both the power stage and the feedback loop

Abstract

A magnetic circuit for a non-contact charging apparatus comprising a coil, a coil yoke disposed on the rear surface side of the coil, and a magnetic attraction means disposed in a hole of the coil yoke with a magnetic gap in plane and/or thickness directions.

Claims

1. A magnetic circuit for a non-contact charging apparatus, comprising a coil, a coil yoke disposed on the rear surface side of said coil, and a magnetic attraction means disposed in a hole of said coil yoke with a magnetic gap in plane and/or thickness directions.

2. The magnetic circuit for a non-contact charging apparatus according to claim 1, wherein said coil yoke has a doughnut plate shape having a center hole, and wherein said magnetic attraction means is coaxially disposed in the center hole of said coil yoke.

3. The magnetic circuit for a non-contact charging apparatus according to claim 1, wherein a front surface of said magnetic attraction means and a front surface of said coil have the same height.

4. The magnetic circuit for a non-contact charging apparatus according to claim 1, wherein at least part of said magnetic attraction means is disposed in the center hole of said coil yoke when viewed in a plane direction.

5. The magnetic circuit for a non-contact charging apparatus according to claim 1, wherein said coil yoke is constituted by one or more roll-quenched, soft-magnetic alloy sheets each having a thickness of 100 μ

m or less, the total thickness of said soft-magnetic alloy sheets being 200 μ

m or less.

6. The magnetic circuit for a non-contact charging apparatus according to claim 1, wherein said magnetic attraction means comprises a disc-shaped permanent magnet, and a circular, cap-shaped, magnetic yoke member having a recess receiving said disc-shaped permanent magnet, said disc-shaped permanent magnet being positioned on the front surface side.

7. A power-supplying device for a non-contact charging apparatus, comprising the magnetic circuit recited in claim 1.

8. A power-receiving device for a non-contact charging apparatus, comprising the magnetic circuit recited in claim 1.

9. A non-contact charging apparatus comprising the power-supplying device recited in claim 7.

10. A non-contact charging apparatus comprising the power-receiving device recited in claim 8.