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CONCEPTION DE CONVERTISSEURS ALTERNATIF - CONTINU MONO-ETAGE A ABSORPTION SINUSOÏDALE

Abstract : Recently, power factor correction has been introduced into power converters to replace the passive filters at the front-end of converters and to respect new standards corne into opération. Single-stage power factor correction has been succeeded to the classicaJ two-stage power factor correction which présents a high volume and cost. This thesis essentially consists of two types of applications. Low power isolated single-stage AC/DC conversion from 230 V rms. AC voltage to 54 V DC. The power is fixed at 300 W. Due to their cost and volume, asymmetrical structures Flyback and Sepic are more adapted. From this study, it émerges also that series-resonant converter operating in discontinuous conduction mode could be respond to desired spécifications if components stresses are acceptable. The second part deals with the isolated single-stage AC/DC conversion for médium power (3 kW) applications with 150 V as output voltage. For this kind of applications, only current-driven and voltage-driven résonant converters are susceptible to respond to the spécifications. An approach to design current-driven résonant converter is presented. Also, several résonant circuits are examined to discuss power factor correction capabilities of voltage-driven résonant converters. By evaluating advantages and disadvantages of thèse converters, two of them are chosen, and realised prototypes présent a high power factor and respect the European standards EN 61000-3-2.
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Hassan Benqassmi. CONCEPTION DE CONVERTISSEURS ALTERNATIF - CONTINU MONO-ETAGE A ABSORPTION SINUSOÏDALE. Energie électrique. Institut National Polytechnique de Grenoble - INPG, 1998. Français. ⟨tel-00819323⟩

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