Power transfer apparatus

• US 8,378,525 B2
• Filed: 03/30/2010
• Issued: 02/19/2013
• Est. Priority Date: 03/31/2009
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yoshikawa, Hiroyasu
• Primary Examiner(s): CAVALLARI, DANIEL J
• Application Number:
  US12/750,672
• Publication Number:
  US 20100244582A1
• Time in Patent Office: 1,057 Days
• Field of Search: 307/104
• 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 a power supplying coil;

a power pickup coil for picking up, as electrical power, the magnetic energy that the magnetic resonance coil receives from the power supplying coil; and

a first magnetic body arranged on a first side of the magnetic resonance coil opposite to a second side of the magnetic resonance coil in which the power pickup coil is located.

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

3. The power transfer apparatus according to claim 1, wherein the power pickup coil is in electromagnetic induction with the magnetic resonance coil and is arranged in a location substantially coplanar with a location of the magnetic resonance coil.

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

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

10. The power transfer apparatus according to claim 1, further comprising a ferrite core arranged in the center of the first magnetic body and extending substantially perpendicular to the magnetic resonance coil wherein the first 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 first magnetic body and 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 a power receiving coil;

a power pickup coil for supplying electrical power as the magnetic energy that the magnetic resonance coil transmits to the power receiving coil; and

a first magnetic body arranged on a first side of the magnetic resonance coil opposite to a second side of the magnetic resonance coil in which the power pickup coil is located.

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

7. The power transfer apparatus according to claim 5, wherein the power pickup coil is in electromagnetic induction with the magnetic resonance coil and is arranged in a location substantially co-planar with a location of the magnetic resonance coil.

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

12. The power transfer apparatus according to claim 5, wherein the first magnetic body comprises a plurality of bars extending radially and positioned parallel to the magnetic resonance coil.

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

14. The power transfer apparatus according to claim 13, wherein at least one of the first magnetic body and the ferrite core has a magnetic portion segmented with insulators.