Power reception device and power transmission device

• US 9,787,138 B2
• Filed: 06/04/2012
• Issued: 10/10/2017
• Est. Priority Date: 06/04/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): BARNIE, REXFORD N
• Assistant Examiner(s): Ortiz, Elim
• Application Number:
  US14/398,811
• Publication Number:
  US 20150130288A1
• Time in Patent Office: 1,954 Days
• 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: H01F 27/025 Constructional details relating to cooling
• CPC Class Codes: H01F 27/085 Cooling by ambient air
• CPC Class Codes: H01F 27/266 Fastening or mounting the core on casing or support on coil H01F27/30
• CPC Class Codes: H01F 27/32 Insulating of coils, windings, or parts thereof
• 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 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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 50/10 using inductive coupling
• 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 7/0042 characterised by the mechanical construction
• 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 power reception device includes a first case having an accommodation portion formed therein, a core disposed in the first case, a second coil disposed in the first case and provided on the core, a first electrical device disposed in the first case and connected to the second coil, a first insulation member disposed between an inner surface of the first case and the second coil, and between the inner surface of the first case and the first electrical device, and a cooling device that causes a flow of a coolant to cool the second coil and the first electrical device, the second coil and the first electrical device being attached to the inner surface of the first case with the first insulation member interposed therebetween, the first electrical device being disposed upstream in a flow direction of the coolant from the second coil.

Claims

1. A power reception device that receives electric power in a non-contact manner from a power transmission unit including a first coil, comprising:

a case having an accommodation portion formed therein;

a core disposed in said case;

a second coil disposed in said case and provided on said core;

an electrical device disposed in said case and connected to said second coil;

an insulation member disposed between an inner surface of said case and said second coil, and between the inner surface of said case and said electrical device; and

a cooling device that causes a flow of a coolant to cool said second coil and said electrical device,

said second coil and said electrical device being attached to the inner surface of said case with said insulation member interposed therebetween,

said electrical device being disposed upstream in a flow direction of said coolant from said second coil, wherein

said electrical device includes a capacitor connected to said second coil, and a rectifier that rectifies a current received by said second coil,

said rectifier is disposed upstream in the flow direction of said coolant from said capacitor, and

said capacitor is disposed upstream in the flow direction of said coolant from said second coil.

2. The power reception device according to claim 1, wherein

said cooling device supplies the coolant into said case.

3. The power reception device according to claim 2, wherein

said second coil is formed to surround a first winding axis, and

said cooling device supplies said coolant in a first intersecting direction that intersects a direction in which said first winding axis extends.

4. The power reception device according to claim 1, wherein

said case is sealed.

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

said second coil and a capacitor connected to said second coil form a power reception unit that receives electric power in a non-contact manner from said power transmission unit, and

a difference between a natural frequency of said power transmission unit and a natural frequency of said power reception unit is 10% or less of the natural frequency of said power reception unit.

6. The power reception device according to claim 1, wherein

said second coil and a capacitor connected to said second coil form a power reception unit that receives electric power in a non-contact manner from said power transmission unit, and

a coupling coefficient between said power reception unit and said power transmission unit is 0.1 or less.

7. The power reception device according to claim 1, wherein

said second coil and a capacitor connected to said second coil form a power reception unit that receives electric power in a non-contact manner from said power transmission unit, and

said power reception unit receives electric power from said power transmission unit through at least one of a magnetic field and an electric field, said magnetic field being formed between said power reception unit and said power transmission unit and oscillating at a specific frequency, said electric field being formed between said power reception unit and said power transmission unit and oscillating at the specific frequency.

8. A power reception device that receives electric power in a non-contact manner from a power transmission unit including a first coil, comprising:

a case having an accommodation portion formed therein;

a core disposed in said case;

a second coil disposed in said case and provided on said core,

an electrical device disposed in said case and connected to said second coil;

an insulation member disposed between an inner surface of said case and said second coil, and between the inner surface of said case and said electrical device; and

a cooling device that causes a flow of a coolant to cool said second coil and said electrical device,

said second coil and said electrical device being attached to the inner surface of said case with said insulation member interposed therebetween,

said electrical device being disposed upstream in a flow direction of said coolant from said second coil, wherein

said electrical device includes a capacitor connected to said second coil, and a rectifier that rectifies a current received by said second coil,

said capacitor is disposed upstream in the flow direction of said coolant from said rectifier, and

said rectifier is disposed upstream in the flow direction of said coolant from said second coil.

9. A power reception device that receives electric power in a non-contact manner from a power transmission unit including a first coil, comprising:

a case having an accommodation portion formed therein;

a core disposed in said case;

a second coil disposed in said case and provided on said core;

an electrical device disposed in said case and connected to said second coil;

an insulation member disposed between an inner surface of said case and said second coil, and between the inner surface of said case and said electrical device; and

a cooling device that causes a flow of a coolant to cool said second coil and said electrical device,

said second coil and said electrical device being attached to the inner surface of said case with said insulation member interposed therebetween,

said electrical device being disposed upstream in a flow direction of said coolant from said second coil, wherein

said second coil is formed to surround a first winding axis,

said core includes a first stem portion having said second coil wound therearound, a first magnetic pole portion formed at a first end portion of said first stem portion and extending in a first intersecting direction that intersects a direction in which said first winding axis extends, and a second magnetic pole portion formed at a second end portion of said first stem portion and extending in said first intersecting direction,

a width of said first stem portion in said first intersecting direction is smaller than a length of said first magnetic pole portion and a length of said second magnetic pole portion in said first intersecting direction,

a first central portion positioned at a center of said first magnetic pole portion in said first intersecting direction and a second central portion positioned at a center of said second magnetic pole portion in said first intersecting direction are displaced in said first intersecting direction from a third central portion positioned at a center of said first stem portion in said first intersecting direction, and

said electrical device is disposed so as to be displaced from said first stem portion in said first intersecting direction, and is disposed between said first magnetic pole portion and said second magnetic pole portion.

10. A power transmission device that transmits electric power in a non-contact manner to a power reception unit including a second coil, comprising:

a case having an accommodation portion;

a core disposed in said case;

a first coil disposed in said case and provided on said core;

a second electrical device disposed in said case and connected to said first coil;

an insulation member disposed between an inner surface of said case and said first coil, and between the inner surface of said case and said second electrical device; and

a cooling device that causes a flow of a coolant to cool said first coil and said second electrical device,

said first coil and said second electrical device being attached to the inner surface of said case with said insulation member interposed therebetween,

said second electrical device being disposed upstream in a flow direction of said coolant from said first coil, wherein

said first coil is formed to surround a second winding axis,

said core includes a second stem portion having said first coil wound therearound, a third magnetic pole portion formed at a third end portion of said second stem portion and extending in a second intersecting direction that intersects a direction in which said second winding axis extends, and a fourth magnetic pole portion formed at a fourth end portion of said second stem portion and extending in said second intersecting direction,

a width of said second stem portion in said second intersecting direction is smaller than a length of said third magnetic pole portion and a length of said fourth magnetic pole portion in said second intersecting direction,

a fourth central portion positioned at a center of said third magnetic pole portion in said second intersecting direction and a fifth central portion positioned at a center of said fourth magnetic pole portion in said second intersecting direction are displaced in said second intersecting direction from a sixth central portion positioned at a center of said second stem portion in said second intersecting direction, and

said second electrical device is disposed so as to be displaced from said second stem portion in said second intersecting direction, and is disposed between said third magnetic pole portion and said fourth magnetic pole portion.

11. The power transmission device according to claim 10, wherein

said second electrical device includes a capacitor connected to said first coil.

12. The power transmission device according to claim 10, wherein

said cooling device supplies the coolant into said case.

13. The power transmission device according to claim 12, wherein

said first coil is formed to surround a second winding axis, and

said cooling device supplies said coolant in a second intersecting direction that intersects a direction in which said second winding axis extends.

14. The power transmission device according to claim 10, wherein

said case is sealed.

15. The power transmission device according to claim 10, wherein

said first coil and a capacitor connected to said first coil form a power transmission unit that transmits electric power in a non-contact manner to said power reception unit, and

a difference between a natural frequency of said power transmission unit and a natural frequency of said power reception unit is 10% or less of the natural frequency of said power reception unit.

16. The power transmission device according to claim 10, wherein

said first coil and a capacitor connected to said first coil form a power transmission unit that transmits electric power in a non-contact manner to said power reception unit, and

a coupling coefficient between said power reception unit and said power transmission unit is 0.1 or less.

17. The power transmission device according to claim 10, wherein

said first coil and a capacitor connected to said first coil form a power transmission unit that transmits electric power in a non-contact manner to said power reception unit, and

said power transmission unit transmits electric power to said power reception unit through at least one of a magnetic field and an electric field, said magnetic field being formed between said power reception unit and said power transmission unit and oscillating at a specific frequency, said electric field being formed between said power reception unit and said power transmission unit and oscillating at the specific frequency.