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Investigation of magnetic field immunity and near magnetic field reduction for the inductors in high power density design

This paper investigates the magnetic field immunity and near magnetic field reduction for different inductor winding structures. A novel double-twisted winding structure, which includes two magnetic cores, is proposed for CM inductors. The proposed CM inductor can achieve much lower near magnetic field emission, much better magnetic field immunity against the external magnetic field and much bigger DM impedance than conventional winding structures. Theoretical analysis, magnetic 3D simulations and experiments were conducted to validate the proposed technique.