Common-mode EMI filter with a separately wound ground winding

Details Common-mode EMI filter with a separately wound ground winding Common-mode EMI filter with a separately wound ground winding

1996-12-23

1999-10-19

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333185, 333 12, H03H 709

Patent

active

059695838

ABSTRACT:
An EMI filter and method of manufacturing thereof is described. The filter includes two or more power conductors and a ground conductor. The power conductors and the ground conductor are separately wound onto a core to form a common-mode choke. The filter may be located in an equipment chassis. Capacitors may be coupled to the choke to improve filter performance. The core may comprise at least two magnetic beads. The core material and number of turns of the conductors may be chose to control the frequency range of common-mode noise rejection. The frequency range may be that in which adequate common-mode noise rejection is achieved for a diagnostic ultrasound machine, e.g., approximately 0 to 20 MHz.

REFERENCES:
patent: 3212004 (1965-10-01), Rumoller
patent: 4259705 (1981-03-01), Stifter
patent: 4342013 (1982-07-01), Kallman
patent: 4723115 (1988-02-01), Apter
patent: 4761623 (1988-08-01), Schneider
patent: 5313176 (1994-05-01), Upadhyay
patent: 5461351 (1995-10-01), Shusterman
patent: 5528205 (1996-06-01), Wong
patent: 5536978 (1996-07-01), Cooper et al.
McPartland, editor, National Electrical Code Handbook, 16th ed., New York: McGraw-Hill, p. 289, 1993.
Almor Corporation, "Molded Cord & Cable Products" Brochure (1997).

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