WIRELESS POWER SUPPLY SYSTEM

• US 20110316334A1
• Filed: 09/08/2011
• Published: 12/29/2011
• Est. Priority Date: 03/17/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shimokawa, Satoshi
• Granted Patent: US 9,283,894 B2
• Time in Patent Office: Days
• US Class Current: 307/10.1
• CPC Class Codes: B60R 1/07 by electrically powered actuators
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• 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 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A wireless power supply system has a power sending resonance coil, a power receiving resonance coil, and a relay resonance coil. The power sending resonance coil has a predetermined resonance frequency characteristic, and transmits power wirelessly. The power receiving resonance coil has the same resonance frequency characteristic as the power sending resonance coil, and receives power wirelessly with a magnetic field resonance mode generated by synchronization of the resonance frequency. The relay resonance coil has the same resonance frequency characteristic as the power sending resonance coil and the power receiving resonance coil, and relay power from the power sending resonance coil to the power receiving resonance coil wirelessly with the magnetic field resonance mode generated by synchronization of the resonance frequency with them.

Claims

1. A wireless power supply system comprising:

a power sending resonance coil configured to have a resonance frequency characteristic and to transmit power wirelessly;

a power receiving resonance coil configured to have the same resonance frequency characteristic with the power sending resonance coil and to receive power wirelessly under a magnetic field resonance mode generated by synchronization of a resonance frequency;

one or more relay resonance coils configured to have the same resonance frequency characteristic with the power sending resonance coil and the power receiving resonance coil and to relay power from the power sending resonance coil to the power receiving resonance coil wirelessly under the magnetic field resonance mode generated by synchronization of a resonance frequency with them,

wherein

assuming an angle at which a magnetic line extending from the power sending resonance coil and directly going through the power receiving resonance coil crosses a coil axis of the power receiving resonance coil as an crossing angle α

, an angle at which a magnetic line extending from the power sending resonance coil or another relay resonance coil and going through the relay resonance coil crosses a coil axis of the relay resonance coil as an crossing angle β

0, and an angle at which a magnetic line extending from the relay resonance coil and going through the power receiving resonance coil or another relay resonance coil crosses a coil axis of the power receiving resonance coil or the other relay resonance coil as an crossing angle β

1,

the relay resonance coil is placed so as to satisfy 0°

≦

β

0≦

α

≦

90°

, and 0°

≦

β

1≦

α

≦

90°

.

2. The wireless power supply system according to claim 1, wherein the power sending resonance coil and the power receiving resonance coil are placed such that their coil axes are in a crossed, parallel or twisted positional relationship.

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

a posture control apparatus configured to control at least one of the power sending resonance coil, the power receiving resonance coil and the relay resonance coil, and to change a direction of its coil axis.

4. The wireless power supply system according to claim 3, wherein the power receiving resonance coil and the relay resonance oil is provided in an electric door mirror of a car operated by the posture control apparatus, and the power sending resonance coil is provided in an appropriate part of a car body of the car.

5. The wireless power supply system according to claim 1, wherein the power receiving resonance coil is provided in a plurality of electric devices, and the power sending resonance coil is provided in a table on which the plurality of electric devices can be placed, or in a ceiling, floor or wall of a room in which the plurality of electric devices exist.

6. The wireless power supply system according to claim 5, wherein

at least one of the power receiving resonance coil in the plurality of electric devices is also used as the relay resonance coil.

7. The wireless power supply system according to claim 1, wherein the power sending resonance coil and the relay resonance coil are provided in an appropriate part of a car body of a car, and the power receiving resonance coil is provided in a car-exterior imaging apparatus installed on an exterior of the car.

8. The wireless power supply system according to claim 1, wherein the power sending resonance coil, the power receiving resonance coil and the relay resonance coil includes a capacitor.