Download or read book Contribution l tude des convertisseurs direct de fr quence transistors de puissance written by Arnaldo Perin and published by . This book was released on 1984 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude des convertisseurs directs de fr quence transistors de puissance written by Arnaldo Perin and published by . This book was released on 1984 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conception et réalisation d'un nouveau type de convertisseur direct de fréquence, alimenté directement par un alternateur à vitesse variable, assimilé à une source de courant. Le convertisseur doit fournir, après filtrage, une tension d'amplitude et de fréquence fixes. La modulation utilisée est le résultat d'une optimisation des largeurs d'impulsions permettant de régler l'amplitude et la fréquence du courant de sortie du convertisseur, tout en minimisant les harmoniques de rang bas qui sont difficiles à filtrer. Dans la maquette une commande numérique impose un motif de commutation préalablement optimisé. Problèmes concernant la commutation des interrupteurs bidirectionnels nécessaires à ce type de convertisseur
Download or read book Contribution l tude des convertisseurs continu continu en alternatif transistors written by Henri Cammas and published by . This book was released on 1974 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CONTRIBUTION A L ETUDE ET A LA MISE EN UVRE DE STRUCTURES DE CONVERTISSEURS CONTINU CONTINU A FREQUENCE ELEVEE written by ANANI SYLVAIN.. D'ALMEIDA and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA TENDANCE DE CES DERNIERES ANNEES A ETE D'AUGMENTER DE MANIERE DRASTIQUE LA FREQUENCE DE DECOUPAGE DANS LES ALIMENTATIONS CONTINU-CONTINU, AFIN D'AUGMENTER LA PUISSANCE VOLUMIQUE ET LA FIABILITE. POUR CELA, IL A FALLU TROUVER DES TECHNIQUES QUI PERMETTENT DE MAITRISER LES PERTES A LA COMMUTATION DANS LES SEMI-CONDUCTEURS DE PUISSANCE. LA RESONANCE EST MAINTENANT UNE SOLUTION QUI PERMET D'ATTEINDRE CE BUT TOUT EN REDUISANT LES PERBATIONS ELECTROMAGNETIQUES DES CONVERTISSEURS STATIQUES. L'OBJECTIF DE CE DOCUMENT EST DE COMPARER QUELQUES MODES DE RESONANCE (QUASI-RESONANCE EN COURANT OU EN TENSION ET MULTI-RESONANCE EN TENSION) EN MONTRANT LEURS AVANTAGES, LEURS INCONVENIENTS ET LEURS LIMITES. NOUS PRESENTERONS ENSUITE LES RESULTATS THEORIQUES ET EXPERIMENTAUX SUR UN CONVERTISSEUR MULTI-RESONANT EN TENSION D'UNE CENTAINE DE WATTS DEVELOPPE POUR FRANCE-TELECOM
Download or read book Contribution l tude des transistors MOS written by Mario Zamorano (auteur d'une thèse de sciences.) and published by . This book was released on 1977 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: MISE AU POINT DES TECHNOLOGIES DE CONCEPTION ADAPTEES A LA REALISATION DE STRUCTURES A DOUBLE GRILLE UTILISABLES DANS LE DOMAINE U.H.F. ETABLISSEMENT DES MODELES MATHEMATIQUES ET SCHEMAS EQUIVALENTS DE CES STRUCTURES A PARTIR DES PHENOMENES PHYSIQUES DONT ELLE EST LE SIEGE, DEFINITION DES TECHNIQUES DE DETERMINATION DES PARAMETRES DE CES MODELES POUR DES MESURES ADAPTEES ET PROPOSITION SUR LA BASE DE CRITERES DEFINIS, DE QUELQUES METHODES D'EVALUATIONS DE PERFORMANCES PLUS SPECIFIQUES. LES 2 TYPES DE TRANSISTORS ETUDIES DANS LA 1ERE PARTIE SONT DES TETRODES SUR SILICIUM MASSIF ET SUR SILICIUM SUR ISOLANT. DANS LA 2EME PARTIE ON APPORTE UNE CONTRIBUTION A L'ANALYSE DES MECANISMES QUI REGISSENT LE FONCTIONNEMENT DU TRANSISTOR DE PUISSANCE A CANAL VERTICAL, ET ON MET EN EVIDENCE SES PROPRIETES ACTUELLES POUR L'AMPLIFICATION HAUTE FREQUENCE.
Download or read book tude et r alisation d un convertisseur modulation de largeur d impulsions transistors aliment en haute tension continue written by Diallo Almadidi and published by . This book was released on 1983 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse porte sur l'étude et la réalisation d'un convertisseur de puissance à transistors piloté par un circuit de commande entièrement digital. Cette technique numérique permet entre autres de générer une onde MLI (Modulation en Largeur Impulsions) ayant une amplitude et une fréquence variable et indépendante. Le convertisseur (onduleur) est alimenté par une tension continue adaptée de valeur moyenne 400 V découpée à 20 kHz. En vue d'améliorer le rendement d'un tel système, un module hacheur de 4,5 kW utilisant une nouvelle technique de protection des transistors bipolaires a été conçu et réalisé. L'utilisation de tels modules permet de maintenir un rendement élevé des systèmes convertisseurs travaillant en haute tension même au dixième de la puissance nominale.
Download or read book Contribution l tude de la stabilit de cascade de convertisseurs written by Serge Pierfederici and published by . This book was released on 1998 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce mémoire traite du problème de la mise en cascade de convertisseurs en vue d'une application à la correction du facteur de puissance sur le réseau monophasé. Après avoir évoqué les différentes techniques utilisées dans la correction du facteur de puissance, deux approches vont être traitées. La première utilise les propriétés de la théorie des systèmes à structure variable pour générer la commande large signal d'une cascade boost-forward. La robustesse, un contrôle à fréquence fixe et un facteur de puissance quasi unitaire sont les principales caractéristiques de cette commande. La seconde utilise un développement limité au premier ordre, autour du point d'équilibre pour générer les commandes découplées de chaque étage d'une cascade de convertisseur. Cette méthode permet un parfait contrôle des grandeurs internes du système lors des divers régimes transitoires. Dans le cas d'une cascade boost-forward, l'interaction entre les deux techniques précédentes permet de cumuler leurs avantages respectifs. Des méthodes ont été proposées afin d'estimer les domaines de validité des commandes utilisées. Pour l'approche large signal et la commande par mode de glissement, l'étude du comportement du système au voisinage des surfaces de commutation permet de déterminer les domaines de l'espace d'état ou la stabilité au sens large signal est assurée. Pour l'approche petit signal, deux méthodes, applicables aux convertisseurs statiques et permettant d'estimer les domaines d'attraction stable autour d'un point de fonctionnement, ont été présentées.
Download or read book Contribution l tude et la mise en oeuvre de strucutres de convertisseurs continu continu fr quence lev e written by Anani Sylvain d'. Almeida and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: La tendance de ces dernières années a été d'augmenter de manière drastique le fréquence de découpage dans les alimentations continu-continu, afin d'augmenter la puissance volumique et la fiabilité. Pour cela, il a fallu trouver des techniques qui permettent de maitriser les pertes à la commutaiton dans les semi-conducteurs de puissance. La résonance est maintenant une solution qui permet d'atteindre ce but tout en réduisant les perturbations électromagnétiques des convertisseurs statiques. L'objectif de ce document est de comparer quelques modes de résonance (quasi-résonance en courant ou en tension et multi-résonance en tension) en montrant leurs avantages, leurs inconvénients et leurs limites. Nous présenterons ensuite les résultats théoriques et expérimentaux sur un convertisseur multi-résonant en tension d'une centaine de watts déeloppé pour France-Télécom.
Download or read book Contribution l tude de la modulation de fr quence d oscillateurs transistor written by Michel Roumeguère and published by . This book was released on 1962 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soft Commutation written by Y. Cheron and published by Springer Science & Business Media. This book was released on 1992-05-31 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author gives a thorough explanation of soft commutation making use of the concept of duality to explain the principles of the technique and to place it in context in the field of power electronics.
Download or read book Power Electronics Semiconductor Devices written by Robert Perret and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book relates the recent developments in several key electrical engineering R&D labs, concentrating on power electronics switches and their use. The first sections deal with key power electronics technologies, MOSFETs and IGBTs, including series and parallel associations. The next section examines silicon carbide and its potentiality for power electronics applications and its present limitations. Then, a dedicated section presents the capacitors, key passive components in power electronics, followed by a modeling method allowing the stray inductances computation, necessary for the precise simulation of switching waveforms. Thermal behavior associated with power switches follows, and the last part proposes some interesting prospectives associated to Power Electronics integration.
Download or read book Continuous Time Sigma Delta A D Conversion written by Friedel Gerfers and published by Springer Science & Business Media. This book was released on 2006-02-27 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sigma-delta A/D converters are a key building block in wireless and multimedia applications. This comprehensive book deals with all relevant aspects arising during the analysis, design and simulation of the now widespread continuous-time implementations of sigma-delta modulators. The results of several years of research by the authors in the field of CT sigma-delta modulators are covered, including the analysis and modeling of different CT modulator architectures, CT/DT loop filter synthesis, a detailed error analysis of all components, and possible compensation/correction schemes for the non-ideal behavior in CT sigma-delta modulators. Guidance for obtaining low-power consumption and several practical implementations are also presented. It is shown that all the proposed new theories, architectures and possible correction techniques have been confirmed by measurements on discrete or integrated circuits. Quantitative results are also provided, thus enabling prediction of the resulting accuracy.
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 UCRL written by U.S. Atomic Energy Commission and published by . This book was released on 19?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Language Interpretation and Communication written by D. Gerver and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Language Interpretation and Communication: a NATO Symposium, was a multi-disciplinary meeting held from September 26 to October 1st 1977 at the Giorgio Cini Foundation on the Isle of San Giorgio Maggiore in Venice. The Symposium explored both applied and theoretical aspects of conference interpre tation and of sign language interpretation. The Symposium was sponsored by the Scientific Affairs Division of the North Atlantic Treaty Organisation, and we would like to express our thanks to Dr. B. A. Bayrakter of the Scientific Affairs Division and to the Members of the NATO Special Programme Panel on Human Factors for their support. We would also like to thank Dr. F. Benvenutti and his colleagues at the University of Venice for their generous provision of facilities and hospitality for the opening session of the Symposium. Our thanks are also due to Dr. Ernesto Talentino and his colleagues at the Giorgio Cini Foundation who provided such excellent conference facilities and thus helped ensure the success of the meeting. Finally, we would like to express our appreciation and thanks to Becky Graham and Carol Blair for their invaluable contributions to the organization of the Symposium, to Ida Stevenson who prepared these proceedings for publication, and to Donald I. MacLeod who assisted with the final preparation of the manuscript.
