Download or read book Prise en compte des m canismes de commutation dans les simulateurs d lectronique de puissance written by Bernard Dhalluin and published by . This book was released on 1990 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'etude realisee concerne la modelisation comportementale d'interrupteurs de puissance permettant l'etude globale du fonctionnement d'un convertisseur et l'analyse des changements d'etat. En examinant les interactions entre l'interrupteur et son environnement pendant les commutations, nous montrons que le comportement d'un interrupteur est identique a celui d'un limiteur de vitesse de courant et de tension. Pour valider ces concepts, nous developpons un limiteur de vitesse de courant, servant de base a l'elaboration des micromodeles d'interrupteur bicommandable et de la diode. Le simulateur de convertisseurs statiques simrese a permis l'implantation des micromodeles proposes. Apres une description complete de l'aspect fonctionnel du logiciel, nous presentons les modifications apportees dans le code de calcul pour d'une part augmenter la precision du simulateur et, d'autre part favoriser l'introduction des micromodeles. Ils sont valides a partir de cas concrets et quelques exemples d'exploitation sont presentes

Download or read book CONTRIBUTION A LA SIMULATION ELECTROTHERMIQUE EN ELECTRONIQUE DE PUISSANCE DEVELOPPEMENT D UNE METHODE DE SIMULATION POUR CIRCUITS DE COMMUTATION SOUMIS A DES COMMANDES VARIABLES written by PATRICK.. VALES and published by . This book was released on 1997 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LES CIRCUITS DE PUISSANCE CONCUS ACTUELLEMENT, LES EFFETS ELECTROTHERMIQUES NE PEUVENT PLUS ETRE IGNORES. UNE METHODOLOGIE EST PROPOSEE EN VUE DE LA SIMULATION COMPORTEMENTALE DES CIRCUITS DE PUISSANCE SOUMIS AUX INTERACTIONS ELECTROTHERMIQUES. L'OBJECTIF EST DE CREER UN LOGICIEL QUI OPTIMISE LE TEMPS DE CALCUL TOUT EN TENANT COMPTE DES CONSTANTES DE TEMPS ELECTRIQUE ET THERMIQUE QUI SONT GENERALEMENT TRES DIFFERENTES. UN PROGRAMME SUPERVISEUR ECRIT EN FORTRAN, GERE AU MOYEN D'APPELS SYSTEME, UN DIALOGUE INTERACTIF ENTRE UN SIMULATEUR THERMIQUE RAPIDE ET UN SIMULATEUR ELECTRIQUE GENERAL. CE PROCESSUS DE COUPLAGE EXPLICITE ENTRE DEUX SIMULATEURS SPECIFIQUES, NECESSITE UN ENVIRONNEMENT DE TRAVAIL MULTITACHE. LE LOGICIEL DEVELOPPE, PERMET DE PREVOIR LA DERIVE DE LA PUISSANCE DISSIPEE DANS LA ZONE ACTIVE DES COMPOSANTS, AINSI QUE LES EFFETS DU COUPLAGE THERMIQUE ENTRE COMPOSANTS VOISINS. LA METHODE DE SIMULATION A ETE APPLIQUEE DE FACON ORIGINALE A L'ETUDE DES CIRCUITS DE COMMUTATION SOUMIS A DES COMMANDES VARIABLES. UNE PHASE DE VALIDATION MONTRE D'UNE PART LA COHERENCE DE LA METHODE UTILISEE ET D'AUTRE PART, UNE BONNE COMPARAISON ENTRE RESULTATS SIMULES ET EXPERIMENTAUX. POUR LES CIRCUITS DE COMMUTATION, LES TEMPS DE SIMULATION IMPLIQUES SONT CONSIDERABLEMENT REDUITS PAR RAPPORT A LA METHODE IMPLICITE DE SIMULATION, QUI CONSISTE A RESOUDRE L'ENSEMBLE DES EQUATIONS ELECTRIQUES ET THERMIQUES DANS LE SIMULATEUR ELECTRIQUE SEUL.

Download or read book Contribution l analyse des probl mes de compatibilit lectromagn tique dans les circuits de l lectronique de puissance written by Michel Bareille and published by . This book was released on 2001 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: La mise en œuvre de nouvelles réglementations européennes en 1996 a révélé un besoin important en méthodes de conception de circuits prenant en compte les phénomènes de pollution électromagnétique. Dans le domaine de l'Electronique de Puissance, ce constat s'accompagne de la nécessité de disposer de modèles spécifiques d'interrupteurs capables de décrire les phénomènes observés lors des commutations. Les travaux présentés dans ce mémoire concernent la mise en œuvre et l'implantation dans le logiciel SABER de modèles physiques distribués de composants de puissance (I.G.B.T., diode) en vue de la simulation de convertisseurs pour la Compatibilité Electromagnétique (C.E.M.). Ces modèles, développés initialement au L.A.A.S. par l'équipe du Professeur LETURCQ, ont tout d'abord été validés sur des circuits classiques de l'Electronique de Puissance (hacheur série, gate charge) en situation normale puis extrême de fonctionnement (I.G.B.T. en court-circuit). Deux exemples d'apports de ces modèles pour la C.E.M. ont ensuite été étudiés : influence du recouvrement inverse de la diode sur le spectre du courant dans le hacheur série simulation de la Méthode de Commande à Dérivées Continues pour le gradateur à commande symétrique. Les résultats obtenus sont en accord avec ceux disponibles dans la littérature et valident l'utilisation de ces modèles pour la simulation C.E.M. de convertisseurs dans SABER. L'I.G.B.T. et la diode ont alors été couplés à des modèles équivalents de composants passifs, de commande et d'interconnexion pour simuler de façon globale le comportement d'un convertisseur: le hacheur série sur charge inductive. Les formes d'ondes obtenues ont permis de rendre compte du fonctionnement réel du circuit à la fois à l'échelle macroscopique et à l'échelle des commutations. Cette approche devrait aboutir à un véritable prototypage virtuel permettant la prévision des perturbations émises ou reçues par un circuit de puissance, et ce dès sa conception.

Download or read book PRISE EN COMPTE DU CABLAGE DANS LA CONCEPTION ET LA SIMULATION DES CONVERTISSEURS DE PUISSANCE written by WIM.. TEULINGS and published by . This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: UN DES DEFIS DE L'ELECTRONIQUE DE PUISSANCE MODERNE EST LA COMPATIBILITE ELECTROMAGNETIQUE (CEM). DEVANT L'ACCROISSEMENT DE LA RAPIDITE DE COMMUTATION, LE CABLAGE DEVIENT UN COMPOSANT A PART ENTIERE. IL DOIT DONC ETRE MODELISE. L'OBJECTIF DE CE TRAVAIL EST DE MONTRER QU'IL EST POSSIBLE A L'HEURE ACTUELLE DE SIMULER ENTIEREMENT UN CONVERTISSEUR MODERNE, EN TENANT COMPTE DES IMPERFECTIONS DUES AU CABLAGE (SIMULATION FINE). LES FORMES D'ONDES EN COMMUTATION OBTENUES SONT SUFFISAMMENT PRECISES POUR PREDIRE LES PERFORMANCES VIS-A-VIS LA CEM. CEPENDANT, CE TYPE DE SIMULATION EST RELATIVEMENT LONG, ET CETTE APPROCHE DOIT ETRE RESERVEE A LA VERIFICATION DE L'IMPLANTATION TECHNOLOGIQUE FINALE. ELLE NE PEUT SERVIR D'AIDE AU CONCEPTEUR. C'EST POURQUOI DES MODELES ANALYTIQUES PLUS SIMPLES SONT DEVELOPPES A PARTIR DE L'ANALYSE DES RESULTATS DE SIMULATION FINE. CES MODELES, D'UNE BONNE PRECISION, FONT INTERVENIR DES PARAMETRES TECHNOLOGIQUES, ET PEUVENT SERVIR D'AIDE A LA CONCEPTION. LES DEUX APPROCHES ONT ETE APPLIQUEES A UN CONVERTISSEUR REALISE SUR CIRCUIT IMPRIME ET EN TECHNOLOGIE SUBSTRAT METALLIQUE ISOLE (SMI).

Download or read book Prise en compte du cablage dans la conception et la simulation des convertisseurs de puissance written by Wim Teulings and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un des défis de l'Electronique de Puissance moderne est la Compatibilité Electromagnétique (CEM). Devant l'accroissement de la rapidité de commutation, le câblage devient un composant à part entière. Il doit donc être modélisé. L'objectif de ce travail est de montrer qu'il est possible à l'heure actuelle de simuler entièrement un convertisseur moderne, en tenant compte des imperfections dues au câblage (simulation fine). Les formes d'ondes en commutation obtenues sont suffisamment précises pour prédire les performances vis-à-vis de la CEM. Cependant, ce type de simulation est relativement long, et cette approche doit être réservée à la vérification de l'implantation technologique [male. Elle ne peut servir d'aide au concepteur. C'est pourquoi des modèles analytiques plus simples sont développés à partir de l'analyse des résultats de simulation fine. Ces modèles, d'une bonne précision, font intervenir des paramètres technologiques, et peuvent servir d'aide à la conception. Les deux approches ont été appliquées à un convertisseur réalisé sur Circuit Imprimé et en technologie Substrat Métallique Isolé (SMI). L'influence d'une capacité de découplage sur le niveau des perturbations conduites a également été examinée dans les deux cas.

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.

Download or read book Multifunctional Oxide Heterostructures written by Evgeny Y. Tsymbal and published by OUP Oxford. This book was released on 2012-08-30 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the rapidly developing field of oxide thin-films and heterostructures. Oxide materials combined with atomic-scale precision in a heterostructure exhibit an abundance of macroscopic physical properties involving the strong coupling between the electronic, spin, and structural degrees of freedom, and the interplay between magnetism, ferroelectricity, and conductivity. Recent advances in thin-film deposition and characterization techniques made possible the experimental realization of such oxide heterostructures, promising novel functionalities and device concepts. The book consists of chapters on some of the key innovations in the field over recent years, including strongly correlated oxide heterostructures, magnetoelectric coupling and multiferroic materials, thermoelectric phenomena, and two-dimensional electron gases at oxide interfaces. The book covers the core principles, describes experimental approaches to fabricate and characterize oxide heterostructures, demonstrates new functional properties of these materials, and provides an overview of novel applications.

Download or read book III Nitride Semiconductors written by M.O. Manasreh and published by Elsevier. This book was released on 2000-12-06 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research advances in III-nitride semiconductor materials and device have led to an exponential increase in activity directed towards electronic and optoelectronic applications. There is also great scientific interest in this class of materials because they appear to form the first semiconductor system in which extended defects do not severely affect the optical properties of devices. The volume consists of chapters written by a number of leading researchers in nitride materials and device technology with the emphasis on the dopants incorporations, impurities identifications, defects engineering, defects characterization, ion implantation, irradiation-induced defects, residual stress, structural defects and phonon confinement. This unique volume provides a comprehensive review and introduction of defects and structural properties of GaN and related compounds for newcomers to the field and stimulus to further advances for experienced researchers. Given the current level of interest and research activity directed towards nitride materials and devices, the publication of the volume is particularly timely. Early pioneering work by Pankove and co-workers in the 1970s yielded a metal-insulator-semiconductor GaN light-emitting diode (LED), but the difficulty of producing p-type GaN precluded much further effort. The current level of activity in nitride semiconductors was inspired largely by the results of Akasaki and co-workers and of Nakamura and co-workers in the late 1980s and early 1990s in the development of p-type doping in GaN and the demonstration of nitride-based LEDs at visible wavelengths. These advances were followed by the successful fabrication and commercialization of nitride blue laser diodes by Nakamura et al at Nichia. The chapters contained in this volume constitutes a mere sampling of the broad range of research on nitride semiconductor materials and defect issues currently being pursued in academic, government, and industrial laboratories worldwide.

Download or read book Radio Spectrum Management written by Haim Mazar (Madjar) and published by John Wiley & Sons. This book was released on 2016-08-29 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamentals of wireless communications and services, explaining in detail what RF spectrum management is, why it is important, which are the authorities regulating the use of spectrum, and how is it managed and enforced at the international, regional and national levels. The book offers insights to the engineering, regulatory, economic, legal, management policy-making aspects involved. Real-world case studies are presented to depict the various approaches in different countries, and valuable lessons are drawn. The topics are addressed by engineers, advocates and economists employed by national and international spectrum regulators. The book is a tool that will allow the international regional and national regulators to better manage the RF spectrum, and will help operators and suppliers of wireless communications to better understand their regulators.

Download or read book Formal Methods Applied to Complex Systems written by Jean-Louis Boulanger and published by John Wiley & Sons. This book was released on 2014-07-22 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents real-world examples of formal techniques in an industrial context. It covers formal methods such as SCADE and/or the B Method, in various fields such as railways, aeronautics, and the automotive industry. The purpose of this book is to present a summary of experience on the use of “formal methods” (based on formal techniques such as proof, abstract interpretation and model-checking) in industrial examples of complex systems, based on the experience of people currently involved in the creation and assessment of safety critical system software. The involvement of people from within the industry allows the authors to avoid the usual confidentiality problems which can arise and thus enables them to supply new useful information (photos, architecture plans, real examples, etc.).

Download or read book La traduction de l anglais au fran ais written by Michel Ballard and published by . This book was released on 2005 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: S'adressant à ceux qui souhaitent s'initier et s'entraîner, de manière raisonnée, à la pratique de la traduction, cet ouvrage offre une méthode d'analyse originale et efficace. La pratique observée est sans cesse présente sous forme d'exemples abondants et variés, les principes dégagés sont illustrés par des exercices. La démarche utilise les différents apports des sciences du langage en les subordonnant à la spécificité de l'acte de traduire. Les termes techniques sont chaque fois clairement définis. L'ordre suivi va du signe à l'énoncé, sans jamais perdre de vue les éléments constituants d'un ensemble qui est le texte. L'ouvrage représente un ensemble cohérent disposé avec ordre mais dont les éléments modulaires sont utilisables séparément, un système de renvois multiples permettant de mettre en perspective les chapitres.

Download or read book Handbook written by and published by . This book was released on 2005 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Human Rights written by Jawahar Lal Kaul and published by Daya Books. This book was released on 1995 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Commemoration volume for Ramesh Chandra, D. Phil., founder dean, Faculty of Law, Maharshi Dayanand University, Rohtak; comprises contributed research papers, chiefly in the Indian context.

Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.

Download or read book Nuclear Power Plant Control and Instrumentation 1982 written by International Atomic Energy Agency and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: