Current/voltage detection printed board and current/voltage detector

• US 8,179,122 B2
• Filed: 08/29/2008
• Issued: 05/15/2012
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Daihen Corporation
• Original Assignee: Daihen Corporation
• Inventors: Ibuki, Yoshifumi
• Primary Examiner(s): Phan, Huy Q
• Assistant Examiner(s): ISLA, RICHARD
• Application Number:
  US12/201,295
• Publication Number:
  US 20090058398A1
• Time in Patent Office: 1,355 Days
• Field of Search: 336200-232, 324/117.R
• US Class Current: 324/127
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils

Abstract

A printed board, includes: a first shield portion, configured to reduce an influence of an electric field in combination with a casing accommodating the printed board, at least a part of the first shield portion being formed with a plurality of through holes; and a second shield portion, configured to reduce the influence of the electric field in combination with the casing, at least a part of the second shield portion being formed with a plurality of through holes, wherein the second shield portion is arranged alongside of the first shield portion.

Claims

1. A current/voltage detector, comprising:

a casing main body formed of an electrical conductor; and

a printed board mounted within the casing main body, wherein the printed board comprises;

a first shield portion, configured to reduce an influence of an electric field, and comprising a first plurality of through holes arranged in a first circuit, the first shield portion electrically connected to the casing main body; and

a second shield portion, configured to reduce the influence of the electric field, and comprising a second plurality of through holes arranged in a second circuit, the second shield portion electrically connected to the casing main body, wherein

the second circuit is arranged alongside the first circuit and surrounds the first circuit.

2. The current/voltage detector according to claim 1, wherein each of the first shield portion and the second shield portion includes an unshielded portion.

3. The current/voltage detector according to claim 1, wherein no unshielded portion is provided with respect to the first shield portion and the second shield portion.

4. The current/voltage detector according to claim 1, wherein each of the first plurality of through holes includes an upper through hole and a lower through hole and does not pass through the printed board.

5. The current/voltage detector according to claim 1, wherein each of the first plurality of through holes and each of the second plurality of through holes includes an upper through hole and a lower through hole and does not pass through the printed board.

6. A printed board, configured to detect an AC current flowing in a power transmission conductor and an AC voltage generated in the power transmission conductor, the power transmission conductor being used as an AC power transmission path, the printed board comprising:

a first wire, configured to detect the AC voltage;

a shield portion, configured to reduce an influence of an electric field of the AC current in combination with a casing accommodating the printed board, at least a part of the shield portion being formed with a plurality of through holes; and

a second wire, configured to detect the AC current, wherein;

the printed board is formed with a penetration hole;

the first wire is provided between the penetration hole and the shield portion and capacitively couples to the power transmission conductor when the power transmission conductor is positioned within the penetration hole; and

the shield portion is provided between the first wire and the second wire.

7. The printed board according to claim 6, wherein the plurality of through holes are arranged in a substantially circular shape.

8. The printed board according to claim 6, wherein each of the plurality of through holes includes an upper through hole and a lower through hole and does not pass through the printed board.

9. A printed board, configured to detect an AC current flowing in a power transmission conductor and an AC voltage generated in the power transmission conductor, the power transmission conductor being used as an AC power transmission path, the printed board comprising:

a first wire, configured to detect the AC voltage;

a shield portion, configured to reduce an influence of an electric field of the AC current in combination with a casing accommodating the printed board, at least a part of the shield portion being formed with a plurality of through holes; and

a second wire, configured to detect the AC current,

wherein the printed board is formed with a penetration hole,

the first wire is provided between the penetration hole and the shield portion,

the shield portion is provided between the first wire and the second wire, and

the plurality of through holes are arranged in a substantially circular shape and in at least two lines.

10. A detector, configured to detect an AC current flowing in a power transmission conductor and an AC voltage generated in the power transmission conductor, the power transmission conductor being used as an AC power transmission path, the detector comprising:

a casing; and

a printed board, comprising;

a first wire, configured to detect the AC voltage;

a shield portion, configured to reduce an influence of an electric field of the AC current in combination with the casing accommodating the printed board, at least a part of the shield portion being formed with a plurality of through holes; and

a second wire, configured to detect the AC current, wherein;

the printed board is formed with a penetration hole;

the first wire is provided between the penetration hole and the shield portion and capacitively couples to the power transmission conductor when the power transmission conductor is positioned within the penetration hole;

the shield portion is provided between the first wire and the second wire; and

the casing covers the printed board excluding the penetration hole.

11. The detector according to claim 10, wherein the plurality of through holes are arranged in a substantially circular shape.

12. The detector according to claim 10, wherein the shield portion includes an unshielded portion where the influence of the electric field is not reduced.

13. The detector according to claim 12, wherein the unshielded portion is provided between a first surface and a second surface of the printed board.

14. The detector according to claim 12, wherein the unshielded portion is provided between the printed board and the casing.

15. The detector according to claim 10, wherein the casing includes:

a main body, configured to fix the printed board; and

a cover portion, configured to accommodate the printed board.

16. The detector according to claim 10, wherein

the printed board includes a plurality of layers laminated to each other;

the first wire is formed with a plurality of through holes arranged at the periphery of the penetration hole, the through holes penetrating between at least a part of the layers; and

the first wire includes a pattern wire connecting the through holes.

17. The detector according to claim 10, wherein the AC current has a frequency of a radio frequency band.

18. The detector according to claim 10, wherein each of the plurality of through holes includes an upper through hole and a lower through hole and does not pass through the printed board.

19. The detector according to claim 10, wherein the casing includes a casing shield portion comprising an electrical conductor, and the plurality of through holes are connected to the casing shield portion.

20. A detector, configured to detect an AC current flowing in a power transmission conductor and an AC voltage generated in the power transmission conductor, the power transmission conductor being used as an AC power transmission path, the detector comprising:

a casing; and

a printed board, comprising;

a first wire, configured to detect the AC voltage;

a shield portion, configured to reduce an influence of an electric field of the AC current in combination with the casing accommodating the printed board, at least a part of the shield portion being formed with a plurality of through holes; and

a second wire, configured to detect the AC current,

wherein the printed board is formed with a penetration hole,

the first wire is provided between the penetration hole and the shield portion,

the shield portion is provided between the first wire and the second wire,

the casing covers the printed board excluding the penetration hole, and

the plurality of through holes are arranged in a substantially circular shape and in at least two lines.