Gummel-Poon modeling of a New Super-Gain BJT and an innovative 600V AC switch

International audienceThis paper deals with the static electrical modeling of the super-gain BJT and the innovative 600V AC switch solution which it gives to. As power bipolar component, their modeling is based on the Gummel-Poon model which is widely accepted and used by researchers as well as circuit simulators like Pspice. All of the model parameters are extracted from device characterization data via extraction mathematical equations. The modeling of the super-gain BJT is mainly composed of two separate parts which is respectively the forward-biased modeling and the reverse-biased modeling. The characterization test bench is presented, than the extraction methods of respective parameter category are also introduced in this paper as well as the data processing method. The validation of the extracted model parameters will be done by comparing the SPICE simulation results with experimental ones under the same condition. The comparison result proves a good coherence between simulations and experimentations

BJT application expansion by insertion of superjunction

International audienceIn this paper, some high voltage Bipolar Junction Transistors are presented and compared in order to suggest a switch for household appliances with fully turn-on, turn-off control. For the first time, a comparative theoretical study, using 2D simulations, shows that concepts like the "superjunction" improve the static behaviour of conventional BJT. These new structures are compared with a SJMOSFET and an IGBT. The new BJT exhibits lower static losses than SJMOSFET and gives up an interest in bipolar structure

Simulateur de Production Solaire : un outil pédagogique innovant dédié à l’enseignement des principes fondamentaux de l’énergie photovoltaïque

Cet article décrit une nouvelle approche pédagogique pour l’enseignement des connaissances de base de l'énergie solaire et des applications photovoltaïques. Cette méthode d'enseignement expérimentale et interactive permet aux étudiants et aux concepteurs de systèmes photovoltaïques de manipuler un simulateur de production solaire. Cet outil de simulation reproduit à échelle réduite la trajectoire du soleil quelle que soit la période de l’année. La production d'énergie est ensuite calculée pour différentes inclinaisons et orientations d'un capteur solaire. Le simulateur offre aux étudiants l'occasion d'acquérir d’une façon ludique les fondamentaux de l’énergie photovoltaïque. Plusieurs exemples de travaux pratiques sont détaillés afin de donner une vue d'ensemble des exercices d'apprentissage qui pourraient être faits par les étudiants pour découvrir les multiples applications du photovoltaïque. À titre d’exemple, de nombreux cas d’études peuvent être traités tels que la mise en oeuvre des calculs de position du soleil, la caractérisation électrique des cellules solaires avec différentes technologies ou encore la programmation de suiveurs du point de puissance maximale

Circuits équivalents pour transformateurs multienroulements : Application à la CEM conduite d'un convertisseur

The work presented in this report refers to the search of equivalent circuits with lumped constants to represent the electric behavior of the transformers. It falls under the continuity of a long study, started in 1988 and undertaken in collaboration with several industrialists. It generalizes former work and leads to the representation of the multiwinding transformers. General methods of representation and experimental identification of the multiwinding transformers are established. For that purpose, from the general reference marks concerning the number of measurable impedances, the number of poles and zeros of these impedances are disengaged. New concepts, such as the leakage transformer and progressive modeling, are introduced. An analytical model is developed to take into account for the effects of the induced currents (skin and proximity) in the conductors. A solution is proposed to solve the problem of the representation of these effects by lumped constants. AlI this is validated in experiment and, in margin of this work, a bench intended to characterize the magnetic radiation of the magnetic components is studied and tested successfully. The interest of preceding work is illustrated by the study of an indus trial converter. It proves that the imperfections of the transformer using three windings, (weIl represented by the equivalent circuit) very strongly influence the dimensioning of the other components and the disturbances of common mode of the converter. It is thus shown that a precise model of transformer is a key element to design a reliable power converter and in conformity with the standards of electromagnetic compatibility.Le travail présenté dans ce mémoire se rapporte à la recherche de circuits équivàlents à constantes localisées pour représenter le comportement électrique des transformateurs. Il s'inscrit dans la continuité d'une longue étude, commencée en 1988 et menée en collaboration avec plusieurs industriels. Il généralise les travaux antérieurs et mène à la représentation des transformateurs multi-enroulements. Les méthodes générales de représentation et d'identification expérimentale des transformateurs multienroulements sont établies. Pour y parvenir, des repères généraux concernant le nombre d'impédances mesurables, le nombre de pôles et de zéros de ces impédances sont dégagés. Des notions nouvelles, telles que le transformateur de fuite et la modélisation progressive, sont introduites. Un modèle analytique est développé pour rendre compte des effets des courants induits (peau et proximité) dans les conducteurs. La représentation de ces effets par des constantes localisées, impossible à priori puisqu'ils mènent à des impédances proportionnelles à la racine carrée de la fréquence, est résolue. Tout ceci est validé expérimentalement et, en marge de ce travail, un banc destiné à caractériser le rayonnement magnétique des composants magnétiques est étudié et testé avec succès. L'intérêt du travail précédent est illustré par l'étude d'une alimentation à découpage industrielle. Il s'avère que les imperfections du transformateur à trois enroulements exploité par cette alimentation, bien représentées par le circuit équivalent, influent très fortement sur le dimensionnement des autres composants ainsi que sur les perturbations de mode commun du montage. Il est ainsi démontré qu'un modèle précis de transformateur est un élément clé pour concevoir des alimentations à découpage fiables et conformes aux normes de compatibilité électromagnétique en vigueur

Simulated 1200V SiC-MOSFET short-circuit behavior

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Improvement of a bidirectional switch for electric network

International audienceIn this paper, we suggest a new behaviour for a bipolar bidirectional switch for network application. We use two high current gain bipolar power transistors, based on TBSBT, one to control the forward current, and the second one to short-circuit the complementary diode, thus, for the first time, significantly decrease its power dissipation. For that, we must improve the power transistor's reverse current gain

A Review on Selected Patents about Trends Regarding Silicon Monolithic Power AC Switches

International audienceThis article deals with the evolution regarding silicon monolithic power AC switches design through reviewing selected patents. Key criteria that are considered in this review are device structure topologies, performances related to application areas and manufacturability. Three main categories of monolithic AC switches are presented and selected patents of each of these categories are described and discussed. Possible future developments and trends are also explored

New Multilevel Mixed Topology Development to Improve Inverter Robustness for Domestic Photovoltaic Installations

International audienceMultilevel inverters are well used in grid connected domestic photovoltaic applications because of their ability to generate a very good quality of waveforms, reducing switching frequency, and their low voltage stress across the power devices. However, this kind of inverter has to be modified to both limit common-mode currents and improve the robustness of the system. This paper presents a new mixed 5-level inverter that meets these challenges. The operating principle of the converter is proposed. Several experimental measurements are described to validate this new concept. The output voltage and current and the THD of the output voltage are particularly discussed

Lifetime Prediction Modeling of Non-Insulated TO-220AB Packages with Lead-Based Solder Joints during Power Cycling

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Modeling of carrier lifetime based on Deep-Level Transient Spectroscopy for power PIN diodes

International audienceThe dynamic performances of PIN diodes are very difficult to predict with Technology Computer-Aided Design (TCAD) simulation tools, especially when the carrier lifetime is adjusted. The standard simulation model used in TCAD tools for carrier lifetime is based on Shockley-Read-Hall (SRH) recombination theory. This model is not sufficient as it considers the presence of only one deep energy level located at the material mid-gap. Used as a lifetime killer, Platinum doping introduces several deep energy levels facilitating the minority carrier recombination. Thus, a new approach based on trap physical description is performed using Deep Level Transient Spectroscopy (DLTS) measurement technique. This approach has significantly reduced the big mismatch observed between the PIN diode turn-off measurements and the standard simulation model results