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LES PERTES DANS LES CONDENSATEURS BOBINES UTILISES EN ELECTRONIQUE DE PUISSANCE: MESURE CALORIMETRIQUE ET MODELISATION

Abstract : Losses in wound capacitors used in power electronic : calorimetric measurement and modelling The heating of capacitors used in power electronic, is a conséquence of the electrical losses, which are usualy represented by an Equivalent Séries Résistance ESR. The ratio P/Q (=tan5, dissipation factor), berween the dissipated power P and Oie reactive power Q, is so weak (10"1 to I0"2) thaï the measurement of ESR by classical means becoraes very difficult. An expérimental device based on calorimetry hâve been built in order to carry oui this measurement. It allows a characterizarion of very low-loss capacitors (tan5 < 5.10"4), such as wound PP capacitors. The capacitors can be tested under rated voltage, from IfcHz to 1MHz, while the test température is kept berween -50°C and +100°C. Various wound capacitors made with différent dielectric materials : PP. PC and PET hâve been characterized. Losses in the dielectric material and those in metalic parts of thé components hâve been separated. which allowed us to study the dissipation factor tanS of thèse polymers as a fonction of température, for few frequencies. According to thèse results, an équivalent circuit composed of R, L and C éléments, hâve been pioposed in order to modelize the ESR variations with frequency. This mode! bave been validatcd for non sinusoïdal voltages, such as those existing in power electronic, by comparison between a calorimetric measurement of the losses in capacitors, and their évaluation by simulation using the équivalent circuits.
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Submitted on : Friday, November 22, 2013 - 2:10:53 PM
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Bruno Seguin. LES PERTES DANS LES CONDENSATEURS BOBINES UTILISES EN ELECTRONIQUE DE PUISSANCE: MESURE CALORIMETRIQUE ET MODELISATION. Sciences de l'ingénieur [physics]. Institut National Polytechnique de Grenoble - INPG, 1997. Français. ⟨NNT : ⟩. ⟨tel-00908180⟩

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