Detection of Electromagnetic Radiations Sources at the Switching Time Scale Using an Inverse Problem-Based Resolution Method—Application to Power Electronic Circuits

Abstract

This paper presents a detailed study about the characterization of electromagnetic near-fields emitted from power electronic circuits. The approach proposed here provides a radiation model, which verifies the uniqueness of the solution using an inverse problem-based resolution method. For this purpose, the characterization method has been combined with an experimental mapping realized at the switching time scale. This mapping is based on a Fourier analysis applied on the measurements acquired from the device under study. It allowed us to trace a prior radiations map over the device under study. This radiation map is then exploited in order to validate the uniqueness of the final result, a result that has been obtained by solving the inverse problem using a genetic algorithm (GA) to optimize the highly nonlinear fitness function. The precision and the accuracy of the method have been validated by the superposition of the obtained radiation models over the circuit topology. The correlation between the sources parameters (position, orientation, geometrical parameters and currents) and the parameters corresponding to the components located at the regions defined by the radiation map has been successfully performed. This allowed us to confirm that the physical reality is respected, and to assume that we have reached the uniqueness of the solution.

Wavelet Transform-Based <sc>EMI</sc> Noise Mitigation in Power Converter Topologies

“…However, an inherent delay is produced between target noise signal and generated antiphase noise signal [23] due to the bandwidth limitation and the propagation delay of the feedback system. The spectrum analysis of the switching waveform of the metal oxide semiconductor field effect transistor (MOSFET)-based buck converter shows a clear violation of noise limit [24]. Therefore, we need an advance predictive method for the computation of the antiphase noise signal [25].…”

A full time domain methodology based on near field time reversal for equivalent source identification

“…Hence, the consideration of Electromagnetic Compatibility (EMC) modelling techniques has become a crucial solution to deal with the unwanted interferences and improve systems design. In electronics industry, devices are especially affected by noisy transient signals [1]. Therefore, to cope with the harmful Electromagnetic (EM) coupling, researchers have developed many characterization approaches for emissive systems.…”

“…To carry out an efficient EMC study, it is useful to know the EM field distribution in a near region around the circuit under test. Actually, the near field technique is considered as an appropriate approach to characterize radiating structures [1]- [9]. But, due to the expensive measurements cost, this task relies on the use of a robust numerical process.…”

“…But, due to the expensive measurements cost, this task relies on the use of a robust numerical process. In fact, the need to avoid heavy simulations realization has pushed researchers to develop new behavioural models [1]- [6]. Recently, the EM inverse problem has shown interest in characterizing radiated sources [1]- [9].…”

“…In fact, the need to avoid heavy simulations realization has pushed researchers to develop new behavioural models [1]- [6]. Recently, the EM inverse problem has shown interest in characterizing radiated sources [1]- [9]. Generally, this method is used to obtain the current flowing through emissive sources using a set of EM elemental dipoles.…”