Power transmission system, foreign object detection device, and coil device

• US 10,608,477 B2
• Filed: 01/14/2016
• Issued: 03/31/2020
• Est. Priority Date: 01/19/2015
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Asano, Atsushi, Furiya, Kentarou, Araki, Jun, Goto, Masahiko
• Primary Examiner(s): Kessie, Daniel
• Application Number:
  US15/543,055
• Publication Number:
  US 20180026482A1
• Time in Patent Office: 1,538 Days
• Field of Search: None
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• 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 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 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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

Abstract

A foreign object detection device for a coil device including a second coil to transmit power to a first coil wirelessly or receive power from the first coil wirelessly including: a foreign object detection coil configured to be located between the first coil and the second coil; and a cover configured to cover an upper portion of the foreign object detection coil, wherein a top surface of the cover includes at least one inclined surface inclined relative to a coil plane of the second coil, and the inclined surface is inclined downward from a low sensitivity region where detection sensitivity of the foreign object detection coil is relatively lower to a high sensitivity region where the detection sensitivity of the foreign object detection coil is relatively higher.

Claims

1. A foreign object detection device for a coil device including a second coil to transmit power to a first coil wirelessly or receive power from the first coil wirelessly, the foreign object detection device comprising:

a foreign object detection coil configured to be located between the first coil and the second coil; and

a cover configured to cover an upper portion of the foreign object detection coil, wherein a top surface of the cover includes at least one inclined surface inclined relative to a coil plane of the second coil, the inclined surface is inclined downward from a low sensitivity region where detection sensitivity of the foreign object detection coil is relatively lower to a high sensitivity region where the detection sensitivity of the foreign object detection coil is relatively higher, the foreign object detection coil includes a detection loop that is a conductive wire of a loop shape, and the low sensitivity region overlaps the conductive wire when viewed from a direction of a center axis of the detection loop and the high sensitivity region overlaps an inner portion surrounded by the detection loop when viewed from the direction of the center axis of the detection loop and wherein a lower edge of the inclined surface overlaps the inner portion surrounded by the detection loop when viewed from the direction of a center axis of the detection loop, and a top edge of the inclined surface overlaps the conductive wire of the detection loop when viewed from the direction of the center axis of the detection loop.

2. The foreign object detection device according to claim 1, wherein

the top surface of the cover includes an end inclined surface inclined downward and extending to an end of the top surface.

3. The foreign object detection device according to claim 1, wherein

the at least one inclined surface includes a plurality of inclined surfaces of directions different from each other.

4. The foreign object detection device according to claim 1, wherein

the foreign object detection coil is disposed in parallel to the inclined surface.

5. The foreign object detection device according to claim 1, further comprising:

a vibration device configured to vibrate the cover.

6. A coil device including the foreign object detection device according to claim 1 and the second coil,

wherein the cover further covers the second coil.

7. The foreign object detection device according to claim 4, wherein

the foreign object detection coil is inclined relative to the coil plane of the second coil.