Literatura científica selecionada sobre o tema "Condensateurs à films métallisés"
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Artigos de revistas sobre o assunto "Condensateurs à films métallisés"
Joubert, Ch, G. Rojat e A. Béroual. "Homogénéisation des matériaux constituant les condensateurs bobinés à films métallisés". Journal de Physique III 7, n.º 7 (julho de 1997): 1549–59. http://dx.doi.org/10.1051/jp3:1997207.
Texto completo da fonteHaidara, H., Y. Papirer, M. F. Vallat e J. Schultz. "Adhérence de films polymères métallisés : influence de la structure de l’interface et de la morphologie du dépôt." Revue de Métallurgie 91, n.º 9 (setembro de 1994): 1235. http://dx.doi.org/10.1051/metal/199491091235.
Texto completo da fonteLAVILLE, Henri, Tchavdar DOYTCHINOV, Antoine DIDION e Gregory DOUGLADE. "Condensateurs électrochimiques et condensateurs films - Technologies et évolution". Électronique, novembro de 2018. http://dx.doi.org/10.51257/a-v1-e1926.
Texto completo da fonteTeses / dissertações sobre o assunto "Condensateurs à films métallisés"
El-Husseini, Mohamad-Hussein. "Amélioration de la fiabilité des condensateurs à films polypropylène métallisés". Lyon 1, 2001. http://www.theses.fr/2001LYO10265.
Texto completo da fonteJoubert, Charles. "Etude des phénomènes électromagnétiques dans les condensateurs à films métallisés - nouvelle génération de condensateurs". Phd thesis, Ecole Centrale de Lyon, 1996. http://tel.archives-ouvertes.fr/tel-00002565.
Texto completo da fontePar ailleurs, les modèles élaborés ont permis de mettre en évidence l'influence des paramètres géométriques sur les performances des condensateurs, en particulier en haute fréquence. Ainsi, de nouvelles structures - plates et annulaires - permettent de minimiser les impédances propres des bobinages. L'efficacité des condensateurs de découplage peut aussi être améliorée grâce à des connexions appropriées et l'utilisation de conducteurs symétriques réduit les échauffements.
Siami, Shidoush. "Modélisation fréquentielle des condensateurs à films métallisés : nouvelles structures de condensateurs à inductance réduite". Toulouse, INPT, 1997. http://www.theses.fr/1997INPT047H.
Texto completo da fonteGuilet, Stéphane. "Amélioration et caractérisation de l'autocicatrisation dans les condensateurs à films de polypropylène métallisés". Nantes, 2003. http://www.theses.fr/2003NANT2108.
Texto completo da fonteIn this study, we describe a way to improve self-healing in metallized polypropylene (PP) films capacitors. A PECVD (Plasma Enhanced Chemical Vapor Depositon) thin nitride organosilicon (or SiNOCH) coating is deposited on the surface of the PP film just before the metallization with zinc. The low pressure and high density plasma is inductively coupled and the gas mixture is made with HMDSO (hexamethyldisiloxane) and N2. FTIR (Fourier Transform Infra-Red) and XPS (X-ray photoelectron spectrometry) measurements are leading to the characterization of the composition and the structure of the thin coatings, while OES (Optical Emission Spectroscopy) provides information on the composition of the gaseous phase. Then, we have measured the current and voltage variations during self-healing and the size of the demetallized surface. Evidence has been made that a thin SiNOCH coating is useful since it allows to divide by a factor three the electrical energy needed for self-healing. In order to understand self-healing mechanisms, we analyzed the self-healed metallized polypropylene film surface by chemical imaging and spatially resolved XPS. The self-healing process leads to a cleared PP surface around the breakdown point. Moreover, a fraction of the coatings SiNOCH and Zn is deposited at the frontier between the cleared surface and the metallized surface
Makdessi, Maawad. "Modélisation, vieillissement et surveillance de l'état de santé des condensateurs films utilisés dans des applications avioniques". Phd thesis, Université Claude Bernard - Lyon I, 2014. http://tel.archives-ouvertes.fr/tel-01058227.
Texto completo da fonteRochefort, Claire. "Analyse du vieillissement, estimation de la durée de vie et méthode de surveillance de l’état de santé des condensateurs à film métallisé". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10183.
Texto completo da fonteWidely used, the metallized film capacitors are a common cause of electronic system failure. Some of their failures can lead to serious accidents and severe damage to their surroundings, such as explosions or fires. In addition to these safety issues, the failures analysis is justified by the economic issues related to the maintenance of these systems. The objective is to estimate the remaining useful lifetime and to prevent the sudden failures. Nowadays, the most used ageing laws require performing preliminary ageing tests to identify their parameters and enable their extrapolation. These parameters strongly depend on the series and the manufacturer of the capacitor itself. For these reasons, these ageing laws are costly to use and not robust. Other types of laws based on stochastic processes and related to failure mechanisms are emerging. However, their robustness and predictive capability need to be evaluated. Finally, even if measures are implemented to reduce the occurrence of catastrophic failures, risks persist. There is a need to prevent these types of failures without solely relying on the internal characteristics and the background of the capacitors. To address these issues, this work was carried out in collaboration with Schneider Electric as part of a CIFRE contract. Several accelerated ageing tests were carried out on a total of 111 capacitors from different manufacturers. The first test campaign focused on ageing under fixed conditions of alternating voltage and temperature, while the second added the additional constraint of humidity. Post-mortem analysis revealed that the different ageing campaigns led to the prevalence of a specific type of failure mechanism. The first campaign highlighted the effects of self-healing, and the second, those of corrosion. Based on these results, models of the capacitance evolution according to these two mechanisms were established. These were validated by the data in comparison to some existing laws. A first model based on the metallization resistance degradation due to self-healing effects was also proposed. Simultaneously, a large number of thermal runaways on capacitors were observed. Through real-time health indicator measurements, an in-depth study of the process was conducted. Early signs of thermal breakdown were identified. These results enable the early detection of thermal runaway and the implementation of damage prevention measures. Based on this principle, a generic method for preventing the risk of thermal breakdown was proposed. Its feasibility has been demonstrated and experimentally evaluated
Tortai, Jean-Hervé. "Etude expérimentale et modélisation de l'autocicatrisation d'un film de polypropylène métallisé". Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10223.
Texto completo da fonteManfroi, Olivier. "Contribution à l’étude des charges carbonées et des films de supercondensateurs à électrolyte organique". Nancy 1, 2005. http://www.theses.fr/2005NAN10162.
Texto completo da fonteThis work is dedicated to the survey of the carbonated compounds and the composite films of supercondensateur to organic electrolyte. We have in a first time approached the carbonated compounds, main materials of the composite films. This materials has been characterized so much to the point of view of the morphology of the carbon skeleton that of the chemistry surface. The modifications of the functional groupings show the ominous impact of these groupings on the ageing of the component. The clarification of macroscopic original methods of characterization of the composite movies permitted to approach the influence of the parameters of realization on the properties of the films. Finally, the analysis of the competition situates the Batscap films and put in evidence the existence of a layer interfaces, gate to the diffusion of the ions, between the collector and the composite film
BONNEL, DE LONGCHAMP NATHALIE. "Etude de phenomenes transitoires dans les films minces. Premiere partie : auto-regeneration dans les condensateurs a film metallise. seconde partie: commutation supra-normal dans ybacuo epitaxie". Paris 7, 1992. http://www.theses.fr/1992PA077025.
Texto completo da fonteTetsi, Emmanuel. "Développement de films minces à base de nanoparticules diélectriques et optimisatisation des conditions de dépôt pour fabriquer des condensateurs de découplage utilisés dans des assemblages à haute densité de modules électroniques". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0113/document.
Texto completo da fonteWithin the three-dimensional (3D) integration associated with the use of an increasing amount of integrated circuits (ICs), there is strong need of high capacitance density (≥ 1 μF.cm-2) decoupling capacitors, able to operate on large frequency bandwidth, in order to reduce the noise that can compromise the signal integrity in ICs. The main challenge of these capacitors relies on the deposition of thin films (≤ 100 nm) using innovative materials with high relative permittivity (ε_r > 200 à 1 GHz) and «low cost» technologies compatible with large scale integration.On one hand, the proposed approach in this thesis benefits from the possibility of synthetizing – by the supercritical fluid technology – and using Ba0.6Sr0.4TiO3 (BST) nanoparticles (Ø = 16 ± 2 nm, ε_r = 260 at1 kHz) as dielectric material and on the other hand, from the use of spray coating as technique for the deposition of these materials as thin films. First of all, the BST nanoparticles synthesized are functionalized with specific ligands (3-aminopropylphosphonic acid, APA), in order to obtain colloidal suspensions composed by aggregates with size (Ø < 100 nm) showing few fluctuations during two months. The other function of ligands is to improve the adhesion of the deposited films (self-assembling) on the copper (Cu) substrate. Different solvent are studied for the preparation of the solutions : N-méthyl-2-pyrrolidone (NMP), water, methanol and ethanol. The variation of different parameters related to the solution and the deposition technique helped us to define the optimal conditions leading to different thickness of film (200 – 1000 nm) based on pristine (BST) and functionalized nanoparticles (BST-APA). Using ethanol instead of NMP as solvent, enabled us to prevent de formation of a copper oxide layer and organic residues. After deposition of aluminum pads (Al) on BST or BST-APA films and used as top electrode, the capacitance-voltage (C-V) and current-voltage (I-V) characteristics of capacitors with metal-insulator-metal (MIM) structure enabled us to achieve high capacitance density (~ 0.7 μF.cm-2) and low leakage current (~ 25 μA.cm-2) at 1 V.Keywords: MIM capacitors, thin films, supercritical fluids, Ba0.6Sr0.4TiO3, spray coating, nanofabrication in cleanroom