Current transformer

Details Current transformer Current transformer

2006-09-12

2006-09-12

Nguyen, Tuyen T (Department: 2832)

Inductor devices

Coils of special configuration

Toroidal

C336S200000

Reexamination Certificate

active

07106162

ABSTRACT:
A current transformer includes a Rogowski coil, having an opening at the center in which a conductor penetrates, comprising, a printed circuit board having a plurality of layers forming at least first to fourth circuit board surfaces including a circuit board top surface, a circuit board bottom surface and circuit board conducting internal surfaces between the circuit board top surface and the circuit board bottom surface, a plurality of radial metal foils, each metal foil radiating from a center that is approximately the center of the opening, mounted on the first to fourth circuit board surfaces, a first winding formed by electrically connecting metal foils on the first and second circuit board surfaces with first plated through holes penetrating the first and second circuit board surfaces in a thickness direction of the printed circuit board, a second winding formed by electrically connecting metal foils on the third and fourth circuit board surfaces with second plated through holes penetrating the third and fourth circuit board surfaces in a thickness direction of the printed circuit board, a first return circuit line electrically connected with the first winding in series, a second return circuit line electrically connected with the second winding in series, and a pair of the first winding and the first return circuit line and a pair of the second winding and the second return circuit line being electrically connected in series.

REFERENCES:
patent: 3668587 (1972-06-01), Foster
patent: 4803425 (1989-02-01), Swanberg
patent: 5055816 (1991-10-01), Altman et al.
patent: 5414400 (1995-05-01), Gris et al.
patent: 6822547 (2004-11-01), Saito et al.
patent: 2003/0090356 (2003-05-01), Saito et al.
patent: 6-176947 (1994-06-01), None
patent: 2000-228323 (2000-08-01), None

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