The knowledge of the magnetic characteristic of an inductor is a key factor for the design of filters of power converter systems for electric grid interfaces. The accurate and reliable definition and measurement of the parameters such as the differential inductance, the saturation level and the linearity range is a difficult task, in particular for high current inductors. In this paper a comparison between different methods of measure of the magnetic characteristic of a gapped filtering inductor versus current, in the range from zero magnetization to the saturation, is presented and discussed. It is shown that the different measurement methods provide appreciable differences in the evaluation of the magnetic characteristic of a benchmark inductor. The differences found are also analyzed by suitable numerical simulations.
Faba, A., Rimal, H.P., Laudani, A., Chilosi, F., Cardelli, E. (2022). Measurements of magnetic characteristics of laminated Fe-Si steel filter inductors in grid interface converters. MEASUREMENT, 195, 111108 [10.1016/j.measurement.2022.111108].