Power transmission device, vehicle equipped with power transmission device, and wireless power transmission system

• US 10,158,236 B2
• Filed: 10/19/2015
• Issued: 12/18/2018
• Est. Priority Date: 11/01/2014
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Hiromu, Kanno, Hiroshi
• Primary Examiner(s): Johnson, Ryan
• Application Number:
  US14/886,141
• Publication Number:
  US 20160121732A1
• Time in Patent Office: 1,156 Days
• 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: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01F 27/2804 Printed windings
• 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 50/005 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 50/12 of the resonant type
• 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 power transmission device having a surface a part of which defines a power transmission plane, the device includes: a power transmission circuit converting DC power into AC power; and a power transmission coil structure including 2N planar coils laminated in a direction which is perpendicular to the power transmission plane, the power transmission coil structure wirelessly transmitting the converted AC power to a power receiving coil of a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane in the power transmission device. The 2N planer coils constitute coil groups including a coil group in which a planar coil having an i'"'"'th highest inductance out of the 2N planar coils and a planar coil having an i'"'"'th-lowest inductance are connected in series and the coil groups are connected in parallel to each other.

Claims

1. A power transmission device having a surface a part of which defines a power transmission plane, the device comprising:

a power transmission circuit converting DC power into AC power; and

a power transmission coil structure including 2N planar coils (N is an integer of two or larger) laminated in a direction perpendicular to the power transmission plane, the power transmission coil structure wirelessly transmitting the converted AC power to a power receiving coil of a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane in the power transmission device, the 2N planar coils

wherein the 2N planar coils constitute N coil groups,

i'"'"'th coil group of the N coil groups includes a planar coil having an i'"'"'th highest inductance out of the 2N planar coils and a planar coil having an i'"'"'th-lowest inductance, where i denotes an integer of one to N,

the planar coil having the i'"'"'th highest inductance and the planar coil having the i'"'"'th-lowest inductance in the i'"'"'th coil group are connected in series with each other, and

the N coil groups are connected in parallel to each other.

2. The power transmission device according to claim 1,

wherein, in a case where N is 2, a planar coil having a highest inductance and a planar coil having a lowest inductance are serially connected, and a planar coil having a second highest inductance and a planar coil having a second lowest inductance are serially connected.

3. The power transmission device according to claim 1,

wherein a magnetic substance is provided on a side of the power transmission coil structure opposite from the power transmission plane in the power transmission device.

4. The power transmission device according to claim 1,

wherein the 2N planar coils comprise a multi-layer board including a plurality of boards being layered, each of the plurality of boards including a winding conductor pattern provided on an insulating board or a dielectric board.

5. The power transmission device according to claim 1,

wherein the power transmission coil structure comprises a plurality of power transmission coil structures.

6. The power transmission device according to claim 1,

wherein the power transmission coil structure further includes one of a first additional planar coil connected in series to the 2N planar coils and a second additional planar coil connected in parallel to the 2N planar coils.

7. The power transmission device according to claim 1,

wherein the 2N planar coils are layered perpendicularly to the power transmission plane.

8. The power transmission device according to claim 1,

wherein the 2N planar coils are sectioned in increments of layers,

wherein multiple planar coils are provided to each layer,

and wherein the layers are layered perpendicularly to the power transmission plane.

9. A vehicle, in which is installed the power transmission device according to claim 1.

10. A wireless power transmission system, comprising:

the power transmission device according to claim 1; and

the power receiving device.

11. A power transmission coil used in a power transmission device having a surface a part of which defines a power transmission plane, the device comprises:

a power transmission circuit converting DC power into AC power; and

a power transmission coil structure including 2N planar coils (N is an integer of two or larger) laminated in a direction which is perpendicular to the power transmission plane, the power transmission coil structure wirelessly transmitting the converted AC power to a power receiving coil of a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane in the power transmission device,

wherein the 2N planar coils constitute N coil groups,

i'"'"'th coil group of the N coil groups includes a planar coil having an i'"'"'th highest inductance out of the 2N planar coils and a planar coil having an i'"'"'th-lowest inductance, where i denotes an integer of one to N,

the planar coil having the i'"'"'th highest inductance and the planar coil having the i'"'"'th-lowest inductance in the i'"'"'th coil group are connected in series with each other, and

the N coil groups are connected in parallel to each other.

12. A power transmission antenna comprising:

the power transmission coil according to claim 11, and

a resonance capacitor.

13. A power transmission device having a surface a part of which defines a power transmission plane, the device comprising:

a power transmission circuit converting DC power into AC power;

a power transmission coil structure including M planar coils (M is an integer of three or larger) laminated in a direction which is perpendicular to the power transmission plane, the power transmission coil structure wirelessly transmitting the converted AC power to a power receiving coil of a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane in the power transmission device,

wherein the M planar coils have different inductances increasing from first to M'"'"'th planar coils;

the M planar coils constitute N coil groups, where N is an integer larger than one and smaller than M,

i'"'"'th coil group of the N coil groups includes at least two planar coils of the M planar coils, where i denotes an integer of one to N,

the at least two planar coils in the i'"'"'th coil group are selected from the M planar coils by an order different from an order of the inductances of the M planar coils,

each planar coil included in the i'"'"'th coil group is connected in series with each other planar coil included in the i'"'"'th coil group, and

the N coil groups are connected in parallel to each other.

14. The power transmission device according to claim 13,

wherein the M planar coils are layered in ascending order or descending order of the inductance values.

15. The power transmission device according to claim 13,

wherein the M planar coils are layered perpendicularly to the power transmission plane.

16. The power transmission device according to claim 13,

wherein the M planar coils are sectioned in increments of layers,

wherein multiple planar coils are provided to each layer,

and wherein the layers are layered perpendicularly to the power transmission plane.

17. The power transmission device according to claim 13,

wherein a magnetic substance is provided on a side of the power transmission coil structure opposite from the power transmission plane in the power transmission device.

18. The power transmission device according to claim 13,

wherein the M planar coils comprise a multi-layer board including a plurality of boards being layered, each of the plurality of boards including a winding conductor pattern provided on an insulating board or a dielectric board.

19. The power transmission device according to claim 13,

wherein the power transmission coil structure comprises a plurality of power transmission coil structures.

20. The power transmission device according to claim 13,

wherein the power transmission coil structure further includes one of a first additional planar coil serially connected to the M planar coils, and a second additional planar coil connected in parallel to the M planar coils.