A prediction model for electromagnetic interferences radiated by an industrial power drive system

Power conversion systems and, in particular, power drives, are now present in a large number of applications and environments. The switching operation s of power drive systems (PDS's) are sources of radiated and conducted EMI' s that give rise to problems of electromagnetic compatibility (EMC) with ot her systems, This paper proposes an efficient numerical technique to evalua te the radiated emissions due to a PDS, taking into account the radiation f rom intentional apertures (i.e., those for ventilation). The power section of the PDS is simulated by a combination of radiating dipoles in which the current is known. The radiated electromagnetic (EM) held induces on the PDS metallic cage surface currents that, in turn, radiate outside the cage. Th ese currents are computed by an efficient numerical method known as Partial -Element Equivalent Circuit technique. The proposed prediction model is, he nce, able to predict the total radiated emission from a PDS in its design s tage in order to fulfill the EMC requirements called for by the internation al standards.