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

Simulated 1200V SiC-MOSFET short-circuit behavior

International audienc

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

International audienc

Measurements and modeling of laser-induced incandescence of soot at different heights in a flat premixed flame

Laser-induced incandescence (LII) measurements were conducted in a laminar flat rich premixed CH4/ O2/N2 flame at atmospheric pressure using a Nd:YAG laser operated at 1,064 nm. Time-resolved LII signals were measured at 610 nm (20 nm FWHM) at different heights above the burner exit surface and at different laser fluences. The averaged soot temperature over 10 ns around the laser peak was determined from spectrally resolved LII signals over the spectral range of 500\u2013630 nm. Flame temperature and soot primary particle diameter and aggregate size at several flame heights were obtained using the NO-LIF thermometry and from image analyses of sampled soot. The time-resolved LII signal and the averaged soot temperature were modeled using two LII models. To achieve reasonable agreement between the modeled and experimental LII signal and soot temperature at low laser fluences, it is necessary to use flame height-dependent soot absorption functions. Such practice can be attributed to the continuous variation of soot thermal and/or radiative properties during the surface growth process after inception. At high laser fluences, both LII models are unable to reproduce the overall shape of the normalized time-resolved LII signal profiles and the averaged soot temperatures.Peer reviewed: YesNRC publication: Ye

BJT static behavior improvement by modification of the epitaxial layer

International audienceIn this paper, high voltage Bipolar Junction Transistors are presented and compared in order to suggest a bidirectional switch for household appliances with fully turn-on, turn-off control. A comparative theoretical study, using 2D simulations, shows that concepts like "superjunctions" and "floating islands" improve the static current gain without unwanted behavior like parasitic diodes

An Innovative Solar Production Simulator to Better Teach the Foundations of Photovoltaic Energy to Students

International audienceThis paper deals with a new approach to science and education regarding photovoltaic energy and applications. This teaching method is based on a Solar Production Simulator (SPS). This apparatus is able to reproduce the sun’s path on a small scale at all times of the year. The energy production is then estimated with different orientation and/or inclination of a solar sensor. The SPS provides students with the unique opportunity to learn, in a playful manner, the fundamental principles of photovoltaic energy. Several examples of practical work are detailed to give an accurate appreciation of many applications in the photovoltaic sector. A lot of applications could be studied such as implementation of solar position calculations, electrical characterization of solar cells with various technologies or tracking system programming