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Dissertations / Theses on the topic 'Flying capacitor multilevel converter'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Watkins, Stephen James. "Optimal control of multilevel flying-capacitor converters." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424230.

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2

Du, Toit Daniel Josias. "Predictive control of a series-input, parallel-output, back-to-back, flying-capacitor multilevel converter." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18087.

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Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: This thesis investigates the viability of constructing a solid-state transformer (SST) with a series-input, parallel-output connection of full-bridge, three-level ying-capacitor converters. It focusses on the active recti er front-end of the SST which is used to control the input current to be sinusoidal and in-phase with the sinusoidal input voltage. A stack of two converters are built and tested. The input current, as well as the ying capacitor voltages of the two active rect

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3

Hansmann, Chirstine Henriette. "Active capacitor voltage stabilisation in a medium-voltage flying-capacitor multilevel active filter." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1762.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.<br>A switching state substitution must be developed that will make use of both single-phase redundancies and three-phase redundancies in the flying-capacitor topology. Losses should be taken into consideration and the algorithm must be designed for implementation on the existing PEC33 system, with on-board DSP (TMS320VC33) and FPGA (EP1K50QC208). The specific power-electronics application is a medium-voltage active filter. Existing capacitor voltage stabilisation schemes are investigated and a capac

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4

Zare, Firuz. "Multilevel converter structure and control." Thesis, Queensland University of Technology, 2001. https://eprints.qut.edu.au/36142/7/36142_Digitsed%20Thesis.pdf.

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In recent years, multilevel converters are becoming more popular and attractive than traditional converters in high voltage and high power applications. Multilevel converters are particularly suitable for harmonic reduction in high power applications where semiconductor devices are not able to operate at high switching frequencies or in high voltage applications where multilevel converters reduce the need to connect devices in series to achieve high switch voltage ratings. This thesis investigated two aspects of multilevel converters: structure and control. The first part of this thesis foc

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5

Song, Byeong-Mun. "Voltage Balancing Techniques for Flying Capacitors Used in Soft-Switching Multilevel Active Power Filters." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/30026.

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This dissertation presents voltage stabilization techniques for flying capacitors used in soft-switching multilevel active power filters. The proposed active filter has proved to be a solution for power system harmonics produced by static high power converters. However, voltage unbalance of the clamping capacitors in the active filter in practical applications was observed due to its unequal parameters. Thus, the fundamentals of flying capacitors were characterized dealing with voltage balancing between flying capacitors and dc capacitors under practical operation, rather than ideal conditions

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6

Krug, Dietmar. "Vergleichende Untersuchungen von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für Mittelspannungsanwendungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216245.

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Die vorliegende Arbeit befasst sich mit einem detaillierten Vergleich von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für den Einsatz in Mittelspannungsanwendungen. Im Rahmen dieser Untersuchungen wird die 3-Level Neutral Point Clamped Spannungswechselrichter Schaltungstopologie (3L-NPC VSC) sowohl mit Multilevel Flying Capacitor (FLC) als auch mit Multilevel Stacked Multicell (SMC) Schaltungstopologien verglichen, wobei unter Verwendung von aktuell verfügbaren IGBT-Modulen Stromrichterausgangsspannungen von 2.3 kV, 4.16 kV und 6.6 kV betrachtet werden. Neben der

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7

Goualard, Olivier. "Utilisation de semi-conducteurs GaN basse tension pour l'intégration des convertisseurs d'énergie électrique dans le domaine aéronautique." Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/20325/1/GOUALARD_Olivier.pdf.

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Les principaux critères de comparaison des convertisseurs sont le rendement, la masse, le volume, le coût et la fiabilité. Le contexte environnemental et économique et le développement des applications nomades ouvrent à l’électronique de puissance un domaine d’application de plus en plus vaste. Mais pour imposer cette technologie, il faut sans cesse améliorer ces performances et les compromis entre celles qui sont antagonistes (augmentation du rendement et diminution de la masse par exemple…) ce qui amène naturellement à la problématique de conception et d’optimisation. Le cas spécifique de l’

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8

Oghorada, Oghenewvogaga. "Modular multilevel cascaded flying capacitor STATCOM for balanced and unbalanced load compensation." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18372/.

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Voltage and current unbalance are major problems in distribution networks, particularly with the integration of distributed generation systems. One way of mitigating these issues is by injecting negative sequence current into the distribution network using a Static Synchronous Compensator (STATCOM) which normally also regulates the voltage and power factor. The benefits of modularity and scalability offered by Modular Multilevel Cascaded Converters (MMCC) make them suitable for STATCOM application. A number of different types of MMCC may be used, classified according to the sub-module circuit

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9

Nwobu, Chigozie John. "Control of a modular multilevel flying capacitor based STATCOM for distribution systems." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15429/.

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Voltage fluctuation and power losses in the distribution line are problems in distribution networks. One method to mitigate these problems is by injecting reactive power into the network using a Static Synchronous Compensator (STATCOM). This can be used both for regulating the voltage and reducing the losses. A STATCOM is critically dependent on a grid synchronisation scheme that can accurately track the changes occurring in the grid phase and frequency. The Modular Multilevel Converter (MMC) is a promising topology for STATCOM applications because of its simple modular circuit structure that

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10

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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11

Džonlaga, Bogdan. "Contribution to the sizing of the modular multilevel converter." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS297/document.

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Le convertisseur multiniveau modulaire (MMC) est une solution appropriée pour les réseaux HVDC grâce à sa modularité, sa faible fréquence de commutation et sa tension alternative quasi-sinusoïdale. En raison de sa topologie, son modèle mathématique est assez complexe et est donc souvent simplifié au stade de la conception. En particulier, la résistance équivalente au bras R, l'inductance du bras L et le courant circulant sont souvent négligés. Toutefois, les résultats expérimentaux obtenus avec notre prototype monophasé de MMC à pont complet à six niveaux ont montré que ces hypothèses ne sont

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12

Alsolami, Mohammed Faham. "Wide Bandgap (WBG) Devices Based Switched Capacitor Multiport Multilevel SinglePhase AC/DC/AC Converter for UPS Applications." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461327268.

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13

Joca, Davi Rabelo. "TÃcnica de ModulaÃÃo para ReduÃÃo de DHT em Inversor MultinÃvel com Capacitor Flutuante de TrÃs NÃveis." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11222.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Diante da necessidade em aperfeiÃoar as tecnologias existentes para a conversÃo de energia elÃtrica em sistemas de alta potÃncia, este trabalho tem por finalidade projetar, analisar e implementar experimentalmente uma tÃcnica de modulaÃÃo com o intuito de reduzir o conteÃdo harmÃnico da tensÃo de saÃda em um inversor multinÃvel com capacitor flutuante de trÃs nÃveis. Algumas das diversas tÃcnicas de modulaÃÃo (PSPWM, LSPWM, HE-PWM e CSV-PWM) foram analisadas e implementadas no controlador digital FPGA a fim de comparar suas caracte

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14

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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15

Najmi, Vahid. "Modeling, Control and Design Considerations for Modular Multilevel Converters." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53703.

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This thesis provides insight into state-of-the-art Modular Multilevel Converters (MMC) for medium and high voltage applications. Modular Multilevel Converters have increased in interest in many industrial applications, as they offer the following advantages: modularity, scalability, reliability, distributed location of capacitors, etc. In this study, the modeling, control and design considerations of modular based multilevel converters, with an emphasis on the reliability of the converter, is carried out. Both modular multilevel converters with half-bridge and full-bridge sub-modules are evalu

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16

Nami, Alireza. "A new multilevel converter configuration for high power and high quality applications." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33216/1/Alireza_Nami_Thesis.pdf.

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The Queensland University of Technology (QUT) allows the presentation of theses for the Degree of Doctor of Philosophy in the format of published or submitted papers, where such papers have been published, accepted or submitted during the period of candidature. This thesis is composed of ten published /submitted papers and book chapters of which nine have been published and one is under review. This project is financially supported by an Australian Research Council (ARC) Discovery Grant with the aim of investigating multilevel topologies for high quality and high power applications, with speci

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17

Louganski, Konstantin. "Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27331.

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The dissertation presents a generalized average-current-mode control technique (GACMC), which is an extension of the average-current-mode control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in the form of significant reduction of the current control loop bandwidth requirement for a given line frequency in unidirectional and bidirectional boost PFC converters, and additional functionality in the form of reactive power control capability in bidirectional converters. These feature

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18

Antonopoulos, Antonios. "On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters." Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156200.

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This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. AlthoughM2Cs belong to the well-studied family of voltage-source converters (VSCs),and claim a modular structure, their control is significantly more complicatedcompared to two- or three-level VSCs, due to the fact that a much highernumb

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19

Van, der Merwe Johannes Wilhelm (Wim). "Natural balancing mechanisms in converters." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6791.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.<br>AFRIKAANSE OPSOMMING: Hierdie proefskrif handel oor die natuurlike balanserings meganismes van veelvlakkige en modulêre omsetters wat fase-skuif dragolf puls wydte modulasie gebruik. Die meganismes kan in twee hoof groepe verdeel word: ‘n swak balanserings meganisme wat afhanklik is van die oorvleuling van die skakelfunksies en ‘n sterk meganisme wat voorkom ongeag of die skakelfunksies oorvleul al dan nie. Die sterk meganisme verdeel verder in twee subgroepe, ‘n direkte oordrag van onbalans energi

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20

Alburqueque, Valdivia Marlon Jesus. "Conversor ressonante para geração de ozônio aplicado à água de processos de higienização industrial, com controle digital /." Ilha Solteira, 2019. http://hdl.handle.net/11449/181188.

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Orientador: Carlos Alberto Canesin<br>Resumo: No presente trabalho de dissertação, é analisado e desenvolvido um conversor ressonante com o objetivo de produzir ozônio, aplicado à água de processos de higienização industrial. Na atualidade, no ano de 2018, dois dos fatores de grande importância no desenvolvimento de conversores para geração de ozônio são: a eficiência energética, isto é, quanta energia é aproveitada em relação à energia total fornecida ao conversor, e a outra é a produção de ozônio fazendo uso dessa energia aproveitada. Os dois fatores não necessariamente estão relacionados, p

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21

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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22

Gulpinar, Feyzullah. "A non-conventional multilevel flying-capacitor converter topology." Thesis, 2014. http://hdl.handle.net/1805/6299.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>This research proposes state-of-the-art multilevel converter topologies and their modulation strategies, the implementation of a conventional flying-capacitor converter topology up to four-level, and a new four-level flying-capacitor H-Bridge converter confi guration. The three phase version of this proposed four-level flying-capacitor H-Bridge converter is given as well in this study. The highlighted advantages of the proposed converter are as following: (1) the same blocking voltage for all switches employed in the con fig

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23

Lien, Wei-Hsiang, and 連威翔. "Interleaved Control for Multilevel Flying Capacitor Boost-Type DC/DC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/84618735150900379634.

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碩士<br>國立交通大學<br>電控工程研究所<br>103<br>In this thesis, we construct a mathematical model and derive the transfer function for the multilevel flying capacitor converter circuit. To derive the (2+1)-level and (3+1)-level flying capacitor converter circuit as an example, we find that no matter what the order of the circuit, the transfer functions can be simplified as second order system through parameter design. Finally, according to the design specifications of the controller, we can implement the control of multilevel flying capacitor converter circuit. All the algorithms and controllers are impleme

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24

Chen, Seng-Yi, and 陳盛益. "Current Sensorless Control and Flying-Capacitor Voltage Balancing Control for Bidirectional Asymmetrical Multilevel Flying-Capacitor AC/DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4xzq3r.

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碩士<br>國立交通大學<br>電控工程研究所<br>106<br>An asymmetrical (2N+1) level flying-capacitor converter is presented in this thesis to construct a bidirectional AC/DC converter. Compared with conventional double loop control structure, the proposed control structure only requires input voltages and output voltage to achieve power factor correction amd regulate the output voltage. If there is a generated system connected to the dc bus,and the generated power is greater than the dc load, the proposed control structure must return superfluous power to the grid.Otherwise,the flying-capacitor voltage balancing l

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25

Pappu, Roshan Kumar. "Studies on Single DC Link Fed Multilevel Inverter Topologies by Cascading Flying Capacitor and Floating Capacitor Fed H-Bridges." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/3189.

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Use of multilevel inverters are inevitable in medium and high voltage drives. This is due to the fact that the multilevel inverters can produce voltages in smaller steps which will reduce the harmonic content and result in more sinusoidal voltages and currents as compared to voltages and currents from two-level inverters. Due to the device limitations, use of two-level inverters is not possible in medium and high voltage drive applications. Though multiple devices can be connected both in series and parallel to achieve two-level operation, the output voltages still suﬀer from high harmonic con

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26

Pappu, Roshan Kumar. "Studies on Single DC Link Fed Multilevel Inverter Topologies by Cascading Flying Capacitor and Floating Capacitor Fed H-Bridges." Thesis, 2014. http://hdl.handle.net/2005/3189.

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Use of multilevel inverters are inevitable in medium and high voltage drives. This is due to the fact that the multilevel inverters can produce voltages in smaller steps which will reduce the harmonic content and result in more sinusoidal voltages and currents as compared to voltages and currents from two-level inverters. Due to the device limitations, use of two-level inverters is not possible in medium and high voltage drive applications. Though multiple devices can be connected both in series and parallel to achieve two-level operation, the output voltages still suﬀer from high harmonic con

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27

Krug, Dietmar. "Vergleichende Untersuchungen von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für Mittelspannungsanwendungen." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A30069.

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Die vorliegende Arbeit befasst sich mit einem detaillierten Vergleich von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für den Einsatz in Mittelspannungsanwendungen. Im Rahmen dieser Untersuchungen wird die 3-Level Neutral Point Clamped Spannungswechselrichter Schaltungstopologie (3L-NPC VSC) sowohl mit Multilevel Flying Capacitor (FLC) als auch mit Multilevel Stacked Multicell (SMC) Schaltungstopologien verglichen, wobei unter Verwendung von aktuell verfügbaren IGBT-Modulen Stromrichterausgangsspannungen von 2.3 kV, 4.16 kV und 6.6 kV betrachtet werden. Neben de

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28

Liu, An, and 劉安. "Design of Charge-Pump Boost Converter and Flying-Capacitor Buck-Boost Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/tyyrj5.

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博士<br>國立臺北科技大學<br>電腦與通訊研究所<br>102<br>In this first part of this thesis, a new continuous conduction mode (CCM) low-ripple high-efficiency charge-pump boost converter is presented. Its components include a double voltage charge pump and a low pass LC filter. The voltage boost ratio of the positive low-ripple output voltage of the proposed converter is (1+D) where D is the duty cycle of the control switching signal waveform. Since the energy storage inductor is connected to the power source and the load at all times, the proposed converter always operates in CCM, the transient responses are fast

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29

Huang, Chun-Hao, and 黃俊豪. "Implementation of Harmonic Suppression and Reactive Power Compensation Using Flying Capacitor Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/34763722541490871637.

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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>92<br>The switching mode power supplies are widely used in the modern industry products. However, harmonic would cause system unstable, and even damage the equipment. In this thesis, a single-phase and a three-phase converter are proposed to achieve good protection from harmonic interference. The multilevel topology based on flying capacitor us used in the adopted converter to obtain harmonic elimination and reactive power compensation. The flying capacitor converter mentioned in the thesis has the advantages of a low voltage stress and light passive components. B

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30

Ming-ChiaLee and 李明嘉. "Zero-Voltage and Zero-Current Switching for Multilevel Modular Capacitor-Clamped DC-DC Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/66245999494816756250.

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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>Grouped into two main categories of switched-inductor and switched-capacitor DC-DC power converters, the switching-mode DC-DC power converter is one of the widely used power electronic circuits. With many advantages over the switched-inductor type, the switched-capacitor DC-DC power converter topologies have been widely employed. In this thesis, on the basis of existing topology a zero-voltage and zero-current switching (ZVZCS) scheme for multilevel modular capacitor-clamped DC-DC converter (MMCCC) is proposed and analyzed. The proposed ZVZCS MMCCC circuit f

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31

Viju, Nair R. "Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4026.

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Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high quality. For achieving this, it had to switch at high frequencies and also the switching is between 0 and Vdc. Also additional LC filters are required before feeding to a motor. 3-phase IM is the work horse of the industry. Several speed control techniques have been established namely the V/f control technique and for high performance, vector control is adopted. An electric drive system comprises of a rectifier, inverter

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Viju, Nair R. "Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives." Thesis, 2018. http://etd.iisc.ernet.in/2005/4005.

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Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high quality. For achieving this, it had to switch at high frequencies and also the switching is between 0 and Vdc. Also additional LC filters are required before feeding to a motor. 3-phase IM is the work horse of the industry. Several speed control techniques have been established namely the V/f control technique and for high performance, vector control is adopted. An electric drive system comprises of a rectifier, inverter

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33

Chang, Yuan-Bo, and 張元柏. "Design and Implementation of Flying-Capacitor Buck-Boost Converter with Wide Output Range utilizing PWM Technique." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/8akd94.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>100<br>The first part of this thesis is a flying-capacitor buck-boost converter with wide output range has been proposed to improve efficiency of conventional switched-capacitor converter. The proposed converter has the properties of fast response and the non-pulsating output current, which can reduce both of output voltage ripple and current stress requirement of the output capacitor. The proposed structure utilized pulse-width-modulation technique. The proposed converter can supply an output voltage with wide range which is from 1.0V to 4.5V in high accuracy whe

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34

Mathew, Jaison. "Investigation On Dodecagonal Multilevel Voltage Space Vector Structures By Cascading Flying Capacitor And Floating H-Bridge Cells For Medium Voltage IM Drives." Thesis, 2013. https://etd.iisc.ac.in/handle/2005/2600.

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In high-power electric drives, multilevel inverters are generally deployed to address issues such as electromagnetic interference, switch voltage stress and harmonic distortion. The switching frequency of the inverter is always kept low, of the order of 1KHz or even less to reduce switching losses and synchronous pulse width modulation (PWM) is used to avoid the problem of sub-harmonics and beat frequencies. This is particularly important if the switching frequency is very low. The synchronous PWM is getting popularity as its realization is very easy with digital controllers compared to analog

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Mathew, Jaison. "Investigation On Dodecagonal Multilevel Voltage Space Vector Structures By Cascading Flying Capacitor And Floating H-Bridge Cells For Medium Voltage IM Drives." Thesis, 2013. http://hdl.handle.net/2005/2600.

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In high-power electric drives, multilevel inverters are generally deployed to address issues such as electromagnetic interference, switch voltage stress and harmonic distortion. The switching frequency of the inverter is always kept low, of the order of 1KHz or even less to reduce switching losses and synchronous pulse width modulation (PWM) is used to avoid the problem of sub-harmonics and beat frequencies. This is particularly important if the switching frequency is very low. The synchronous PWM is getting popularity as its realization is very easy with digital controllers compared to analog

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36

Zhang, Xiao-Qing, and 張曉青. "Three-Level DC-DC Buck Converter with Flying Capacitor Adaptive Balancing Technique for Low Power Internet of Things Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/s8emet.

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碩士<br>國立交通大學<br>電機工程學系<br>106<br>With the popularity of ultra-high-speed Internet, the concept of Internet of things (IoT) has become a trend of development for future technology. Therefore, more and more Internet of Things portable devices and sensing applications are indispensable to human beings’ life. For the purpose of the energy saving of these products and prolonging the usage time of the internal batteries, DC-DC step-down converters are adopted to achieve the energy transfer between the energy supply and the low power integrated circuit for IoT applications. The conventional two-level

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Chu, Li-Cheng, and 朱立程. "A Three-Level Single-Inductor Triple-Output Converter with an Adjustable Flying-Capacitor Technique for Low Output Ripple and Fast Transient Response." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7zpm8m.

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碩士<br>國立交通大學<br>電控工程研究所<br>107<br>Advanced CMOS devices below 28nm allow supply voltages lower than 1V. For applications with higher input voltage (VIN) in such devices, stacked MOSFET structures with a three-level (3L) technology are commonly employed. The stacked structure can also reduce the output voltage ripple substantially. The three-level topology applies three different voltages, VIN, 1/2VIN, and VSS, to the node VX. The operation mode is determined by the duty cycle (D), i.e., the node VX swings between 1/2VIN and VSS when D < 0.5, and between 1/2VIN and VIN, otherwise (D>0.5). Compa

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Yadav, Apurv Kumar. "Investigations on Multilevel Voltage Space Vectors Generated by Stacked and Cascaded Basic Inverter Cells with Capacitor Voltage Control for Induction Motor Drives." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5451.

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Induction motor drives (IMD) require a DC-AC inverter system to obtain variable frequency operation. Generally, IMD uses conventional 2-level inverters. The conventional 2-level inverter has its pole switching between zero and DC bus voltage. Thus, the switching in 2-level inverter results in high dv/dt in the inverter pole voltage. Also, the switches in the inverter need to block a full DC link voltage which increases the switching losses. These issues with drive scheme using 2-level inverter can be addressed by using multilevel inverters (MLI). Some of the frequently used MLI topologies incl

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Banavath, Satish Naik. "A New Class of Single DC-link Fed Multilevel Inverter Topologies for Grid Connected Photovoltaic Systems with Reduced Component Count and Inherent Capacitor Balancing." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4203.

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Grid integration of photovoltaic (PV) energy sources has been mostly governed by conventional two-level voltage source inverters. These topologies have significant switching power losses, dV/dt stress and THD level at lower switching frequencies. The above issues can be solved by introducing more voltage levels through multilevel converters. Conventional multilevel converters have many issues like neutral point voltage drift in neutral point clamped (NPC) topology, floating capacitor charge balance in flying capacitor (FC) topology and large number of isolated DC sources in cascaded half bridg

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Macedo, Rui Jorge Matos. "Desenvolvimento de um inversor multinível monofásico para aplicações de qualidade de energia elétrica." Master's thesis, 2015. http://hdl.handle.net/1822/51285.

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Dissertação de mestrado integrado em Engenharia Eletrónica e de Computadores<br>A exigência na qualidade da forma de onda sintetizada pelos inversores de eletrónica de potência é cada vez maior, estando esta qualidade associada a um melhor funcionamento e a um maior tempo de vida por parte das cargas e sistemas associados aos inversores. A melhoria na qualidade das formas de onda geradas pelos inversores tem sido conseguida maioritariamente através do aumento da frequência de comutação dos semicondutores. Esta estratégia provoca perdas de comutação mais elevadas, maior stress aplicado ao

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