WIRELESS POWER-SUPPLY SYSTEM

• US 20140035385A1
• Filed: 02/03/2012
• Published: 02/06/2014
• Est. Priority Date: 02/04/2011
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Hatanaka, Takezo
• Granted Patent: US 9,461,506 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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
• 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 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The purpose of the present invention is to provide a wireless power-supply system using magnetic resonance, which is different from the conventional point of view. In a wireless power-supply system (101), the positional relationship (distance C) between a power-supply resonator (102) and a power-receiving resonator (103) denotes the power-supply range (F). In the power-supply range (F), the electric power transmitted as magnetic energy by resonating the power supply resonator (102) and the power receiving resonator (103) is more than the predetermined effective power. Therefore, the predetermined effective power can be transmitted only in the power-supply range (F) that maintains the positional relationship. On the other hand, when the power-receiving resonator (103) deviates from the power-supply range (F), the electric power cannot be transmitted.

Claims

1. A wireless power-supply system, wherein a positional relation between a power-supplying resonator and a power-receiving resonator is set to a power supply range in which power transmitted in the form of electromagnetic energy by having the power-supplying resonator and the power-receiving resonator resonating with each other yields predetermined effective power or more.

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

a power supply unit configured to supply power;

the power-supplying resonator configured to transmit the power supplied from the power supply unit in the form of electromagnetic energy;

the power-receiving resonator having a same resonance frequency as that of the power-supplying resonator, which is configured to receive the electromagnetic energy transmitted from the power-supplying resonator in the form of power;

a power supplying/receiving unit configured to operate when the power received by and output from the power-receiving resonator is the predetermined effective power or more;

wherein the positional relation between the power-supplying resonator and the power-receiving resonator is such that, at the resonance frequency band, a rate of power supplied to the power-supplying resonator relative to the power output to the power supplying/receiving unit is a rate that yields effective power or more.

3. The wireless power-supply system according to claim 2, wherein:

the power-supplying resonator includes a power-supplying coil connected to the power supply unit and a power-supply end resonance coil; and

the power-receiving resonator includes a power-receiving coil connected to the power supplying/receiving unit and a power-reception end resonance coil.

4. The wireless power-supply system according to claim 3, wherein:

a first distance between the power-supplying coil and the power-supply end resonance coil and/or a second distance between the power-reception end resonance coil and the power-receiving coil is freely settable.

5. A wireless power-supply method, comprising setting of a positional relation between a power-supplying resonator and a power-receiving resonator to a power supply range in which power transmitted in the form of electromagnetic energy by having the power-supplying resonator and the power-receiving resonator resonating with each other yields a predetermined effective power or more.