POWER SUPPLYING DEVICE

• US 20170104371A1
• Filed: 10/11/2016
• Published: 04/13/2017
• Est. Priority Date: 10/13/2015
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Funai Electric Co., Ltd.
• Inventors: WAKABAYASHI, NAOYUKI, TANABE, HIDEKI
• Granted Patent: US 10,256,667 B2
• Time in Patent Office: Days
• 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: H04B 5/26 using coils
• CPC Class Codes: H04B 5/43 Antennas
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The invention provides a power supplying device, which includes a first coil; and a second coil, which is wound to be substantially line symmetrical to the first coil with respect to a center line, wherein the center line is an axis passing through a winding center of the first coil. A ground point of the first coil and the second coil is disposed further inside than an outermost winding of the first coil.

Claims

1. A power supplying device, comprising:

a first coil; and

a second coil, wound to be substantially line symmetrical to the first coil with respect to a center line, wherein the center line is an axis passing through a winding center of the first coil,

wherein a ground point of the first coil and the second coil being provided further inside than an outermost winding of the first coil.

2. The power supplying device according to claim 1, wherein the ground point is provided further inside than an innermost winding of the first coil.

3. The power supplying device according to claim 1, wherein the ground point is disposed near the winding center of the first coil.

4. The power supplying device according to claim 1, wherein the winding center of the first coil is identical to a winding center of the second coil.

5. The power supplying device according to claim 1, wherein the ground point is provided on the winding center of the first coil and a winding center of the second coil.

6. The power supplying device according to claim 1, wherein the ground point is provided on a position other than the winding center of the first coil and a winding center of the second coil.

7. The power supplying device according to claim 1, wherein the first coil has a first end and a second end, the first coil has a spiral shape with the first end disposed inside and the second end disposed outside, and a first differential signal is inputted to the first end.

8. The power supplying device according to claim 7, wherein the second coil has a third end and a fourth end, the second coil has a spiral shape with the third end disposed inside and the fourth end disposed outside, and a second differential signal having a polarity different from the first differential signal is inputted to the third end.

9. The power supplying device according to claim 8, wherein the second end of the first coil and the fourth end of the second coil are disposed near the axis at positions showing a substantial line symmetry with respect to the axis as the center line.

10. The power supplying device according to claim 8, wherein the second end and the fourth end are opened.

11. The power supplying device according to claim 1, wherein the first coil, the second coil and the ground point are provided on a substrate having multiple layers.

12. The power supplying device according to claim 11, wherein the substrate comprises a ground terminal, and the ground terminal is connected to an external ground and provided outside the first coil.

13. The power supplying device according to claim 12, wherein the substrate comprises:

a plurality of intersected portions where the first coil and the second coil are intersected with each other when viewing from a direction perpendicular to a predetermined plane; and

a connecting line, provided in at least one layer among the first layer and the second layer of the substrate and connected to the ground point and the ground terminal.

14. The power supplying device according to claim 13, wherein the connecting line is formed by surrounding at least a part of the intersected portions to show a substantial line symmetry with respect to the axis as the center line.

15. The power supplying device according to claim 11, wherein the substrate comprises:

a first terminal, connected to the first coil and one end of two output ends for outputting first and second differential signals, and provided outside the first coil; and

a second terminal, connected to the second coil and another end of the two output ends, and provided outside the second coil.

16. The power supplying device according to claim 11, wherein the multiple layers are arranged in a manner that the first coil and the second coil are provided in a same layer serving as a coil layer, and the ground point is provided in a ground layer different from the coil layer among the multiple layers.

17. The power supplying device according to claim 11, wherein each of the first coil and the second coil are provided across a first layer and a second layer among the multiple layers of the substrate.

18. The power supplying device according to claim 11, wherein the substrate comprises an electric field shielding layer, and the electric field shielding layer is connected to the ground point and formed to show a substantial line symmetry with respect the axis as the center line.

19. The power supplying device according to claim 18, wherein the electric field shielding layer is provided by covering the first coil and the second coil.

20. The power supplying device according to claim 8, comprising a differential power source, outputting the first differential signal and the second differential signal from the two output ends.