Wireless power supply system

• US 9,345,177 B2
• Filed: 07/31/2014
• Issued: 05/17/2016
• Est. Priority Date: 02/06/2012
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Maekawa, Yuji
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US14/447,852
• Publication Number:
  US 20140340035A1
• Time in Patent Office: 656 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• 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 53/37 using optical position determination, e.g. using cameras
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: B60M 7/003 for vehicles using stored power (e.g. charging stations)
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• 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 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• CPC Class Codes: H05K 9/00 Screening of apparatus or components against electric or magnetic fields devices for absorbing radiation from an antenna H01Q17/00
• 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 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles

Abstract

A wireless power supply system that wirelessly supplies electric power from a power-supplying coil to a power-receiving coil is provided with a ground power-supplying device having a power-supplying coil, a vehicle having a power-receiving coil, and a power-supplying and a power-receiving covers that shield leakage magnetic flux by covering the periphery of the power-supplying coil and the power-receiving coil and the periphery of space between the coils.

Claims

1. A wireless power supply system that wirelessly supplies electric power from a power-supplying coil to a power-receiving coil, the system comprising:

a power-supplying device having the power-supplying coil and a power-receiving device having the power-receiving coil,

an inflatable and expandable cover provided at least at one of the power-supplying device and the power-receiving device,

wherein when inflated, the expandable cover shields leakage magnetic flux by covering a periphery of the power-supplying coil and the power-receiving coil and a periphery of space between the coils.

2. The wireless power supply system according to claim 1, wherein

the cover is sealed, and

the wireless power supply system further comprises a gas supply and exhaust mechanism that, when electric power is supplied, inflates the cover by supplying gas to inside of the cover and establishes a shielding state from outside the cover where the inflated cover covers the periphery of the power-supplying coil and the power-receiving coil and the periphery of the space between the coils, and that, when the electric power is not supplied, deflates the cover by exhausting gas from inside the cover and cancels the shielding state.

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

wherein a material is disposed at a portion of the cover located between the power-supplying coil and the power-receiving coil, the material having a higher magnetic permeability than other portions.

4. The wireless power supply system according to claim 1,

wherein the power-receiving device is a vehicle that charges received electric power to a battery and the vehicle is driven by electric power stored in the battery.