Individual information

Power electronic converters produce conducted electromagnetic interferences (EMI) on a wide frequency band. To prevent the perturbation of the electrical grid and ensure compliance of the static converter with electromagnetic compatibility (EMC) standards, EMI filters must be installed at the input of the converter. To design these filters by simulations, a high-frequency model of the entire energy conversion system is required. The model type selection is determined by whether or not the conversion system is already operational or in the design phase. For systems that are already implemented, the "Terminal Modeling" (TM) approach, which considers the converter and its load as a black-box or gray-box model, is particularly well-suited. In this study, due to the drawbacks of the "black box" model, we propose to use a "gray box" model for a DC-DC conversion system. The aim is to improve methods for experimental identification of parameters for these models. The simulation results of the conducted emissions will be compared with those measured in the frequency band from 1 MHz to 100 MHz.

Power electronics converters generate conducted electromagnetic interference (EMI) over a wide frequency range. In order to prevent pollution of the electrical network and thus comply with electromagnetic compatibility (EMC) standards, it is necessary to install filters at the input side of converters. The optimal design of these filters requires modeling the entire energy conversion system and using the proposed models in circuit simulations (SPICE, etc.). Depending on whether the conversion system is already implemented or in the design stage, there are several modeling methods. When the system is already implemented, the method that treats the converter with its load as a black-box model, called “Terminal Modeling” is particularly suitable in this case. In this paper, we highlight its limitations and propose a gray-box model to enhance its accuracy and robustness up to 100 MHz.

Les convertisseurs d’électronique de puissance génèrent des perturbations électromagnétiques conduites dans une large bande de fréquences. Afin d’éviter de polluer le réseau électrique et respecter ainsi les normes de compatibilité électromagnétique (CEM), il est nécessaire d’installer des filtres à l’entrée des convertisseurs. Le dimensionnement optimal de ces filtres CEM nécessite une modélisation de l’ensemble du système de conversion d’énergie puis l’utilisation des modèles proposés dans des simulations de type circuit (SPICE …). Selon les cas où le système de conversion est déjà réalisé ou au stage de conception, il existe plusieurs méthodes de modélisation. Lorsque le système est déjà réalisé, la méthode, qui considère le convertisseur avec sa charge comme un modèle boîte noire, appelée “Terminal Modeling” est particulièrement adaptée dans ce cas. Dans ce papier, on met en évidence ses limites puis on propose un modèle de type boîte grise afin d'améliorer sa précision et sa robustesse jusqu'à 100MHz.