The invention relates to a filtering device connected between a rectifier
module of a variable speed drive and an alternating current power supply
network, the filtering device comprising an EMC filter comprising a
common-mode inductor having a winding on each phase of the power supply
network, the windings being magnetically coupled together. The filtering
device comprises a shunt circuit connected in parallel with at least one
of the windings of the common-mode inductor, the shunt circuit comprising
passive components and making it possible to shunt a common-mode current
flowing in the common-mode inductor in a frequency zone about a resonance
frequency of the EMC filter.