Foreign-matter-removing device, ground equipment for wireless power-supplying system, and wireless power-supplying system

• US 9,902,279 B2
• Filed: 10/28/2016
• Issued: 02/27/2018
• Est. Priority Date: 06/30/2014
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Araki, Jun, Niizuma, Motonao, Tokura, Susumu
• Primary Examiner(s): CAVALLARI-SEE, DANIEL
• Application Number:
  US15/337,036
• Publication Number:
  US 20170043672A1
• Time in Patent Office: 487 Days
• 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 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/302 Cooling of charging equipment
• CPC Class Codes: B60M 7/003 for vehicles using stored power (e.g. charging stations)
• CPC Class Codes: B60S 1/482 combined with the operation of windscreen wipers
• CPC Class Codes: B60S 1/52 Arrangement of nozzles; Liquid spreading meansnozzles per se B05B
• CPC Class Codes: B60S 1/56 specially adapted for cleaning other parts or devices than front windows or windscreens rear-view mirror arrangements mounted on vehicle exterior including cleaning devices B60R1/0602
• 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-matter-removing device for a coil device includes a liquid-jetting unit that washes away a foreign matter, which is present in an area through which a magnetic field generated in wireless supply of power using magnetic coupling of a receiving-side pad and a transmitting-side pad passes, by a jet of liquid.

Claims

1. A foreign-matter-removing device for a wireless power-supplying system that supplies power from a power-transmitting coil to a power-receiving coil in a wireless manner, the foreign-matter-removing device comprising:

a flexible sheet that is movable along a top surface of a transmitting-side pad containing the power-transmitting coil;

a ring-shaped coil that is disposed in the transmitting-side pad and generates a single-phase alternating current from an alternating magnetic field of the power-transmitting coil;

a sheet-moving device that is driven by a single-phase alternating current and moves the sheet along the top surface of the transmitting-side pad; and

a current supply control device that supplies the single-phase alternating current generated in the ring-shaped coil to the sheet-moving device and controls the sheet-moving device.

2. The foreign-matter-removing device for a wireless power-supplying system according to claim 1, further comprising a foreign matter detector that detects a foreign matter located on the top surface of the transmitting-side pad,

wherein the current supply control device causes the sheet-moving device to operate when the foreign matter is detected by the foreign matter detector.

3. The foreign-matter-removing device for a wireless power-supplying system according to claim 2, wherein the foreign matter detector detects a variation in voltage or impedance of the power-transmitting coil, a variation in a magnetic field in the transmitting-side pad, or a variation in temperature due to emission of heat from the foreign matter.

4. The foreign-matter-removing device for a wireless power-supplying system according to claim 1, wherein the sheet-moving device includes:

a forward winding roll that is located outside one end of the transmitting-side pad and winds the sheet in a forward winding direction;

a reverse winding roll that is located outside the other end of the transmitting-side pad and winds the sheet in a reverse winding direction; and

a forward winding motor that rotationally drives the forward winding roll in the forward winding direction with the single-phase alternating current.

5. The foreign-matter-removing device for a wireless power-supplying system according to claim 4, further comprising a reverse winding motor that rotationally drives the reverse winding roll in the reverse winding direction with the single-phase alternating current,

wherein the current supply control device alternately rotationally drives the forward winding motor and the reverse winding motor.

6. The foreign-matter-removing device for a wireless power-supplying system according to claim 1, wherein the sheet-moving device includes:

a downstream roll that is located outside one end of the transmitting-side pad;

an upstream roll that is located outside the other end of the transmitting-side pad; and

a driving motor that rotationally drives the downstream roll or the upstream roll with the single-phase alternating current, and

the sheet is spanned between the downstream roll and the upstream roll in an endless manner.

7. The foreign-matter-removing device for a wireless power-supplying system according to claim 1, wherein the sheet has an adhesive matter, concave-convex portions, corrugated grooves, or hooks on a surface thereof such that the foreign matter hardly slides.