Sensitivity Analysis of Parasitics in Power Electronic Circuit through Sobol’ Indices

This paper provides a sensitivity analysis of the conducted emissions from a power converter by the means of Sobol’ indices. The sensitivity measures are computed by utilizing sparse Polynomial Chaos expansions, thanks to which the number of simulations is smaller than that required by standard Polynomial Chaos methods and far smaller than in Monte Carlo approaches. The method developed in the paper quantifies the impact of parasitic elements, modeled as 18 independent random variables, on the common and differential mode voltage in the frequency range between 150 kHz and 30 MHz and consequently identifies the key influential parameters amongst all the parasitic parameters. The advantage of the approach is that it significantly reduces the complexity of the further analysis needed to reducing conducted emissions in a power electronic circuit.