[SI-LIST] PWM noise current troubleshooting
- From: Doug Smith <doug@xxxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Tue, 09 Dec 2003 21:49:10 -0800
Hi All,
I have been encountering low frequency currents from pulse width
modulation controlled motors potentially causing interference to other
higher frequency circuits lately. This month's Technical Tidbit on
http://emcesd.com outlines a troubleshooting method for this type of
problem.
Abstract: Pulse width modulation controlled 3 phase motors have
become popular in numerous applications from small fractional hp
motors to giant industrial motors. Common mode currents generated by
the controller circuits and motors can cause signal interference to
other circuits at relatively low frequencies. At these low switching
frequencies used, some shielding and circuit design techniques do not
work well. The result can be interference to low level higher
frequency circuits. Troubleshooting techniques are presented.
-------------------------------------------------------
Upcoming public courses that I am teaching on high frequency
measurements and noise at the continuing education departments of
Oxford University and UC Berkeley:
* March 4-5, 2003 at UC Berkeley Extension in San Francisco, CA
http://www.unex.berkeley.edu/eng/elec/313544.html
* June 24-25, 2003 at Oxford University in Oxford, England as part of
Oxford University's Digital Design Week
http://www.conted.ox.ac.uk/cpd/electronics/courses/high_frequency_measurements.asp
Have a good month,
Doug
--
-------------------------------------------------------
___ _ Doug Smith
\ / ) P.O. Box 1457
========= Los Gatos, CA 95031-1457
_ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
/ /\ \ ] / /\ \ Mobile: 408-858-4528
| q-----( ) | o | Email: doug@xxxxxxxxxx
\ _ / ] \ _ / Website: http://www.dsmith.org
-------------------------------------------------------
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