Reducing the Spectral Emissions of PFC Converters by Anticontrol of Chaos
Résumé
Switch-mode power supplies usually emit electromagnetic interferences at
the switching frequency and its multiple harmonics. We propose a feedback
control method improving switch-mode power supplies electromagnetic
compatibility (spectral peaks compliance). Inducing chaos in these systems
has recently been suggested as a means of reducing these spectral emissions.
Indeed, the application of the classical method of chaos anticontrol to these
systems leads the output voltage to have an excessive ripple or an
undesirable spectrum, whereas these problems are solved with ours. We
propose here a converter, able at the same time to achieve low spectral
emission and to maintain a small ripple. The design of this controller is based
on the property that chaotified nonlinear systems present many independent
chaotic attractors of small dimensions. To confirm the efficiency of this
method, a comparison with the anticontrol method is included, together with
a numerical example clearly showing the effect of this control.
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