Power Transfer Apparatus

• US 20100244582A1
• Filed: 03/30/2010
• Published: 09/30/2010
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yoshikawa, Hiroyasu
• Granted Patent: US 8,378,525 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A power transfer apparatus includes: a magnetic resonance coil for transferring magnetic energy by magnetically resonating with an external coil; a power receiving unit for picking up, as electrical power, the magnetic energy that the magnetic resonance coil receives from the external coil; and a magnetic body arranged on a side of the magnetic resonance coil opposite a transfer side of the magnetic energy of the magnetic resonance coil.

Claims

1. A power transfer apparatus comprising:

a magnetic resonance coil for transferring magnetic energy by magnetically resonating with an external coil;

a power receiving unit for picking up, as electrical power, the magnetic energy that the magnetic resonance coil receives from the external coil; and

a magnetic body arranged on a side of the magnetic resonance coil opposite a transfer side of the magnetic energy of the magnetic resonance coil.

2. The power transfer apparatus according to claim 1, wherein the power receiving unit is in electromagnetic induction with the magnetic resonance coil and is arranged between the magnetic body and the magnetic resonance coil.

3. The power transfer apparatus according to claim 1, wherein the power receiving unit is in electromagnetic induction with the magnetic resonance coil and is substantially coplanar with the magnetic resonance coil.

4. The power transfer apparatus according to claim 3, wherein the power receiving unit is in electromagnetic induction with the magnetic resonance coil and is arranged inside the curvature of the magnetic resonance coil.

9. The power transfer apparatus according to one of claims 1-5, wherein the magnetic body comprises a plurality of bars extending radially and positioned parallel to the magnetic resonance coil.

10. The power transfer apparatus according to one of claims 1 through 5, further comprising a ferrite core arranged in the center of the magnetic body and extending substantially perpendicular to the magnetic resonance coil wherein the magnetic body includes a magnetic sheet disk extending parallel to the magnetic resonance coil.

11. The power transfer apparatus according to claim 10, wherein at least one of the magnetic body or the ferrite core has a magnetic portion segmented with insulators.

5. A power transfer apparatus comprising:

a magnetic resonance coil for transferring magnetic energy by magnetically resonating with an external coil;

a power transmitting unit for supplying electrical power as the magnetic energy that the magnetic resonance coil transmits to the external coil; and

a magnetic body arranged on a side of the magnetic resonance coil opposite a transfer side of the magnetic energy of the magnetic resonance coil.

6. The power transfer apparatus according to claim 5, wherein the power transmitting unit is in electromagnetic induction with the magnetic resonance coil and is arranged between the magnetic body and the magnetic resonance coil.

7. The power transfer apparatus according to claim 5, wherein the power transmitting unit is in electromagnetic induction with the magnetic resonance coil and is substantially co-planar with the magnetic resonance coil.

8. The power transfer apparatus according to claim 7, wherein the power transmitting unit is in electromagnetic induction with the magnetic resonance coil and is arranged inside the curvature of the magnetic resonance coil.