POWER TRANSMISSION DEVICE, POWER RECEPTION DEVICE AND POWER TRANSFER SYSTEM

• US 20140225454A1
• Filed: 10/12/2011
• Published: 08/14/2014
• Est. Priority Date: 10/12/2011
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Application Number:
  US14/350,229
• Publication Number:
  US 20140225454A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• 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: 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 50/90 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A resonant coil transmits electric power to a power reception unit of a vehicle in a contactless manner. Each of a plurality of electromagnetic induction coils is connected to a power supply unit through a power line, and capable of supplying electric power received from the power supply unit to the resonant coil in a contactless manner. A rail is moving device for moving the resonant coil in a range in which electric power can be supplied from any one of the plurality of electromagnetic induction coils to the resonant coil. The resonant coil moves on the rail in accordance with the positional relation with the power reception unit of the vehicle.

Claims

1. A power transmission device outputting electric power to a power reception device in a contactless manner, said power transmission device comprising:

a first coil for transmitting electric power to said power reception device in a contactless manner;

a plurality of second coils each for supplying electric power to said first coil in a contactless manner, said electric power being received from a power supply; and

a movement device for moving said first coil relative to said plurality of second coils.

2. The power transmission device according to claim 1, wherein said plurality of second coils are formed of one conductive wire.

3. The power transmission device according to claim 1, further comprising a switching unit provided between said plurality of second coils and said power supply, electrically connecting, to said power supply, a coil of said plurality of second coils that is closest to said first coil, and electrically disconnecting at least one remaining coil of said plurality of second coils from said power supply.

4. The power transmission device according to claim 1, further comprising a switching unit provided between said plurality of second coils and said power supply, electrically connecting, to said power supply, a coil of said plurality of second coils that achieves optimum efficiency of power transmission to said power reception device, and electrically disconnecting at least one remaining coil of said plurality of second coils from said power supply.

5. The power transmission device according to claim 1, wherein

said power reception device is mounted in a vehicle, and

said plurality of second coils are arranged in a vehicle front-rear direction in a parking space of said vehicle.

6. The power transmission device according to claim 1, wherein a difference between a natural frequency of said first coil and a natural frequency of a power receiving coil of said power reception device is equal to or less than ±

10% of the natural frequency of said first coil or the natural frequency of said power receiving coil.

7. The power transmission device according to claim 1, wherein a coupling coefficient between said first coil and a power receiving coil of said power reception device is equal to or less than 0.1.

8. The power transmission device according to claim 1, wherein said first coil transmits electric power to a power receiving coil of said power reception device through at least one of a magnetic field formed between said first coil and said power receiving coil and oscillating at a specific frequency, and an electric field formed between said first coil and said power receiving coil and oscillating at a specific frequency.

9. A power reception device receiving electric power from a power transmission device in a contactless manner, said power reception device comprising:

a first coil for receiving electric power from said power transmission device in a contactless manner;

a plurality of second each for extracting electric power from said first coil in a contactless manner and outputting the electric power to an electric load; and

a movement device for moving said first coil relative to said plurality of second coils.

10. The power reception device according to claim 9, wherein said plurality of second coils are formed of one conductive wire.

11. The power reception device according to claim 9, further comprising a switching unit provided between said plurality of second coils and said electric load, electrically connecting, to said electric load, a coil of said plurality of second coils that is closest to said first coil, and electrically disconnecting at least one remaining coil of said plurality of second coils from said electric load.

12. The power reception device according to claim 9, further comprising a switching unit provided between said plurality of second coils and said electric load, electrically connecting, to said electric load, a coil of said plurality of second coils that achieves optimum efficiency of power reception from said power transmission device, and electrically disconnecting at least one remaining coil of said plurality of second coils from said electric load.

13. The power reception device according to claim 9, wherein

said power reception device is mounted in a vehicle, and

said plurality of second coils are arranged in a front-rear direction of said vehicle.

14. The power reception device according to claim 9, wherein a difference between a natural frequency of said first coil and a natural frequency of a power transmitting coil of said power transmission device is equal to or less than ±

10% of the natural frequency of said first coil or the natural frequency of said power transmitting coil.

15. The power reception device according to claim 9, wherein a coupling coefficient between said first coil and a power transmitting coil of said power transmission device is equal to or less than 0.1.

16. The power reception device according to claim 9, wherein said first coil receives electric power from a power transmitting coil of said power transmission device through at least one of a magnetic field formed between said first coil and said power transmitting coil and oscillating at a specific frequency, and an electric field formed between said first coil and said power transmitting coil and oscillating at a specific frequency.

17. A power transfer system transferring electric power from a power transmission device to a power reception device in a contactless manner,

said power transmission device including

a first coil for transmitting electric power to said power reception device in a contactless manner,

a plurality of second coils each for supplying electric power to said first coil in a contactless manner, said electric power being received from a power supply, and

moving means for moving said first coil based on a positional relation between said power reception device and said first coil in a range in which electric power can be supplied from one of said plurality of second coils to said first coil, and

said power reception device including

a power reception unit receiving, in a contactless manner, electric power output from said first coil, and

an electric load receiving the electric power received by said power reception unit.

18. A power transfer system transferring electric power from a power transmission device to a power reception device in a contactless manner,

said power transmission device including

a power supply, and

a power transmission unit outputting electric power to said power reception device in a contactless manner, said electric power being supplied from said power supply, and

said power reception device including

a first coil for receiving electric power from said power transmission unit in a contactless manner,

a plurality of second coils each for extracting electric power from said first coil in a contactless manner and outputting the electric power to an electric load, and

moving means for moving said first coil based on a positional relation between said power transmission unit and said first coil in a range in which one of said plurality of second coils can extract electric power from said first coil in a contactless manner.