COIL UNIT, NON-CONTACT POWER TRANSMISSION DEVICE, NON-CONTACT POWER RECEPTION DEVICE, NON-CONTACT POWER SUPPLY SYSTEM, AND VEHICLE

• US 20130038281A1
• Filed: 04/21/2011
• Published: 02/14/2013
• Est. Priority Date: 04/27/2010
• Status: Active Grant

• Current Assignee: Nippon Soken, Inc., Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nippon Soken, Inc., Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sakakibara, Hiroyuki, Ichikawa, Shinji
• Granted Patent: US 8,508,184 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• 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: 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 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 coil unit performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit. The coil unit includes a secondary resonance coil that includes a plurality of coils, and that electromagnetically resonates with the primary resonance coil. A first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the primary resonance coil.

Claims

1. A coil unit that performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit, the coil unit comprising

a secondary resonance coil that includes a plurality of coils, and that electromagnetically resonates with the primary resonance coil, wherein

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the primary resonance coil.

2. The coil unit according to claim 1, wherein

the first coil is disposed adjacent to at least one coil other than the first coil among the plurality of coils, on a plane perpendicular to a direction of the magnetic field generated by the first coil.

3. The coil unit according to claim 2, wherein

the first coil is disposed in a manner such that the magnetic field generated by the first coil has the phase opposite to the phase of the magnetic field generated by the at least one coil other than the first coil among the plurality of coils, which is adjacent to the first coil.

4. The coil unit according to claim 1, wherein

the number of the plurality of coils is an even number.

5. The coil unit according to claim 4, wherein

the number of the plurality of coils is two.

6. The coil unit according to claim 5, wherein

the plurality of coils further include a second coil;

the first coil and the second coil are disposed in a manner such that a direction of winding of the first coil is opposite to a direction of winding of the second coil when the first coil and the second coil are seen from the primary resonance coil; and

the first coil is connected to the second coil so that a direction of an electric current flowing through the first coil is opposite to a direction of an electric current flowing through the second coil, when the first coil and the second coil are seen from the primary resonance coil.

7. The coil unit according to claim 5, wherein

the plurality of coils further include a second coil;

the first coil and the second coil are disposed in a manner such that a direction of winding of the first coil is the same as a direction of winding of the second coil when the first coil and the second coil are seen from the primary resonance coil; and

the first coil is connected to the second coil so that a direction of an electric current flowing through the first coil is opposite to a direction of an electric current flowing through the second coil, when the first coil and the second coil are seen from the primary resonance coil.

8. The coil unit according to claim 1, wherein

the plurality of coils have a substantially same reactance.

9. The coil unit according to claim 1, wherein

the plurality of coils are connected in series to each other.

10. The coil unit according to claim 1, wherein

the plurality of coils are connected in parallel to each other.

11. The coil unit according to claim 1, further comprising

a capacitor connected to both ends of the secondary resonance coil.

12. The coil unit according to claim 1, further comprising

an electromagnetic induction coil configured to perform at least one of transmission of electric power to the secondary resonance coil and reception of electric power from the secondary resonance coil, using electromagnetic induction, wherein

the electromagnetic induction coil is magnetically coupled with at least one of the plurality of coils.

13. The coil unit according to claim 1, wherein

the plurality of coils are separate coils that are not connected to each other.

14. The coil unit according to claim 13, further comprising

an electromagnetic induction coil configured to perform at least one of transmission of electric power to the secondary resonance coil and reception of electric power from the secondary resonance coil, using electromagnetic induction, wherein

the electromagnetic induction coil is magnetically coupled with at least one of the plurality of coils.

15. The coil unit according to claim 14, wherein

the electromagnetic induction coil is disposed in a manner such that the electromagnetic induction coil is magnetically coupled with a magnetic field generated in a same direction as a direction of axes around which the plurality of coils are wound.

16. The coil unit according to claim 14, wherein

the electromagnetic induction coil is disposed in a manner such that the electromagnetic induction coil is magnetically coupled with a magnetic field generated in a direction orthogonal to a direction of axes around which the plurality of coils are wound.

17. The coil unit according to claim 13, further comprising

a plurality of electromagnetic induction coils corresponding to the respective plurality of coils, wherein

the plurality of electromagnetic induction coils are configured to perform at least one of transmission of electric power to the corresponding coils and reception of electric power from the corresponding coils, using electromagnetic induction.

18. The coil unit according to claim 17, wherein

the plurality of electromagnetic induction coils are connected in series to each other.

19. The coil unit according to claim 17, wherein

the plurality of electromagnetic induction coils are connected in parallel to each other.

20. The coil unit according to claim 11, further comprising

capacitors corresponding to the respective plurality of coils, wherein each of the capacitors is connected to both ends of a corresponding one of the plurality of coils.

21. A non-contact power reception device that receives electric power from a power transmission device in a non-contact manner, wherein the power transmission device faces the non-contact power reception device, the non-contact power reception device comprising

a resonance coil that includes a plurality of coils, and that is configured to receive electric power from the power transmission device using electromagnetic resonance between the resonance coil and the power transmission device, wherein

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the power transmission device.

22. A non-contact power transmission device that transmits electric power to a power reception device in a non-contact manner, wherein the power reception device faces the non-contact power transmission device, the non-contact power transmission device comprising

a resonance coil that includes a plurality of coils, and that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the resonance coil and the power reception device, wherein

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the power reception device.

23. A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

a power transmission device; and

a power reception device that faces the power transmission device, and that receives electric power from the power transmission device, wherein

the power transmission device includes a resonance coil that includes a plurality of coils, and that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the resonance coil and the power reception device; and

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the power reception device.

24. A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

a power transmission device that transmits electric power that has been supplied from a power source device; and

a power reception device that faces the power transmission device, wherein

the power reception device includes a resonance coil that includes a plurality of coils, and that is configured to receive electric power from the power transmission device using electromagnetic resonance between the resonance coil and the power transmission device; and

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the power transmission device.

25. A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

a power transmission device; and

a power reception device that faces the power transmission device, wherein

the power transmission device includes a primary resonance coil that includes a plurality of power transmission coils, and that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the primary resonance coil and the power reception device;

a first transmission coil among the plurality of power transmission coils is disposed in a manner such that a magnetic field generated by the first transmission coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first transmission coil among the plurality of power transmission coils, with respect to a plane that faces the power reception device;

the power reception device includes a secondary resonance coil that includes a plurality of power reception coils, and that is configured to receive electric power from the power transmission device using electromagnetic resonance between the secondary resonance coil and the primary resonance coil; and

a first reception coil among the plurality of power reception coils is disposed in a manner such that a magnetic field generated by the first reception coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first reception coil among the plurality of power reception coils, with respect to a plane that faces the power transmission device.

26. The non-contact power supply system according to claim 25, wherein

the plurality of power transmission coils and the plurality of power reception coils are disposed in a manner such that a magnetic field generated by each of the power transmission coils has a same phase as a phase of a magnetic field generated by a corresponding one of the power reception coils, which faces the power transmission coil.

27. The non-contact power supply system according to claim 25, wherein

the plurality of power transmission coils and the plurality of power reception coils have a substantially same shape.

28. A non-contact power supply system in which electric power is transmitted and received in a non-contact manner, the non-contact power supply system comprising:

a first transmission device; and

a second transmission device that faces the first transmission device, wherein

the first transmission device includes a primary resonance coil that includes a plurality of first power transmission reception coils, and that is configured to receive electric power from the second transmission device and to transmit electric power from the first transmission device using electromagnetic resonance between the primary resonance coil and the second transmission device;

a first coil among the plurality of first power transmission reception coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of first power transmission reception coils, with respect to a plane that faces the second transmission device;

the second transmission device includes a secondary resonance coil that includes a plurality of second power transmission reception coils, and that is configured to receive electric power from the first transmission device and to transmit electric power from the second transmission device using electromagnetic resonance between the secondary resonance coil and the first transmission device; and

a second coil among the plurality of second power transmission reception coils is disposed in a manner such that a magnetic field generated by the second coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the second coil among the plurality of second power transmission reception coils, with respect to a plane that faces the first transmission device.

29. A vehicle that receives electric power in a non-contact manner from a power transmission device which is outside the vehicle, and which faces the vehicle, the vehicle comprising:

a power reception device;

a power storage device that is charged with electric power received by the power reception device; and

a drive device configured to generate drive power for driving the vehicle, using the electric power supplied from the power storage device, wherein

the power reception device includes a resonance coil that includes a plurality of coils, and that is configured to receive electric power from the power transmission device using electromagnetic resonance between the resonance coil and the power transmission device, wherein

a first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the power transmission device.