CONTACTLESS POWER TRANSFER DEVICE FOR MOVING OBJECT

• US 20130320759A1
• Filed: 02/20/2012
• Published: 12/05/2013
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: Technova, Inc. (Aisin Corp.), National University Corporation Saitama University
• Original Assignee: Technova, Inc. (Aisin Corp.), National University Corporation Saitama University
• Inventors: Abe, Shigeru, Yasuda, Tomio, Suzuki, Akira
• Granted Patent: US 8,963,489 B2
• Time in Patent Office: Days
• US Class Current: 307/10.1
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/622 by satellite navigation
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• 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 53/126 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 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• 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: H01F 27/28 Coils; Windings; Conductive connections
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• 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
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

Provided is a contactless power transfer device for a moving object. Each of a power transmission coil and a power receiving coil comprises an H-shaped core, and first, second and third search coils are installed on a magnetic pole object of the H-shaped core of the power transmission coil. A y-direction positional deviation between the power transmission coil and the power receiving coil is detected using voltages measured at the first and second search coils, and an x-direction positional deviation is detected using voltages measured at the third search coils.

Claims

1. A contactless power transfer device for a moving object, in which a power transmission coil connected to a high-frequency power source is installed on the ground, a power receiving coil facing the power transmission coil with a gap in between is installed in the moving object, and power is transferred from the power transmission coil to the power receiving coil, wherein

each of the power transmission coil and the power receiving coil has an H-shaped core, core portions in parallel with each other in the core form magnetic poles, and a core portion that connects between the magnetic poles facing each other forms a wire-wound portion around which a wire is wound,

the power receiving coil is installed in the moving object so that the core portions in parallel with each other are perpendicular to a front-back direction of the moving object,

in the H-shaped core of the power transmission coil or the power receiving coil, at least one of the magnetic poles includes a first search coil that intersects a magnetic flux proceeding toward one end of the magnetic pole from the wire-wound portion and a magnetic flux proceeding in the opposite direction and a second search coil that intersects a magnetic flux proceeding toward the other end of the magnetic pole from the wire-wound portion and a magnetic flux proceeding in the opposite direction, and

the contactless power transfer device for a moving object further includes a power transferable range identification unit that uses a voltage detected by the first search coil or the second search coil to identify whether the power transmission coil and the power receiving coil are located inside the power transferable range.

2. The contactless power transfer device for a moving object according to claim 1, wherein

the H-shaped core of the power transmission coil or the power receiving coil further includes a third search coil that intersects a magnetic flux proceeding straight in the magnetic pole in an extending direction of the wire-wound portion and a magnetic flux proceeding in the opposite direction, and

the power transferable range identification unit identifies whether the power transmission coil and the power receiving coil are located inside the power transferable range by using a voltage detected by the third search coil.

3. The contactless power transfer device for a moving object according to claim 1, further comprising:

a primary side capacitor that is connected in series between the power transmission coil and the high-frequency power source; and

a secondary side resonant capacitor that is connected in parallel with the power receiving coil,

wherein when a primary voltage, which is an output voltage of the high-frequency power source, is defined as VIN, a secondary voltage applied to both ends of the power receiving coil is defined as V2, the number of windings of the power transmission coil is defined as N1, and the number of windings of the power receiving coil is defined as N2, the power transferable range identification unit identifies whether the power transmission coil and the power receiving coil are located inside the power transferable range by using a value of b represented by b=(VIN/V2)(N2/N1).

4. The contactless power transfer device for a moving object according to claim 1, wherein the first search coil and the second search coil are wounded around a circumference of the magnetic pole so that the magnetic pole is included inside the coils.

5. The contactless power transfer device for a moving object according to claim 2, wherein the third search coil is arranged on surfaces of the magnetic pole so that a surface of the magnetic pole, which extends in an extending direction of the wire-wound portion, and a side surface of the magnetic pole, which is perpendicular to the extending direction, are included inside the coil.

6. The contactless power transfer device for a moving object according to claim 2, wherein

in the H-shaped core of the power transmission coil or the power receiving coil, the magnetic pole includes two cores with a gap in between,

the first search coil and the second search coil are wounded around circumferences of the two cores so that the two cores are included inside the coils, and

the third search coil is wound around a core member that connects the gap between the two cores.

7. The contactless power transfer device for a moving object according to claim 1, wherein the power transferable range identification unit provides information of a moving direction for the power transmission coil and the power receiving coil to enter the power transferable range when the power transmission coil and the power receiving coil are not located inside the power transferable range.

8. The contactless power transfer device for a moving object according to claim 7, wherein

the power transferable range identification unit is provided in a vehicle, and

the information of a moving direction provided from the power transferable range identification unit is displayed on a display screen of a car navigation system installed in the vehicle.