The Bridge - Issue 2, 2022 - 14

Feature
Common-Mode Current is in Your Future!
both conductors " 1 " and " 2 " , the differential-mode
current vectors would sum to zero, while the two
common-mode current vectors would add. The
common-mode current thus measured tells us the
amount of " net " current that flows in one direction.
Noise current measurements are a little different from
the differential-mode current measurements in many
undergraduate electrical engineering laboratories,
where usually the current probe is placed around
only one conductor at a time. When teaching or
describing real noise troubleshooting examples that
involve common-mode current, it is helpful to define
whether Icm
represents the total noise current flowing
in one direction, or the amount of noise current
flowing on each conductor. If the former, we might
/2 for each of the two wires, so that the
measured noise current would equal just Icm
FOR MORE INFORMATION, SEE:
.
Introduction to Electromagnetic Compatibility,
Clayton R. Paul, 2nd Edition, Wiley Interscience, 2006.
Electromagnetic Compatibility Engineering,
Henry W. Ott, Wiley Interscience, 2006.
Lee Hill has over 30 years of
experience in hardware troubleshooting
and design reviews to solve and
prevent elusive regulatory and
functional electrical noise problems. He
is Founding Partner of SILENT Solutions
LLC and GmbH, an electromagnetic
compatibility (EMC) and RF design,
troubleshooting, and training firm
Fig. 6: Measurement approach for common-mode current.
established in 1992, see https://silent-solutions.com/. Lee
teaches EMC worldwide and is a member of adjunct faculty at
Worcester Polytechnic Institute (WPI) and an EMC instructor
at University of Oxford (England). He is active in the IEEE
EMC Society and related conferences. He earned his MSEE in
electromagnetics from the EMC Laboratory at Missouri University
of Science and Technology, where he studied under Dr.'s Tom
Van Doren, Todd Hubing, and James Drewniak.
assign Icm
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The Bridge - Issue 2, 2022

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