MODELO DE CÁLCULO DE PERDAS POR COMUTAÇÃO E MÉTODO DE SELEÇÃO DE TECNOLOGIAS DE TRANSISTORES FET APLICADOS A CONVERSORES ESTÁTICOS-Edemar de Oliveira Prado- Dissertação (mestrado) – Universidade Federal de Santa Maria, Centro de Tecnologia, Programa de Pós-Graduação em Engenharia Elétrica, RS, 2020-BRASIL

 ABSTRACT

 SWITCHING LOSSES CALCULATION MODEL AND METHOD FOR SELECTING FET TRANSISTOR TECHNOLOGIES APPLIED TO STATIC CONVERTERS 

Author: Edemar de Oliveira Prado 

Advisor: José Renes Pinheiro 

This dissertation presents an analytical model to assist in the calculation of switching losses and a methodology for selecting MOSFETs that with breakdown voltages greater than 100 V. The model was developed based on physical and electrical concepts of the FET structure, considering non-linearities of Miller capacitance as a function of voltage variation, mainly present in MOSFETs manufactured to operate in voltages above 100 V. Simulation and experimental results that validate the model were obtained, considering the frequency range of 1 - 300 kHz, at which the limit of gate driver operation has been reached. The proposed model was compared to other loss calculation models frequently used in the literature, where it was observed that other models show an increase in the relative error for frequencies above 50 kHz. Heat transfer systems are analyzed and discussed. The proposed loss calculation model is used in the development of a comparative analysis between the technologies of conventional Silicon MOSFET, superjunction, SiC and GaN. The impact of stray capacitances, junction temperature, intrinsic resistances, switching frequency and power levels in each technology are analyzed. Application trend areas are defined for each technology based on yields as a efficiency of frequency and power.

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https://repositorio.ufsm.br/handle/1/22430

Research on the Optimal Design of Weinberg Converter Qian Chen*a, Peng Qiu*,Yi Lu*, Jinpei Du**, Jiayi Wu***, Haihong Yu*, IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING IEEJ Trans 2018

 

Research on the Optimal Design of Weinberg Converter 

AUTHORS:Qian Chen*a, Peng Qiu*, Yi Lu*, Jinpei Du**, Jiayi Wu***, Haihong Yu*,

Because of its advantages of continuous input and output currents, stable transfer function, and high efficiency, the Weinberg converter is used as battery discharge regulator. Its working principle under overlap and nonoverlap modes with stray parameters is analyzed. Then a design method is proposed to optimize the parameters. In order to estimate the heat distribution, the power loss is calculated according to the performance parameters, and then the efficiency trend is achieved toward the output current. In addition, the experimental results verify the optimal design using a 600W prototype. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 1. 

Introduction

 A power conditioning unit (PCU) is comprised of the main error amplifier (MEA), the shunt regulator (SR), the battery charge regulator (BCR), the battery discharge regulator (BDR), and telemetering/telecontrol (TM/TC) [1–5]. PCU balances the energy between each unit to keep the bus voltage constant so that the electrical equipment of satellites can obtain stable power from the main bus. When the satellites cannot get enough energy from the solar battery array in the shadow region or sunshine region, the batteries provide energy for the bus to keep bus voltage constant. BDR plays an important role during this process. Our aim is to study a highpower and high-efficiency boost converter that is easy to expand and realize current-sharing to achieve excellent bus performance. Efficiency, complexity, and linearity play an important role in choosing the topology of the BDR. The normal boost converter is not suitable for BDR because of its low efficiency, instability, and discontinuous output current. So far, the topologies that have been used in BDR are [6–8] phase-shift full bridge (PSFB), Superboost, Smart Add on, HE-Boost, and Weinberg.

VIEW FULL TEXT:https://onlinelibrary.wiley.com/doi/abs/10.1002/tee.22764

Analysis and Design of Multioutput Flyback Converter A study For A Lab Upgrade on the Flyback converter assignment at CHALMERS UNIVERSITY TECHNOLOGY Master's thesis in Electric Power Engineering Abdi Ahmed Abdullahi Kosar

 

Master's thesis 2016:ENM Analysis and Design of Multioutput Flyback Converter A study For A Lab Upgrade on the Flyback converter assignment at Chalmers Elteknik ABDI AHMED ABDULLAHI KOSAR Department of Energy & Environment Division of Electric Power Engineering Chalmers University of Technology Gothenburg, Sweden 2016

Abstract 

This thesis work is done in order to improve the existing lab in Chalmers for the study of Power Electronics. Assignments for the practical lab and computer simulation sessions of a yback converter have been reviewed and analysed. The analyses of the existing assignments shows that the circuit board used in the lab today is a multi purpose circuit and it is dicult to relate a equivalent circuit diagram of a yback converter. Furthermore, there is no relationship between the circuit and the simulation model. A simulation was done using PSpice and a prototype PCB board built with the aim of showing some of these interesting concepts in the course. The main suggestions are related to the simplication of the circuits so that immediate correlation can be made between the circuits being shown in the class and the PCB used in the lab. The simulation model can be used in the simulation session of the course. The new simulation model and the circuit board can demonstrate the role of the inductor in the yback transformer by varying its value. Another area of improvement would be on demonstrating of magnetics theory. There is no simulation or practical assignments about magnetics in the course today. Understanding the relation between the current ripple and magnetic ux is in the scope of the courses. It is also important to understand how high frequency aects the losses and the size of the core. Two transformers are designed in order to investigate these relationships. The result of the transformer design shows that a new assignment that can demonstrate how magnetic core behaves can be introduced.

VIEW FULL TEXT:https://odr.chalmers.se/handle/20.500.12380/252784