Thevenin black box model to characterize conducted electromagnetic interference of DC/AC converters for aerospace applications

This article focuses on behavioral modelling of power systems, specifically DC/AC converters to evaluate electromagnetic (EM) interferences as conducted emissions current, at both inputs and outputs. A linear equivalent model of the converter is proposed as a five-port black box model, which allows for interaction between the input and output ports. To implement it, we associated it with experimental setups for measuring impedance and currents in frequency domain. The experimental setup only provides the amplitude of the current, so three hypotheses were proposed to determine the phase shift between the currents. To validate our model, we compare the measurements and calculations of current in common mode in conducted emissions for these three hypotheses.