Enhancement of Time-Domain Electromagnetic Inverse Method for Modeling Circuits Radiations

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Comp

et al. 2018

Self Cite

This paper deals with magnetic source characterization in time domain. The basic idea is to solve the inverse problem using the measured near field radiation cartography. In order to ensure the identification procedure, the Time Reversal (TR) technique is used. This procedure allows both the spatial and temporal focusing determination by forcing waves to virtually converge to their initial source. The originality of the proposed methodology is to present a full time domain study of a magnetic source reconstruction. Indeed, this approach is particularly suitable for structures that emit non-sinusoidal radiations such as power electronic systems. First, the Electromagnetic Time Reversal (EMTR) basis are introduced. Then a simulation case study is discussed. Finally, results from an experiment test are presented to verify the proposed methodology. The measured results are in good agreement with the calculated electromagnetic fields. The experimental validation shows that compared to other identification techniques, especially those developed in the frequency domain, the proposed approach is more efficient and simple.

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Hedia

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Comp

et al. 2018

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“…For instance, unlike the far field technique, it can be performed to estimate the current distribution on microstrip traces in a printed circuit board in the high frequency or for faults locations [3][4]. In order to evaluate EM radiation in the near field region, modeling methods based on inverse problem resolution have been widely presented in the literature [3], [5][6][7][8][9][10][11]. Indeed, EMC NF measurements for inverse problems are performed in the reactive region and are generally interested in the identification of real or equivalent radiating sources in the studied structure [3], [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Time Reversal in the Near Field: Characterization of Transient Disturbances in Power Electronics

Hedia

IEEE Trans. Electromagn. Compat.

et al. 2020

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In the present paper, the electromagnetic time reversal technique (EMTR) is studied in the electromagnetic compatibility (EMC) context. The main issue addressed by this approach is to deal with EM radiating sources identification. This paper is intended to provide a time domain (TD) study of EMTR in the near field (NF) and prove its efficiency in characterizing transient disturbances in power electronics. The reconstruction of EM emissions is based on two stages. First, modeling process relies on the use of TD analytical expressions. Second, signal processing is referring to time reversal (TR) technique, which defines an inverse problem resolution. The method proposes to identify a set of equivalent dipoles. The validation is carried out experimentally using a TD measurement bench. The main purposes of this method is to extract the dipoles locations, moments and orientation. The magnetic field maps calculated at each time step using obtained equivalent sources are compared to measured distributions. Adequate agreement is achieved, which confirms the efficiency of the proposed method. In addition, for validation purposes, the equivalent model is compared to that obtained by a frequency domain (FD) method based on the standard genetic algorithms. Unlike FD, TD investigations allow characterizing transient disturbances in power electronic systems that emit strong EM interferences, by finding a sufficient equivalent model valid on a wide frequency band at once.

Time domain inverse method based on the near field technique to solve electromagnetic interference problems: application to an AC/DC flyback converter

2018

IET Power Electronics

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This study presents a time domain modelling method for sources of electromagnetic disturbance. For the identification of an equivalent model, the proposed method is based on the synchronised temporal measurements of the magnetic near field above a power electronic system. To determine the parameters of the model, the proposed methodology is combined with an optimisation method based on the genetic algorithms. Unlike the classical approaches developed in the frequency domain, the proposed method allows finding a valid equivalent model for all radiation frequencies of measured time signals. It also enables knowing the phase shift in time between the radiating sources. The proposed method is applied in order to find the equivalent radiating sources of an AC/DC flyback converter. The accuracy and precision of the proposed method are validated by the good agreement between the measured cartography of the magnetic near field and that calculated using the parameters of the developed model. Finally, the latter's parameters are used to predict the cartography of other components of the magnetic field, which will be compared with the measured cartography. The superposition of the results confirms that the identified equivalent sources can represent real sources in the studied structure.