Classifications of the active filter topologies, used in controlling
EMI, are given in [9], [11], and [30]. According to
these classifications, the proposed circuit is a feedback voltagesensing,
voltage-compensating type, shown in Fig. 1, and it
behaves as a Butterworth low-pass filter. The main advantage
of this choice lies on the good performance of the considered
scheme in canceling the CM voltage at the motor input, due to
the maximization of the filter insertion loss (IL) for the case
under study [9], [26]. The main features of the chosen topology
are summarized in Table I.