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Dissertations / Theses on the topic 'Voltage level converter'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Thomas, Stephan [Verfasser]. "A Medium-Voltage Multi-Level DC/DC Converter with High Voltage Transformation Ratio / Stephan Thomas." Aachen : Shaker, 2014. http://d-nb.info/1049383176/34.

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2

Vadlmudi, Tripurasuparna. "A nano-CMOS based universal voltage level converter for multi-VDD SoCs." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3602/.

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Power dissipation of integrated circuits is the most demanding issue for very large scale integration (VLSI) design engineers, especially for portable and mobile applications. Use of multiple supply voltages systems, which employs level converter between two voltage islands is one of the most effective ways to reduce power consumption. In this thesis work, a unique level converter known as universal level converter (ULC), capable of four distinct level converting operations, is proposed. The schematic and layout of ULC are built and simulated using CADENCE. The ULC is characterized by performi

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3

Hawley, Joshua Christiaan. "Modeling and Simulation of a Cascaded Three-Level Converter-Based SSSC." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/10109.

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This thesis is dedicated to a comprehensive study of static series synchronous compensator (SSSC) systems utilizing cascaded-multilevel converters (CMCs). Among flexible AC transmission system (FACTS) controllers, the SSSC has shown feasibility in terms of cost-effectiveness in a wide range of problem-solving abilities from transmission to distribution levels. Referring to the literature reviews, the CMC with separated DC capacitors is clearly the most feasible topology for use as a power converter in the SSSC applications. The control for the CMC-Based SSSC is complicated. The design of the c

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4

Pan, Jianyu. "Control of Four-Level Hybrid Clamped Converter for Medium-Voltage Variable-Frequency Drives." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1562943204567575.

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5

Perera, Lasantha Bernard. "Multi Level Reinjection ac/dc Converters for HVDC." Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/1085.

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A new concept, the multi level voltage/current reinjection ac/dc conversion, is described in this thesis. Novel voltage and current source converter configurations, based on voltage and current reinjection concepts are proposed. These converter configurations are thoroughly analyzed in their ac and dc system sides. The fundamentals of the reinjection concept is discussed briefly, which lead to the derivation of the ideal reinjection waveform for complete harmonic cancellation and approximations for practical implementation. The concept of multi level voltage reinjection VSC is demonst

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6

Vadlamudi, Tripurasuparna Mohanty Saraju. "A nano-CMOS based universal voltage level converter for multi-V[subscript]DD SoCs." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3602.

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7

Schrock, Kenneth C. "A three-level buck converter to regulate a high-voltage DC-to-AC inverter." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46505.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.<br>Includes bibliographical references (leaves 94-95).<br>A three-level buck converter is designed and analyzed, and shown to be suitable as a high-voltage down converter as a pre-regulation stage for a 600 watt DC-to-AC power inverter. Topology selection for the inverter is examined, and a three-stage system is chosen to satisfy high voltage (1.1 kV), isolation, size, and efficiency requirements. Control of the buck converter is discussed in detail, including advanced features

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8

Efika, Ikenna Bruce. "A multi-level multi-modular flying capacitor voltage source converter for high power applications." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12154/.

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Two vital and dynamically changing issues are arising in the electric grid - an increase in electrical power demand, and subsequent reduction in power quality. Power electronics based solutions such as the Static Synchronous Compensator are increasingly deployed to mitigate power quality issues while High Voltage DC Transmission converters are currently installed to support the existing grid transmission capacity. Both applications require high power and high voltage power converters using switching devices with limited voltage ratings. The advent of Modular Multilevel Converters (MMC) is one

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9

Rankin, Paul Edward. "Modeling and Design of a SiC Zero Common-Mode Voltage Three-Level DC/DC Converter." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93176.

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As wide-bandgap devices continue to experience deeper penetration in commercial applications, there are still a number of factors which make the adoption of such technologies difficult. One of the most notable issues with the application of wide-bandgap technologies is meeting existing noise requirements and regulations. Due to the faster dv/dt and di/dt of SiC devices, more noise is generated in comparison to Si IGBTs. Therefore, in order to fully experience the benefits offered by this new technology, the noise must either be filtered or mitigated by other means. A survey of various DC

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10

Lee, Dong-Ho. "A Power Conditioning System for Superconductive Magnetic Energy Storage based on Multi-Level Voltage Source Converter." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/11042.

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A new power conditioning system (PCS) for superconductive magnetic energy storage (SMES) is developed and its prototype test system is built and tested. The PCS uses IGBTs for high-speed PWM operation and has a multi-level chopper-VSC structure. The prototype test system has three-level that can handle up to 250-kVA with a 1800-V DC link, a 200-A maximum load current , and a switching frequency reaching 20-kHz with the help of zero-current-transition (ZCT) soft-switching. This PCS has a great number of advantages over conventional ones in terms of size, speed, and cost. Conventional PCSs us

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11

Marzoughi, Alinaghi. "Investigating Impact of Emerging Medium-Voltage SiC MOSFETs on Medium-Voltage High-Power Applications." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/81822.

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For decades, the Silicon-based semiconductors have been the solution for power electronics applications. However, these semiconductors have approached their limits of operation in blocking voltage, working temperature and switching frequency. Due to material superiority, the relatively-new wide-bandgap semiconductors such as Silicon-Carbide (SiC) MOSFETs enable higher voltages, switching frequencies and operating temperatures when compared to Silicon technology, resulting in improved converter specifications. The current study tries to investigate the impact of emerging medium-voltage SiC MOSF

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12

Francisco, Venustiano Canales Abarca. "Novel DC/DC Converters For High-Power Distributed Power Systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28612.

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One of the requirements for the next generation of power supplies for distributed power systems (DPSs) is to achieve high power density with high efficiency. In the traditional front-end converter based on the two-stage approach for high-power three-phase DPSs, the DC-link voltage coming from the power factor correction (PFC) stage penalizes the second-stage DC/DC converter. This DC/DC converter not only has to meet the characteristics demanded by the load, but also must process energy with high efficiency, high reliability, high power density and low cost. To meet these requirements, approa

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13

Busquets, Monge Sergio. "A novel pulsewidth modulation for the comprehensive neutral-point voltage control in the three-level three-phase neutral-point-clamped dc-ac converte." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6372.

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Las topologías de convertidores multinivel han recibido una atención especial durante las dos últimas décadas debido a sus notables ventajas en aplicaciones de alta potencia y media/alta tensión. En estas topologías, y comparadas con el convertidor tradicional de dos niveles, el voltaje que soporta cada dispositivo semiconductor es menor, evitando los problemas asociados con la interconexión serie de dispositivos. La distorsión armónica en la tensión de salida es también menor y la eficiencia mayor. Pero incorporan un número superior de dispositivos semiconductores y la estrategia de modulació

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14

Lee, Moonhyun. "Digital-Based Zero-Current Switching (ZCS) Control Schemes for Three-Level Boost Power-Factor Correction (PFC) Converter." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99694.

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With the increasing demands on electronic loads (e.g. desktop, laptop, monitor, LED lighting and server) in modern technology-driven lives, performance of switched-mode power supply (SMPS) for electronics have been growing to prominence. As front-end converters in typical SMPS structure, ac-dc power-factor correction (PFC) circuits play a key role in regulations of input power factor, harmonics and dc output voltage, which has a decisive effect on entire power-supply performances. Universal ac-line and low-power system (90–264 Vrms, up to 300–400 W) is one of the most common power-supply speci

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15

Jiao, Yang. "High Power High Frequency 3-level NPC Power Conversion System." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56653.

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The high penetration of renewable energy and the emerging concept of micro-grid system raises challenges to the high power conversion techniques. Multilevel converter plays the key role in such applications and is studied in detail in the dissertation. The topologies and modulation techniques for multilevel converter are categorized at first by a thorough literature survey. The pros and cons for various multilevel topologies and modulation techniques are discussed. The 3-level neutral point clamped (NPC) topology is selected to build a 200kVA, 20 kHz power conversion system. The modularized ph

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16

Sedele, Serkan Paki. "A Novel Approach For Synthesising Sinus Waveforms At Power Level." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604723/index.pdf.

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In variable speed motor drive and uninterruptible power supply (UPS) applications, taditional method is to employ some kind of a modulation technique at a high frequency typically 6 kHz to 20 kHz range. In these modulation techniques, the switches are hard switched. The result is application of a series of pulses to the load, and if the load is inductive, sine wave current flows into the load. Hard and rapid switching causes a voltage waveform with a very high dv/dt (rate of change in voltage) causing high EMI problems, reduced life expectancy of the motor and additional losses. So a power sup

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17

Tan, Jiak-San. "Flexibility in MLVR-VSC back-to-back link." Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/1119.

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This thesis describes the flexible voltage control of a multi-level-voltage-reinjection voltage source converter. The main purposes are to achieve reactive power generation flexibility when applied for HVdc transmission systems, reduce dynamic voltage balancing for direct series connected switches and an improvement of high power converter efficiency and reliability. Waveform shapes and the impact on ac harmonics caused by the modulation process are studied in detail. A configuration is proposed embracing concepts of multi level, soft-switching and harmonic cancellation. For the configu

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18

Koganti, Naga Babu. "Modeling and Characterization of Circuit Level Transients in Wide Bandgap Devices." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo153311831687909.

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19

Boora, Arash Abbasalizadeh. "Flexible high-power multi DC-DC converters for train systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33208/1/Arash_Boora_Thesis.pdf.

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This thesis reports on the investigations, simulations and analyses of novel power electronics topologies and control strategies. The research is financed by an Australian Research Council (ARC) Linkage (07-09) grant. Therefore, in addition to developing original research and contributing to the available knowledge of power electronics, it also contributes to the design of a DC-DC converter for specific application to the auxiliary power supply in electric trains. Specifically, in this regard, it contributes to the design of a 7.5 kW DC-DC converter for the industrial partner (Schaffler and As

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20

Gebreel, Abd Almula G. M. "POWER CONVERSION FOR UHVDC TO UHVAC BASED ON USING MODULAR MULTILEVEL CONVERTER." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429358686.

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21

Jaksic, Marko Dragoljub. "Identification of small-signal dq impedances of power electronics converters via single-phase wide-bandwidth injection." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51222.

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AC and DC impedances of switching power converters are used for the stability analysis of modern power electronics systems at three-phase AC and single-phase DC interfaces. Therefore, a small-signal characterization algorithm for switching power converter, which is based on FFT, will be presented and explained. The presented extraction algorithm is general and can be used to obtain other small-signal transfer functions of arbitrary power converter switching simulation models. Furthermore, FFT algorithm is improved by using cross power spectral density functions for identification, resulting in

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22

Boutry, Arthur. "Theoretical and experimental evaluation of the Integrated gate-commutated thyristor (IGCT) as a switch for Modular Multi Level Converters (MMC)." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEI095.

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Une étude sur la réduction/suppression de l'inductance de limitation di/dt pour IGCTs et du clamp RCD en utilisant des diodes rapides en silicium (Si) et des diodes en carbure de silicium (SiC) dans les convertisseurs multiniveaux modulaires (MMC). Cette thèse contient :- Analyse des sous-modules de MMC HVDC existants.- Évaluation de l'intérêt des IGCTs dans les sous-modules MMC HVDC et comparaison des pertes avec les IGBT, en utilisant des facteurs de mérite spécifiques aux MMC créés dans cette thèse.- Test de double pulse avec diode à récupération rapide dans un module plastique pour tenter

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23

Kleist, Anders. "Theory of super power saving circuits and configurations for mixed signal CPU for smartcard application." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2326.

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<p>Designing an application specific integrated circuit (ASIC) must be starting with careful preparations, otherwise the chip will not be as good as possible. The theoretical studies must cover everything from the chip circuits to the application structure. In mobile applications there is extremely important that the current consumption becomes minimized because the battery power is limited. The power reductions studies must include the most power costing circuits on the chip. When the whole circuit or segments of the circuit is not in use, they must switch fast and simple into another mode th

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24

Сабокар, Олег Сергійович. "Удосконалення магнітно-імпульсного обладнання для технологій ремонту транспортних засобів". Thesis, Харківський національний автомобільно-дорожній університет, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39634.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.09.13 – техніка сильних електричних та магнітних полів. Національний технічний університет "Харківський політехнічний інститут", Харків 2019. Дисертація присвячена вирішенню завдання поліпшення технічних показників обладнання магнітно-імпульсної обробки металів (міоми) для використання в технологіях металообробки і технологіях ремонту транспортних засобів. У роботі представлена розробка альтернативної конструкції вузла заряду ємнісних накопичувачів енергії та розробка системи індукційного нагріву. Дано числ

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25

Dehghanikiadehi, Abbas. "Commande vectorielle innovante pour véhicules électriques ou hybrides." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC012/document.

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Durant ces dernières années, l'intérêt pour les technologies des véhicules à faibles émissions de carbone a fait un bond important à travers l'Union européenne (UE) et au-delà, encouragé en cela par les gouvernements et les constructeurs automobiles. De grands espoirs ont été mis plus récemment dans les véhicules électriques (VE) et les véhicules électriques hybrides (VEH) en tant que technologies clés pour atténuer le changement climatique, améliorer la sécurité énergétique et favoriser une nouvelle branche de l'industrie dans le secteur automobile. Ainsi, l'électrification des transports a é

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Сабокар, Олег Сергійович. "Удосконалення магнітно-імпульсного обладнання для технологій ремонту транспортних засобів". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39631.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.09.13 – техніка сильних електричних та магнітних полів. Національний технічний університет "Харківський політехнічний інститут", Харків 2019. Дисертація присвячена вирішенню завдання поліпшення технічних показників обладнання магнітно-імпульсної обробки металів (міоми) для використання в технологіях металообробки і технологіях ремонту транспортних засобів. У роботі представлена розробка альтернативної конструкції вузла заряду ємнісних накопичувачів енергії та розробка системи індукційного нагріву. Дано число

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27

Jihad, Hamza El. "Contribution à l'étude des convertisseurs multi-niveaux moyenne tension : réduction d'harmoniques BF et linéarisation de leur tension." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0175.

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Cette thèse traite des convertisseurs de puissance multi-niveaux destinés aux applications d’entraînements électriques, utilisés notamment dans le domaine de l’Oil & Gas et de la propulsion marine, ou bien aux applications réseaux comme la compensation de l’énergie réactive. L’objectif est l’optimisation des commandes de ces convertisseurs de façon à réduire le contenu harmonique de la tension de sortie et donc du courant, paramètre très important pour le dimensionnement à la fois des filtres de sortie et des machines électriques qui y sont connectées. Dans la première partie de ce mémoire

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28

Orfanoudakis, G. I. "Analysis and reduction of dc-link capacitor voltage/current stress in three-level PWM converters." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/352195/.

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Power electronic converters are in the heart of modern renewable energy and motor drive systems. This Thesis focuses on the converter dc-link capacitor (bank), which is a costly component and a common source of failures. The Thesis is divided into two parts. The first part examines the voltage and current stress induced on dc-link capacitors by the three most common converter topologies: The conventional two-level converter, the Neutral-Point-Clamped (NPC) three-level converter, and the Cascaded H-Bridge (CHB) three-level converter. The expressions derived for the rms capacitor current and its

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29

Yadhati, Vennela. "A comparative study of capacitor voltage balancing techniques for flying capacitor multi-level power electronic converters." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Yadhati_09007dcc807d2cc9.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2010.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed July 26, 2010) Includes bibliographical references (p. 96-102).

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30

Adabi, Firouzjaee Jafar. "Remediation strategies of shaft and common mode voltages in adjustable speed drive systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/39293/1/Jafar_Adabi_Firouzjaeel_Thesis.pdf.

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AC motors are largely used in a wide range of modern systems, from household appliances to automated industry applications such as: ventilations systems, fans, pumps, conveyors and machine tool drives. Inverters are widely used in industrial and commercial applications due to the growing need for speed control in ASD systems. Fast switching transients and the common mode voltage, in interaction with parasitic capacitive couplings, may cause many unwanted problems in the ASD applications. These include shaft voltage and leakage currents. One of the inherent characteristics of Pulse Width Modu

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Kulenda, Vít. "Univerzální mikropočítačová jednotka." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219068.

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Master’s thesis contains description parameters of microcontroller ATMEGA644P, also contains differences between older and newer version of microcontrollers ATMEGA644 and ATMEGA644PA. Inside structure of microcontroller, memories and peripherals are described here. The construction of the universal microcontroller unit is main target of this thesis. The unit contains supply, A/D converter, current loop, communication interfaces, temperature sensor, accelerometer and other. The unit collects and saves data, communicates by interfaces and manages other functions. Using devices and circuits are d

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Andler, Daniel [Verfasser]. "Experimental Investigation of Three-Level Active Neutral Point Clamped Voltage Source Converters using Integrated Gate-Commutated Thyristors / Daniel Andler." München : Verlag Dr. Hut, 2014. http://d-nb.info/1051550092/34.

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Kucka, Jakub [Verfasser]. "Quasi-two-level PWM operation of modular multilevel converters : implementation, analysis, and application to medium-voltage drives / Jakub Kucka." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2019. http://d-nb.info/1187440442/34.

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Andler, Osorio Daniel Andrés [Verfasser]. "Experimental Investigation of Three-Level Active Neutral Point Clamped Voltage Source Converters using Integrated Gate-Commutated Thyristors / Daniel Andler." München : Verlag Dr. Hut, 2014. http://d-nb.info/1051550092/34.

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35

Etesami, Mohammadhossein. "On metaheuristics for design and modulation of multilevel inverters." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132309/1/Mohammadhossein%20Etesami%20Thesis_Redacted.pdf.

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Multilevel inverters are introduced as a promising technology for high voltage applications. Associated design limits and control complexities hinder the wide use of multilevel converters. Motor drive overall efficiency is largely affected by the applied modulation technique. Selective Harmonic Elimination (SHE) Pulse Width Modulation (PWM) is a modulation technique which gives an excellent outcome suppressing low-order detrimental harmonics. Solving of the associated highly nonlinear equation set in SHE PWM has been one of the widely discussed numerical problems in power electronics. Three ke

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Pou, Félix Josep. "Modulation and control of three-phase PWM multilevel converters." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6327.

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La present tesi doctoral estudia els inversors trifàsics multinivell del tipus denominat de díodes de fixació (diode-clamped converters). Aquests convertidors poden generar tres o més nivells de tensió a cada fase de sortida, i normalment s'apliquen a sistemes de gran potència ja que poden treballar amb tensions majors que els inversors clàssics. L'anàlisi es centra fonamentalment en la topologia de tres nivells, tot i que també es realitzen contribucions per a convertidors de més nivells. Els principals objectius són la proposta de nous algorismes de modulació vectorial PWM de processat ràpid

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Wilson, Veas Alan Hjalmar [Verfasser], Steffen [Gutachter] Bernet, Mariusz [Gutachter] Malinowski, and Steffen [Akademischer Betreuer] Bernet. "Investigation of Multi-Level Neutral Point Clamped Voltage Source Converters using Isolated Gate Bipolar Transistor Modules / Alan Hjalmar Wilson Veas ; Gutachter: Steffen Bernet, Mariusz Malinowski ; Betreuer: Steffen Bernet." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1226899463/34.

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Chvátal, Michal. "Řízení dodávky vody v rodinném domě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442453.

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The diploma thesis deals with the design and implementation of the system that will control the water supply for the family house and its garden. The system aslo allows you to store a history that can be viewed via the web interface. The web interface also allows you to set system parameters and monitor the current status.

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Wu, Chia-Hsuan, and 吳佳軒. "Bidirectional Multi-level Converter with Voltage Balance of Batteries." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/69163926143752161728.

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博士<br>國立彰化師範大學<br>電機工程學系<br>104<br>In this dissertation, a bidirectional multi-level converter with voltage balance of batteries is successfully developed. By combining the battery balancing control and the multi-level converter, bidirectional AC/DC power transmission and battery balancing charging/discharging are achieved without the need of an additional battery balancing circuit. In this dissertation, topologies of commonly used bidirectional multi-level converters are first investigated. Here, the cascaded half bridge multilevel converter is selected because of its smaller number of compon

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Zih-Yong, Chen, and 陳子雍. "Study of a Three Level Hybrid Converter for High Input Voltage." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/95875335631400103770.

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碩士<br>國立雲林科技大學<br>電機工程系<br>102<br>This thesis studies and implements a three level hybrid converter for high input voltage and high load current applications. Power switches in the proposed converter can be achieved at zero voltage switching based on the resonant behavior by resonant inductor and output capacitance of power switches. Thus, the switching losses of power switches are reduced. For high input voltage and high output current applications, two input aluminum capacitors and series power switches are adopted to limit the voltage stress of power switches at Vin/2. Flying capacitor is a

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Huang, Chien-lan, and 黃建嵐. "Analysis and Implementation of Novel Three-level Zero-Voltage-Switching Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/26943888140113270592.

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博士<br>雲林科技大學<br>工程科技研究所博士班<br>98<br>This dissertation proposes two kinds of interleaved zero-voltage-switching (ZVS) three-level pulse-width modulation converters with current doubler rectifier. The switches connected in series is adopted to reduce the voltage stress on switches. One fast recovery diode is connected between the middle point of split capacitors and power switch to generate three different voltage levels on the primary side of transformer. All switches can achieve ZVS turn-on at the resonant interval based on the junction capacitance of switches and transformer leakage inductanc

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Chang, Jyun-Jhe, and 張濬哲. "High-voltage Bi-directional Half-bridge Three-level Series Resonant Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/k2jvq8.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>This thesis aims to develop a bi-directional half-bridge three-level series resonant converter for high-voltage DC micro-grid. The use of a three-level circuit topology can reduce the device stresses and electromagnetic interference. The clamped diode and capacitor can provide an appropriate current path to achieve zero-voltage switching on power switches. By modulating frequency appropriately, the resonant tank can be operated in SRC region and achieve bi-directional power conversion. With the switching method developed in this thesis, the circuit has a chara

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Chang, Chen-Han, and 張振漢. "The Study of Multi-Level Converter for Voltage and Current Quality Improvement." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/57674421933262680887.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>94<br>In the technology developing society, the supply of the power source is needed in many different situations. How to improve the voltage variation and harmonic current in the ac system will be discussed in this thesis. In order to solve these problems, the multi level PWM technology. Which lower voltage stress components, and lower voltage harmonic characteristic, is presented. The cascade circuit can reduce voltage stress components. The current harmonic distortion and voltage variation are very important in the power quality problem. In this thesis, the mu

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Hou, Xu-Qi, and 侯旭琦. "Implementation of a Three-Level Phase-Shifted Zero-Voltage-Switching Power Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/97531171786776650119.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>94<br>In this thesis, a three-level phase-shifted zero-voltage-switching power converter is studied and implemented. The voltage across the switches is half of the input voltage. Thus, the problem of choosing switches at high power applications is improved. The converter uses the well-known phase-shift control to achieve zero voltage switching (ZVS), and it reduces the switching loss. The detailed operational principle and analysis of the three-level phase-shifted zero-voltage switching power converter are described in this thesis. In addition, the process of de

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Liao, Jian-Ting, and 廖健廷. "Study and Implementation of a Three-Level Zero-Voltage Switching Converter with Efficiency Improvement." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/18174768644836930309.

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碩士<br>國立雲林科技大學<br>電機工程系<br>102<br>This paper presents a three-level zero-voltage DC-DC converter with phase-shift pulse-width modulation (PWM) control for high input voltage application. In the proposed converter, power switches can be achievedat zero voltage switching (ZVS). The circuit architecture of the proposed converter includes a three-level circuit with phase-shift PWM schemein the primary side and an auxiliary passive snubber in the secondary side in order to reducethe circulating current and improve circuit efficiency. First, the three-level circuit can reduce the voltage stress of p

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Lien, Wen-Yuan, and 連文源. "A Half-Bridge ZVS Three-Level DC-DC Converter for High Input-Voltage Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99187620917638491112.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>101<br>The main purpose of this thesis is to analyze a half-bridge zero-voltage-switching (ZVS) three-level DC-DC converter, which is suitable for high input-voltage applications. The voltage stress of the primary-side power switch is equal to half the input voltage. Therefore, it is easy to choose the power switch device. The control method adopts the commonly-used commercial analog IC UCC3895 to reach ZVS and reduce the switching loss effectively. So the conversion efficiency can be improved. With the aid of the simulation software tool, a 750-W DC-DC converter wit

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Wu, Bo-Han, and 吳柏翰. "Study and Realization of an Interleaved Zero-Voltage Switching Three-Level AC/DC Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/en7772.

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碩士<br>國立宜蘭大學<br>電機工程學系碩士班<br>107<br>An interleaved zero-voltage switching three-level AC/DC converter is studied and realized in this thesis. The proposed converter integrates boost rectifier and three-level converter into a single-stage converter and adds the LCC resonant technique to make the main power switch operate at ZVS-switching, which can reduce switching losses and improve the total conversion efficiency. The front end adopts boost power factor corrector, which can reduce the conduction losses of the circuit and provide high power factor. In addition, the three-level topology can gre

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LIN, YUE, and 林岳. "Analysis and Development of Three Level Phase Shift Converter with Wide Input Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2c56xj.

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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>This thesis proposes a three-level phase-shift pulse-width modulation (PWM) converter with 10:1 wide input voltage range. The main advantages of the proposed converter are wide input voltage operation and high output current capability for DC/DC converters. Based on the phase-shift PWM control approach, the leading-leg switches of three-level converter can achieve zero voltage switching (ZVS) from low load to full load. In order to solve the narrow range of input voltage opration on conventional three-level converters, a new three-level converter is proposed i

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Freire, Diogo Filipe Martins. "Multi-Level Converter with Predictive Control for Power Conditioning." Master's thesis, 2018. http://hdl.handle.net/10316/86563.

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Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e Tecnologia<br>A estabilidade de tensão e o controlo do factor de potência são dois pontos-chave na operação em regime permanente dos sistemas eléctricos. O static synchronous compensator e o seu sistema de controlo podem ser usados para melhorar o desempenho do sistema energia. Neste trabalho é usado um controlador preditivo com uma nova abordagem de geração de referências e que permite compensar a potência reactiva necessária para manter um fator de potência escolhido no fina

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Tsung-HsunLee and 李宗勳. "Implementation of the Three-Level DC-DC Converter Applied in Medium-Voltage Solid-State Transformer." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/pkw867.

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碩士<br>國立成功大學<br>電機工程學系<br>106<br>As the progress of wide-bandgap (WBG) semiconductor devices and the rise of distributed energy resources (DER), medium-voltage solid-state transformer (SST) becomes more and more popular in recent years. Medium-voltage SST features high-performance and fantastic functionality. The SST proposed in this thesis is applied in 11.4 kVAC distribution system, and the DC stage of the SST is composed of 13 modules. Operating principle, steady-state analysis and components design of the converter as well as the parameter design, insulation consideration and loss optimiza

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