Дисертації з теми "AC/DC/AC Converter"
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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.
Повний текст джерелаAhmad, 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.
Повний текст джерелаWang, 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.
Повний текст джерелаPh. D.
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.
Повний текст джерелаStejskal, 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.
Повний текст джерелаYou, Keping Electrical Engineering & 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.
Повний текст джерелаChewele, Youngie Klyv. "Model predictive control of AC-to-AC converter voltage regulator." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86339.
Повний текст джерелаENGLISH 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 achieved through control of power semiconductor switching frequencies. A predictive control algorithm to achieve high power quality and limit the power losses in the high power semiconductor switches through switching frequency control is discussed for a tap switched voltage regulator. The quality of power, voltage regulator topology and the control algorithm are discussed. Simulation results of output voltage and current are shown when the control algorithm is used to control the regulator. These results are verified by practical measurements on a synchronous buck converter.
AFRIKAANSE OPSOMMING: Die ontwikkeling van vinnige en doeltreffende verwerkers, programmeerbare toestelle en hoëdrywings halfgeleiers het gelei tot 'n groter gebruik van halfgeleiers direk in die kragtoevoer pad om streng elektriese toevoer kwaliteit standaarde te bereik. Nuwe en gevorderde algoritmes word gebruik in die proses en word aan-lyn bereken om die nodige vinnige reaksie tot spanningswisselinge te gee. Verliese in hoë-spannings halfgeleiers verhoog met hoër skakel frekwensies. 'n Balans tussen die halfgeleier drywingsverliese en spanningskwalteit is behaal deur die skakel frekwensie in ag te neem in die beheer. 'n Voorspellinde-beheer algoritme om ‘n hoë toevoerkwaliteit te bereik en die drywingsverliese in die hoëdrywingshalfgeleier te beperk, deur skakel frekwensie te beheer, is bespreek vir 'n tap-geskakelde spanning reguleerder. Die toevoerkwaliteit, spanningsreguleerder topologie en die beheer algoritme word bespreek. Simulasie resultate van die uittree-spanning en stroom word getoon wanneer die beheer algoritme gebruik word om die omsetter te beheer. Hierdie resultate is deur praktiese metings op 'n sinkrone afkapper.
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.
Повний текст джерелаDaniele, 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.
Повний текст джерелаTrubitsyn, Aleksey. "High efficiency DC/AC power converter for photovoltaic applications." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60190.
Повний текст джерелаIncludes bibliographical references (p. 217-218).
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 utilized to achieve high efficiency, encompassing frequency control and inverter and cyclo-converter phase shift control. An experimental prototype is demonstrated in DC/DC conversion mode for a wide range of output voltages. The proposed control strategy is shown to allow for accurate power delivery with minimal steps taken towards correction. The prototype achieves a CEC averaged efficiency of approximately 95.1%. Guidelines for optimization are presented along with experimental results which validate the method.
by Aleksey Trubitsyn.
S.M.
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.
Повний текст джерелаA recente expectativa de crescimento da participaÃÃo da energia solar-fotovoltaica na matriz de geraÃÃo de energia elÃtrica aumentou significativamente o nÃmero de conexÃes desses sistemas à rede elÃtrica. Para que a interligaÃÃo com a rede elÃtrica convencional seja possÃvel, à indispensÃvel a utilizaÃÃo de conversores CC/CA, capazes de adequar as caracterÃsticas da energia disponibilizada pelos mÃdulos fotovoltaicos aos padrÃes da rede. Esta dissertaÃÃo apresenta uma proposta de projeto de conversor CC/CA de 2 kW para conexÃo de dois barramentos de uma microrrede, um CC em 311 V e outro CA em 220 Vrms. O conversor proposto à bidirecional e permite, quando necessÃrio, o fluxo de energia elÃtrica do barramento CA para o CC. O estudo realizado mostra, atravÃs de simulaÃÃes e de implementaÃÃo de protÃtipo em laboratÃrio, que com a aplicaÃÃo de uma estratÃgia de controle adequada à possÃvel controlar o sentido do fluxo de potÃncia do conversor, assim como modular apropriadamente a corrente que flui entre dois barramentos, o CC, alimentado por painÃis fotovoltaicos e por banco de baterias, e o barramento CA, do lado da rede elÃtrica. O protÃtipo desenvolvido apresentou rendimento de cerca de 91% e forneceu corrente elÃtrica de baixo conteÃdo harmÃnico (THDi menor que 5%).
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.
Повний текст джерелаMARCIANO, 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.
Повний текст джерелаSteckler, Pierre-Baptiste. "Contribution à la conversion AC/DC en Haute Tension." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI075.
Повний текст джерелаAs Alternating Current (AC) is well suited for most of the production, transmission, and distribution applications, its massive use is easy to understand. However, for over a century, the benefits of High Voltage Direct Current (HVDC) for long-distance energy transmission are well known. To connect both, AC/DC converters are mandatory, whose nature evolves with technological progress. After the problematic induced by HVDC on AC/DC converters is presented, this manuscript is focused on three topologies: Modular Multilevel Converter (MMC), Alternate Arm Converter (AAC) and Series Bridge Converter (SBC). They are presented, sized, analyzed thoroughly, and compared in quantitative terms, using original key performance indicators. It appears that MMC and SBC are particularly promising. The conventional control method of the MMC is then presented, and its structural properties are highlighted. A first original control law is presented, with similar performances but less complexity than the state-of-the-art. A second control law, non-linear and based on differential flatness theory, is introduced. It allows a very fast power tracking response while ensuring the global exponential stability of the system. These control laws are tested in simulation, using an average model and a detailed model with 180 sub-modules per arm. The last part is dedicated to the SBC. After a modeling step, some results regarding its structural analysis are presented, and an original control law is introduced. The essential role of the transformer for series converters like the SBC is highlighted. Finally, the performance of the proposed control law is assessed in simulation
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.
Повний текст джерелаGitau, Michael N. "Optimal PWM switching strategy for single-phase AC-DC converters." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/7205.
Повний текст джерелаJassim, 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.
Повний текст джерелаAlsolami, 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.
Повний текст джерелаIsmail, 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.
Повний текст джерелаLI, QIANG. "A SINGLE-PHASE DUAL-OUTPUT AC-DC CONVERTER WITH HIGH QUALITY INPUT WAVEFORMS." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/242.
Повний текст джерелаBulhosa, 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.
Повний текст джерелаAnderson, 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.
Повний текст джерелаWu, Yue-Lin, and 吳岳霖. "Bi-Directional AC/DC Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/454xtz.
Повний текст джерела國立臺北科技大學
電機工程系所
93
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 desired DC voltage value by balancing of instantaneous power between input and output. The developed converter improves the input power factor to approximate unity power factor and reduces the total harmonic distortion of current less than 5%. The low order harmonics are reduced and thereby decreasing the harmonic pollution. The specifications of the system include: the input voltage is AC 220 V/60 Hz, output power 1 kW, carrier frequency is 15 kHz, power factor is higher than 0.9, and the total harmonic distortion of current is less than 5%. The simulation software is developed based upon the platform of Matlab® -Simulink® and the experimental set-up is based on the dSPACE digital control board. The power devices of converter are controlled by the three-phase gating signals generated by space vector modulation technique. To reduce the number of sensor, a current estimation method is proposed to give the DC-link current. The feasibility of the proposed method is verified by simulation and experimental results.
Rout, Rashmi Ranjan, and Durga Prasad Tripathy. "AC to DC Converter Using Microcontroller." Thesis, 2009. http://ethesis.nitrkl.ac.in/301/1/AC2DC.pdf.
Повний текст джерелаWang, Sheng-Yuan, and 王聖淵. "System integration of AC-DC and DC-DC Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9a3zhg.
Повний текст джерела崑山科技大學
電子工程研究所
107
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.
LIN, TSE-YU, and 林哲宇. "AC-DC Power Converter with DC Decoupling Circuit." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/71621339711881941783.
Повний текст джерела國立高雄海洋科技大學
微電子工程研究所
105
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 passive power filter. The operation of DC decoupling circuit is simulated to be a virtual AC impedance connected to the DC output in series to suppress the AC ripple of output current for the totem-pole bridgeless boost power factor. Accordingly, the capacity of filter capacitor for the totem-pole bridgeless boost power factor is reduced such that the use of electrolytic capacitor can be avoided to prolong the service life and improve the reliability. A hardware prototype based on the control chips of digital signal processor (DSP) will be developed to verify the performance of the proposed AC-DC power converter.
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.
Повний текст джерела國立成功大學
電機工程研究所
84
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 output will distort. In order to solve this problem , the current- mode control is addressed. In the current mode control, by way of additional current feedback loop is used, the proposed system can obtain the better output profile. To verify the proposed scheme, the prototype is implemented. The experiment results are agreed with the theoretical analysis.
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.
Повний текст джерела國立臺灣大學
電機工程學系
85
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 such as requiring fewer power devices and having loweconduction losses. Then a new on-line uninterruptible power supply (UPS) structure is also presented. It consists of a dual-functional PFC substituting for an inevitable battery- voltage booster thereby simplifying the complexity of power stage. Finally an even simpler topology of power stage for UPS applications is to be shown. This new single-conversion UPS mainly consists of a minimized power converter structure which is capable of providing specified constant output voltage, phase-controlled battery charr, and input-power-factor improvement.
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.
Повний текст джерела中華大學
電機工程學系碩士班
102
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 simulation and test result are presented to validate the performances of the proposed scheme. Keywords— AC-DC-AC converter; active front-end converter; inverter; multi-carrier PWM .
LinDean-Feng and 林鼎峰. "A novel DC/AC power converter system." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55400784237530649325.
Повний текст джерела崑山科技大學
電機工程研究所
95
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 utility. Because the DC/AC inverter is opaerated in the low switching frequency, it can reduce the switching loss. Hence, the power efficiency of the entire system can be increased. Moreover, the DC capacitor between the DC/DC power converter and the DC/AC inverter can be omited.This can increase the reliability of the DC/AC power conversion interface. A prototype is developed and tested to demonstrate the performance of the proposed DC/AC power conversion interface. The experimental results show that the proposed DC/AC power conversion interface has the expected performance.
Hong-WeiDeng and 鄧弘緯. "DSP Controlled AC-DC Bidirectional Power Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/55249315633117041500.
Повний текст джерелаWang, Sing-han, and 王星翰. "Robust Repetitive Control of DC/AC Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/27477995344361845446.
Повний текст джерела國立中山大學
電機工程學系研究所
101
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 responsible for regulating output power and eliminating harmonics, while the feedback dithering modulation for switching the power transistors with reduced switching noise and the state feedback for stabilizing the converter under various load variations. The presented control and modulation schemes of the power converter are implemented on an FPGA (Field Programmable Gate Array). The experiments confirm the excellent performance and robustness of the converter, indicating a total harmonic distortion of less than 0.5% for the converter when attached to various linear or nonlinear loads.
WU, XI-ZHEN, and 吳喜楨. "Interleaved DC-AC Converter With Decoupling Circuit." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rhk4xt.
Повний текст джерела國立高雄科技大學
微電子工程系
107
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 component, so as to suppress the double-frequency ripple of DC bus for the interleaved DC-AC power converter. Accordingly, the electrolytic capacitor can be replaced by a film capacitor to improve the reliability of solar power generation system. A DSP controlled prototype is developed and test to verify the performance of interleaved DC-AC converter with DC decoupling circuit.
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.
Повний текст джерела國立臺灣科技大學
電機工程系
98
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 uses Matlab-Simulink/Simpower to simulate rectifier and inverter. The simulated results obtained serve as the basis for system implementation and performance evaluation. The high-performance and low-cost digital signal processor TMS320F2808 is used to control the power converter. An experimental system is built. The power converter supplies 780W with the current total harmonic distortion of generator of about 14.11%, while the current total harmonic distortion of single-phase output under grid connection is about 10.97%. The corresponding overall efficiency of 86.6 % is obtained using three-phase independent connections of totem-pole power converter.
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.
Повний текст джерела國立宜蘭大學
電機工程學系碩士班
97
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, on the rectifier side, and the merit of stable AC output voltage and good dynamic regulation, on the inverter side, respectively. In this thesis, the function of soft-switching is derived through zero voltage switching (ZVS) strategy, namely, switching losses of main switch is lowered and higher efficiency is achieved. Finally, computer simulation and experimental results are presented in this thesis for verification.
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.
Повний текст джерела國立臺灣科技大學
電子工程系
106
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 compared with digital control, it are some disadvantages such as not able to be using advance control technology and so on. Therefore, this thesis realize average current mode control for rectification-model and unipolar PWM control for invert-model base on digital signal processor. Finally, a high power density bi-directional converter has been achieved, the rectification-model efficiency about 98.11% and inverter-model efficiency around 96.2% in full-load.
Yeh, Y. T., and 葉有倉. "Study of Direct-Conversion-Type DC/AC Converter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/27729734261528696054.
Повний текст джерела黃士航. "Study of the improved AC/DC power converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/63103249095295520196.
Повний текст джерела-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.
Повний текст джерела國立高雄海洋科技大學
微電子工程研究所
101
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. As compared with the conventional power factor corrector, the output voltage of power factor corrector in the proposed AC-DC converter is reduced by half. Thus, the switching voltage of high-frequency power factor corrector is also reduced by half. Hence, the switching power loss of high-frequency power factor corrector is reduced and the electromagnetic interference of AC-DC power converter is alleviated. In addition, the input current of AC-DC power converter will be controlled by the high-frequency power factor corrector to be a sinusoidal waveform in phase with the input AC voltage so as to attain unity power factor. The buck power converter and the forward power converter are applied to integrate the output voltages of power factor correctors to an output voltage supplying to the load. A prototype with a digital signal processor based controller is developed and tested to verify the performance of the proposed AC-DC power converter.
HSU, JUI-PO, and 徐瑞柏. "Three-phase Impedance-Source Bidirectional AC/DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n5b7ft.
Повний текст джерела國立臺灣科技大學
電子工程系
105
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 output voltage can be either higher or lower than the input. Besides, eliminating the potential hazard of short-through or open-circuit in voltage-source or current-source circuits, Z-source circuit possesses better reliability. In one of the two operation modes, the auxiliary switch can be passively mode, resulting an easier control mechanism. The control algorithm for a Z-source can be an extension based on convention control algorithm. This thesis implements a three-phase Z-source AC-DC converter with input voltage of 150 V and 200 V, output voltage of 110 Vrms and 500 W output power. According to the test results, it is confirmed that the effect can be buck/boost in single-stage structure.
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.
Повний текст джерелаThere 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 very feasible. To reduce the loss and increase e ciency, the thesis presents a novel design with reduced number of switches. The scope of this thesis is not limited to the dc-dc converter only, the converter to supply three phase ac loads from a single dc source is also presented. This discussion includes an improved fault tolerant configuration of the inverter part. The generated waveforms from the simulations are included as a demonstration of satisfactory results.
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.
Повний текст джерела國立雲林科技大學
電機工程技術研究所
88
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 power can be directly delivered to the three-phase induction motor. Thus instead of the bulky electrolytic capacitor in the dc link, small capacitors can be used. A quasi-parallel resonant DC link circuit can be applied to the induction motor system to implement the soft-switching inverter. In all signal processings, TI TMS320C240 digital signal processor is regarded as the heart of the system to complete the related software. From the results of experiments, it is proved that it can achieve the power factor correction and the stable AC/DC/AC operation even with the smaller capacitor.
Luo, You Gang, and 羅有綱. "High-performance AC/DC converters." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/85254283529982708794.
Повний текст джерелаChen, Hsin-Hon, and 陳信宏. "Digital power factor correction circuit of AC/DC converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/67968339218317731054.
Повний текст джерела國立清華大學
電子工程研究所
92
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 scholars to study and implementation. In the other word, how to use energy efficiently will be an aim to power electronics. PFC circuits play an important role to improve the efficiency and to minimize the power pollution .When people pay attention to environmental protection, some people also care about the pollution about power system. Many countries in Europe and North America make some standards to constrain some power products, IEEE 519 and IEC 1000-3-6 for example. PFC circuit can achieve high power correction factor and minimize the total harmonic distortion, so nowadays many powerproducts include the PFC function in them. Many IC design concepts base on digital and analog circuits , these two types both have advantages and disadvantages. The PFC circuits are also divided into two types---digital and analog. This thesis will compare these two types, and combine some advantages of digital and analog circuits to realize the PFC circuit. Because the majority of the PFC circuit is digital, it still called ‘digital PFC circuit’. Finally, this work uses TSMC CMOS 0.35 um technology to simulate PFC circuit, then the power factor achieves 0.999 and total harmonic distortion achieves 2.09% when full loading.
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.
Повний текст джерела遠東科技大學
電機工程研究所
101
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. Finally, AC input 90 ~ 264 V , DC output 39 ~ 46 V and output power 65 W is implemented to verify the performance of the proposed converter.
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.
Повний текст джерела國立高雄海洋科技大學
微電子工程研究所
102
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 dual-boost power converter will generate a four-level DC voltage at the output dc terminals of diode rectifier. Accordingly, the voltage at the input AC terminals of diode rectifier is an AC voltage with seven levels. Since the level of the input AC voltage is increased, the switching power loss is reduced. In addition, the input filter and the electromagnetic interference (EMI) filter are reduced. The input current of seven-level AC-DC power converter is controlled to be sinusoidal and in phase with the utility voltage, it performs the harmonic suppression and unity power factor. Only two power electronic switches are used in the seven-level AC-DC power converter, both the power circuit and the control circuit are simplified. The dual-input buck power converter is used to regulate the output voltages of dual-boost power converter with multiple relationships and generate an output power to charge the battery set. A hardware prototype based on the control chips of digital signal processor (DSP) and complex programmable logic device (CPLD) will be developed to verify the performance of the proposed seven-level AC-DC power converter based battery charger.
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.
Повний текст джерела義守大學
電機工程學系碩士在職專班
102
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 at the input line. The detailed circuit operations and analysis are provided. A prototype 60-W LED driver was built and tested. Experimental results show that the switching losses can be effectively reduced by operating the active switches at ZVS. The measured power factor and circuit efficiency are as high as 0.99 and 95.6%, respectively.
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.
Повний текст джерелаPullaguram, Deepak Reddy. "Distributed control strategies for AC and DC microgrids." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7925.
Повний текст джерелаMahakhuda, 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.
Повний текст джерела