WIRELESS POWER SUPPLY SYSTEM

• US 20140035386A1
• Filed: 04/02/2012
• Published: 02/06/2014
• Est. Priority Date: 04/11/2011
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hatanaka, Takezo, Tsuda, Hisashi
• Application Number:
  US14/009,966
• Publication Number:
  US 20140035386A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power supply system transmits power as magnetic field energy from a power supplying resonance coil to a power receiving resonance coil by resonating the power supplying resonance coil and the power receiving resonance coil. The coil diameter of the power receiving resonance coil is set smaller than the coil diameter of the power supplying resonance coil. Then, electromagnetic coupling between the power supplying resonance coil and the power receiving resonance coil is maintained in a stable state, and a space region where power can be transmitted in a state wherein power transmission efficiency is stabilized is expanded.

Claims

1. A wireless power supply system configured to transmit power as magnetic field energy from a power supplying resonance coil to a power receiving resonance coil by resonating the power supplying resonance coil with the power receiving resonance coil, wherein

a coil diameter of the power receiving resonance coil is made smaller than a coil diameter of the power supplying resonance coil.

2. The wireless power supply system according to claim 1, wherein a ratio of the coil diameter of the power supplying resonance coil and the coil diameter of the power receiving resonance coil falls within a range of 100:

7 to 100;

15.

3. The wireless power supply system according to claim 1, comprising:

a power supply unit configured to supply power which is an alternating current;

a power supplying coil connected to the power supply unit and is configured to supply the power to the power supplying resonance coil by means of electromagnetic induction;

a power receiving coil to which the power is supplied from the power receiving resonance coil by means of the electromagnetic induction; and

a power supplying/receiving unit connected to the power receiving coil.

5. The wireless power supply system according to claim 2, comprising:

a power supply unit configured to supply power which is an alternating current;

a power supplying coil connected to the power supply unit and is configured to supply the power to the power supplying resonance coil by means of electromagnetic induction;

a power receiving coil to which the power is supplied from the power receiving resonance coil by means of the electromagnetic induction; and

a power supplying/receiving unit connected to the power receiving coil.

4. A wireless power-supply method which transmits power as magnetic field energy from a power supplying resonance coil to a power receiving resonance coil by resonating the power supplying resonance coil with the power receiving resonance coil, wherein

a coil diameter of the power receiving resonance coil is made smaller than a coil diameter of the power supplying resonance coil.