Interaction between EMI filter and power factor preregulators withaverage current control: analysis and design considerations
Spiazzi, G.; Pomilio, J.A.
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 3, Jun 1999 Page(s):577 - 584
Digital Object Identifier 10.1109/41.767065
Summary:The effects of a nonnegligible source impedance, due to the
presence of an input EMI filter, on the stability of power factor
preregulators (PFPs) with average current control are analyzed by using
a state-space averaged model. Different from previous approaches, it
allows us to derive a simple expression for the loop gain in terms of
the converter current loop gain. The overall system stability was
studied for boost, Cuk, and SEPIC PPP topologies. Based on this model, a
simple modification of the standard current control loop is proposed
which increases the converter robustness against instabilities.
Comparison between model forecasts and experimental measurements was
carried out using two prototypes, one based on the boost topology and
the other based on the SEPIC topology, both rated at 600 W. Finally, the
model accuracy was investigated with measurements at different current
loop bandwidths
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