Inductive coupler for power line communications

• US 7,170,367 B2
• Filed: 10/25/2004
• Issued: 01/30/2007
• Est. Priority Date: 10/25/2004
• Status: Active Grant

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ambient S A
• Inventors: Cern, Yehuda
• Primary Examiner(s): Pascal; Robert
• Assistant Examiner(s): Glenn; Kimberly E.
• Application Number:
  US10/973,087
• Publication Number:
  US 20060087382A1
• Time in Patent Office: 827 Days
• Field of Search: 333/24.R, 340/310.17
• US Class Current: 333/24.00R
• CPC Class Codes: H01P 5/02 with invariable factor of coupling H01P5/12 takes precedence choke joints H01P1/04, H01P1/06

Abstract

There is provided an inductive coupler for coupling a data signal to a power line. The inductive coupler includes a split magnetic core having an aperture formed by an upper magnetic core and a lower magnetic core. The aperture permits the power line to pass therethrough as a primary winding, the upper magnetic core is for making electrical contact with an outer surface of the power line, and the lower magnetic core makes electrical contact with the upper magnetic core.

Claims

1. A method for configuring components for power line communications, comprising:

installing an inductive coupler that employs a power line conductor as a primary winding;

connecting a communications device to a secondary winding of said inductive coupler; and

connecting an rf signal transformer between said secondary winding and said communications device, wherein said rf signal transformer has a turns ratio of 2;

1.

2. The method of claim 1, further comprising applying a primary inductance via the inductive coupler of between about 1.5 pH to about 2.5 μ

H.

3. The method of claim 1, wherein path loss for said inductive coupler is less than about 10 dB.

4. The method of claim 1, further comprising reducing distortion in the power line communications by introducing gaps in a magnetic core of said inductive coupler.

5. The method of claim 1, wherein said rf signal transformer comprises cores made of nano-crystalline magnetic material.

6. An arrangement of components for coupling data between a power line and a communications device, comprising:

an inductive coupler that employs a power line conductor as a primary winding; and

an rf signal transformer for connecting a communications device to a secondary winding of said inductive coupler, wherein said rf signal transformer has a turns ratio of 2;

1.

7. The arrangement of claim 6, wherein said inductive coupler has a primary inductance of about 1.5 μ

H to about 2.5 μ

H.

8. The arrangement of claim 6, wherein path loss for the arrangement of components are less than about 10 dB.

9. The arrangement of claim 6, wherein said inductive coupler has a magnetic core with an aperture formed therethrough, said aperture permitting said primary and secondary windings to pass therethrough, and wherein said aperture has a diameter of about 1.5 inches.

10. The arrangement of claim 9, wherein said magnetic core has a radial thickness, and wherein said radial thickness is less than said diameter of said aperture.

11. The arrangement of claim 9, wherein said magnetic core has a pair of gaps formed on opposing sides of said magnetic core, and wherein said gaps have a thickness of about 30 mils.

12. The arrangement of claim 9, wherein said magnetic core weighs less than about 10 pounds.

13. The arrangement of claim 6, wherein said rf signal transformer comprises magnetic cores made of nano-crystalline magnetic material.

14. An inductive coupler for coupling a data signal between a communications device and a power line, comprising:

a magnetic core having an aperture formed by a first section and a second section, the first and second sections forming a gap therebetween, wherein said aperture permits the power line to pass therethrough as a primary winding; and

a secondary circuit having a winding passing through said aperture as a secondary winding connected to said communications device, wherein said magnetic core has a radial thickness, wherein said aperture has a diameter, wherein said radial thickness is less than said diameter and wherein the inductive coupler has a path loss that is less than about 10 dB.

15. The inductive coupler of claim 14, wherein said aperture has a diameter of about 1.5 inches.

16. The inductive coupler of claim 14, wherein said magnetic core is made of nano-crystalline magnetic material.

17. The inductive coupler of claim 14, wherein the inductive coupler has a primary inductance of about 1.5 μ

H to about 2.5 μ

H.

18. The inductive coupler of claim 14, wherein said magnetic core has a pair of gaps formed on opposing sides of said magnetic core, and wherein said gaps have a thickness of about 30 mils.

19. The inductive coupler of claim 14, wherein said magnetic core weighs less than about 10 pounds.

20. The inductive coupler of claim 14, wherein said secondary circuit has an rf signal transformer connected between said communications device and said secondary winding, and wherein said rf signal transformer has a turns ratio of 2:

1.

21. An inductive coupler for coupling a data signal between a communications device and a power line, comprising:

a split magnetic core having an aperture formed by a first section and a second section, said first and second sections forming a pair of gaps formed on opposing sides of said magnetic core, said aperture permitting the power line to pass therethrough as a primary winding; and

a secondary circuit having a winding passing through said aperture as a secondary winding connected to said communications device, wherein said split magnetic core weighs less than about 10 pounds.

22. The inductive coupler of claim 21, wherein each of said pair of gaps has a thickness of about 30 mils.

23. The inductive coupler of claim 21, wherein said split magnetic core is made of nano-crystalline magnetic material.

24. The inductive coupler of claim 21, wherein said aperture has a diameter of about 1.5 inches.

25. The inductive coupler of claim 21, further comprising a primary inductance of about 1.5 μ

H to about 2.5 μ

H.

26. The inductive coupler of claim 21, wherein said split magnetic core has a radial thickness, wherein said aperture has a diameter, and wherein said radial thickness is less than said diameter.

27. The inductive coupler of claim 21, wherein path loss for the inductive coupler is less than about 10 dB.

28. The inductive coupler of claim 21, wherein said secondary circuit has an rf signal transformer connected between said communications device and said secondary winding, and wherein said rf signal transformer has a turns ratio of 2:

1.

29. An inductive coupler for coupling a data signal between a communications device and a power line, comprising:

a core having an aperture through which the power line is routed to serve as a primary winding, and a secondary circuit having a secondary winding connected to the communications device, wherein the inductive coupler has a path loss of less than about 10 dB.

30. The inductive coupler of claim 29, wherein said core comprises a magnetic core having said aperture formed by a first section and a second section, wherein the secondary circuit passes through said aperture, and wherein the inductive coupler has a primary inductance of about 1.5 μ

H to about 2.5 μ

H.

31. The inductive coupler of claim 30, wherein said aperture has a diameter of about 1.5 inches.

32. The inductive coupler of claim 30, wherein said magnetic core has a radial thickness, wherein said aperture has a diameter, and wherein said radial thickness is less than said diameter.

33. The inductive coupler of claim 30, wherein said magnetic core has a pair of gaps formed on opposing sides of said magnetic core, and wherein said gaps have a thickness of about 30 mils.

34. The inductive coupler of claim 30, wherein said magnetic core weighs less than about 10 pounds.

35. The inductive coupler of claim 30, wherein said secondary circuit has an rf signal transformer connected between said communications device and said secondary winding, and wherein said rf signal transformer has a turns ratio of 2:

1.

36. The inductive coupler of claim 30, wherein said magnetic core is made of nano-crystalline magnetic material.