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Adjustable Electromagnetic Interference Filter

IP.com Disclosure Number: IPCOM000100339D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Satoh, J: AUTHOR

Abstract

Disclosed is the adjustable inductance EMI (Electromagnetic Interference) filter which is suitable to mount on a printed circuit as shown in Figs. 1 and 2. The filter consists of two similar ferrite cores 2 which bind the rubber ring 7.

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This is the abbreviated version, containing approximately 100% of the total text.

Adjustable Electromagnetic Interference Filter

       Disclosed is the adjustable inductance EMI
(Electromagnetic Interference) filter which is suitable to mount on a
printed circuit as shown in Figs. 1 and 2.  The filter consists of
two similar ferrite cores 2 which bind the rubber ring 7.

      The high frequency source is added from 4 and passes the coil
pattern 6; then, the high frequency power will be reduced by the
inductance.

      The ferrite core has gap 8 which is adjustable by changing the
screw binding force 9 to the rubber ring 7 to have variable
inductance.

      Most printed circuit boards have a ground and voltage supply
pattern 10 which provides a good shielding effect for the high
frequency and the output 5 is connected via the through-hole 11 to
protect the induced high frequency on the output land 5.

      The ground and voltage pattern must be eliminated around the
ferrite cores to create effective inductance.