Sundstrand Corporation

Hamilton Sundstrand Corporation

Sunstrand Corporation

Curtis B White

Frank Z Feng

Donal E Baker

Dwight D Schmitt

John Huss

W Kyle Anderson

Frank W Allen, Iii

Jamal Shafii

Mark F Stunkel

A low pass filter includes a differential mode filter and a common mode filter. The common mode portion of the filter includes at least one inductor and one capacitor, as well as a damping circuit with at least one capacitor. The low pass filter has a reduced weight, which is useful in circumstances in which weight is a significant factor, such as in aircraft.

Lightweight electromagnetic interference filter

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.

Common-mode EMI filter

A measuring device for measuring time varying differential-mode currents flowing in first and second conductive groups includes a low reluctance magnetic circuit including first and second portions defining first and second openings positionable to surround the first and second conductive groups. The magnetic circuit comprises a twisted loop which cancels common-mode flux produced by common-mode current flowing in the first and second conductive groups.

Current transformer for measuring differential-mode and common-mode

The present invention reduces the volume and weight of capacitive and inductance devices, particularly used in filters, by combining the capacitive elements and inductive elements into the same construction. Accordingly, alternating conducting and dielectric sheets of material are wound into a coil. The conducting sheets can be variously connected to signal lines and to ground in order to form common mode, differential mode and/or mixed mode filters.

Multilayered distributed filter

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Rockford, IL, United States of America

Curtis B White