Power transmission apparatus

• US 9,558,884 B2
• Filed: 02/18/2014
• Issued: 01/31/2017
• Est. Priority Date: 09/02/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shimokawa, Satoshi, Uchida, Akiyoshi, Kawano, Hiroyasu, Matsui, Kiyoto, Taguchi, Masakazu
• Primary Examiner(s): Johnson, Ryan
• Application Number:
  US14/182,501
• Publication Number:
  US 20140159502A1
• Time in Patent Office: 1,078 Days
• US Class Current: 1/1
• 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 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A power transmission apparatus includes a cover part attached to one of a power transmitter and an electronic apparatus, the power transmitter including a primary-side coil connected to an alternating-current power supply and a primary-side resonant coil configured to receive power from the primary-side coil by electromagnetic induction, the electronic apparatus including a secondary-side coil; and a secondary-side resonant coil disposed in the cover part, and configured to transmit to the secondary-side coil the power received from the primary-side resonant coil by magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil.

Claims

1. A power transmission apparatus comprising:

a cover part attached to one of a power transmitter and an electronic apparatus, the power transmitter including a primary-side coil connected to an alternating-current power supply and a primary-side resonant coil configured to receive power from the primary-side coil by electromagnetic induction, the electronic apparatus including a secondary-side coil;

a secondary-side resonant coil disposed in the cover part, and configured to transmit to the secondary-side coil the power received from the primary-side resonant coil by magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil;

a voltage fluctuation detecting part configured to detect voltage fluctuation occurring in the secondary-side resonant coil; and

a communication part configured to transmit a signal that represents the voltage fluctuation detected by the voltage fluctuation detecting part, wherein

the cover part is attached to the electronic apparatus including the secondary-side coil, and

the communication part transmits the signal that represents the voltage fluctuation.

2. The power transmission apparatus as claimed in claim 1, wherein

a central axis of the secondary-side resonant coil matches a central axis of the secondary-side coil in a state where the cover part is attached to one of the power transmitter and the electronic apparatus.

3. The power transmission apparatus as claimed in claim 1, wherein

the cover part is made of a nonmagnetic material.

4. The power transmission apparatus as claimed in claim 1, wherein

the cover part is made of a nonconductive material.

5. The power transmission apparatus as claimed in claim 1, further comprising:

a magnetic part made of a magnetic material, the magnetic part being disposed on an internal part or an external part of the cover part.

6. The power transmission apparatus as claimed in claim 5, wherein

the magnetic part is disposed on the internal part or the external part of the cover part at a position closer to the secondary-side coil than the secondary-side resonant coil in a state where the cover part is attached to the electronic apparatus.

7. The power transmission apparatus as claimed in claim 5, wherein

the magnetic part includes an opening part.

8. The power transmission apparatus as claimed in claim 7, wherein

a center of the opening part matches a central axis of the secondary-side resonant coil.

9. The power transmission apparatus as claimed in claim 1, wherein

the cover part serves as a jacket of the electronic apparatus.