Circuit and field interaction in hysteretic media: Part II) medium frequency behavior of the Epstein measurement circuit

摘要

Using a simulation technique based on the Dynamic Preisach Model we evaluate the interplay between non-linear hysteresis effects in magnetic materials and circuit parameters. In the case of the Epstein circuit. In these transformer circuits. Used for standard magnetic characterization. Stray capacitive effects and secondary impedance may cause an undesired current flow influencing the measurement results in medium frequency conditions. Using the dynamic Preisach model of hysteresis. Taking into account both the magnetic material characteristics stray parameters and the secondary load it is possible to simulate with high accuracy the input Current and output voltage waveforms at various frequencies. Under sinusoidal flux conditions. as prescribed by IEC standards or under sinusoidal or distorted exciting Current as in many industrial applications.