An approximation to improve EMI passive filter condition with triple-LISN for EMI noise problem

Fixing conducted EMI problems with EMI filters is not en exact science. It normally involves a cut-and-trial process for a designer to come up with a proper filter design or approximation. As such, designing a filter is a time-consuming process for beginning engineers as well as for experienced engineers when they face new design circumstances. Due to this, predicting and solving EMI emissions related to Common Mode (CM) ones induction motor drive systems requires various frequency-dependent effects to be considered. The new conditions corresponding to the new technological improvements both software and hardware ones in our daily systems for Electro-Magnetic Interference (EMI) passive filter is considered. Thus, EMI passive filter approximation is studied on new Triple-LISN circuit structure especially for CM currents that can suppress EMI noises in some extend in the motor drive system.