Electromagnetic interference suppression system for electrical e

Details Electromagnetic interference suppression system for electrical e Electromagnetic interference suppression system for electrical e

1977-05-16

1979-03-20

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307105, 333 12, 333185, H03H 702, H02J 102, H04B 328

Patent

active

041456742

ABSTRACT:
Method and apparatus for suppressing differential and common mode conducted electromagnetic interference emission in electrical equipment powered from a grounded A.C. line source without creation of a shock hazard. Differential mode interference is suppressed by connecting a capacitor across the power lines and common mode interference is suppressed by an inductor inserted in the ground lead, both positioned within the equipment case or housing. The capacitor and inductor can have substantially fixed values for a wide range of equipment. In the preferred embodiment, the inductor is constructed by winding a few turns of the ground lead itself through a high permeability, ferrite toroid positioned within the case or housing.

REFERENCES:
patent: 2015667 (1935-10-01), Fleming et al.
patent: 2165886 (1939-07-01), Daniel
patent: 2321376 (1943-06-01), Finch
patent: 2419907 (1947-04-01), Mole
patent: 2705759 (1955-04-01), Taggart
patent: 3373301 (1968-03-01), Black
patent: 3548347 (1970-12-01), Miller et al.
patent: 3555466 (1971-01-01), Bernstein
patent: 3854107 (1974-12-01), Tuchto et al.

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