Wireless power transmission system

• US 9,124,141 B2
• Filed: 06/25/2010
• Issued: 09/01/2015
• Est. Priority Date: 06/26/2009
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Amma, Kenichi, Yamamoto, Katuhito, Fuse, Yoshiharu, Kimura, Tomohisa, Osawa, Mamoru, Takasugi, Hidenori
• Primary Examiner(s): CAVALLARI, DANIEL J
• Application Number:
  US13/379,772
• Publication Number:
  US 20120126631A1
• Time in Patent Office: 1,894 Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/34 Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles positioning means for charging devices using inductive energy transfer B60L53/38
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

It is desired to provide a wireless power transmission system which it is possible to more surely prevent the leakage of a microwave. A wireless power transmission system includes: a power transmission antenna configured to output a microwave from an output plane; a power reception antenna arranged in a position opposing to said output plane of said power transmission antenna in power transmission and configured to receive the microwave outputted from said power transmission antenna by an input plane; and a shield section configured to electromagnetically shield a space between said power transmission antenna and said power reception antenna from an external space by a plurality of outer circumference coil springs provided in an area which surrounds said output plane of said power transmission antenna. The coil spring bends along a convex section compared with a wire member when there is the convex section in a hit part. Therefore, good electromagnetic wave shield efficiency is obtained.

Claims

1. A wireless power transmission system comprising:

a power transmission antenna configured to output a microwave from an output plane;

a power reception antenna arranged in a position opposing to said output plane of said power transmission antenna in power transmission and configured to receive the microwave outputted from said power transmission antenna by an input plane; and

a shield section configured to electromagnetically shield a space between said power transmission antenna and said power reception antenna from an external space by a plurality of outer circumference coil springs provided in an area which surrounds said output plane of said power transmission antenna.

2. The wireless power transmission system according to claim 1, wherein a length of each of said plurality of outer circumference coil springs is longer than a distance between said power transmission antenna and said power reception antenna in the power transmission.

3. The wireless power transmission system according to claim 1, wherein a pitch between corresponding portions of each of said plurality of outer circumference coil springs is equal to or less than 1/50 of a wavelength of said microwave.

4. The wireless power transmission system according to claim 1, wherein said plurality of outer circumference coil springs extend toward said power reception antenna from said power transmission antenna while inclining toward an external direction from said space.

5. The wireless power transmission system according to claim 1, further comprising:

a plurality of inner circumference coil springs connected at one ends in an inner area than said plurality of outer circumference coil springs to surround said output plane of said power transmission antenna.

6. The wireless power transmission system according to claim 5, wherein said plurality of outer circumference coil springs extend toward said power reception antenna from said power transmission antenna while inclining toward the external direction from said space.

7. The wireless power transmission system according to claim 6, wherein said plurality of inner circumference coil springs extend toward said power reception antenna from said power transmission antenna while inclining toward an inner direction from said space.

8. A wireless power transmission system comprising:

a power transmission antenna configured to output a microwave from an output plane; and

a shield section configured to electromagnetically shield from an external space, an inner space between said power transmission antenna and a power reception antenna which is arranged in a position opposing to said output plane of said power transmission antenna in power transmission and which receives the microwave outputted from said power transmission antenna by an input plane, by said plurality of outer circumference coil springs in the area surrounding said output plane of said power transmission antenna at one ends.

9. A wireless power transmission system comprising:

a power reception antenna arranged in a position opposing to an output plane of a power transmission antenna which outputs a microwave from said output plane in power transmission, to receive the microwave outputted from said power transmission antenna by an input plane; and

a shield section configured to electromagnetically shields from an external space, an inner space between said power transmission antenna and said power reception antenna by a plurality of outer circumference coil springs attached to an area surrounding said input plane of said power reception antenna at one ends.