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Dissertations / Theses on the topic 'AC/DC/AC Converter'

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Published: 31 August 2024
Last updated: 31 July 2025

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1

Mayes, Peter Richard. "A novel AC/DC bidirectional power converter." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239439.

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2

Ahmad, Khan Naveed. "Power Loss Modeling of Isolated AC/DC Converter." Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109717.

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Several research activities at KTH are carried out related to Isolated AC/DC converters in order to improve the design and efficiency. Concerning the improvement in the mentioned constraints, losses of the elements in the prototype converter are modeled in this thesis work. The obtained loss model is capable of calculating the losses under different circumstances. The individual contribution of losses for each element at different conditions can be obtained, which is further useful in improving the design and therefore, efficiency. The losses in different elements of the converter, including p
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3

Wang, Kunrong. "High-Frequency Quasi-Single-Stage (QSS) Isolated AC-DC and DC-AC Power Conversion." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/29394.

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The generic concept of quasi-single-stage (QSS) power conversion topology for ac-dc rectification and dc-ac inversion is proposed. The topology is reached by direct cascading and synchronized switching of two variety of buck or two variety of boost switching networks. The family of QSS power converters feature single-stage power processing without a dc-link low-pass filter, a unidirectional pulsating dc-link voltage, soft-switching capability with minimal extra commutation circuitry, simple PWM control, and high efficiency and reliability. A new soft-switched single-phase QSS bi-directional i
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4

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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5

Stejskal, Jiří. "Měnič 12V DC/230V AC." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218761.

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This diploma thesis describes particular parts of power inverter such as gate driver, DSC, LC filter, low power supply, DC/DC converter and four-quadrant bridge and manner of its control by digital signal controller. Inverter is designated for generating of a mobile artificial electric grid (for example in a car).
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6

You, Keping Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "A new bidirectional AC-DC converter using matrix converter and Z-source converter topologies." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/37450.

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This thesis proposes a new bidirectional three-phase AC-DC power converter using matrix converter and Z-source inverter topologies. Advantages of the AC-DC matrix converter are the inherently controllable power factor, the tight DC voltage regulation, the wide bandwidth with quick response to load variation, the single-stage buck-voltage AC-to-DC power conversion; advantages of the z-source inverter are the increased reliability by allowing the shoot-through between upper and lower power switches of one inverter leg, insensitivity to DC bus voltage due to the extra freedom of controlling DC-li
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7

Chewele, Youngie Klyv. "Model predictive control of AC-to-AC converter voltage regulator." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86339.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The development of fast and efficient processors, programmable devices and high power semiconductors has led to the increased use of semiconductors directly in the power supply path in order to achieve strict power quality standards. New and advanced algorithms are used in the process and calculated on-line to bring about the required fast response to voltage variations. Losses in high voltage semiconductors increase with increased operating frequencies. A balance between semiconductor power losses and power quality is achiev
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8

Mino, Kazuaki. "Novel hybrid unidirectional three-phase AC-DC converter systems /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18185.

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9

Daniele, Matteo. "A single-stage power factor corrected AC/DC converter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0018/MQ39474.pdf.

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10

Trubitsyn, Aleksey. "High efficiency DC/AC power converter for photovoltaic applications." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60190.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.<br>Includes bibliographical references (p. 217-218).<br>This thesis presents the development of a microinverter for single-phase photovoltaic applications that is suitable for conversion from low-voltage (25-40V) DC to high voltage AC (e.g. 240VAC,RMS). The circuit topology is based on a full-bridge series resonant inverter, a high-frequency transformer, and a novel half-wave cyclo-converter. The operational characteristics are analyzed, and a multidimensional control technique is
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11

Santos, Heron Alves dos. "Design of a controlled single-phase ac-dc converter for interconnection of DC and AC buses of a microgrid." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12977.

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The recent growth expectation of the participation of solar-photovoltaic energy sources in the power generation matrix has significantly increased the number of grid-connected systems. For connection to power grid, it is essential to use a dc-ac converter, which is able to suit the characteristics of the power provided by the photovoltaic modules to grid parameters. This dissertation presents a project proposal of a 2 kW single phase dc-ac converter for connecting a 311 V dc bus to a 220 Vrms ac bus of a microgrid. The proposed converter is bidirectional and allows, when necessary, the power f
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12

Shen, Jian. "GTO Pulsed Width Modulated (PWM) converter for railway traction applications." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308484.

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13

MARCIANO, Daniele. "Analysis of Multistage DC/AC converter based on Pulsating DC link principle." Doctoral thesis, Università degli studi di Cassino, 2022. https://hdl.handle.net/11580/90998.

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Nowadays the different application fields of the Power Electronics and the industries are demanding incessant enhancements of the features of power converter as efficiency, reliability and power density. To answer to this request, the researchers are pushing the limits of these features thanks to the growing use of Wide band-gap (WBG) power devices, new improvements in the field of power magnetics and new topologies of converter. The aim of this thesis is present the results of complete analysis of new topology of insulated DC/AC converter, based on the Pulsating DC link principle. A prelimina
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14

Steckler, Pierre-Baptiste. "Contribution à la conversion AC/DC en Haute Tension." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI075.

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Le courant alternatif (AC) se prêtant bien à la majorité des problématiques de production, de transport et de distribution de l'électricité, on comprend qu'il soit massivement utilisé. Cependant, depuis plus d'un siècle, les bénéfices du courant continu haute tension (HVDC, pour High Voltage Direct Current) pour les longues distances sont bien connus. Aux interfaces, des convertisseurs AC/DC sont requis, leur composition évoluant au fil des avancées technologiques. Après avoir présenté les spécificités du HVDC et les contraintes qu'il introduit sur les convertisseurs AC/DC, ce manuscrit se foc
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15

Yang, Xiaoguang Miu Karen Nan. "Unbalanced power converter modeling for AC/DC power distribution systems /." Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1231.

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16

Gitau, Michael N. "Optimal PWM switching strategy for single-phase AC-DC converters." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/7205.

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The thesis describes an optimal selective harmonic elimination strategy suitable for singlephase AC-DC converter-fed traction drives. The objective is to eliminate low-order supply current harmonics, including those injected into the supply due to load-side current ripple. Other advantages that the switching strategy has to offer over phase-control include improved supply power factor, reduced VA consumption for a given demand speed and load, reduced torque and speed ripple and smaller armature circuit smoothing inductance. The effect of field current boost on the dynamic response of the drive
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17

Jassim, Bassim M. H. "Active current sharing control schemes for parallel connected AC/DC/AC converters." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/3086.

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The parallel operation of voltage fed converters can be used in many applications, such as aircraft, aerospace, and wind turbines, to increase the current handling capability, system efficiency, flexibility, and reliability through providing redundancy. Also, the maintenance of low power parallel connected units is lower than one high power unit. Significant performance improvement can be attained with parallel converters employing interleaving techniques where small passive components can be used due to harmonic cancellation. In spite of the advantages offered by parallel connected converters
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18

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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19

Ismail, Nasser. "A single stage full bridge power factor corrected AC/DC converter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq26004.pdf.

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20

LI, QIANG. "A SINGLE-PHASE DUAL-OUTPUT AC-DC CONVERTER WITH HIGH QUALITY INPUT WAVEFORMS." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/242.

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A single-phase, buck-boost based, dual-output AC-DC converter is studied in this thesis. The converter has two DC outputs with opposite polarities, which share the same ground with the input power line. The power stage performance, including the input filter, is studied and procedure to select power components is given. The circuit model is analyzed to develop appropriate control. Zerocrossing distortion of the source input current is addressed and a solution is proposed. Experimental results are satisfactory in that a high power factor line current results for steady-state operation.
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21

Bulhosa, João Paulo Rodrigues. "Controlo de um conversor AC-DC-AC para turbinas eólicas baseadas no PMSG." Master's thesis, Instituto Politécnico de Bragança, Escola Superior de Tecnologia e de Gestão, 2009. http://hdl.handle.net/10198/2062.

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A dissertação teve como objectivo o estudo e implementação do controlo de um conversor AC-DC-AC, constituído por um conversor DC/DC elevador e um inversor de tensão monofásico, para efectuar a ligação à rede de turbinas eólicas baseadas no gerador síncrono de ímanes permanentes. O controlo global do conversor AC-DC-AC seguiu uma estratégia na qual o controlo do conversor elevador e do inversor de tensão monofásico é implementado de modo independente. O primeiro visa maximizar a potência extraída da turbina através da implementação de um algoritmo de seguimento do ponto de potência máxima (MPP
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22

Anderson, Glenn Warwick Jan. "Hybrid simulation of AC-DC power systems." Thesis, University of Canterbury. Electrical and Computer Engineering, 1995. http://hdl.handle.net/10092/1176.

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Transient stability studies are primarily concerned with the generator response of ac power systems and use only steady state type equations to model HVdc converter terminals. These equations are adequate for small disturbances at the converter terminals but cannot accurately represent a converters behaviour during, and through its recovery of, a significant transient disturbance. A detailed three phase electromagnetic analysis is necessary to describe the converters correct behaviour. This thesis describes an accurate and effective hybrid method combining these two types of studies, fo
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23

Wu, Yue-Lin, and 吳岳霖. "Bi-Directional AC/DC Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/454xtz.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>93<br>The thesis is dedicated to the design and implementation the bi-directional AC/DC converters for the front-end of inverter. The developed converter is modulated by space vector modulation and the related controlled quantities are referred to synchronous frame. The controller consists of multiple control loops, which include inner current loop and external voltage loop to achieve fast response. The inner loop is based upon direct current control and the voltage decouple to achieve current tracking, and the external loop controls the output voltage to follow the
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24

Rout, Rashmi Ranjan, and Durga Prasad Tripathy. "AC to DC Converter Using Microcontroller." Thesis, 2009. http://ethesis.nitrkl.ac.in/301/1/AC2DC.pdf.

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The aim of the project is to obtain a controlled DC output from a standard single phase 230V, 50Hz power supply. For this we first rectified the ac voltage using four diodes. Then the rectified DC voltage is used to get controlled DC voltage output using an IGBT with a pulse of variable duty cycle, generated by a microcontroller. By varying the duty cycle of the square wave pulse the average output DC voltage is regulated. For user interfacing, a knob is used to set the required voltage. This is achieved by converting the analog signal input, from the knob, to digital signal by using the inter
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25

Wang, Sheng-Yuan, and 王聖淵. "System integration of AC-DC and DC-DC Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9a3zhg.

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碩士<br>崑山科技大學<br>電子工程研究所<br>107<br>As the trend of electric vehicles is becoming clearer, the charging system is also charged by AC to DC. The main purpose of this thesis is to develop and discuss the application of an AC-DC and DC-DC integration. Can be applied to charging systems or other related consumer electronics. DC-DC Converter developed a system with DC48V, switching frequency of 60kHz~65kHz and power of 60W in the form of Flyback. And with AC-DC system.
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26

LIN, TSE-YU, and 林哲宇. "AC-DC Power Converter with DC Decoupling Circuit." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/71621339711881941783.

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碩士<br>國立高雄海洋科技大學<br>微電子工程研究所<br>105<br>AC-DC power converters have been widely used in the applications of electronic equipment for supplying electric power and battery charger. In this thesis, a AC-DC power converter, composed of a totem-pole bridgeless boost power factor corrector and a DC decoupling circuit, is developed. By controlling the power electronics, the input current of totem-pole bridgeless boost power factor corrector will be sinusoidal and in phase with the utility voltage to perform the unity power factor. The DC decoupling circuit is composed of a power-electronic arm and a p
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27

Jan, CHih-Chiang, and 詹智強. "Study of Directly-Converted-Type DC/AC and AC/AC converters for UPS." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/66199330272462907879.

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碩士<br>國立成功大學<br>電機工程研究所<br>84<br>In this thesis, a directly-converted-type dc/ac and ac/ac converter topology for UPS is proposed. Using the technique of the Buck-Boost circuit, a reliable sinusoidal ac output is presented at load end for the case of ac or dc input. Voltage- mode and current-mode control methods are investigated to deal with various loads and sources. Good output characteristics are achieved in the voltage-mode control for dc input. However, when ac input is applied, the ou
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28

Ho, Wen-Jung, and 何文榕. "Optimizing Single-Phase AC/DC/AC Converter with PFC-Preregulator Improvement." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/30363357595270470618.

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博士<br>國立臺灣大學<br>電機工程學系<br>85<br>The research of the dissertation focuses on the topologies of single-phase AC/DC/AC converter with pre-staged power-factor- correction (PFC). In the beginning, new topologies for PFC- prestaged AC/DC/AC converter are presented. The introduction of common-neutral connection simplifies the conventional connection of AC/DC/AC structure, and gives new topologies that still have good performance, conform with output safety regulations and have other advantages suc
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29

Su, Hsin-Ping, and 蘇心平. "A Multi-carrier PWM for AC-DC-AC Converter Without DC Link Electrolytic Capacitor." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/70517992308602431561.

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碩士<br>中華大學<br>電機工程學系碩士班<br>102<br>Abstract This study proposes a multi-carrier pulse width modulation (PWM) for AC-DC-AC converter without DC link electrolytic capacitor. The AC-DC-AC converter consists of an AC-DC active front-end converter, a DC-AC voltage source inverter, and a 20uF ceramic capacitor in DC link. The DC bus voltage controller with load compensator is utilized to maintain the voltage of the DC link capacitor at designed value. Furthermore, the multi-carrier PWM is utilized to reduce the common-mode voltage (CMV) of AC-DC active front-end converter and DC-AC inverter. The simu
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30

LinDean-Feng and 林鼎峰. "A novel DC/AC power converter system." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55400784237530649325.

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碩士<br>崑山科技大學<br>電機工程研究所<br>95<br>The cost of fossil energy was rsien up, recently. This has promoted the importance of the renewable energy. A small capacity DC/AC power conversion interface for renewable energy will be developed in this thesis. This power conversion interface including a DC/DC power converter and a DC/AC power converter. The PWM modualtion strategy is used in the DC/DC power converter to generate a rectifier sinusoidal current. The DC/AC inverter, opaerated in the low switching frequency, converts the the rectifier sinusoidal current to a sinuoidal current and feeds to the ut
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31

Hong-WeiDeng and 鄧弘緯. "DSP Controlled AC-DC Bidirectional Power Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/55249315633117041500.

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32

Wang, Sing-han, and 王星翰. "Robust Repetitive Control of DC/AC Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27477995344361845446.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>This thesis applies digital repetitive control to a single-phase DC-to-AC converter, with some proposed designs to improve stability and enhance performance of the converter under various load variations. A practical DC-to-AC converter is required to convert DC power to stable AC power with low harmonic distortion when attached to various linear or nonlinear loads. This thesis combines repetitive control with feedback dithering modulation and optimal state feedback to control the converter. The repetitive control is responsib
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33

WU, XI-ZHEN, and 吳喜楨. "Interleaved DC-AC Converter With Decoupling Circuit." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rhk4xt.

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碩士<br>國立高雄科技大學<br>微電子工程系<br>107<br>DC-AC power converters have been widely used in solar power generation systems. This paper presents an interleaved DC-AC converter with a DC decoupling circuit. It consists of an interleaved DC-AC power converter and a decoupling circuit. The interleaved DC-AC power converter is controlled to convert the DC power to AC power and generate a sinusoidal current in phase with the utility voltage. The decoupling circuit is composed of two power electronic switches and passive filters. The decoupling circuit is used to decouple the DC component and double-frequency
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34

Chen, Hsin-hsuan, and 陳信炫. "Development of AC-DC-AC Power Converter for Small Wind Power Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/14261835836303093220.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>98<br>This thesis presents the analysis and design of power converters for small wind generators. The system consists of three-phase permanent-magnet synchronous generator, rectifier and inverter, which can transfer the generator power from varying-frequency and varying-voltage to single-phase for grid connection. The ac-dc power converter uses three-phase independent connections of totem-pole converter to keep dc-link voltage constant and exercise maximum power-point tracking. The single-phase inverter can provide the generator power to grid. The proposed system use
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35

Li, Cheng-Chang, and 李承璋. "Study and Realization of a DSP-Based High-Performance AC/DC/AC Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/19980591023974352170.

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碩士<br>國立宜蘭大學<br>電機工程學系碩士班<br>97<br>A digital signal processor (DSP) -based high performance AC/DC/AC converter is studied and realized in this thesis, whose main contribution is the replacement of the former analog controller by digital system, which is trying to implement the simplicity, less interference noise and great reduction of system scale of the control circuit. Besides, the proposed digital controller can achieve the technique of average-current mode control and sinusoidal pulse width modulation (SPWM), which can retain the merit of high power factor and low input current harmonic, o
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36

Liao, Di, and 廖荻. "Study and Implement of a Bi-Directional Bridgeless AC-Switch AC/DC Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f2n2zt.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>This thesis aims to study and design an output power 750 W, AC-side 230 V, DC-side 750 V bi-directional high efficiency and high power density for power converter of green energy system. For wider range of applications, this thesis implements synchronous rectification to achieve bi-directional power transference and the bridgeless topology for higher rectification-model efficiency, the inverter-model applied is a T-type inverter topology. On other the hand, the digital control used to replace analog control, the analog control is economical and simple but comp
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37

Yeh, Y. T., and 葉有倉. "Study of Direct-Conversion-Type DC/AC Converter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/27729734261528696054.

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38

黃士航. "Study of the improved AC/DC power converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/63103249095295520196.

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39

-Yi, Jhang Jian Jyun, and 張簡駿逸. "AC-DC Power Converter with Unity Power Factor." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/42464490460403641181.

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碩士<br>國立高雄海洋科技大學<br>微電子工程研究所<br>101<br>In this paper, an AC-DC power converter with unity power factor is proposed. The proposed AC-DC power converter is configured by two cascade–connected power factor correctors, a buck power converter and a forward power converter. One of power factor correctors is switched in high-frequency pulse-width modulation, and the other one is switched in the frequency the that of input AC voltage. Accordingly, the cascade operation of two power factor correctors can generate a five-level AC voltage in the input terminal so as to reduce the capacity of input filter
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40

HSU, JUI-PO, and 徐瑞柏. "Three-phase Impedance-Source Bidirectional AC/DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n5b7ft.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>In this thesis, the topology of three-phase AC-DC converters is studied. An impedance source (Z-source) topology together with traditional three-phase six-switch circuit to achieve the buck/boost function in single-stage structure. Traditional voltage source or current source inverter has the limitation that output voltage can only be less than or greater than the input voltage. The impedance source topology has combination of inductors, capacitors, and one auxiliary switch. The input port is neither a voltage source nor a current source. Therefore, the outpu
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41

Mallik, Dhara I. "Design of isolated DC-DC and DC-DC-AC converters with reduced number of power switches." Thesis, 2017. https://doi.org/10.7912/C2H652.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>There are various types of power electronic converters available in recent days. In some applications (e.g. PC power supply), it is required to supply more than one load from a single power supply. One of the main challenges while designing a power converter is to increase its e ciency especially when the number of power switches employed is relatively large. While several loads are supplied from a single source, if the power loss in the switches cannot be reduced, then the expected utilization of using a single source is not v
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42

Liaw, Yisheu, and 廖怡咰. "Analysis and Design of Digital Signal Processor Applied to the AC/DC/AC Converter." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/45711160642468305694.

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碩士<br>國立雲林科技大學<br>電機工程技術研究所<br>88<br>A current control technique based on the space vector modulation for a three-phase rectifier is adopted to the AC/DC/AC system. This control technique calculated the voltage in front of the switches of rectifier. Then by the space vector modulation, the rectifier can correct the power factor. The vector control method is used to construct the driving system of the induction motor. The optimal conduction time of the AC/DC/AC converter is achieved by the optimal voltage vector and time selector. Because the two converters are active in the same time, the powe
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Luo, You Gang, and 羅有綱. "High-performance AC/DC converters." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/85254283529982708794.

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Chen, Hsin-Hon, and 陳信宏. "Digital power factor correction circuit of AC/DC converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/67968339218317731054.

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碩士<br>國立清華大學<br>電子工程研究所<br>92<br>This thesis introduces some type of the power converters and themechanism of power factor correction (PFC) circuits; and present the study and implementation of digital power factor correction circuit that uses TSMCCMOS 0.35 um technology to realize PFC circuit. With the growing of VLSI technology, the development of industry and electronic products all need more reliable, cheap and intelligent power control system. How to control several watts even tens of kilowatts power transformation without consuming too much energy during transforming is the topic for
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Cheng, Jen-Chun, and 鄭任鈞. "Implementation of the AC-DC Converter for LED Driver." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/5k47vp.

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碩士<br>遠東科技大學<br>電機工程研究所<br>101<br>In this thesis, a AC-DC converter is proposed applied to the LED. The converter increase the inductance of the transformer secondary side as energy storage. Energy does not need the third winding transformer remanence, recovery to output. The pulse width modulation control strategy is used to control the active switches. This circuit Power factor correction is operated in discontinous coduction mode. Can be achieved near unity power factor and low input current total harmonic distortion. The operating principle and steady-state analysis are discussed in detail
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Han, Chia-Chung, and 韓家仲. "Seven-Level AC-DC Power Converter Based Battery Charger." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34384411792801448041.

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碩士<br>國立高雄海洋科技大學<br>微電子工程研究所<br>102<br>AC-DC power conversion has been widely used in the applications of electronic equipment for supplying electric power and battery charger. In this thesis, a seven-level AC-DC power converter based battery charger, composed of a seven-level AC-DC power converter and a dual-input buck power converter, is developed. The seven-level AC-DC power converter is configured by a diode rectifier and a dual-boost power converter. The output voltages of dual-boost power converter are controlled to be multiple relationships. By controlling the power electronics, the dua
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Yang, Po-En, and 楊柏恩. "A High-performance AC/DC Converter for LED Lighting." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11575557210736684859.

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碩士<br>義守大學<br>電機工程學系碩士在職專班<br>102<br>This thesis proposes a novel LED driver consisting of a boost converter and a buck converter. Each converter adopts a power MOSFET as the active switch. Without useing any lossless snubber circuit and/or auxiliary switch, both active switches can operate at zero-voltage switching (ZVS) on by freewheeling the inductor currents of the converters to flow through the intrinsic diodes of the MOSFETs. The boost converter is operated at discontinuous-conduction mode (DCM) to perform the function of power-factor correction (PFC) to ensure almost unity power factor
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Agrawal, Ashish, Srikant Kayal, and Bhaskar Munshi. "Study of Wind Turbine Driven Doubly Fed Induction Generator (DFIG) Using AC/DC/AC Converter." Thesis, 2009. http://ethesis.nitrkl.ac.in/311/1/studyofDFIG_pdf.pdf.

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In recent years, wind energy has become one of the most important and promising sources of renewable energy, which demands additional transmission capacity and better means of maintaining system reliability. The evolution of technology related to wind systems industry leaded to the development of a generation of variable speed wind turbines that present many advantages compared to the fixed speed wind turbines. These wind energy conversion systems are connected to the grid through Voltage Source Converters (VSC) to make variable speed operation possible. The studied system here is a variable s
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Pullaguram, Deepak Reddy. "Distributed control strategies for AC and DC microgrids." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7925.

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Mahakhuda, R. K. "Application of sliding mode controller in DC/AC and DC-DC power converter system." Thesis, 2014. http://ethesis.nitrkl.ac.in/5606/1/E-58.pdf.

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Maintaining good voltage regulation at output and having fast dynamic response under sudden load fluctuation are extremely important in distributed generation (DG) as well as uninterrupted power supply (UPS) systems. This work presents a fixed frequency hysteresis current (FFHC) controller, which is implemented on the basis of sliding mode control (SMC) technique and fixed frequency current controller with a hysteresis band. The controller have the benefit of hysteretic current control having fast dynamic responses and reduces the disadvantages of the variable switching frequency. For this wor
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