Electrical Model Validation of Magnetic Cores for Current Sensing and Loop Filter Applications

Exploitation of magnetic materials for Electromagnetic Interference (EMI) filtering applications is inevitable in real inverter applications. In order to evaluate filter design, component characterization is vital and similarly predicting the real behavior of components is mandatory. The design of EMI filter varies case per case, however the utilization of magnetic materials is indispensible, therefore a better understanding of magnetic materials is required. Basic inductor models with parallel RLC circuits are not sufficient to produce an equivalent circuit model, thus information on multi-resonance phenomena along with various parasitic elements is required. This paper discusses a comprehensive validation study where the simulated circuit model will be compared with measurement results obtained from a real electric drive (eDrive) system. Moreover, a comprehensive study for core saturation behavior based on measurement results will be included. The aim of this study is to model an equivalent circuit for magnetic materials which can be employed as current sensors in Active EMI Filter (AEF) applications or as common-mode transformer (CMT) in loop filter applications.