Common-mode EMI filter

Details Common-mode EMI filter Common-mode EMI filter

1996-09-06

1998-11-17

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333185, 439620, H03H 702

Patent

active

058382160

ABSTRACT:
The present invention is an improved filter assembly for providing at least common-mode filtering. A filter assembly in accordance with the present invention includes a plurality of spaced apart electrical conductors (102) for carrying at least common-mode electrical current; a housing (104) electrically isolated from the plurality of electrical conductors and containing a portion of a length of the plurality of electrical conductors, the housing having an interior cavity (104) defined by a wall (112) having at least a partially electrically conductive section (114), the wall extending outward from two longitudinally spaced apart locations on the plurality of electrical conductors and between the plurality of electrical conductors at a position spaced from the plurality of electrical conductors to form the cavity; at least one inductive element (108) in a closed lower reluctance loop extending around the plurality of electrical conductors and electrically isolated therefrom and the electrically conductive portion of the wall to provide an inductance common to the plurality of electrical conductors; and at least one capacitive element (110), each capacitive element having an electrical contact with the electrically conductive portion of the wall and the plurality of electrical conductors to provide capacitance between the plurality of electrical conductors and the electrically conductive portion of the wall.

REFERENCES:
patent: 3435387 (1969-03-01), Reinke et al.
patent: 3538464 (1970-11-01), Walsh
patent: 3961294 (1976-06-01), Hollyday
patent: 4781624 (1988-11-01), Shepherd
patent: 5153540 (1992-10-01), Gliha, Jr.
patent: 5243308 (1993-09-01), Shusterman et al.
patent: 5337028 (1994-08-01), White

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