Resonance Mode Analysis on Conducted Emissions of an Inverting Buck–Boost Converter

Electromagnetic compatibility simulation of switched-mode power supplies is crucial to predict the electromagnetic emissions resulting from switching voltages and currents. A straightforward method for identifying electrical components that cause increased conducted emissions due to parallel resonances is presented. The eigenfrequencies of a DC-DC converter are determined by performing a resonance mode analysis with the aim to quantify the main contributors to differential and common mode noise. The results are compared to those obtained using the Morris method for global sensitivity analysis on the frequency response of AC simulations. A link is found between the modal energy distribution and the Morris absolute contribution for resonances affecting both differential and common mode emissions.