Effectiveness of Shielding on the Magnetic Emissions Emitted by a Toroidal Inductor

In this paper, we present the effectiveness of magnetic shielding as a function of frequency and the pulse signal voltage applied to the terminals of the toroidal inductance in the near field using experimental measurements in the frequency domain by spectrum analyzer. Firstly, the magnetic field cartography of all components (H X , H Y , H Z ) by a scan on the surface of the inductance was determined. Then the radiated emissions with and without shielding were determined. Once in varying the frequency, keeping the voltage amplitude and duty cycle constants, and in the other hand, in varying the voltage amplitude, keeping the frequency and duty cycle of pulse signal constants for two distances Z between the magnetic probe and the top of the inductor surface. The shielding material that we used is aluminum foil of diameter about 0.1 mm.