EMI Worsening in a SMPS with Non-linear Inductor
DOI:
https://doi.org/10.24084/repqj20.352Keywords:
electromagnetic interference (EMI) filter, Switched Mode Power Supply, power density, nonlinear magnetics, saturable core, inductorAbstract
This paper is focused on the input current in a Switched Mode Power Supply (SMPS) in which the power inductor is exploited up to the saturation showing a non-linear behaviour. The input current exhibits a distortion due to the non linearity. The electromagnetic interference (EMI) caused by the ripple at switching frequency, superimposed to the DC value of the input current, requires a suitable design of the input differential mode (DM) filter. The input current is analyzed both in the time and frequency domain for different operating conditions, and it is compared to a SMPS equipped with a traditional linear inductor.