Dissertations / Theses on the topic 'Single-phase dc/ac converter'
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Gitau, Michael N. "Optimal PWM switching strategy for single-phase AC-DC converters." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/7205.
Full textLI, QIANG. "A SINGLE-PHASE DUAL-OUTPUT AC-DC CONVERTER WITH HIGH QUALITY INPUT WAVEFORMS." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/242.
Full textSantos, 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.
Full textA 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%).
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.
Full textPh. D.
Shams, Arasto. "Sensor based measurements of a single phase AC/DC converter to estimate lifetime." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-282878.
Full textUnderhåll av kraftelektronik är ett intressant område för ett större systems helhet. Orsaken är att det kraftelektroniska systemets funktionalitet kan påverka allt som är kopplat mot det och ge upphov till grövre problem för systemet i helhet. Generellt är underhåll avsystem,som är kritiska att vara funktionella,ett växande forskningsområde somutvecklas. Inom kraftelektroniken krävs det mer forskninggällandesystemets hälsa och vad som orsakaratt systemets funktionalitet misslyckas. Detta examensarbete syftar tillatt efterforska vad som orsakar att kraftelektroniska systemet misslyckas och hur dessa orsaker kan förhindras.Utöver detta är ett sensorbaserat system utvecklat för att samla data som anses vara relevanta för livslängden av systemet och dess degradering. Dataär behandlad och analyserad med estimeringmetoder relevanta för forskningen.
Babayan-Aghan, Vahik. "Investigation into different types of single-phase AC/DC convertors." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/7063.
Full textLouganski, 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.
Full textA closed-loop dynamic model for the current control loop of the boost PFC converter with the ACMC has been developed. The model explains the structure of the converter input admittance, the current phase lead phenomenon, and lays the groundwork for development of the GACMC. The leading phase admittance cancellation (LPAC) principle has been proposed to completely eliminate the current phase lead phenomenon and, consequently, the zero-crossing distortion in unidirectional converters. The LPAC technique has been adapted for active compensation of the input filter capacitor current in bidirectional boost PFC converters.
The dynamic model of the current control loop for bidirectional boost PFC converters was augmented to include a reactive power controller. The proposed control strategy enables the converter to process reactive power and, thus, be used as a reactive power compensator, independently of the converter operation as an ac-dc converter.
Multiple realizations of the reactive power controller have been identified and examined in a systematic way, along with their merits and limitations, including susceptibility to the ac line noise. Frequency response characteristics of reactive elements emulated by means of these realizations have been described.
Theoretical principles and practical solutions developed in this dissertation have been experimentally verified using unidirectional and bidirectional converter prototypes. Experimental results demonstrated validity of the theory and proposed practical implementations of the GACMC.
Ph. D.
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.
Full textMino, 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.
Full textWoods, Joseph. "The parallel connection of single phase DC to AC power converters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39102.pdf.
Full textIsmail, 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.
Full textAlam, Md Muntasir Ul. "Investigation of bridgeless single-phase solutions for ac-dc power factor corrected converters." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62355.
Full textApplied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
Chen, Fang. "Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77532.
Full textPh. D.
Musavi, Fariborz. "Investigation of high performance single-phase solutions for AC-DC power factor corrected boost converters." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/35082.
Full textDanko, Donald. "Configurable Frequency and Voltage Three Phase Power Supply." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1559166225004371.
Full textRashid, Tariq. "Perturbation model based analysis of a three phase PWM ac-dc power converter." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336819.
Full textTooth, Daniel John. "The behaviour and analysis of a three-phase AC-DC step-down unity power factor converter." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/594.
Full textRustom, Khalid. "STEADY STATE AND DYNAMIC ANALYSIS AND OPTIMIZATION OF SINGLE-STAGE POWER FACTOR CORRECTION CONVERTERS." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2216.
Full textPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
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.
Full text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.
Dharmarajan, Vimala. "Three-level soft-switched DC-to-DC converter and single-phase, single-stage, three-level AC-to-DC converter." Thesis, 2006. http://hdl.handle.net/1828/2335.
Full textHung, Ming-Fu, and 洪銘福. "The Design and Application of the Three Phase AC-DC Converter Simplified to the Single Phase DC-DC Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/cc5m7n.
Full text國立臺北科技大學
電機工程系研究所
97
Three-phase AC-DC converters are gradually and widely being used in industry mainly for the improvement of the quality of the input current and adjust the magnitude of output voltage. By using the switch, the voltage and current on the input side are adjusted to be in-phase. As more and more types of three-phase AC-DC circuit topologies have been invented, usually the three-phase AC-DC converters are analyzed through the D-Q transformation. In the D-Q domain, the State Space equation are mutually coupled, thus the design of the control system is still difficult and complicated. In references, usually only the small signal equivalent model, the transfer function and the controller design of single-phase DC-DC converters are described in detail. However, the study of those for the three-phase AC-DC converter has not been dealt with in depth. The object of this paper is to propose a simplified method for modeling the three-phase AC-DC converters in order to extensively apply the knowledge of single-phase DC-DC converters to the simplified modeling of three-phase AC-DC converters. The paper shows that after the simplification is completed, the principles which work for single-phase DC-DC converter are able to be applied to the simplification model of three-phase AC-DC converter as well. The paper would be a helpful reference to people who need to design and analyze the control systems of the three-phase AC-DC converter.
Liaw, Gin Tu, and 廖金塗. "MODELING AND IMPLEMENTATION OF A SINGLE PHASE AC/DC CONVERTER." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/63600535296434779074.
Full textShie, Wei-Meng, and 謝唯盟. "A Novel Single-Phase Multilevel Current Source DC-AC Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/10465687388776835280.
Full text國立清華大學
電機工程學系
92
Multilevel converters are usually used in high power applications to reduce the voltage and current stress of the active switches and meanwhile to achieve better output waveform quality. Recent researches are basically focused on the voltage source multilevel dc to ac converters. Concerning the multilevel current source dc to ac converters, only very few papers are available in the literature. In view of this, the main purpose of this thesis is focused to the study of single-phase current source dc to ac converters. The contributions of this thesis may be summarized as follows. First, a novel configuration of single-phase multilevel current source dc to ac converter is proposed to achieve better performance as compared with that of the existing literature. Second, operation principles of both five-level and seven-level configurations are presented. It turns out that the proposed multilevel configuration can be extended to ( ) level as well as three-phase system easily. Third, a simple carrier signal synthesis technique is proposed to obviate using many logic gates for getting the desired carrier signal. Hence, by comparing the modulating signal with the carrier signal, one can obtain the switching signal easily and more reliably. Fourth, the proposed multilevel converter cannot only be used to generate clean sinusoidal output current but also can be used to track other nonsinusoidal command signals. In other words, it can be used as a low frequency power amplifier. Finally, a prototype is also constructed and experimental results are presented to verify the feasibility of the proposed converter.
HU, SHU-YU, and 胡書瑜. "Realization of Three-Phase AC-to-DC Converter with Single-Phase Modules." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9q962x.
Full text南臺科技大學
電機工程系
106
This thesis presents a study of three-phase AC-DC conversion using three sets of single-cycle controlled based single-phase AC-DC converters, and each output is cascaded by a full-bridge DC-DC converter. The proposed input side includes three sets of single-phase AC-DC converters with Y-type connection, and their output are following with three sets of full-bridge phase-shift converters in parallel connection on the output side to complete the three-phase AC-DC conversion. The proposed AC-DC converter adopts single-cycle control based method to implement the power factor correction function. This method is easy and convenient than the traditional control method. The traditional method needs to detect the mains voltage, and the design of the sensing element is relatively complex when the input voltage is relatively high. The presented single-cycle control adopted in this This study discusses the input voltage control method for the three AC/DC converters on the input side, and the current sharing control method for full-bridge DC/DC converters in the output side. Finally, three sets of total 1500W systems are used to verify the proposed idea is feasible.
Chao, Kuo-Hen, and 趙國亨. "Low Frequency Ripple Compensation Methods for Single-Phase AC/DC Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/76634933535763114118.
Full text國立清華大學
電機工程學系
97
This thesis presents five power decoupling methods of single phase AC/DC converters using three switch poles to achieve unity power factor operations. The methods proposed compensate the pulsating power at twice the grid frequency by circulating the reactive power through the power decoupling capacitors between the third switch pole and DC bus. This approach can eliminate the need of large filter capacitor in DC side which is required to suppress the low frequency ripples. This thesis will explain the principles of operations of the proposed methods, and experimental results will also be presented for validation.
Wu, Che-Wei, and 吳哲維. "Study of a High Performance Single-Phase AC to DC Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/03528683928252552788.
Full text國立宜蘭大學
電機工程學系碩士班
96
A high performance single-phase AC to DC converter is proposed in this thesis. Basically the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost. A novel two-switch Cuk converter operates as an ac-to-dc converter with sinusoidal input current, unity power factor, and low ripple dc output voltage. Since both the input boost supply and the output supply can be controlled independently, a fast transient response can be maintained at both the input for active current waveshaping and at the output for good output regulation. Finally, some simulation and experimental results are presented for verification.
陳昭立. "Study of a High Power Factor Single-Phase Boost AC-DC Converter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/37602045494445347540.
Full text國立成功大學
工程科學系
89
Because of the need for high quality power, the harmonic standards are becoming stricter. Because the diode rectifier is ineffective in this higher standard, many theorems have been developed to improve the current waveforms. In general the advantage of hysteresis current control is that the current error can be kept within certain limit. However, the switching frequency is uneven and random, causing excessive stress on the switching device. The filter is also difficult to design. PWM methods with fixed switching frequency can reform current waveforms and have good response to load variations, but few studies have been conducted on the current error. The switching algorithm for a single-phase boost AC-DC converter is proposed in this thesis. The relation between the current error and switching period was developed. For a limit current error, the maximum switching period for an AC-DC converter can be achieved to reduce the switching loss and deliver nearly sinusoidal current waveforms with unity power factor. The proposed scheme was implemented using a 32-bit digital signal processor TMS320C32, analog to digital converter and digital to analog converter. Simulations and experimental results demonstrate the feasibility and fast dynamic response of the proposed control strategy.
Tsai, Wei Che, and 蔡維哲. "Analysis and Design of Single-Phase Bipolar Voltage Switching DC-AC Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11636705527367712422.
Full text東海大學
電機工程學系
100
In this paper we present the design and through the TSMC 0.25μm HV process to achieve a single-phase bipolar voltage switching DC-AC inverter. The design of the main structure is PWM bipolar switching technology and a level shift circuit connect to full-bridge circuit to do the DC input voltage to the AC output voltage control. A supply voltage and temperature-independent bandgap reference circuit is used in the inverter that has a output voltage of 9.4V/60Hz of sine wave. The AC sine wave voltage is provided to a small AC LED load. The chip area is 1.9 x 2.05mm2. Circuit simulation verifies the performance and feasibility of the conversion system.
Chen, Li Chung, and 陳立中. "Implementation of a single-phase DC/AC converter with power decoupling capability." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/05939419653712461220.
Full textSHEN, HONG-REN, and 沈鴻任. "New Three-port DC-AC Power Converter Outputting a Single-Phase and a Three-Phase Sinusoidal AC Voltages." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/30468808611251815777.
Full textQiu, Jain-Yao, and 邱建堯. "Parallel Control of Single Phase DC to AC Converters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/82952884560914331605.
Full text國立清華大學
電機工程學系
93
Abstract The application of single-phase DC to AC converters is quite popular. However, due to the limited voltage/current rating of power semiconductor components, the capacity of a single inverter is also constrained. A simple strategy to increase the output power capacity is by parallel operation of several inverters. In fact, the content of this thesis is focused on the research of parallel control techniques. Basically, the major contributions of this thesis may be summarized as follows. First, a novel control strategy is proposed to enhance greatly the dynamic performance of a single inverter. Only simple proportioned controls are adopted for the voltage regulator and the current regulator as well as for the feedforward and feedback controllers. The enhanced dynamic performance can be observed clearly from the transient response to a nonlinear load. Second, based on the previous control, a novel parallel control strategy is proposed to achieve the goal of uniform sharing of the output current for each inverter. Again, in addition to the uniform current sharing characteristic, the merits of fast response and with zero steady state error of a single inverter control can be preserved for the compound system. Finally, a prototype system is successfully constructed by using a high speed digital signal processor, namely DSPTMS320F2812. Experimental results show that the proposed parallel control strategy can indeed achieve the desired performance.
Siao, Kun-Cheng, and 蕭琨澄. "Single-phase Bi-directional AC/DC Converter with Power Factor Correction and Phase-Locked Loop." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/14660587232864353104.
Full text國立中山大學
電機工程學系研究所
102
With the development of smart grids, more and more Distributed Generation Systems (DGSs) and Renewable Energy Generation Systems (REGSs) will be interconnected to power grids in the foreseeing future. Most of DGSs and REGSs are DC power sources; therefore, power inverters are used to convert DC power of DGSs and REGSs to AC powers and to interconnect to power grids. In addition, most of REGSs are unstable power sources; they require Energy Storage Systems (ESSs) to stabilize output power. The ESSs can be charged by the REGSs and by power grids if necessary, so the design and development of a bi-directional AC/DC converter is necessary. This thesis develops and implements a single-phase bi-directional AC/DC converter with power factor correction and phase-locked loop. A fully digital controller for the implemented 1kW bi-directional AC/DC converter is designed by Microchip dsPIC33FJj16GS504. Experimental results show that the proposed single-phase bi-directional AC/DC converter can not only has rated power of 1kW but also achieve power factor correction and phase-locked loop.
HSU, JUI-PO, and 徐瑞柏. "Three-phase Impedance-Source Bidirectional AC/DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n5b7ft.
Full text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.
Zargari, Navid Reza. "A novel high performance current regulated DC/AC converter for single phase and three phase systems." Thesis, 1990. http://spectrum.library.concordia.ca/4599/1/MM64754.pdf.
Full textLiu, Hsing-Fu, and 劉興富. "Novel Single-Phase Single-Stage AC/DC Converters with Input Current Shaper." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70858281911225827342.
Full text國立交通大學
電機與控制工程系所
93
This dissertation presents a new input current shaper (ICS) for single-phase single-stage AC/DC converters with harmonic current correction and fast output voltage regulation. The proposed ICS are applied in flyback structure, forward structure, and bridge structure with the function of harmonic current correction. All the circuits are analyzed in steady state consideration. The study contains operation principle analysis, critical parameters analysis, design procedure. Finally, simulations and experiment results are shown for verifications. In the proposed AC/DC converters, an extra winding wound in the transformer provides two key advantages: (i) The size of the bulk inductor used in the conventional boost-based PFC cell can be significantly reduced in the proposed converters. In same output power application, the main transformer should has similar size but the boost inductor in prior single-stage PFC converter will be up to 1.7Lm or 1.4mH, and the inductor L1 in the proposed circuit can be down to 0.1Lm or 30μH. (ii) The voltage across bulk capacitor can be held under 450V by tuning the transformer windings ratio even though the converter operates in a wide range of input voltages (90V~265V/ac). Similar technique has been reported in recent years, but complex control circuit is needed to achieve high power factor or still use a bulk inductor in the boost-cell in the front stage of the converter. In a competitive market of switching power supply, the main consideration includes a simple, reliable, and cost-effective. Therefore, there is an improved opportunity in those presented solutions. These new converters comply with IEC 61000-3-2 class D from the load range up to 600W, and can achieve fast output voltage regulation. The proposed circuit has a simple, reliable, and cost-effective structure. The switching frequency is fixed in the proposed converters, which benefits the design of transformer and EMI filter. The proposed solution employs conventional controller, UC3842 or TL494, to implement the circuits and the solution can comply with the agent’s standards.
Chen, Yan-Ming, and 陳彥名. "Efficiency Analysis of a Single-Phase AC/DC Converter and its Power Decoupling Circuit." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/08074079210558647676.
Full text國立清華大學
電機工程學系
99
This thesis compares three kinds of power decoupling circuits of single phase AC/DC converters .The converters have Power factor correction and bidirectional power flow capability and compensate the pulsating power at twice the grid frequency by power decoupling circuits. In order to improve the overall efficiency of DC/AC converter, an overall power loss analysis was conducted. The proposed methods compensate the pulsating power at twice the grid frequency by circulating the reactive power through power decoupling capacitor; the capacitance which used in dc bus can be eliminated. The elaborate calculation of conduction loss, switching loss, reverse recovery loss, copper loss, and core loss are presented to give a quantitative analysis of power loss, through losses analysis to choose the suitable switches and use optimal inductance to improve efficiency. This thesis will explain the principles of operations of the proposed methods, and experimental results will also be presented for validation.
Chen, Yo-Ming, and 陳佑民. "Simulation and Analysis of Digitally Controlled Single-Phase Full-Bridge PWM AC-DC Converter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/42279849350484417633.
Full text國立交通大學
電機與控制工程系
89
This thesis presents the simulation and analysis in power factor correction, output voltage regulation and power flow for full-bridge switching mode rectifier(SMR). The circuit operation of the full-bridge SMR circuit is introduced first, and then the pulse width modulation is analyzed. Finally the output voltage, input inductance and dc-BUS capacitance are derived as a basis for the selection of the input inductor and output capacitor. This thesis applied the PSIM simulation software to generate a digital control full-bridge SMR model and a closed control loop. To simulate and analyze the results in different switching modes and different conditions including changing load, varying input voltage, the PFC for regeneration mode load, output voltage regulation and the power flow in SMR converter. The simulation results can be take as a reference for implementing DSP based digital control circuit.
Ciou, Yi-Fan, and 邱逸凡. "A Single-phase Full-bridge Boost-buck AC/DC Converter with Adjustable Power Factor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/38752q.
Full text國立虎尾科技大學
電機工程研究所
97
This thesis presents a novel single-phase full-bridge AC/DC converter is constituted by combining a single-phase full-bridge power circuit with and a DC SEPIC converter. Basically, it has several advantages such as boost/buck voltage, sinusoidal input current, adjustable power factor and low switching losses etc. A generalized zero vector(GZV) technique is applied to the proposed converter, such that the power circuit is integrated into a single stage. Digital control of the converter is implemented by VisSim software and TI DSP TMX320F2833 chip. Some advantages, such as small size, easy revision for parameters, and development with less cost, are achieved. Furthermore, use of the dead-band control strategy reduces effectively the switching loss of power switches. Besides, transfer function for both middle-capacitor voltage to duty cycle and output voltage to duty cycle is derived. On the other hand, circuit response of the converter is simulated using MATLAB. Moreover, some experimental results are also presented for verification.
Liao, Jen-Chuan, and 廖仁詮. "Design of a Single-Phase High Input Power Factor and Low Voltage Regulation AC-DC-AC Power Converter." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/71901152293071288265.
Full text大同工學院
電機工程學系
84
The purpose of this thesis is to analyze and design a new single-phase ac-dc-ac converter with high input power factor and low voltage regulation features. The system consists of a ac-dc switch-mode rectifier and dc-ac full bridge inverter. A switch-mode rectifier employing a voltage reversal circuit is proposed, in which the dc link voltage is superposed on the input voltage at the on-time duration of the power-switching device, and uses active waveshaping method to reduce the input current distortion caused by the small supply voltage at heavy load condition. In addition, by using feedback control to compensate the voltage drop on the output inductor reduces the influence of the inverter output impedance to achieve low voltage regulation. A single-chip microcontroller (80C196 KC) is used to implement the control methods of the proposed system. Experimental results justify the input and output performance of the proposed system that will be better than the conventional four types of converter.
Li, Mao-Shun, and 李茂順. "Design and Implementation of a Single-Stage Three-Phase High Power Factor AC-DC Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/15540894482618974959.
Full text國立成功大學
電機工程學系碩博士班
96
In this thesis, a single-stage high power factor three-phase AC-DC converter is proposed. The proposed converter is composed of a three phase AC-DC buck/boost converter integrated with a DC-DC buck-boost converter. The front semi-stage circuit is used for power factor correction and the rear semi-stage circuit is used for DC-DC conversion. The proposed converter can achieve unity power factor with a simple control and structure. The operation principles and characteristics of the proposed converter are discussed. Finally, the single-stage power supply of 500W is performed with a line input voltage of 200 Vrms 10% and DC output 48V/500W is performed in the laboratory to verify the feasibility of the proposed converter.
Fang, Kuan-Hui, and 方冠輝. "Study of Novel Soft-switching Technologies Used in Single Phase Isolated PFC AC-DC Converter." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/81856898456075148251.
Full text國立成功大學
電機工程研究所
82
Traditionally,the AC-DC converter used a passive rectifier, add large capacitor,but it will produce an amount of input current harmonics,These large input current harmonics will make not only the power factor but also the power quality is poor,so in this thesis will use a average current mode control to make the unity power factor,and use a feedforward method make the output voltage has a better dynamic response when the input voltage various.For safty ,in the proposed converter a isolated high frequency transformer is used.In this thesis ,the proposed converter used a boost type push- pull converter to achieve our goal.For increasing the efficiency a novel soft-switching technologies is used to reduce the switching losses.Finally,a single-phase 1KVA push-pull boost converter is setup to verify the predicted and analyzed result. The experimental result show that the proposed push-pull converter has unity power factor, high power conversion efficiency,small size,light weight,low THD,low EMI and fast transient response.
Ding, Pei-Lun, and 丁培倫. "A Novel Single-Phase Half-Bridge AC/DC Converter with Regeneration and Adjustable Power Factor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/zy23gw.
Full text國立虎尾科技大學
電機工程研究所
98
The thesis proposes a novel single-phase half-bridge AC/DC converter with energy regeneration and adjustable power factor. Based on a generalized zero vector technique , the novel single-stage converter of AC to DC consists of a single-phase half-bridge boost rectifier and a buck converter. The proposed converter has several advantages such as input current sinusoidal waveform, energy regeneration and adjustable power factor etc.. By TI TMS28335 DSP and Vissim Embeded control software the digital control circuit is achived. To detect output voltage and input current, current harmonic and power factor can be improved. Furthermore, both DC and small signal mathmatic models of the proposed converter are established to obtain system transfer function. Finally, some experimental results are presented to verify the effectiveness of the proposed converter.
Yeh, Yu-Ting, and 葉昱廷. "A Single-phase DC-AC Converter with High Dynamic Response and Bi-directional Power Flow Control." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/4sfwp7.
Full text國立臺北科技大學
電機工程系研究所
99
This paper is aimed to design a single-phase DC- AC converter with bi-directional power flow control. The converter is implemented by a full-bridge circuit with bipolar PWM control to act as grid-connected inverter or provide transient current to non-linear load to reduce AC voltage harmonics. A power device with both motoring and generating mode is connected to DC link and controls power flow between power device in DC-side and power grid in AC-side of the proposed DC-AC converter according to DC link voltage. The converter becomes DC-AC converter and sends the energy generated by the power device to electric grid when the DC-link voltage is higher than default voltage command. As the DC link voltage is less than default voltage command, the proposed converter withdraws power from electric grid to the power device. Meanwhile, the converter also provides near unity power factor control for electric grid in the bi-directional power flow control. In order to enhance light-load efficiency of the proposed converter when send the energy to electric grid, an integral-cycles injection of current is developed. When the generated power is less than a preset value, the energy will be stored in the electrolytic capacitance installed in the DC link and all the power switches of full-bridge circuit are turned off. In the need of high dynamic response for AC power supply with line frequency transformer as isolated output, the AC-side of the proposed converter is connected to output of the line-frequency transformer. The converter co-works with the AC power supply and provides extra transient current, which is determined by the difference between AC voltage command and actual voltage of load, for the nonlinear loads to compensate the voltage distortion. Therefore, output voltage harmonics of the AC power supply can be reduced dramatically to meet the requirement of regulations. A single-phase full-bridge DC-AC converter controlled by a DSP-TMS320F28035 with 110V/1 kW is constructed. To realize the digital power control, all the controlling strategies are written by software. Some experimental results are provided to show its efficiency.
Hsu, Ming-Jun, and 許銘圳. "Study and Implementation of a DSP-Based Single-Phase Active Power Factor Correction AC/DC Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/95431676306573326421.
Full text國立雲林科技大學
電機工程系碩士班
91
This thesis presents a DSP-based fully digital-controlled single-phase power factor converter (PFC). The proposed PFC controller consists of an inner current-loop controller and an outer voltage-loop controller. The current-loop controller adopts hysteresis current control to achieve power factor correction. The voltage-loop controller employs a PI controller to achieve output voltage regulation. This paper adopts TMS320F240 digital signal processor (DSP) as the controller to achieve high power factor, low steady-state error, output voltage regulation, phase- locked loop and parallel operation. Finally, an experimental test was carried out on a 500 W PFC converter using DSP controller and the experimental results verify the feasibility and superiority of the proposed digital AC/DC converter.
Shu, Kuei-Yuan, and 徐貴源. "A Study of Single-Phase Voltage Controllede PWM AC-to-DC Converter with Unity power factor." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/85787236503117541101.
Full text國立成功大學
電機工程研究所
82
A novel analog-controller is proposed in this thesis for the voltage controlled single phase ac-to-dc converter. The input filter inductor and output filter capacitor of the con- veter are calculated precisely to meet the costumed specifi- cation .In addttion, the minimum output voltage to maintain unity power factor at a specified load is further derived for designing consideration . Finally, 3kW prototype with the proposed analog-controller is implemented , and the results are verified by simulation and experiment.
Chi, Pei-Chin, and 紀培錦. "A Grid-Tie Control Scheme and Efficiency Optimization for Single-Phase DC/AC Voltage-Sourced Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/df8aqh.
Full text國立臺灣科技大學
電子工程系
105
Single-phase distributed power generation system enables renewable energies to be distributed over residential sites and transfers the generated electricity to utility grid, wherein it is usually with direct-current (DC) and alternating-current (AC) grids interfaced by a DC/AC converter which converts and flows the electricity between the grids. To reduce harmonic current and simplify the grid-tie control (GTC), this study proposes a voltage-oriented control scheme for four-quadrant grid-tie of a single-phase DC/AC voltage-sourced converter (VSC) to operate smartly at modes of unity power factor rectifier, inverter, or static VAR compensator. The proposed GTC, in system view, reduces harmonic current and enhances the quality and efficiency for power transfer. Nonetheless, in component view, Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) can be utilized to raise switching frequency while Zero Voltage Switching-Clamped Voltage (ZVS-CV) technique eliminates switching loss. Then, heat sink and filter can both be shrunk so that compact VSC can fit the single-phase system in residential site. In order to ensure the ZVS-CV operation, the energy-storing choke of VSC must flow high ripple current that trades off conduction loss of MOSFETs, it motivates this study to propose strategies to optimize the ripple current and efficiency. Simulations and experiments are conducted with a One-Cycle controlled full-bridge VSC to verify the proposed GTC and evaluate its performance for 110 V AC grid under 2 A. Simulations are conducted to compare efficiencies of the 220 V AC inverters about 1 kW load with and without the proposed optimization strategies.
Lu, An-Sheng, and 呂安生. "A Single-Phase Full-Bridge AC/DC Converter with Bidirectional Power Flow and Adjustable Power Factor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73eavd.
Full text國立虎尾科技大學
電機工程研究所
99
This thesis proposes a single-phase full-bridge AC/DC converter with bidirectional power flow and adjustable power factor. Based on a generalized zero vector technique, the proposed AC/DC converter combines a single-phase boost rectifier and a buck-boost converter into a single-stage AC/DC converter. The proposed converter has several advantages such as energy regeneration, sinusoidal waveform and adjustable power factor in the input. TI DSP TMS28335 chip and Vissim Embeded control software are both employed to achieve digital control requirement.The advantages of the converter include small size and easy adjustment for control parameters. Detecting output voltage, intermediate capacitance voltage, input voltage and current reaches relative control parameters. A derived modulation function is applied to control circuit, then the converter has faster response, and the advantages mentioned above. Furthermore, both DC and small signal mathematic models of the proposed converter are established to obtain the system transfer function. Finally, some experimental results, such as steady-state response and dynamic response are presented to verify the effectiveness of the proposed converter.
Juan, Yu-Ling, and 阮昱霖. "An Integrated High Performance Three-Phase Boost AC/DC Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84966863796430683917.
Full textChuang, Fu-Pao, and 莊富堡. "Modeless Predictive Current Control for Three-Phase AC/DC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/n2r699.
Full text國立臺北科技大學
電機工程系電力電子產業研發碩士專班
103
The objective of this thesis is to design and implement a three-phase AC/DC converter controlled by modeless predictive current control. The special features of the modeless predictive is to predict the optimal switching states in compliance with the cost function using the sensed current while not requiring the converter model. Only addition and subtraction operations are used, neither multiplication nor division operation is required, the implementation is simplified. Moreover, since converter model is not required in the presented modeless predictive control method, the impact of converter parameter can be significantly reduced. A prototype is realized with the following specifications: input voltage = 220 V/AC, output voltage = 380 V/DC. And the output power is 1000 W. A DSP, Renesas SH7216 is used as the controller to realize the presented modeless predictive current control in software. Both simulation and experimental results demonstrate that the input harmonics meet the IEC61000-3-2 Class A and output voltage can be well regulated and thereby confirming the effectiveness of the presented control technique and design of three-phase AC/DC converter.
CHENG, YU-CHEN, and 鄭宇辰. "Modeless Predictive Current Control for Three-Phase AC/DC Converter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/t2p644.
Full text國立臺北科技大學
電機工程系電力電子產業碩士專班
108
The main purpose of this thesis is to realize the application of three-vector duty cycle modulation modeless predictive current control on three-phase AC/DC converter. Traditional modeless predictive current control senses the amount of current change and uses a minimum cost function to predict a single optimal switching state within a single duty cycle. However, since only one switching state is used in one sampling period, the current tracking performance is limited. The three-vector duty cycle modulation modeless predictive current control consists of two adjacent effective vectors and one invalid vector. Three different modulation cycles and switching states are applied and sampled during a single duty cycle, and three different modulation cycles and switch states used during the next duty cycle are predicted. The control core used in the experimental system in this thesis is the digital signal processor TMS320F28379D, and is implemented in a fully digitalized control mode. The results confirm that the three-phase AC/DC converter using the modelless three-vector duty cycle modulation predictive current control has better current tracking performance than the conventional one.