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

• US 20160121731A1
• 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 10,157,704 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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: H01F 5/003 Printed circuit coils
• 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 50/12 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

Abstract

A power transmission device having a surface a part of which defines a power transmission plane. The device includes: a power transmission coil structure including 2N planar coils laminated in a perpendicular direction to the power transmission plane and wirelessly transmitting AC power to a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane; and a magnetic substance disposed on a side of the power transmission coil opposite from the power transmission plane, wherein the 2N planer coils constitute coil groups including a coil group in which an i'"'"'th closest planar coil to the power transmission plane out of the 2N planar coils and the i'"'"'th-closest planar coil to the magnetic substance out of the 2N planar coils 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;

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; and

a magnetic substance disposed on a side of the power transmission coil opposite from the power transmission plane in the power transmission device,

wherein the 2N planer coils constitute coil groups including a coil group in which an i'"'"'th closest planar coil to the power transmission plane out of the 2N planar coils and the i'"'"'th-closest planar coil to the magnetic substance out of the 2N planar coils 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 of four planar coils closest to the power transmission plane and the other planar coil of four planar coils closest to the magnetic substance are connected in series, and a planar coil of four planar coils second closest to the power transmission plane and a planar coil of four planar coils second closest to the magnetic substance are connected in series.

3. The power transmission device according to claim 1,

wherein, in a case where N is 3, a planar coil of six planar coils closest to the power transmission plane and a planar coil of six planar coils closest to the magnetic substance are connected in series, a planar coil of six planar coils second closest to the power transmission plane and a planar coil of six planar coils second closest to the magnetic substance are connected in series, and a planar coil of six planar third closest to the power transmission plane and a planar coil of six planar third closest to the magnetic substance are connected in series.

4. The power transmission device according to claim 1,

wherein an inductance value of the planar coil closest to the power transmission plane is the smallest and an inductance value of the planar coil closest to the magnetic substance is the largest.

5. 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.

6. The power transmission device according to claim 1,

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

7. 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.

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

9. A wireless power transmission system, comprising:

the power transmission device according to claim 1; and

the power receiving device.

10. 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;

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; and

a magnetic substance disposed on a side of the power transmission coil opposite from the power transmission plane in the power transmission device,

wherein the 2N planer coils constitute coil groups including a coil group in which an i'"'"'th closest planar coil to the power transmission plane out of the 2N planar coils, and the i'"'"'th-closest planar coil to the magnetic substance out of the 2N planar coils 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.

11. A power transmission antenna comprising:

the power transmission coil according to claim 10, and

a resonance capacitor.

12. 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; and

a magnetic substance disposed on a side of the power transmission coil opposite from the power transmission plane in the power transmission device,

wherein the M planer coils constitute coil groups including a coil group in which the planer coils are selected from the planar coil closest to the power transmission plane through the M'"'"'th planar coil from the power transmission plane by an order differ from the order of 1 through M and the selected planer coils are connected in series, and the coil groups are connected in parallel to each other.

13. The power transmission device according to claim 12,

wherein an inductance value of the planar coil closest to the power transmission plane is the smallest, and an inductance value of the planar coil M'"'"'th closest to the power transmission plane is the largest.

14. The power transmission device according to claim 12,

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.

15. The power transmission device according to claim 12,

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

16. The power transmission device according to claim 12,

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

17. A vehicle, in which is installed the power transmission device according to claim 12.

18. A wireless power transmission system, comprising:

the power transmission device according to claim 12; and

the power receiving device.