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Dissertations / Theses on the topic 'Snubber'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Lima, Luiz Ricardo. "Inversor monofásico NPC com snubber regenerativo." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/2089.

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Made available in DSpace on 2016-12-12T20:27:39Z (GMT). No. of bitstreams: 1 Luiz Ricardo Lima.pdf: 7933900 bytes, checksum: 225fa96a5d447127d12b2a23f0483893 (MD5) Previous issue date: 2011-08-12<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work presents a study about the NPC (Neutral Point Clamped) three-level inverter with a modified Undeland snubber and using a Buck-Boost converter to regenerate the energy processed by the snubber. Initially, qualitative and quantitative analysis of this inverter with the presence of the snubber are presented and a project method

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2

Wei, Yu. "A Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83238.

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In the application of power inverters, power density has become a key design specification where it has stringent requirements on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter size thus further shrink overall space. While still maintaining decent power conversion efficiency and low electromagnetic interference (EMI) with higher switching frequency, soft-switching needs to be implemented. A novel auxiliary resonant snubber is introduced. The design and operation are carried o

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3

Faraci, William Eric. "Design of a Resonant Snubber Inverter for Photovoltaic Inverter Systems." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/47800.

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With the rise in demand for renewable energy sources, photovoltaics have become increasingly popular as a means of reducing household dependence on the utility grid for power. But solar panels generate dc electricity, a dc to ac inverter is required to allow the energy to be used by the existing ac electrical distribution. Traditional full bridge inverters are able to accomplish this, but they suffer from many problems such as low efficiency, large size, high cost, and generation of electrical noise, especially common mode noise. Efforts to solve these issues have resulted in improved solut

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4

Chen, Yen-Ming. "RC Snubber Design using Root-Loci Approach for Synchronous Buck SMPS." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/963.

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This thesis presents an analytical approach using Root-Loci method for designing optimum passive series RC snubbers for continuous-current synchronous buck switch mode power supply (SMPS). Synchronous buck SMPS is the most popular power converter topology found in modern consumer electronics. It offers relatively good efficiency to target the high-current and low-voltage requirements while it is also relatively inexpensive to implement. Passive series RC snubbers are simple, efficient and cost-effective open-loop equalizer circuit for synchronous buck SMPS. Its purpose is t

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5

姚建明 and Jianming Yao. "Control schemes and performance improvement of resonant snubber soft-switching inverters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31220198.

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6

Yao, Jianming. "Control schemes and performance improvement of resonant snubber soft-switching inverters /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2051007X.

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7

Tang, Yuqing. "High Power Inverter EMI Characterization and Improvement by Auxiliary Resonant Snubber Inverter." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/31022.

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Electromagnetic interference (EMI) is a major concern in inverter motor drive systems. The sources of EMI have been commonly identified as high switching dv/dt and di/dt rates interacting with inverter parasitic components. The reduction of parasitic components relies on highly integrated circuit layout and packaging. This is the way to deal with noise path. On the other hand, switching dv/dt and di/dt can be potentially reduced by soft-switching techniques; thus the intensity of noise source is reduced. <p> In this paper, the relation between the dv/dt di/dt and the EMI generation are dis

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8

Combrink, Frederik Wilhelm. "Analysis and synthesis of an active resonant snubber for high-power IGBT converters." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52090.

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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: This thesis describes the study of two soft-switching inverter topologies that are well suited to high-power applications. For the first topology, namely an active resonant turn-off snubber, the existing theory is expanded with a detailed study into operation strategies and topology protection. This is followed by an investigation into the second topology, which is a combined snubber that reduces both turn-off and turn-on losses. The investigation involves a detailed analysis of the losses in the snubber components

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9

Novaes, Yales Rômulo de. "Estudo de um Snubber para o inversor de três níveis com netro grampeado." Florianópolis, SC, 2000. http://repositorio.ufsc.br/xmlui/handle/123456789/79250.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.<br>Made available in DSpace on 2012-10-18T00:59:22Z (GMT). No. of bitstreams: 0Bitstream added on 2014-09-25T18:45:10Z : No. of bitstreams: 1 182239.pdf: 4426878 bytes, checksum: 85f08d8cd86db634a6d92cbdfba27250 (MD5)<br>Este trabalho apresenta o estudo do inversor Três Níveis, também conhecido como inversor com ponto neutro grampeado, da sigla inglesa N.P.C. Inicialmente, são explicados os princípios de funcionamento do inversor, através da utilização da estra

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10

Ngatu, Grum T. "Development of a snubber type magnetorheological fluid elastomeric lag damper for helicopter stability augmentation." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9326.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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11

Sperb, Jonathan Dômini. "Projeto de um inversor trifásico com snubber de undeland regenerativo e controle digital implementado no DSP TMS320F2812." Universidade do Estado de Santa Catarina, 2007. http://tede.udesc.br/handle/handle/1886.

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Made available in DSpace on 2016-12-12T17:38:35Z (GMT). No. of bitstreams: 1 Jonathan Domini Sperb.pdf: 5918080 bytes, checksum: ca2651157f2d17c4c98cd0a08aeee98c (MD5) Previous issue date: 2007-08-03<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work deals with the design and implementation of the digital instantaneous averaged values control for output voltages of the three-phase inverter with Underland s snubber, using the Buck-Boost converter for regeneration of the snubber s energy. The qualitative and quantitative analysis of the inverter power structure, snubbe

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12

Fant, Sebastian. "A design of a future 10 kW converter." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11438.

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<p>This master thesis aim to design and evaluate a high power 3-phase DC/AC and AC/AC converter. The purpose is to use it for an electric motor in an aircraft possibly driving electric actuators, a propeller in an UAV or a small vehicle. Factors such as power loss and weight are of importance and will be estimated using known models supplied by various manufacturers of components. Different topologies of semiconductors suitable for this purpose are examined and presented. Extensive resources have been put to properly select the most suitable switching device according to their power loss and w

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13

Alnasseir, Jamal. "Theoretical and experimental investigations on snubber circuits for high voltage valves of FACTS-equipment for over-voltage protection." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=98477839X.

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14

Borra, Venkata Shesha Vamsi. "Design and Modeling of High Performance LED Dimming Driver with Reduced CurrentSpikes using Turn-On Snubber across Power MOSFET." Youngstown State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1402958388.

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15

Burgardt, Ismael. "Conversor SEPIC empregando um snubber regenerativo associado a um regulador linear de corrente para acionar e controlar LEDs de potência." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1467.

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CAPES<br>Este trabalho apresenta um sistema eletrônico com entrada universal utilizando um retificador SEPIC não isolado para fornecer e controlar a corrente de LEDs de potência. Um Snubber regenerativo que reduz as perdas de comutação e melhora a eficiência do sistema é proposto. Para realizar a dimerização, bem como reduzir a ondulação da corrente nos LEDs, um regulador linear de corrente é conectado na saída do conversor SEPIC. A utilização do regulador linear também permite que o conversor opere com entrada universal sem a utilização de circuitos adicionais. Para evitar perdas excessivas,

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16

Žamberský, Jan. "Zvyšující měnič napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241973.

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Práce se zabývá popisem jednotlivých typů zdrojů s důrazem na izolované topologie. Poté je rozebírána nejvhodnější volba pro zdroj na anodické bondování, kde jsou kladeny požadavky na vysoké výstupní napětí s malým proudem. Další část rozebírá problematická místa návrhu a na co je třeba dávat pozor. Poté je proveden vlastní návrh zdroje s popisem optimalizačních kroků. Tento zdroj je odsimulován. Dva rozdílné přístupy k realizaci takového zdroje jsou poté porovnány a nejlepší je vybrán. Je ukázána možnost, jak realizovat bipolární výstup. V poslední části je tento zroj sestaven a proměřeny jeh

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17

Moozhikkal, Rahul. "Design of Resonant Converters using Silicon Carbide Power." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201662.

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The design of series-loaded resonant converters using the state of the art SiC power transistorsis investigated in the thesis. SiC devices are chosen as they offer lower switching losses comparedto conventional Si based devices A very detailed study about the working and differentmodes of operation of the resonant converter is carried out. The thesis further explains how thehigh speed switching capabilities of the SiC devices remain untapped owing to the presence ofstray inductances in the switch-snubber layout. A comparison of all the commercially availableSiC devices are carried out to find

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18

Pesce, Alberto. "Passive protections against breakdown effects in Neutral Beam injection devices for nuclear fusion experiments." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3427365.

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The necessity of new and clean technologies for energy production from one hand and the carbon dioxide emission regulations on the other are inducing nuclear fusion research to speed towards a possible future energy source. So the next experiment, which is being built in France, called ITER (acronym for International Thermonuclear Experimental Reactor, an international collaboration between European Union, Japan, Russian Federation, India, China, South Korea and United States of America) has to give an answer on the real feasibility to achieve nuclear fusion, and in particular on the possibili

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19

Sehil, Khaled. "A super-capacitor based energy storage for quick variation in stand-alone PV systems." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16222.

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Photovoltaic (PV) system is one of the most prominent energy sources, producing electricity directly from sunlight. In additionally, it is easy to install and is supported financially by many governments as part of their strategy to reduce CO2 gas emissions, and to achieve their agreed set of reduction targets by 2020. In the meantime, researchers have been working on the PV system to make it more efficient, easy to maintain, reliable to use and cost effective. In the stand-alone PV system, a battery is required. This is due to the fluctuating nature of the output energy delivered by the PV ar

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20

Benda, Dušan. "Soustava DC/DC měničů pro solární panely fotovoltaické elektrárny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377104.

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This master thesis describes the design of a DC/DC converter for one photovoltaic panel with a 250 W peak power. The master thesis is divided into parts dealing with detailed design of power electronics, analog circuit design, description of control MPPT algorithms and software for control circuit. The chapter with the mathematical modeling of the converter created in the Matlab Simulink was added beyond the assignment.

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21

Dundáček, Martin. "Mikroprocesorový modul řízení SS motoru se zpětnou vazbou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217259.

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This thesis deals with DC motor control. Main goal was design and realization of DC motor controler module with feedback. The first part dwells on methods for DC motor control and HW design of control module. The second part describes development of software for the module, testing and sums up results.

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22

Chen, Zheng. "Electrical Integration of SiC Power Devices for High-Power-Density Applications." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23923.

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The trend of electrification in transportation applications has led to the fast development of high-power-density power electronics converters. High-switching-frequency and high-temperature operations are the two key factors towards this target. Both requirements, however, are challenging the fundamental limit of silicon (Si) based devices. The emerging wide-bandgap, silicon carbide (SiC) power devices have become the promising solution to meet these requirements. With these advanced devices, the technology barrier has now moved to the compatible integration technology that can make the best o

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23

LI, QUAN, and q. li@cqu edu au. "HIGH FREQUENCY TRANSFORMER LINKED CONVERTERS FOR PHOTOVOLTAIC APPLICATIONS." Central Queensland University. N/A, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060830.110106.

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This thesis examines converter topologies suitable for Module Integrated Converters (MICs) in grid interactive photovoltaic (PV) systems, and makes a contribution to the development of the MIC topologies based on the two-inductor boost converter, which has received less research interest than other well known converters. The thesis provides a detailed analysis of the resonant two-inductor boost converter in the MIC implementations with intermediate constant DC links. Under variable frequency control, this converter is able to operate with a variable DC gain while maintaining the resonant condi

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24

Lind, Pablo. "Snubbar med klass – en semiotisk analys av bilder från Instagramkontot Snubbarinreder." Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-21451.

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My study contains a semiotic analysis of two photos posted by the Instagram account Snubbarinreder, an account that posts photos of homes allegedly belonging to men. There are clear tendencies on the account to portray men as heavy consumers of alcohol and video games alongside a general inability or disinterest in caring for a home. My study is based mainly on studies by Beverly Skeggs and Göran Eriksson on how the working class are commonly portrayed in the media. The purpose of the study is to investigate aspects of class in the portrayal of men in the posted photos. Eriksson and Skeggs exp

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25

Thudén, Johansson Marie, and Hagström Susanne Reimertz. "Snubbla inte i skoltrappan : En studie om ogiltig skolfrånvaro." Thesis, Högskolan Väst, Avd för socialpedagogik och sociologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-4377.

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Syftet med studien är att beskriva hur involverad skolpersonal och samverkande socialsekreterare arbetar för att kartlägga och motverka elevers ogiltiga frånvaro. Genom att undersöka personalens upplevelse av orsaker till ogiltig frånvaro, hur de upplever att de arbetar med ogiltig frånvaro och hur de tillsammans arbetar för att motverka ogiltig frånvaro. Den aktuella publicerade forskning som använts är både internationell och nationell. Styrdokument, lagtext, allmänna råd samt forskning av Skolverket och Socialstyrelsen har även beaktats. Det teorietiska perspektiv som ligger till grund för

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26

Sucu, Mehmet. "Parametric average value modeling of flyback converters in ccm and dcm including parasitics and snubbers." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38157.

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Modeling of switched-mode DC-DC converters has been receiving significant interest due to their widespread applications. Averaged modeling is the most common approach (and tool) that has been used to analyze dynamic performance of converter circuits. Specifically, state-space averaged models are widely used because of their simplicity and generality. However, as has been shown in the literature, the challenges of directly applying this approach to predict the discontinuous variables (states) and include the parasitics and losses have limited application of this approach to a wider range of con

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Amini, Akbarabadi Soroush. "Circuit averaging and numerical average value modeling of flyback converter in CCM and DCM including parasitics and snubbers." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/47052.

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Modeling and analysis of basic DC-DC converters is essential for enabling power-electronic solutions for the future energy systems and applications. Average-value modeling (AVM) provides a time-efficient tool for studying power electronic systems, including DC/DC converters. Many AVM techniques including the analytical and numerical state-space averaging and circuit averaging have been developed over the years and available in the literature. Average-value modeling of ideal PWM converters neglects parasitics (losses) to simplify the derivations and modeling procedures, and the resulting models

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Chotpitayasunondh, Varoth. "An investigation of the antecedents and consequences of "phubbing" : how being snubbed in favour of a mobile phone permeates and affects social life." Thesis, University of Kent, 2018. https://kar.kent.ac.uk/70881/.

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Smartphones have changed the way people interact with each other in modern society. However, while they are becoming more omnipresent in human life, there is increasing concern that they are often used at inappropriate times during social interactions, and that people often ignore others in favour of their phones. In this thesis, we explore the phenomenon of "phubbing" - the act of snubbing someone in a social setting by concentrating on one's mobile phone. In a series of ten empirical studies, we demonstrate that Internet addiction, fear of missing out, and self-control predict smartphone add

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29

Severi, Matteo. "Studio sui convertitori flyback multiuscita." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6503/.

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Questa tesi si propone di analizzare e comprendere il funzionamento del convertitore flyback, un circuito elettronico appartenente alla categoria dei convertitori DC/DC operanti in commutazione, avvalendosi anche dell’ausilio del software per la simulazione circuitale LTSPICE. Vengono dettagliatamente analizzati gli effetti delle disperse del trasformatore, valutato l'inserimento di snubber dissipativi, analizzato il comportamento dinamico del convertitore retroazionato, presa in considerazione la possibilità di inserire ulteriori uscite.

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Al-fadli, Azhar, and Berggren Sara Hofberg. "“Barn som snubblar utan snubbeltråd” : En studie om hur barn i grovmotoriska svårigheter kan stöttas,stimuleras och utmanas i förskolan." Thesis, Umeå universitet, Institutionen för tillämpad utbildningsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-143586.

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Syftet med denna studie är att belysa verksamma förskollärares upplevelser av arbetet med attstötta, stimulera och utmana barn i grovmotoriska svårigheter. Denna studie är således enkvalitativ studie med semistrukturerade intervjuer med sex förskollärare på sex olikaförskolor. Studiens forskningsfrågor har behandlat verksamma förskollärares upplevelser avderas arbetssätt, erfarenheter och orsaker till att barn befinner sig i grovmotoriska svårighetersamt förutsättningar för att stötta, stimulera och utmana dessa barn i förskolan. Denna studiehar sin utgångspunkt i ett relationellt perspektiv d

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Shah, Vatsal Sonikbhai. "Optimization and Up-Gradation of 3-Phase Half-Bridge Inverter Board." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-173664.

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Solar Bora AB is a Linköping based company that provides end to end solution for clean and reliable energy. System developed by them generates high power 230V AC to run electrical appliances. The system consist of string of batteries which are charged by rooftop solar cells and the energy stored in the batteries is converted to AC to provide a grid voltage like experience even though the system is not connected to a grid. Energy stored in the batteries need to be converted from DC to AC efficiently. Inverter used for conversion should be efficient enough to reduce losses. This master thesis de

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Wei, Hsiao-Chi, and 魏孝麒. "Research of passive lossless snubber for." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/11026402330081629151.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>96<br>With the ongoing development of power electronics technology, the inverter of IGBT are widely applied to power converting applications. It is well known that output over-voltage and energy loss during switching of inverter are the main causes for the damage of power electronic devices. To solve this problem, we first characterize the general behavior of IGBT with research, then energy loss of IGBT in both hard switching and soft switching is empirically studied. Based on these simulation results, this thesis proposes a new kind of snubber using passive lossles

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Sheu, Chang-Jyi, and 許昌吉. "A Passive Lossless Snubber for ZCS Design." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/40217542549633288540.

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LI, TIAN-YANG, and 李天陽. "The design and application of IGBT snubber circuit." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/38468338355799620102.

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Cheng, Yu-nan, and 鄭玉南. "Study on the Snubber Circuits for a Flyback Converter." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/qtkztw.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>94<br>This thesis aims at the analysis of an active-clamping flyback converter. The comparisons between the active-clamping flyback converter and the conventional flyback converters adopting passive snubbers are made. The resonant tank of the active-clamping flyback converter consists of the leakage inductance of the transformer and the parasitic capacitance of the switch. The zero-voltage swtiching can be achieved by adequately design the circuit parameters. The conversion efficiency can thus be raised and the voltage spike on the switch can be reduced. Also the los

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peng, Shin wei, and 彭信瑋. "A Soft Switching Motor Drive Using an Active Snubber." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/2fs76s.

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碩士<br>國立臺北科技大學<br>車輛工程系所<br>101<br>This thesis proposes a pulse-width-modulation (PWM) inverter with the soft switching for the brushless DC motor (BLDCM) of the electric scooter. This motor drive could reduce switching losses, increase driving and regenerative efficiency. Moreover, this system could obtain some advantages, such as low cost and high efficiency which the capacitance is easily designed in the switched capacitor snubber. In the switching control method of this motor driver, a bidirectional conduction of inverter is used to match the relationship of the three-phase voltage of BLDC

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CHIH, LIN KUN, and 林琨智. "An Efficient Active LC Snubber for Multi-Output Converters." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/37255646858927827851.

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碩士<br>義守大學<br>電機工程學系<br>91<br>An efficient active LC snubber for multi-output converters is proposed in this paper. The proposed active LC snubber can be used to reset transformer and suppress switching surges. Besides, by storing surge energy in the proposed active LC snubber and then releasing it to the flyback auxiliary output, the converter can achieve high efficiency. For a forward converter with flyback auxiliary output,91.02%,the maximum output efficiency, can be achieved. For the SR forward converter with active LC snubber, 93.72%, the maximum output efficiency, can be achieved.

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Lin, Meng-Hung, and 林孟宏. "A Soft Switching PWM Boost Converter Using an Active Snubber." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/86675320030078492722.

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碩士<br>國立海洋大學<br>電機工程學系<br>91<br>It has been known that normal switching power supply utilize one or more switches to transform DC from one level to another. When the switch of circuit is turned on or turned off, it has switching power losses. In order to lower volume and weight of converter its frequency needs to be raised for power density. It makes switching power loss of circuit larger than before. The efficiency of system is also reduced when the switching frequency is increased. There is a method to solve this problem. It is a soft switching technique. The paper uses soft switc

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Liu, Wen-Yuan, and 劉文淵. "Study and Implementation of LCD Snubber for a Forward Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98190222133510502958.

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碩士<br>崑山科技大學<br>電機工程研究所<br>98<br>The circuit design, simulation, and implementation of a forward converter with LCD snubber are presented in this thesis. The LCD snubber is composed of an inductor, a capacitor and a diode, known as passive and non-dissipative flux reset mechanism for single-ended forward converter. The capacitor of the snubber also resets the energy stored in the leakage inductor and hence, minimizes the spike voltage and reduces the EMI/RFI during the OFF period. The operational principles of the LCD snubber are analyzed in detail during steady state. According to the energy

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Yang, Zhen-Yu, and 楊鎮宇. "Multi-objective Optimization for RCD Snubber of DC-DC Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/83877765414325253465.

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碩士<br>國立高雄第一科技大學<br>系統資訊與控制研究所<br>100<br>In this paper, we propose that Multi-objective algorithm and the Taguchi method be employed in the optimal design of a DC-DC converter with an RCD snubber. The RCD snubber is usually used in flyback converter to limit the voltage spikes which are caused by leakage inductance of the transformer. The design considerations of RCD snubber are commonly two objectives: (1) minimize power loss in the snubber ; (2) minimize the voltage spikes across the transistor. But the RCD design consideration for voltage spikes suppression is usually in contradiction with

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Lin, Chuan-Che, and 林傳哲. "A Novel High Gain Boost Converter with Active Snubber Circuit." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3y8n6j.

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碩士<br>輔仁大學<br>電機工程學系碩士在職專班<br>106<br>The thesis presents a method to achieve a high voltage gain by voltage stacking technology and increasing the number of secondary winding of the coupled inductor. Then, the active snubber circuit is added to absorb the spike energy of the transformer leakage inductance for reducing the surge in the source system. Experiments and simulation results are used to verify the performance of the proposed converter operated in continuous conduction mode (CCM), discontinuous conduction mode (DCM) and boundary condition mode (BCM).

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Ai, Tsu-Hua, and 艾祖華. "Integrated AC/DC Converters with Power Factor Correction and Nondissipative Snubber." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/sgt3q6.

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博士<br>國立成功大學<br>電機工程學系碩博士班<br>90<br>In this dissertation, various integrated AC/DC converters with power factor correction and nondissipative snubber are discussed. A novel integrated AC/DC converter with power factor correction and line-frequency ripple suppression is proposed. And a novel nondissipative snubber integrated with AC/DC converters is also proposed. 　　The proposed topology combines an integrated flyback and forward circuits with a post regulator. The integrated flyback and forward circuits function as two sub-converters that share the total output power. To maintain a high power

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Chien, Shih Chieh, and 簡士傑. "The Integration of Semiconductor Power Switch and Built-in Snubber Circuit." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/21655893864551675630.

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碩士<br>東海大學<br>電機工程學系<br>101<br>The power components in the transient state of switching will cause voltage overshoot on the circuit that is particularly serious to the system safty. In this thesis, we use the C++ language to design flyback circuits. It will be easier to design, make compareisons between different designs, and analyze flyback circuits with different specifications by using a computer program. In the analysis of snubber circuit, we simplify the complicated circuit to a equivalent circuit. Then, we use four work steps to derive the equations. Finally, we use Matlab language to pe

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Yu-HauHuang and 黃昱豪. "Forward-Flyback Converter with Snubber-feedback Network for Contactless Power Supply Application." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/14100293074439214731.

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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>98<br>This thesis presents a proposed forward-flyback converter with the snubber-feedback network for the contactless power supply applications. In order to reduce the component count and volume, the output inductor and transformer are integrated with the proposed magnetic integration technology. Since the contactless power supply has the low conversion efficiency and low load regulation, the snubber-feedback network is applied to overcome these drawbacks. In the snubber-feedback network, an auxiliary winding of the integrated transformer is utilized as both the m

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Cheng-ShingShieh and 謝正勳. "Universal-Input Single-Stage PFC Flyback LED Driver with Lossless Snubber Circuit." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/22076203742961083464.

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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>99<br>This thesis presents a proposed universal-input single-stage PFC flyback LED driver with the lossless snubber circuit. In order to provide high power factor and low total harmonic distortion, the single-stage PFC flyback converter is employed. Moreover, in order to reduce the voltage stress on the power switch, increase the power-conversion efficiency, regulate the output voltage, the concepts of the lossless-snubber network and the isolated output-voltage-sensing network are adopted. The two windings of the lossless-snubber network and the output-voltage-se

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Lee, Hung-chi, and 李鴻麒. "The Influence of Passive Snubber Circuits on Conducted Emission of Switching Power Converters." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/77450509956025119508.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>95<br>In this thesis, three kinds of representative snubbers are discussed, including R-C, R-C-D and L-C-D snubbers, respectively. R-C snubber, a dissipative snubber, associating with circuit leakage inductance is to form a R-L-C circuit to eliminate overvoltage and ring wave around the power device so as to suppress ring wave EMI. R-C-D snubber, a dissipative and polarized snubber, acts as a capacitor to prolong the rise time of voltage waveform around the power switch so as to suppress EMI resulted from rise time changed by voltage variation in power regulation. Th

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Mo, Sheng-Zhi, and 莫勝智. "Analysis and Design of a Bridgeless Isolated SEPIC Converter with Active-Clamp Snubber." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/96649146363749344830.

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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>100<br>A bridgeless isolated SEPIC converter with active-clamp snubber is presented. This converter uses the bridgeless topology to reduce the rectifier diodes and improve the efficiency. The proposed converter is operated on the fixed frequency, and its input current consists of CCM and DCM parts simultaneously. During some parts of the line frequency, the converter is operated in the DCM so it can achieve the high power factor and confirm to the requirement of IEC 61000-3-2 class D. Although the converter is partly operated in the CCM will decrease the power fac

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Yu, Ching-Ho, and 游景賀. "Design of Buck Type Snubber Synchronous Rectification of Full-Bridge Phase-Shift Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5xgj53.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>107<br>In the applications of full bridge, phase shift is a most popular architecture. It has an excellent performance on efficiency thanks to soft-switching, especially in high power high voltage applications. However, whether the secondary side uses synchronous rectification or non-synchronous rectification, it will produce the voltage spike on secondary rectifier switches. The voltage spike increases the voltage stress of rectifier switches. This thesis proposes a new type of buck snubber circuit not only to clamp the voltage spike but also to replace the of clamp

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Hsu, Tsen, and 許涔. "Design of Active Snubber for Synchronous Rectification MOSFET of Full-Bridge Phase-Shifted Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/51543643377230836274.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>Full-bridge phase-shift converter has the merit of zero-voltage switching (ZVS) which can reduce the switching loss and the high frequency noise interference. However, there will be voltage spike induced on the secondary side synchronous rectification MOSEFTs. This thesis presents the study upon an active snubber circuit which is designed to reduce the spike. This active snubber is compared with the well-known RC and RCD passive snubbers. The stray energy on the secondary-side is restored to the snubber capacitors, then the snubber transfers the stored energy

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Wen, Hsiu-tziu, and 溫修梓. "Applications of Interleaved Forward Converter with Single-Capacitor Turn-off Snubber for Stunning Poultry." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/19317426496178333427.

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碩士<br>逢甲大學<br>電機工程所<br>94<br>This thesis presents a design of the poultry electric stunner. An interleaving forward converter with a single-capacitor snubber to smooth out switch turn-off transient the drain-source voltage of metal-oxide-semiconductor field effect transistor(MOSFET) switch to reduce turn-off loss is proposed to improve the conversion efficiency. In addition, the converters are operated on the boundary of continuous and discontinuous conduction modes to reduce output current ripple, as compared with the counterparts of conventional converter under full load condition, about 3%

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