Input filter interactions in peak-current-mode-controlled buckconverter operating in CICM
Suntio, T.; Gadoura, I.; Zenger, K.
Industrial Electronics, IEEE Transactions on
Volume 49, Issue 1, Feb 2002 Page(s):76 - 86
Digital Object Identifier 10.1109/41.982251
Summary:Peak-current-mode (PCM) control is a widely used method to control
switched-mode converters. Most often an input filter is necessary to
meet electromagnetic interference requirements. The input filter can
cause instability and degradation of input and output dynamics if not
properly designed. The input filter design from the output dynamics
viewpoint has been addressed in numerous papers, resulting in
well-agreed results in the case of direct duty-ratio control. The same
methods and criteria have also been applied to PCM control, but the
results have turned out to be conflicting. This paper shows that the
adverse effect of the input filter on the output performance of a
peak-current-controlled buck converter in continuous inductor-current
mode is insignificant. The input performance is, however, significantly
affected, necessitating the use of proper damping. It is also shown that
the instability is caused solely by the instability of the input filter
under negative incremental resistance. The methods used are unified in
nature, but the results obtained in this study cannot be generalized to
be valid for types of converters other than a buck converter
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