[Back]

M.L. Heldwein, H. Ertl, J. Biela, J.W. Kolar:
"Implementation of a Transformer-Less Common Mode Active Filter for Off-Line Converter Systems.";
Talk: Annual IEEE Applied Power Electronics Conference and Exposition, Dallas, Texas, USA; 2006-03-19 - 2006-03-23; in: "Proceedings of the Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition", Vol.2 (2006), ISBN: 0-7803-9547-6; 1230 - 1236.

This work presents a study and practical
implementation of an active filter employing a HF power amplifier
and passive filter components to be connected to the AC power
lines in order to mitigate common mode conducted emissions
of PWM converter systems. The filter topology is chosen from
different possibilities listed in a literature survey and studied
regarding practical implementation issues. Special attention is
put on the stability analysis where the challenges for the feed-
back structure are discussed and a simple feedback structure
is proposed. A prototype is designed and built, from which
mathematical and experimental results are obtained
demonstrating the potential and limitations of such a system.
broadly employed in signal processing, where low current and voltage
levels are present. But, as power levels increase, the construction of
such systems becomes critical, once wide-band amplifiers are to be
used, which should be able to handle high current and voltage levels.
This challenge motivates research in this field and is addressed in the
following.
The scope of this work is limited to the common mode (CM) con-
ducted emissions mainly in the frequency range of 150 kHz to 30
MHz. The connection of the EMC filter to the power circuits is
thought to be on the AC mains side where a large 50 or 60 Hz
frequency component is present, along with its low frequency harmonic

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06586103