Design of a switch-mode power supply with soft switching and analog control

International audienceIn high-power applications to meet high-efficiency and green standards. Some power-supply designers have found it easier to use a D/DC, full-bridge converter. This is because this kind of converter can obtain zero-voltage switching on the primary side of the converter reducing switching losses, and EMI and increasing overall efficiency. The purpose of this paper is the design of a switch mode power supply for industrial applications (vehicle battery charger, power supply for a helicopter…,). This Full Bridge DC/DC converter controlled by an analog control. This shows several advantages as simple implementation, compactness with satisfactory performance. The simulation results obtained are compared with a Full Bridge Converter controlled by UCC28950 which is a digital Texas Instruments component. The designed power supply operates with an efficiency of more than 90%

Electrical and thermal modeling and aging study of a C2M0025120D silicon carbide-based power MOSFET transistor

International audienceIn most papers studies about MOSFETs aging are treated from a materiel point of view, in this paper we consider the electrical aspects that contribute to such degradation. Two important degradation mechanisms are proposed related to the transistor bias and the increase of its temperature. This study consists to push the studied transistor to operate in an aging mode by imposing particular bias conditions and excessive junction temperature. Based on some electrical quantities, such as drain leakage current and on the junction temperature, the behavior of the transistor is deduced when operating in aging mode. The simulation results obtained show that during these particular operations, the junction temperature increases, which may destroy the transistor

Towards a Smart Grid Communication

AbstractSmart grids are one of the technological answers to the ‘3 x 20’ objective of the 2020 climate and energy package of the European Union: 20% renewable energies, saving energy and reducing emissions green house gas. The effective insertion of the production of renewables of intermittent nature (wind and) photovoltaic) and new uses of electricity (heat pumps, electric vehicles...) in the electric system requires the design of equipment “smart’, thanks to the new technologies of information and communication. [1,2, 5)].A major challenge is to be able to use five key technology area :Integrated Communications, sensing and measuring,advanced components, advanced control methods, improved Interfaces and decision support in an industrial context demanding in terms of quality, safety, security and cost.This paves the way for researchers to propose relevant and sustainable solutions.This paper tries to focuss on the importance of Information and Communication Technology (ICT), which ensures a two way communications with a collection of secure and reliable data from sensors and meters located throughout the grid and transmitted directly to the grid operator's control room

Electrical Loads of a Smart House and Consumption Analyses

International audienceThis paper considers the modeling energy consumption of a house with as objective the dimensioning and optimization of renewable energy sources and the energy saving. For the heating needs a house with rooms is modeled and simulated in Matlab/simulink to predict the needed power. The thermal characteristic and model parameters are deduced for the architectural studies and design using architects softwares. We assume that to people live in this house of í µí±š 2. Despite the question seems classical, for going toward zero energy buildings, it has never been considered scientifically to define a complete set of models and simulations. In this work, we measured the consumption of each one of the house loads to be able to have a corresponding models

Design of F-16 Airfoil Mock-ups for Supersonic Wind Tunnel: Study, Production, Testing and Validation

This research paper presents a comprehensive investigation into the behavior of viscous supersonic laminar flow and the Shock Wave- Laminar Boundary Layer Interaction (SWBLI) around the F-16 laminar NACA 6-series airfoil NACA 64A204. The study aims to establish and compare different methods for accurately describing these complex phenomena, which are of significant importance in the development of advanced aerospace technologies. To achieve this objective, a unique approach was adopted, involving the design and production of a mock-up F-16 airfoil equipped with pressure taps for use in the supersonic burst wind tunnel AF300. The mock-up was then experimentally tested, and the obtained data were analysed using numerical simulations with Ansys Fluent and a theoretical model based on a previously established analytical SWBLI model. The results obtained from the experimental, numerical, and analytical analyses validate the designed NACA 64A204 mock-up to a great extent. The study provides valuable insights into the physics of viscous supersonic laminar flow and SWBLI, contributing to a better understanding of these phenomena. The findings of this study will have important applications in the design of high-speed aircraft and other advanced aerospace technologies.Comment: 14 pages, 17 figures, 5 tables, submitted to Jounral of Applied Fluid Mechanic

The Coastal Data Information Program, a Successful Federal, State and University Cooperation

International audienceThermal management and heat prediction are essential to improve the Li-ion battery operation life and performance, especially in Energy Storage System (ESS) for electric vehicles. Variation of cells temperatures of a battery pack can cause damage if not managed. In this paper, an electrochemical-thermal battery pack of three parallel-connected cylindrical Li-ion cells is modelled using COMSOL Multi-physics. The battery pack is cooled using air cooling approach with different inlet velocity to investigate its impact on the model temperature evolution , and the developed thermal model was then, charged/discharge at different temperatures to generate the essential data needed to model an electric-thermal model and identify its parameters in Matlab/Simulink software

Electro-thermal Model of a Silicon Carbide Power MOSFET

International audienceThis paper proposes an electro thermal model for power silicon carbide (SiC) MOSFET based on the EKV MOSFET structure. The thermal dissipation is modeled as an RC Network. The model is developed for the SiC MOSFET CMD CREE (V, A) and integrated in the Psim, Saber and Pspice simulation software libraries for prototyping. The simulation curves are compared with the manufacturers' data-sheet

Représentation d'état pour un MOSFET SiC

International audienceThis paper proposes a State Space Model for a power a Silicon Carbide (SiC) MOSFET. The model uses the electrical EKV MOSFET structure. The model is developed for the SiC MOSFET CMD CREE (V, A) and uses the parameters extracted from datashee

The Application of Genetic Risk Scores in Rheumatic Diseases: A Perspective

\ua9 2023 by the authors.Modest effect sizes have limited the clinical applicability of genetic associations with rheumatic diseases. Genetic risk scores (GRSs) have emerged as a promising solution to translate genetics into useful tools. In this review, we provide an overview of the recent literature on GRSs in rheumatic diseases. We describe six categories for which GRSs are used: (a) disease (outcome) prediction, (b) genetic commonalities between diseases, (c) disease differentiation, (d) interplay between genetics and environmental factors, (e) heritability and transferability, and (f) detecting causal relationships between traits. In our review of the literature, we identified current lacunas and opportunities for future work. First, the shortage of non-European genetic data restricts the application of many GRSs to European populations. Next, many GRSs are tested in settings enriched for cases that limit the transferability to real life. If intended for clinical application, GRSs are ideally tested in the relevant setting. Finally, there is much to elucidate regarding the co-occurrence of clinical traits to identify shared causal paths and elucidate relationships between the diseases. GRSs are useful instruments for this. Overall, the ever-continuing research on GRSs gives a hopeful outlook into the future of GRSs and indicates significant progress in their potential applications