VARIABLE SPEED DRIVE PROVIDED WITH A COMMON-MODE FILTERING DEVICE

摘要

The invention relates to a variable speed drive, comprising a filtering device connected between the rectifier module (20) thereof and the AC power supply mains (40), and comprising a EMC filter consisting of a common-mode inductor (LF) having a winding provided on each power supply line, said windings being magnetically coupled together, and common-mode capacitors (CF) connected to each power supply line downstream from the common-mode inductor, the variable speed drive further comprising means (50, 51) for detecting a state of saturation of the EMC filter, said detection means interacting with the control unit (100) of the inverter module (10) in order to perform PWM control on the inverter module (10) when a state of saturation of the EMC filter is detected.