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

• US 10,157,704 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:
  US14/886,139
• Publication Number:
  US 20160121731A1
• Time in Patent Office: 1,156 Days
• 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 structure opposite from 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 an i'"'"'th closest planar coil to the power transmission plane out of the 2N planar coils and an i'"'"'th-closest planar coil to the magnetic substance out of the 2N planar coils, where i denotes an integer of one to N,

the i'"'"'th closest planar coil to the power transmission plane and the i'"'"'th-closest planar coil to the magnetic substance 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 of four planar coils closest to the power transmission plane and a 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 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.

6. The power transmission device according to claim 1,

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

7. 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.

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. The power transmission device according to claim 1, wherein each planar coil included in the i'"'"'th coil group is connected in parallel to and is not connected in series with each planar coil included in j'"'"'th coil group, where j denotes an integer of one to N and is different from i.

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;

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 structure opposite from 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 an i'"'"'th closest planar coil to the power transmission plane out of the 2N planar coils, and an i'"'"'th-closest planar coil to the magnetic substance out of the 2N planar coils, where i denotes an integer of one to N,

the i'"'"'th closest planar coil to the power transmission plane and the i'"'"'th-closest planar coil to the magnetic substance 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; and

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

wherein the M planar coils are laminated in an order from first to M'"'"'th planar coils from the power transmission plane,

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 the laminated order 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 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.

15. 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.

16. The power transmission device according to claim 13,

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

17. The power transmission device according to claim 13,

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

18. A vehicle, in which is installed the power transmission device according to claim 13.

19. A wireless power transmission system, comprising:

the power transmission device according to claim 13; and

the power receiving device.

20. The power transmission device according to claim 13, wherein each planar coil included in the i'"'"'th coil group is connected in parallel to and is not connected in series with each planar coil included in j'"'"'th coil group, where j denotes an integer of one to N and is different from i.