CONTACTLESS POWER TRANSMISSION APPARATUS AND A METHOD OF MANUFACTURING A SECONDARY SIDE THEREOF

• US 20100181842A1
• Filed: 06/12/2008
• Published: 07/22/2010
• Est. Priority Date: 06/20/2007
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Isaka, Atsushi, Suzuki, Masayuki, Inakagata, Satoru, Kitamura, Hiroyasu, Keishu, Tatsuhiko
• Granted Patent: US 8,421,574 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 27/323 Insulation between winding turns, between winding layers
• 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 50/10 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 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

According to a first aspect, a secondary side of contactless power transmission apparatus includes: a holding member which is physically separated from a primary side; a magnetic layer; a shield layer for shielding electromagnetic noise; and a heat insulation layer. The secondary coil is a planar coil and supported by the holding member, and at least the magnetic layer is laminated on one side of the planar coil and unified with the planar coil. According to a second aspect, the secondary side of the apparatus includes a plurality of magnetic layers. Each permeability of the magnetic layers is different from each other, and each of the magnetic layers forms a magnetic path with the primary side.

Claims

1. Contactless power transmission apparatus, comprising a secondary coil located in a secondary side, said apparatus being configured to transmit electric power from a primary side to the secondary side by electromagnetic induction between a primary coil and the secondary coil, said primary coil being located in the primary side;

wherein the secondary side further comprises;

a holding member which is physically separated from the primary side;

a magnetic layer;

a shield layer for shielding electromagnetic noise; and

a heat insulation layer;

wherein the secondary coil is a planar coil and supported by the holding member, and at least the magnetic layer is laminated on one side of the planar coil and unified with the planar coil.

2. The contactless power transmission apparatus of claim 1, further comprising a radiation layer located between the holding member and the planar coil.

3. The contactless power transmission apparatus of claim 1 or 2, wherein the magnetic layer is formed to spread over a spiral depression on said one side of the planar coil.

4. The contactless power transmission apparatus of claim 1 or 2, wherein:

the magnetic layer is laminated on said one side of the planar coil;

the shield layer is laminated on the magnetic layer; and

the heat insulation layer is laminated on the shield layer.

5. The contactless power transmission apparatus of claim 3, wherein:

the magnetic layer is laminated on said one side of the planar coil;

the shield layer is laminated on the magnetic layer; and

the heat insulation layer is laminated on the shield layer.

6. The contactless power transmission apparatus of claim 1 or 2, further comprising a secondary device which includes the secondary side and has a housing, wherein the holding member is a part of the housing.

7. The contactless power transmission apparatus of claim 3, further comprising a secondary device which includes the secondary side and has a housing, wherein the holding member is a part of the housing.

8. The contactless power transmission apparatus of claim 4, further comprising a secondary device which includes the secondary side and has a housing, wherein the holding member is a part of the housing.

9. The contactless power transmission apparatus of claim 1 or 2, further comprising a functional member located in the secondary side, wherein the holding member is the functional member.

10. The contactless power transmission apparatus of claim 3, further comprising a functional member located in the secondary side, wherein the holding member is the functional member.

11. The contactless power transmission apparatus of claim 4, further comprising a functional member located in the secondary side, wherein the holding member is the functional member.

12. The contactless power transmission apparatus of claim 1 or 2, further comprising a secondary device including the secondary side and the holding member,

wherein the combination of the planar coil and at least the magnetic layer is in the form of a card, and can be attached to and detached from the holding member.

13. The contactless power transmission apparatus of claim 3, further comprising a secondary device including the secondary side and the holding member,

wherein the combination of the planar coil and at least the magnetic layer is in the form of a card, and can be attached to and detached from the holding member.

14. The contactless power transmission apparatus of claim 4, further comprising a secondary device including the secondary side and the holding member,

wherein the combination of the planar coil, the magnetic layer, the shield layer and the heat insulation layer is in the form of a card, and can be attached to and detached from the holding member.

15. The contactless power transmission apparatus of claim 5, further comprising a secondary device including the secondary side and the holding member,

wherein the combination of the planar coil, the magnetic layer, the shield layer and the heat insulation layer is in the form of a card, and can be attached to and detached from the holding member.

16. A method of manufacturing the second side in the contactless power transmission apparatus of claim 1, comprising forming the magnetic layer by pressing magnetic material made of crystalline metal material or non-crystalline metal material.

17. A method of manufacturing the second side in the contactless power transmission apparatus of claim 4, comprising:

applying the heat insulation layer to one side of the shield layer;

fixing the heat insulation layer and the shield layer by drying;

sticking the other side of the shield layer and one side of the magnetic layer together; and

sticking the other side of the magnetic layer and said one side of the planar coil together.

25. The contactless power transmission apparatus of claim 5, further comprising a secondary device which includes the secondary side and has a housing, wherein the holding member is a part of the housing.

26. The contactless power transmission apparatus of claim 5, further comprising a functional member located in the secondary side, wherein the holding member is the functional member.

18. Contactless power transmission apparatus, comprising a primary coil located in a primary side and a secondary coil located in a secondary side, said apparatus being configured to transmit electric power from the primary side to the secondary side by electromagnetic induction between the primary and the secondary coils;

wherein the primary side further comprises a first holding member which supports the first coil, and

the secondary side further comprises;

a second holding member which is physically separated from the first holding member and supports the secondary coil; and

a plurality of magnetic layers, the secondary coil being a planar coil, each permeability of the magnetic layers being different from each other, each of the magnetic layers forming a magnetic path with the primary side.

19. The contactless power transmission apparatus of claim 18, wherein the primary side further comprises a plurality of magnetic layers, and the primary coil is a planar coil, each permeability of the magnetic layers in the primary side being different from each other, each of the magnetic layers in the primary side forming a magnetic path with the secondary side.

20. The contactless power transmission apparatus of claim 18, wherein the magnetic layers are a first magnetic layer located on one side of the secondary coil, and a second magnetic layer located on the first magnetic layer, the other side of the secondary coil facing the primary coil, the permeability of the first magnetic layer being higher than that of the second magnetic layer.

21. The contactless power transmission apparatus of claim 19, wherein:

the magnetic layers in the primary side are a first magnetic layer located on one side of the primary coil, and a second magnetic layer located on the first magnetic layer, the other side of the primary coil facing the secondary coil, the permeability of the first magnetic layer being higher than that of the second magnetic layer; and

the magnetic layers in the secondary side are a first magnetic layer located on one side of the secondary coil, and a second magnetic layer located on this first magnetic layer, the other side of the secondary coil facing the primary coil, the permeability of the first magnetic layer in the secondary side being higher than that of the second magnetic layer in the secondary side.

22. The contactless power transmission apparatus of claim 20 or 21, wherein the area of the second magnetic layer in the secondary side is larger than that of the first magnetic layer in the secondary side.

23. The contactless power transmission apparatus of claim 20, wherein the second magnetic layer is located in the vicinity of a functional device in the secondary side.

24. The contactless power transmission apparatus of claim 18, further comprising a coil for data transmission, and a magnetic layer located in the vicinity of the coil for data transmission.