POWER TRANSMISSION DEVICE, VEHICLE EQUIPPED WITH POWER TRANSMISSION DEVICE, AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20160121732A1
• Filed: 10/19/2015
• Published: 05/05/2016
• 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
• Granted Patent: US 10,158,236 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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 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 where i denotes any one integer of one to N, and the 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 value and a planar coil having a lowest inductance value are serially connected, and a planar coil having a second highest inductance value and a planar coil having a second lowest inductance value 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 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 are constituted by a multi-layer board including winding conductor patterns on insulating boards or dielectric boards, the conductor patterns being layered.

5. The power transmission device according to claim 1,

wherein the at least one power transmission coil includes a plurality of power transmission coils.

6. The power transmission device according to claim 1,

wherein the power transmission coil 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 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 where i denotes any one integer of one to N, and the 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 planer coils constitute coil groups including a coil group in which two or more planar coils are selected by an order different from the order of magnitude in the inductance values are connected in series, and the 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 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 are constituted by a multi-layer board including winding conductor patterns on insulating boards or dielectric boards, the conductor patterns being layered.

19. The power transmission device according to claim 13,

wherein the at least one power transmission coil includes a plurality of power transmission coils.

20. The power transmission device according to claim 13,

wherein the power transmission coil includes one of a third additional planar coil serially connected to the M planar coils, and a fourth additional planar coil connected in parallel to the M planar coils.