Relevant bibliographies by topics / Single-Stage converter

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  2. Dissertations / Theses
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Academic literature on the topic 'Single-Stage converter'

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Published: 25 May 2024

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Journal articles on the topic "Single-Stage converter"

1

Sun, Bao Wen, and Yun Xi Wu. "Single-Stage Power Factor Correction (PFC) Converter Design." Applied Mechanics and Materials 687-691 (November 2014): 3383–86. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3383.

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A single-stage PFC converter was introduced in this paper, then the converter EMI filters, converters inductors, high-frequency transformers and power components were designed and chosen, proven to good effect.
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Fonseca, Z. P., C. B. Nascimento, and A. A. Badin. "Single-stage PFC bridgeless converter." Electronics Letters 56, no. 23 (November 12, 2020): 1267–70. http://dx.doi.org/10.1049/el.2020.2009.

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Mathew, Derick, Athira P. Ashok, and Bincy M. Mathew. "Modified Single Stage AC-AC Converter." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 1 (March 1, 2015): 1. http://dx.doi.org/10.11591/ijpeds.v6.i1.pp1-9.

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<p>The paper describes the single stage AC-AC converter. This converter is a good alternative to quasi direct back to back converter. This single stage converter is called Matrix Converter. Matrix converter is an array of controlled semiconductor switches that connects three phase source to the three phase load. This converter provides bidirectional power flow, sinusoidal input and output waveforms and they have no dc link storage elements. Simulation model and results presented showing Venturini control method of matrix converter.</p>
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Shen, Chih-Lung, Li-Zhong Chen, Tsung-Yung Chuang, and Yu-Shan Liang. "Cascaded-like High-Step-Down Converter with Single Switch and Leakage Energy Recycling in Single-Stage Structure." Electronics 11, no. 3 (January 24, 2022): 352. http://dx.doi.org/10.3390/electronics11030352.

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A cascaded-like high-step-down converter (CHSDC) is proposed in this article, which can steeply convert a high voltage to a much lower level without the utilizing of extreme turns ratio or duty ratio. The proposed converter integrates two buck-boost converters and one forward converter to form a single-stage architecture containing only a single low-side driving switch, which, as a result, can lower the cost and reduce the complexity of the associated control driver. Even in a single-stage single-switch structure, the ability to step down input voltage is as effective as the cascade of two buck-boosts and one forward converter. Meanwhile, the proposed converter can avoid the low efficiency caused by a cascaded structure. Without an additional clamp circuit, the leakage energy stored in the transformer of the CHSDC can be still recycled so as to raise the efficiency of the converter and suppress voltage spikes at the power switch. Converter operation principle and key parameter design are discussed. Moreover, a 200 W prototype is built and then tested to validate the proposed converter and verify the theoretical analysis.
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Hsu, Yuan Yong, and Chuan Wen Lai. "Design and Implementation of Single-Stage Boost Converter in Wind Power System." Advanced Materials Research 201-203 (February 2011): 2690–94. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2690.

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A new boost converter without an inductor is proposed for a small-scale wind power generator system. Experiments were carried out to compare the output powers and power conversion efficiencies for the converter without an inductor and the one with an inductor. Experimental results for the converters operated at both constant resistance mode and constant voltage mode were given. It was found that efficiencies for the converter without an inductor and for the one with an inductor are essentially the same. The cost may be reduced since the inductor is not needed in the proposed boost converter without an inductor.
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Shukla, Tanmay, N. P. Patidar, and Apsara Adhikari. "A Single-Stage Isolated Battery Charger Using Nonbridged Positive Cuk Converter Configuration." IET Electrical Systems in Transportation 2023 (December 20, 2023): 1–12. http://dx.doi.org/10.1049/2023/6650034.

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This article presents a nonbridged isolated positive Cuk (NB-IPCuk) converter-based single-stage battery charging system (SSBCS). The architecture of the suggested charger ensures the intrinsic advantage of power quality improvement in discontinuous current conduction (DCC) mode at the supply mains. The suggested NB-IPCuk converter scheme has fewer components than other bridgeless/nonbridged Cuk converter schemes. This is because the NB-IPCuk converter is a partial integration of two Cuk converters. The usage of the Cuk converter garnishes the system with input and output inductances, which lessens supply current harmonic distortion and, thus supply terminal low pass filter requirement is eradicated. The advantages of the NB-IPCuk converter are the eradication of one inductor and multiple diodes (two back-feeding diodes), which are generally used in NB converter configurations. In place of two separate inductors, the NB-IPCuk converter uses a single secondary side output inductor. The usage of BL configuration of NB-IPCuk converter eradicates the bridge rectifier (BR) stage, and thus, the BR-associated losses also got eradicated. The NB-IPCuk converter also garnishes the system with electrical isolation which adds to the safety standards of the system. DCC mode operation of the NB-IPCuk converter is used in the present work. DCC mode requires lesser sensors in comparison to continuous current conduction mode. The abovementioned benefits of the NB-IPCuk converter make the SSBCS system cheaper, compact, and more efficient. The detailed stability analysis (Bode diagram and pole-zero map) and mathematics for the NB-IPCuk converter are also included in the paper. The prototype and MATLAB/Simulink model of NB-IPCuk converter-based SSBCS system with DCC mode control has been built, and results of both prototype and MATLAB/Simulink are deployed to verify SSBCS system’s performance during dynamic and steady-state conditions.
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Jiang, Maoh Chin, and Bing Jyun Shih. "A Single-Stage DC Uninterruptible Power Supply." Applied Mechanics and Materials 764-765 (May 2015): 466–70. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.466.

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A single-stage DC uninterruptible power supply (UPS) is proposed in this paper. 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 for extra UPS function. Under normal operation, a novel two-switch SEPIC converter operates as an ac to dc converter with sinusoidal input current, unity power factor, and low ripple dc output voltage, and as a battery charger if a battery is added. 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 wave shaping and at the output for good output regulation. When the ac source is in an outage condition, the proposed converter functions as a dc-to-dc buck-boost converter; therefore, the desired dc output voltage can be provided. Finally, some experimental results are presented for verification.
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Biswas, Shuvra Prokash, Md Shihab Uddin, Md Rabiul Islam, Sudipto Mondal, and Joysree Nath. "A Direct Single-Phase to Three-Phase AC/AC Power Converter." Electronics 11, no. 24 (December 16, 2022): 4213. http://dx.doi.org/10.3390/electronics11244213.

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The traditional DC-link indirect AC/AC power converters (AC/DC/AC converters) employ two-stage power conversion, which increases the circuit complexity along with gate driving challenges, placing an excessive burden on the processor while implementing complex switching modulation techniques and leads to power conversion losses due to the use of a large amount of controlled power semiconductor switches. On the contrary, the traditional direct AC/AC voltage controllers, as well as frequency changers, suffer from high total harmonic distortion (THD) problems. In this paper, a new single-phase to three-phase AC/AC step-down power converter is proposed, which utilizes a multi-linking transformer and bilateral triode thyristors (TRIACs) as power semiconductor switches. The proposed direct AC/AC power converter employs single-stage power conversion, which mitigates the complexity of two-stage DC-link indirect AC/AC converters and traditional single-stage AC/AC frequency changers. Instead of using high-frequency pulse width modulated gate driving signals, line frequency gate pulses are used to trigger the TRIACs of the proposed AC/AC converter, which not only aids in reducing the power loss of the converter but also mitigates the cost and complexity of gate driver circuits. The proposed AC/AC converter reduces the THD of the output voltage significantly as compared to traditional direct AC/AC frequency changers. The performance of the proposed AC/AC converter is validated against RL and induction motor load in terms of overall THD and individual harmonic components through MATLAB/Simulink environment. A reduced-scale laboratory prototype is built and tested to evaluate the performance of the proposed AC/AC power converter. The experimental and simulation outcomes reveal the feasibility and excellent features of the proposed single-phase to three-phase AC/AC converter topology.
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ROH, CHUNG-WOOK, GUN-WOO MOON, and MYUNG-JOONG YOUN. "SINGLE-STAGE SINGLE-SWITCHED RECTIFIER/REGULATOR WITH MAGNETIC COUPLED NONDISSIPATIVE SNUBBER." Journal of Circuits, Systems and Computers 13, no. 03 (June 2004): 557–76. http://dx.doi.org/10.1142/s0218126604001465.

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This paper presents a new single-stage single-switched forward converter with magnetic coupled nondissipative snubber, which gives good power factor correction (PFC), low current harmonic distortion, and tight output voltage regulation. The proposed converter features low switch current and voltage stresses, essential for the design of a single-stage power factor correction converter. The prototype shows that the IEC1000-3-2 requirements are met satisfactorily with nearly unity power factor. This proposed converter with magnetic coupled nondissipative snubber is particularly suited for power supply applications with low power level.
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Uddin, Md Shihab, Shuvra Prokash Biswas, Md Rabiul Islam, Md Shamim Anower, Abbas Z. Kouzani, and M. A. Parvez Mahmud. "A New Generalized Step-Down Single-Stage AC/AC Power Converter." Sustainability 12, no. 21 (November 4, 2020): 9181. http://dx.doi.org/10.3390/su12219181.

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Most traditional AC/AC power converters suffer from power quality problems and multi-stage power conversion losses. The rectifier and inverter-based AC/AC converter topology not only increases multi-stage power conversion losses, but also increases the volume, weight, and cost, and decreases the longevity of the converter due to the DC-link capacitor, line filter and electromagnetic interference (EMI) filter. High-frequency (about 10 kHz) switching advanced pulse width modulation techniques are generally used in order to compensate the power quality problems, which increase the switching losses and introduce the EMI problems. In this paper, a new generalized step-down single-stage line-frequency switching AC/AC power converter topology is proposed. The proposed converter uses line-frequency switching, and does not require any pulse width modulation techniques. The proposed topology offers promising performances in terms of lower order harmonics, total harmonic distortion, the elimination of DC-link capacitors and EMI filters, and switching losses. The circuit was designed and simulated in a MATLAB/Simulink environment. A scaled-down laboratory prototype of the proposed topology was developed in order to validate the feasibility. The experimental and simulation results reveal the feasibility of the proposed generalized step-down single-stage converter topology, and its excellent features.
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Dissertations / Theses on the topic "Single-Stage converter"

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Saasaa, Raed. "A single-stage interleaved resonant power factor correction converter." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59199.

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Applications requiring DC voltages vary widely, from low power, such as LED lighting, to high power, as in industrial motor drives and battery chargers. Accordingly, a unified power architecture for all applications is not practical for efficiency, size and cost optimization. The use of LED lighting system became popular due to its many advantages. The new outdoor applications such as street and flood lighting require high power (i.e. >200 W) in contrast to the low power existing LED drivers. Generally, the conventional architecture of AC/DC converters consists of two main stages; The first is current-shaping stage to improve PF and the second is to provide isolation and tight regulation over the output voltage. Recently, the research on AC/DC converters has focused on optimizing the converter design to be more reliable and efficient for low and medium power applications. Specifically, techniques have been proposed to eliminate the DC output bus electrolytic capacitor by introducing auxiliary DC/DC converter. On the other hand, the integrated converters were deployed by many researchers to decrease the number of switches, facilitate the controller design, and improve the efficiency. This thesis presents a novel single-stage AC/DC converter that can achieve high power factor with reduced switching losses for semiconductor devices. The topology is derived by integrating the interleaved boost-type PFC and full bridge LLC resonant converters. Due to interleaving at the input, the converter exhibits less input current ripple compared to the existing topologies. Therefore, it is suitable for applications up to approximately 500 W. A detailed analysis of the operation modes is presented. Also, a 350–W prototype is designed to verify the effectiveness of the topology.
Applied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
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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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Qian, Jinrong. "Advanced Single-Stage Power Factor Correction Techniques." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30773.

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Five new single-stage power factor correction (PFC) techniques are developed for single-phase applications. These converters are: Integrated single-stage PFC converters, voltage source charge pump power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a DC/DC converter into a single-stage converter. DC bus voltage stress at light load for the single-stage PFC converters are analyzed. DC bus voltage feedback concept is proposed to reduce the DC bus voltage stress at light load. The principle of operations of proposed converters are presented, implemented and evaluated. The experimental results verify the theoretical analysis. VS-CPPFC technique use a capacitor in series with a high frequency voltage source to achieve the PFC function. In this way, the input inductor is eliminated. VS-CPPFC AC/DC converters are developed, and their performance is evaluated. VS-CPPFC electronic ballasts with and without dimming function are also presented. The average lamp current control with duty ratio modulation is developed so that the lamp operates in constant power with a low crest factor over the line variation. The experimental results verify the CPPFC concept. CS-CPPFC technique employs a capacitor in parallel with a high frequency current source to obtain the PFC function. The unity power factor condition and principle of operation are analyzed. By doing so, the switch has less switching current stress, and deals only with the resonant inductor current. Design considerations and experimental results of the CS-CPPFC electronic ballast are presented. VSCS-CPPFC technique integrates the VS-CPPFC with the CS-CPPFC converters. The circuit derivation, unity power factor condition and design considerations are presented. The developed VSCS-CPPFC converters has constant lamp operation, low crest factor with a high power factor even without any feedback control. CIC-CPPFC technique is developed by inserting a small inductor in series with the line rectifier for the conceptual VS-CPPFC, CS-CPPFC and VSCS-CPPFC circuits. The circuit derivation and its unity power factor condition are discussed. The input current can be designed to be continuous, and a small line input filter can be used. The circulating current in the resonant tank and the switching current stress are minimized. The average lamp current control with switching frequency modulation is developed, so the developed electronic ballast operates in constant power, low crest factor. The developed CIC-CPPFC electronic ballast has features of low line input current harmonics, constant lamp power, low crest factor, continuous input current, low DC bus voltage stress, small circulating current and switching current stress over a wide range of line input voltage.
Ph. D.
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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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Lord, Edward Michael. "Single-stage power factor correction converter topologies for low power off-line applications." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/15234.

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Since January 2001 it has been necessary for equipment connected to the low voltage public distribution network in Europe and Japan to comply with IEC 61000-3-2. The regulation IEC 61000-3-2 specifies the level of current that can be drawn for particular harmonics. Much equipment today is fitted with a Switch Mode Power Supply (SMPS) at its input to interface between the line voltage and internal low voltage electronics. This SMPS must not only convert the line voltage, but also ensure that the input current to the device meets the IEC regulations. To meet these regulations two methods are normally used, passive filtering using a large filter inductor or a boost converter cascaded with the main DC/DC SMPS converter with isolation. To try and reduce component count, cost and increase efficiency many new single-stage Power Factor Correction (PFC) topologies have been proposed. In a single-stage topology the output voltage regulation and meeting IEC 61000-3-2 are combined into a single power stage. Unfortunately very little is known about the behaviour or performance of these single-stage topologies. In this thesis two of the more promising single-stage topologies, the bi-forward and CS S2PFC converters are investigated further. A new topology using a low frequency switch (LFSPFC) is introduced. The topologies are analysed investigating input current shape and harmonic content, voltage variation on bulk capacitance and component stresses. Simulation in PSpice is used to confirm circuit operation. Four 150W output power experimental circuits were built: bi-forward converter, CS S2PFC converter, passive filtering cascaded with a forward converter and a boost pre-regulator cascaded with a forward converter. The converters operate from universal input voltage and have outputs at 5V and 12V. A 100W test circuit was built for the LFSPFC operating from 230V input voltage and with an output of 5V. Experimental results are presented showing circuit behaviour and performance of the bi-forward, CS S2PFC and LFSPFC converters. The bi-forward and CS S2PFC converters are compared to the passive filter and boost converter cascaded with a forward converter. It is demonstrated that neither of these single-stage topologies is at present a viable replacement for either present method, but the LFSPFC could be a lighter weight and less bulky alternative to passive filtering.
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Heidinger, Michael [Verfasser], and W. [Akademischer Betreuer] Heering. "Long Life Single Stage PFC/SLC Converter driving LEDs / Michael Heidinger ; Betreuer: W. Heering." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1195049293/34.

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Rustom, 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.

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With the increased interest in applying Power Factor Correction (PFC) to off-line AC-DC converters, the field of integrated, single-stage PFC converter development has attracted wide attention. Considering the tens of millions of low-to-medium power supplies manufactured each year for today's rechargeable equipment, the expected reduction in cost by utilizing advanced technologies is significant. To date, only a few single-stage topologies have made it to the market due to the inherit limitations in this structure. The high voltage and current stresses on the components led to reduced efficiency and an increased failure rate. In addition, the component prices tend to increase with increased electrical and thermal requirements, jeopardizing the overarching goal of price reduction. The absence of dedicated control circuitry for each stage complicates the power balance in these converters, often resulting in an oversized bus capacitance. These factors have impeded widespread acceptance of these new techniques by manufacturers, and as such single stage PFC has remained largely a drawing board concept. This dissertation will present an in-depth study of innovative solutions that address these problems directly, rather than proposing more topologies with the same type of issues. The direct energy transfer concept is analyzed and presented as a promising solution for the majority of the single-stage PFC converter limitations. Three topologies are presented and analyzed based on this innovative structure. To complete the picture, the dynamics of a variety of single-stage converters can be analyzed using a proposed switched transformer model.
Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
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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 inverter/rectifier (charger) topology is derived based on the QSS power conversion concept. A simple active voltage clamp branch is used to clamp the otherwise high transient voltage on the current-fed ac side, and at the same time, to achieve zero-voltage-switching (ZVS) for the switches in the output side bridge. Seamless four-quadrant operation in the inverter mode, and rectifier operation with unity power factor in the charger (rectifier) mode are realized with the proposed uni-polar center-aligned PWM scheme. Single-stage power conversion, standard half-bridge connection of devices, soft-switching for all the power devices, low conduction loss, simple center-aligned PWM control, and high reliability and efficiency are among its salient features. Experimental results on a 3 kVA bi-directional inverter/rectifier prototype validate the reliable operation of the circuit. Other single-phase and three-phase QSS bi-directional inverters/rectifiers can be easily derived as topological extensions of the basic QSS bi-directional inverter/rectifier. A new QSS isolated three-phase zero-voltage/zero-current-switching (ZVZCS) buck PWM rectifier for high-power off-line applications is also proposed. It consists of a three-phase buck bridge switching under zero current and a phase-shift-controlled full-bridge with ZVZCS, while no intermediate dc-link is involved. Input power and displacement factor control, input current shaping, tight output voltage regulation, high-frequency transformer isolation, and soft-switching for all the power devices are realized in a unified single stage. Because of ZVZCS and single-stage power conversion, it can operate at high switching frequency while maintaining reliable operation and achieving higher efficiency than standard two-stage approaches. A family of isolated ZVZCS buck rectifiers are obtained by incorporating various ZVZCS schemes for full-bridge dc-dc converters into the basic QSS isolated buck rectifier topology. Experimental and simulation results substantiate the reliable operation and high efficiency of selected topologies. The concept of charge control (or instantaneous average current control) of three-phase buck PWM rectifiers is introduced. It controls precisely the average input phase currents to track the input phase voltages by sensing and integrating only the dc rail current, realizes six-step PWM, and features simple implementation, fast dynamic response, excellent noise immunity, and is easy to realize with analog circuitry or to integrate. One particular merit of the scheme is its capability to correct any duty-cycle distortion incurred on only one of the two active duty-cycles which often happens in the soft-switched buck rectifiers, another merit is the smooth transition of the input currents between the 60o sectors. Simulation and preliminary experimental results show that smooth operations and high quality sinusoidal input currents in the full line cycle are achieved with the control scheme.
Ph. D.
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Wen, Hao. "High-Efficiency and High-Frequency Resonant Converter Based Single-Stage Soft-Switching Isolated Inverter Design and Optimization with Gallium-Nitride (GaN)." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/105134.

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Isolated inverter can provide galvanic isolation which is necessary for some applications with safety regulations. Traditionally, a two-stage configuration is widely applied with isolated dc-dc stage and a sinusoidal pulse-width-modulated (SPWM) dc-ac stage. However, this two-stage configuration suffers from more components count, more complex control and tend to have lower efficiency and lower power density. Meanwhile, a large dc bus capacitor is needed to attenuate the double line frequency from SPWM for two-stage configuration. Therefore, the single-stage approach including an isolated dc-rectified sine stage and a line frequency unfolder is preferable. Since the unfolder circuit is at line frequency being almost lossless, the isolated dc-rectified sine stage becomes critical. However, the relevant research for the single-stage isolated inverter is limited. People either utilize PWM based converter as dc-rectified sine stage with duty cycle adjustment or apply SRC or LLC resonant converter for better soft switching characteristics. For PWM based converter, hard switching restricts the overall inverter efficiency, while for SRC/LLC, enough wide voltage gain range and full range ZVS are the major issues. This dissertation aims to provide solutions for a high-efficiency, high-frequency resonant converter based single-stage soft-switching isolated inverter design. The LLC and LCLCL resonant converters are applied as the isolated dc-rectified sine stage with variable frequency modulation (VFM). Therefore, the rectified sine wave generation consists of many dc-dc conversion with different switching frequencies and an efficient dc-rectified sine stage design needs each dc-dc conversion to be with high efficiency. This dissertation will first propose the optimization methods for LLC converter dc-dc conversion. ZVS models are derived to ensure fully ZVS performance for primary side GaN devices. As a large part in loss breakdown, the optimization for transformer is essential. The LLC converter can achieve above 99% efficiency with proposed optimization approach. Moreover, the channel turn-off energy model is presented for a more accurate loss analysis. With all the design and optimization considerations, a MHz LLC converter based isolated inverter is designed and a hybrid modulation method is proposed, which includes full bridge (FB) VFM for output high line region and half bridge (HB) VFM for output low line region. By changing from FB to HB, the output voltage gain is reduced to half to have a wider voltage gain range. However, the total harmonic distortion (THD) of output voltage at light load will be impacted since the voltage gain will be higher with lighter load at the maximum switching frequency. A MHz LCLCL converter based isolated inverter is proposed for a better output voltage THD at light load conditions. The paralleled LC inside the LCLCL resonant tank can naturally create a zero voltage gain point at their resonant frequency, which shows superior performance for rectified sine wave generation. Besides the better THD performance, the LCLCL converter based isolated inverter also features for easier control, better ZVS performance and narrower switching frequency range. Meanwhile, the LCLCL based inverter topology has bi-directional power flow capability as well. With variable frequency modulation for ac-dc, this topology is still a single-stage solution compared to the traditional two-stage solution including PFC + LLC configuration.
Doctor of Philosophy
Inverters can convert dc voltage to ac voltage and typically people use two-stage approach with isolated dc-dc stage and dc-ac stage. However, this two-stage configuration suffers from more components count, more complex control and tend to have lower efficiency and lower power density. Therefore, the single-stage solution with dc-rectified sine wave stage and a line frequency unfolder becomes appealing. The unfolder circuit is to unfold the rectifier sine wave to an ac sine wave at the output. Since the unfolder is at line frequency and can be considered lossless, the key design is for the dc-rectified sine stage. The resonant converter featured for soft switching seems to be a good candidate. However, the inverter needs soft switching for the whole range and an enough wide voltage gain, which makes the design difficult, especially the target is high efficiency for the overall inverter. This dissertation aims to provide solutions for a high-efficiency, high-frequency resonant converter based single-stage soft-switching isolated inverter design. The LLC and LCLCL resonant converters are applied as the isolated dc-rectified sine stage with variable frequency modulation (VFM). Therefore, the rectified sine wave generation consists of many dc-dc conversion with different switching frequencies and an efficient dc-rectified sine stage design needs each dc-dc conversion to be with high efficiency. The design considerations and optimization methods for the LLC dc-dc conversion are firstly investigated. Based on these approaches, a MHz LLC converter based isolated inverter is designed with proposed hybrid modulation method. To further improve the light load performance, a MHz LCLCL converter based isolated inverter topology is proposed. The paralleled LC inside the LCLCL resonant tank can naturally create a zero voltage gain point which shows superior characteristics for rectified sine wave generation. Moreover, the LCLCL resonant converter based topology has bi-directional capability as well so it can work well for ac voltage to dc voltage conversion.
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Li, Heng-Yi, and 李恆毅. "Single-Stage Parallel Boost-Flyback Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16540659760349787865.

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博士
國立交通大學
電控工程研究所
98
It is known that part of the power is repeatedly processed or recycled in the conventional single-stage (S2) and two-stage AC/DC converters. Therefore, a novel S2 scheme is presented based on the parallel power factor correction (PPFC). In the scheme, the boost-flyback semi-stage containing boost cell and flyback cell is used to generate two energy processing path. The main input power flow stream is processed only by flyback cell and output to load directly. And the remaining input power stream is stored in bulk capacitor by boost cell and then transferred by DC/DC semi-stage to output for regulating output power. Theoretical analysis shows that as the boost cell and flyback cell operate in DCM and duty ratio and switching frequency are kept constant, using smaller boost inductor can result in higher power factor. Since most power is processed only once, the power conversion efficiency is improved and the current stress of control switch is reduced. The scheme can also be applied to other conversion circuits by replacing flyback cell and DC/DC semi-stage with other topology. Taking the parallel boost-flyback-flyback converter as an example, the operation modes and average switching period signals are analyzed, the key parameters of power distribution and bulk capacitor voltage, design equations, and design procedure are also presented. By follow-ing the procedure, an 80 W universal prototype has been built and tested. The experimental results show that at the worst condition of operation range the measured line harmonic current complies with the IEC61000-3-2 class D limits, the maximum bulk capacitor voltage is about 415.4 V, and the maximum efficiency is about 85.8%. It can be seen from the converter analysis, there are two operation modes in half line cycle and the duty ratio varied with line phase to keep output constant in one mode. The small sig-nal transfer function of the converter with variable duty ratio cannot be validated with con-ventional frequency response measurement. Hence, the small-signal models of operation modes are built and the compensator design at the boundary of modes is presented, the dy-namic response has small steady state error, fast rise time, and heavily damping within opera-tion range. Finally, the dynamic model and designed compensator of parallel converter are verified in time domain by simulation and experiment.
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Book chapters on the topic "Single-Stage converter"

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Do, Hyun-Lark. "Single-Stage AC-DC Converter with a Synchronous Rectifier." In Lecture Notes in Electrical Engineering, 625–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27287-5_101.

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Gudhe, Siddhant, and Sanjeev Singh. "Single Stage Multiple Source Bidirectional Converter for Electric Vehicles." In Recent Advances in Power Electronics and Drives, 567–74. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9239-0_43.

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Lei, Min, Quanzhu Zhang, Mingyan Xu, and Xiaolei Sun. "Development of a Multiple Stage Single-three-Phase Power Converter." In Proceedings of the Second International Conference on Mechatronics and Automatic Control, 133–40. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13707-0_15.

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Narasimha, S., and Surender Reddy Salkuti. "Zeta Converter Interfacing in a Single-Stage Boosting Inverter for Solar Photovoltaic Array." In Lecture Notes in Electrical Engineering, 527–38. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4975-3_42.

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Midhun, P. M. "Single Stage High Voltage Gain Boost Converter for Battery Charging Using PV Panels." In Lecture Notes in Electrical Engineering, 601–9. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_59.

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Rafi, Shaik, Simhadri Lakshmi Sirisha, and Ravipati Srikanth. "A Hybrid Power Conversion System Using Three-Phase Single-Stage DC–AC Converter." In Lecture Notes in Electrical Engineering, 243–54. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2256-7_24.

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Gnanavadivel, J., S. Muralidharan, and S. Joe Magellah. "Power Quality Enhancement in Single Stage Non-inverted Output Bridgeless Buck–Boost Converter." In Springer Proceedings in Energy, 191–201. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0669-4_15.

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Ruan, Xinbo, Li Zhang, Xinze Huang, Fei Liu, Guoping Zhu, and Shiqi Kan. "Basic Approaches for Reducing Second Harmonic Current in Two-Stage Single-Phase Converters." In Second Harmonic Current Reduction Techniques for Single-Phase Power Electronics Converter Systems, 29–46. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1547-5_2.

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Gudhe, Siddhant, and Sanjeev Singh. "Charging of Multiple Batteries Using Single-Stage Multi-source Converter with Bidirectional Power Flow." In Lecture Notes in Electrical Engineering, 207–16. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0588-9_21.

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Zhang, Taizhi, Yimin Zhou, and Ziping Bai. "Line-Frequency Instability of Single-Stage PFC Flyback Converter: Theoretical Analysis and Experimental Validation." In The Proceedings of the 9th Frontier Academic Forum of Electrical Engineering, 165–75. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6606-0_16.

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Conference papers on the topic "Single-Stage converter"

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Nahavandi, Ali, Mehdi Roostaee, and Mohammad Reza Azizi. "Single stage DC-AC boost converter." In 2016 7th Power Electronics and Drive Systems Technologies Conference (PEDSTC). IEEE, 2016. http://dx.doi.org/10.1109/pedstc.2016.7556888.

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Saasaa, Raed, Wilson Eberle, and Mohammed Agamy. "A single-stage interleaved LLC PFC converter." In 2016 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2016. http://dx.doi.org/10.1109/ecce.2016.7854785.

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Wu, Li-Ming, and Yu-Ming Yeh. "A novel single stage photovoltaic energy converter." In 2009 International Conference on Power Electronics and Drive Systems (PEDS 2009). IEEE, 2009. http://dx.doi.org/10.1109/peds.2009.5385735.

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Burlaka, Vladimir, Sergey Gulakov, Svetlana Podnebennaya, Ekaterina Kudinova, and Olga Savenko. "Bidirectional single stage isolated DC-AC converter." In 2020 IEEE KhPI Week on Advanced Technology (KhPIWeek). IEEE, 2020. http://dx.doi.org/10.1109/khpiweek51551.2020.9250107.

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Qinglin, Zhao, Wen Yi, Wu Weiyang, and Chen Zhe. "A Single-stage Boost-Flyback PFC Converter." In 2006 5th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/ipemc.2006.297296.

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Qinglin, Zhao, Wen Yi, Wu Weiyang, and Chen Zhe. "A Single-stage Boost-Flyback PFC Converter." In 2006 5th International Power Electronics and Motion Control Conference (IPEMC 2006). IEEE, 2006. http://dx.doi.org/10.1109/ipemc.2006.4778217.

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Bong-Suck Kim, Jung-Min Kwon, Ho-Seon Ryu, Ik-Hun Lim, and Bong-Hwan Kwon. "A single-stage single-switch flyback converter with synchronous rectifier." In 2005 IEEE 11th European Conference on Power Electronics and Applications. IEEE, 2005. http://dx.doi.org/10.1109/epe.2005.219642.

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Sandhya, T., and Delia David. "A new single phase single stage power factor corrected converter." In 2014 International Conference on Circuit, Power and Computing Technologies (ICCPCT). IEEE, 2014. http://dx.doi.org/10.1109/iccpct.2014.7054805.

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Wang, Chien-Ming, Jyun-Che Li, and Yu-Ting Lai. "A Single-Stage Soft-Switching AC/DC Converter." In 2019 IEEE 4th International Future Energy Electronics Conference (IFEEC). IEEE, 2019. http://dx.doi.org/10.1109/ifeec47410.2019.9014684.

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Ribeiro, Hugo, Andre Pinto, and Beatriz Borges. "Single-stage DC-AC converter for photovoltaic systems." In 2010 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2010. http://dx.doi.org/10.1109/ecce.2010.5617957.

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Reports on the topic "Single-Stage converter"

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Bundschuh, Paul. 3-Port Single-Stage PV & Battery Converter Improves Efficiency and Cost in Combined PV/Battery Systems. Office of Scientific and Technical Information (OSTI), March 2013. http://dx.doi.org/10.2172/1157556.

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EFFECTS OF THE NUMBERS OF STORIES AND SPANS ON THE COLLAPSE-RESISTANCE PERFORMANCE OF MULTI-STORY STEEL FRAME STRUCTURES WITH REDUCED BEAM SECTION CONNECTIONS. The Hong Kong Institute of Steel Construction, June 2022. http://dx.doi.org/10.18057/ijasc.2022.18.2.10.

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Abstract:
The progressive collapse of a building structure under an accidental load involves a relatively complex mechanical behavior. To date, the collapse of single-story beam-column assemblies has been investigated extensively, revealing the resistance development of beams during progressive collapse. However, few studies of the progressive collapse behavior of multi-story frame structures have performed a systematic analysis of the Vierendeel action (VA) at a comprehensive level. It is difficult to convert quantitative analysis results accurately from the component level to the overall structure level to evaluate the collapse resistances of structures. To investigate the effects of the numbers of stories and spans on the collapse resistances of steel frame structures, a refined numerical simulation study of a multi-story frame model with different numbers of stories and spans was performed. First, the correctness of the finite element modeling method was verified by the collapse test results of a single-story and two-story frame. Then, the finite element modeling method was applied to study the collapse resistances of multi-story frame structures with different stories and spans. The load–displacement response, internal force development, deformation characteristics, and resistance mechanisms were analyzed, and the contributions of the flexural and catenary mechanisms of each story were separated quantitatively. The results illustrated that the VA can improve the load-carrying capacity to a certain extent in the small deformation stage, but can also cause the frame structures to undergo progressive collapse from the failure story to the top story. The bearing capacity of the multi-story frame did not have a simple multiple relationship with the number of stories. Increasing the number of spans can improve the collapse resistance in the large deformation stage, which is more obvious when the number of stories is smaller, and this accelerates the upward transmission of the axial tension force among the stories, although this effect is minimal for frames with few stories.
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