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Dissertations / Theses on the topic 'Ripple voltage'

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Published: 4 June 2025

Last updated: 1 August 2025

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1

Vujacic, Marija <1991&gt. "Dc-link current and voltage ripple analysis in single-phase and multiphase voltage source inverters." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9046/1/Marija_Vujacic_IBES.pdf.

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Dc-link switching and low-frequency current and voltage ripple components in two-level single-phase and multiphase voltage source inverters have been analyzed in this thesis. Voltage ripple components are calculated based on the corresponding dc-link current components and by considering a non-ideal dc voltage source, representing an input filter (such as a dc reactor) or a resistive dc supply (such as a PV system). However, switching ripple analyses are also valid in most of the dc power supplies since the dc source impedance usually becomes much higher than the dc-link capacitor reactance at

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2

Vlček, Pavel. "Lineární aktivní filtr napájecího napětí „Ripple Blocker“." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221086.

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This work deals with a methods for increasing the PSRR of the linear active filters of supply voltage or if linear regulators and voltage range of supply, primarily his minimal value. In the work are used ideal parts of reference voltage source and reference current source. The work describes how to eliminate effect of feedback loop on the PSRR, how to decrrease minimal power supply voltage and how to set stability of total schematic.

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3

Li, Chen. "State Space Modeling and Power Flow Analysis of Modular Multilevel Converters." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71811.

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For the future of sustainable energy, renewable energy will need to significantly penetrate existing utility grids. While various renewable energy sources are networked with high-voltage DC grids, integration between these high-voltage DC grids and the existing AC grids is a significant technical challenge. Among the limited choices available, the modular multi-level converter (MMC) is the most prominent interface converter used between the DC and AC grids. This subject has been widely pursued in recent years. One of the important design challenges when using an MMC is to reduce the capacitor

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4

Häger, Emil. "Performance Evaluation of Medium-Power Voltage Inverters." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118568.

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Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design

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5

Chen, Rui. "Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51664.

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Power Factor Correction rectifiers are widely adopted as the first stage in most grid-tied power conversion systems. Among all PFC converts for single phase system, Boost PFC is the most popular one due to simplicity of structure and high performance. Although the efficiency of Boost PFC keeps increasing with the evolution of semiconductor technology, the intrinsic feature of high output voltage may result cumbersome system structure with multiple power conversion stages and even diminished system efficiency. This disadvantage is aggravated especially in systems where resonant converters are s

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6

Vadivelu, Sunilkumar. "Investigation of sinusoidal ripple current charging techniques for Li-ion cells." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195169.

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In recent years, the demand for Li-ion-type batteries has been increasing significantly in various fields of applications including portable electronics, electric vehicles, and also in renewable energy support. These applications ask for a highly efficient charging strategy in order to maintain a long life cycle of the batteries. Recently, a new charging technique referred as sinusoidal ripple current-constant voltage charging (SRC-CV) technique has been proposed and is in certain publications claimed to realize an improved charging per-formance on Li-ion batteries than conventional constant-c

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7

Faktor, Richard. "Kvalita napětí v DC sítích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316940.

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This diploma thesis deals with elektrical power quality in DC grids. Electrical power is commodity and therefore it must be represented not just with quantitative, but also with qualitative parameters. Nowadays, there is an increasing demand for bigger implementation of renewable energy sources and more efficient power systems, which motivates installation of DC grids. However, development of DC grids is decelerated by lack of standardization alson in power quality. The work includes definition of power quality parameters and their measurement methodology.

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8

Eleyele, Abidemi Oluremilekun. "Isolated Single-Stage Interleave Resonant PFC Rectifier with Active and Novel Passive Output Ripple Cancellation Circuit." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423117.

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With the increasing demand for fast, cheaper, and efficient power converters come the need for a single-stage power factor correction (PFC) converter. Various single-stage PFC converter proposed in the literature has the drawback of high DC bus voltage at the input side and together with the shift to wide bandgap switches like GaN drives the converter cost higher. However, an interleaved topology with high-frequency isolation was proposed in this research work due to the drastic reduction in the DC bus voltage and extremely low input current ripple thereby making the need for an EMI filter cir

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9

Etesami, Mohammadhossein. "On metaheuristics for design and modulation of multilevel inverters." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132309/1/Mohammadhossein%20Etesami%20Thesis_Redacted.pdf.

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Multilevel inverters are introduced as a promising technology for high voltage applications. Associated design limits and control complexities hinder the wide use of multilevel converters. Motor drive overall efficiency is largely affected by the applied modulation technique. Selective Harmonic Elimination (SHE) Pulse Width Modulation (PWM) is a modulation technique which gives an excellent outcome suppressing low-order detrimental harmonics. Solving of the associated highly nonlinear equation set in SHE PWM has been one of the widely discussed numerical problems in power electronics. Three ke

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10

Senturk, Osman Selcuk. "Series Active Filter Design, Control, And Implementation With A Novel Load Voltage Harmonic Extraction Method." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608819/index.pdf.

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Series Active Filters (SAF) are designed for harmonic isolation and load voltage regulation of single-phase and three-phase voltage harmonic source type nonlinear loads. The novel Absolute Value Method (AVM) for load voltage harmonic extraction is proposed and applied in the control algorithm of SAF. The SAF compensated systems are represented by simplified linear models such that SAF controller gains can be easily determined. Harmonic isolation and load voltage regulation performances of 2.5 kW single-phase and 10 kW three-phase SAF compensated systems are evaluated by detailed simulations. L

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11

Terçariol, Walter Luis 1975. "Contribuição ao projeto de circuitos integrados de reguladores de tensão com charge pump em tecnologia CMOS : aceleração do tempo de partida, redução do ripple, redução do efeito kick-back e técnica indireta de medida da tensão de saída." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260876.

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Orientador: José Antonio Siqueira Dias<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-26T13:53:46Z (GMT). No. of bitstreams: 1 Tercariol_WalterLuis_D.pdf: 1322557 bytes, checksum: 4f45518a1a62907cd9a61afa627408c3 (MD5) Previous issue date: 2014<br>Resumo: Este trabalho visa compilar três contribuições na melhoria dos projetos de reguladores de tensão com unidades de bombeamento de carga embutidos (células elevadoras de tensão Dickson - BC). A primeira aborda uma técnica inovadora de arranque na

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12

Barbagallo, Mariano. "HV Interleaved Multiphase DcDc Buck-Boost Converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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in electric vehicle (ev) systems, bi-directional dc-dc converters are used to interface the rechargeable energy storage system (ress) such as the battery bank with the high voltage dc-link of the inverter. currently multi-cell batteries used in automotive systems, such as ev or hev, are subject to a higher failure rate than single cell batteries. the more cells are used in series, the greater the opportunities to fail and the worse the reliability. when a cell has failed the entire string or even worse the battery must be replaced, which is extremely costly [1]. so, to have less cells in serie

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13

Giral, Castillón Roberto. "Síntesis de estructuras multiplicadoras de tensión basadas en células convertidoras continua-continua de tipo conmutado." Doctoral thesis, Universitat Politècnica de Catalunya, 1999. http://hdl.handle.net/10803/6329.

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Uno de los campos más importantes de la Electrónica de Potencia es el de los convertidores de potencia conmutados, que debido a sus características de alto rendimiento energético, reducido tamaño, posibilidades de regulación del factor de potencia y de elevación de tensión, etc., están presentes en un gran número de las etapas de alimentación de los equipos electrónicos actuales.<br/>Las mejoras tecnológicas en ámbitos como el de la integración de circuitos han permitido importantes reducciones en el tamaño de los equipos (por ejemplo en los ordenadores). Sin embargo, este proceso de reducción

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14

Bisulli, Lorenzo. "Progetto e analisi di tecniche di modulazione pwm per inverter trifase." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21387/.

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Lo scopo della tesi era quello di analizzare vari parametri delle principali modulazioni PWM per inverter trifase in modo da distinguere quali fossero le più efficienti o le più affidabili. A tale scopo, è stata dapprima effettuata una panoramica dell’inverter trifase e delle relative modulazioni. Sono stati quindi scritti vari codici in Matlab per simulare le diverse tecniche di modulazione. Le modulazioni presentate in questo testo (con i rispettivi codici) sono: Sinusoidal PWM, THIPWM, SVPWM, DSVPWM (0,1,2,3,+,-), ASDSVPWM, Six-step (implementata solo per effettuare un confronto). Al term

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15

Nguyen, Tam Khanh Tu. "Evaluation of Active Capacitor Banks for Floating H-bridge Power Modules." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/104466.

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The DC-side floating capacitors in the floating power modules of power converters are subject to high voltage fluctuation, due to the presence of reactive harmonic components. Utilizing passive capacitors, as done in traditional methods, helps reduce the DC-bus voltage ripple but makes the system bulky. An active capacitor can be integrated with the floating H-bridge power modules to remove the effect of the ripple powers on the DC bus. The auxiliary circuit, which is much smaller in size compared to an equivalent passive capacitor, helps increase the power density of the system. This work foc

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16

Ming, Wen-Long. "Active control of voltage ripples in power electronic converters." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12343/.

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Two major challenges, i.e., bulky electrolytic capacitors and isolation transformers, remain as critical obstacles for further improvement on reliability, power density and efficiency of power electronic converters, which are mainly used to reduce low-frequency voltage ripples and high-frequency common-mode voltage ripples, respectively. In order to overcome the two challenges, the most straightforward way is to simply combine existing solutions developed for each of them. However, this would considerably increase system complexity and cost, which should be avoided if possible. In this thesis,

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17

Ranlöf, Martin. "Electromagnetic Analysis of Hydroelectric Generators." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-146629.

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Hydropower maintains its position as the most important source of renewable electric energy in the world. The efficiency of large hydropower plants is unsurpassed, and after more than hundred years of development, the technology is mature and highly reliable. While new hydro resources are currently being developed in Asia and South America, most European countries go through a phase of intense refurbishment and upgrading of existing plants. Challenges faced by the hydropower industry include a knowledge transfer to new generations and the adaptation of unit designs to meet new operational requ

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18

Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/278.

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A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals fo

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Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/278.

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A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals for

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20

Tuffaha, Mutaz, and Dhafer Yahia Saleh. "Control Strategy for a DC/DC Buck Converter based on a Hamiltonian Model to suppress the Ripples at the Input stage." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-12111.

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AC/DC Buck converters have been used widely in many applications from cell phones to vehicle battery chargers. Due to their importance many researchers have been studying their behavior to improve their efficiency and reduce their size and/or cost. One of the most common defects of these converters, whether they are used for high power or low power applications, is the unwanted ripples in the input voltage across the input stage. It is believed that these ripples are caused by the interaction between the converter itself or its controller with the rectifier required to change the AC input into

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21

Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. https://etd.iisc.ac.in/handle/2005/139.

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In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. Th

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Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. http://hdl.handle.net/2005/139.

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In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. Thes

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23

Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.

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The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied

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24

Meng, Tien-Hsiang, and 孟天祥. "Low Ripple Voltage and High Transient Response Ripple-Based Buck Converter Design." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/96600155374452631883.

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碩士<br>國立中央大學<br>電機工程學系<br>105<br>As designs of portable electronic products are developed toward being light, thin, short, small and multi-functional, making the power consumption and power density of the products are relatively increased. While using a variety of product features, it also represents that a large amount of load changes is required, especially when using communication network functions. The development of power management chips have become saturated because of the technology of high conversion efficiency, and gradually develop toward the rapid response and high power density. O

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LIANG, CHI HO, and 梁期合. "Flyback PFC Converter with Low-Frequency Voltage Ripple Reduction." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/xgh9vy.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>This thesis studied two circuit topologies to reduce low-frequency output ripple voltage based on flyback power factor corrector (PFC). In the first topology, a reverse ripple voltage is produced by an Inverse-Buck convertor cascode at the output side to cancel the ripple. In the other topology, a bidirectional buck-boost converter is parallel-connected at the output to absorb/ supply power and thus reduce the ripple. Due to ripple reduction, small output capacitance can be used. Therefore, electrolytic capacitor is replaced by solid-state capacitor in the pro

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26

Chich-PinHu and 胡智斌. "Design and Implementation of a Low Ripple High Voltage Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/ppn8z9.

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碩士<br>國立成功大學<br>電機工程學系<br>104<br>The thesis proposes a low ripple high voltage converter applied in plasma field. The structure of the circuit combines conventional symmetry high voltage circuit and a parallel resonant circuit. Acircuit for high output voltage with low ripple can be achieved by canceling the high frequency from the charging and discharging of capacitors alternating signals from the parallel resonant circuit. The problem of higher output voltage ripple created in conventional high step up circuits can be improved. Many types of conventional voltage multiplier circuits and reson

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Huang, Chun-Yen, and 黃俊諺. "Improved Output Ripple Voltage of Soft-Switched Power Factor Correctors." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/77399995876959489707.

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碩士<br>義守大學<br>電機工程學系碩士班<br>96<br>It is difficult for conventional power factor correctors to achieve both high power factor and low output ripple voltage simultaneously. The general solution is to connect another converter in series. But the overall efficiency will be reduced significantly. The soft switching cells are public onfigurations to improve converterefficiency. However, in the past research, the energy of switching loss is transferred to the soft switching cells, and then fed to the load directly. The uncontrolled energy may impact the ripple of the output oltage. Therefore, this the

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28

Hsiao, Li-yang, and 蕭立揚. "Single-Stage PFC Flyback Converter with Low Output Voltage Ripple." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/rk83qj.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>97<br>An auxiliary winding with an associated capacitor is added on the single-stage power factor corrector (PFC) based on fly-back conversion to reduce the ripple on the dc output voltage. The associated capacitor takes out partial energy at every switching cycle from the fly-back conversion and releases the stored energy to the load at the valley of the rectified line voltage. The negative effect of such an approach is that the converter does not draw a current from the AC line at the lower voltage near zero crossing, leading to deterioration in the power factor.

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29

Liao, Chi-Shun, and 廖繼順. "Minimum Output Ripple Voltage Control for Three Phase Active Rectifier Under Unbalanced Input Voltage Condition." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/63861876391392309306.

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碩士<br>國立清華大學<br>電機工程學系<br>93<br>Theoretically, a three-phase boost rectifier can be controlled to achieve unity power factor as well as clean sinusoidal current at the input and zero voltage ripple at the output. Hence, it is now gradually replacing the traditional thyristor rectifiers to avoid power pollution problems. However, the ideal characteristic of the boost rectifier will be lost when the boost rectifier is operated under unbalanced three-phase voltage source. Hence, many control methods were proposed to solve this problem in the existing literature. Nevertheless, these methods, altho

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Liao, Keng-Hung, and 廖耿宏. "Current Ripple Reduction for LLC Converters with Voltage Doubler Rectifier in High Output-Voltage Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/10306680401201380809.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>Employing Taiwan Tech voltage doubler, an enhanced LLC resonant converter (LLC-TVD) is proposed. In addition to having zero-voltage switching operation on the MOSFETs and zero-current switching on the rectifier diodes inherited from its predecessor, the proposed converter has several additional features. For instance, the rectifier diodes are clamped to the output voltage, the transformer secondary leakage energies are recovered, and the output filer is used without filter inductor. Moreover, a smaller transformer secondary-to-primary turns-ratio can be used.

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Lee, Yu-chia, and 李玗家. "High Efficiency Current Sensing Buck Converter with Output-Ripple-Voltage Control for Dynamic Voltage Scaling." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/69738580599963660393.

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碩士<br>國立中央大學<br>電機工程研究所<br>98<br>The design of portable electronic devices is toward to the multi-function intelligent cell phone. When all functions integrated to one system, the power management is very important. On the one hand, the high transfer efficiency power chip design has been developed very well. On the other hand, according to most of the time, the electronic device is operated in low-power mode, the power management chip must adjust its loading and output voltage level according to the needs. Hence, it can lower the power consumption much more efficiently. As the result, the powe

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Liou, Jhan-Jhih, and 劉展志. "Voltage ripple rejection on DC/DC converter in the photovoltaic system." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/01708446842401865855.

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碩士<br>國立交通大學<br>機械工程學系<br>101<br>The purpose of this thesis is to provide a control strategy to deal with the instantaneous second harmonic power phenomenon of a grid connected photovoltaic system (PV system). The PV system can be classified into two types according to its number of power conversion stages. The first type of PV system is single-stage and the other is multiple-stage. In this thesis, the PV system which we discuss is a dual-stage system. It composes of a DC/DC converter and an inverter. In dual-stage PV system, it converts the dc power from the photovoltaic array (PV array) to d

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Lee, Yi-Ting, and 李奕廷. "A Step-Down DC-DC Converter with Low Output Voltage Ripple." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/33266615018978222264.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>97<br>Power management circuit, such as DC-DC converter, is widely used in electronics to convert power supply to a required stable output voltage for electric circuits. Therefore, there is an increasing demand for the DC-DC converters with high efficiency, high accuracy, and low cost. Switching regulators have the advantages of wide load current range and high efficiency, but their inevitable output ripples is a problem for noise-sensitive analog circuit. On the other hand, linear regulators ideally have no output voltage ripple, but their efficiency drop signifi

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Chou, Chia-Wei, and 周嘉緯. "Three-phase Interleaved Boost Converter with Low-Frequency Voltage Ripple Reduction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82510715613384396040.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>104<br>This paper proposed a triangular current mode (TCM) control to implement three-phase interleaved boost converter for suppression the output low-frequency voltage ripple. This paper introduces the band-stop filter into the feedforward control to improve the traditional control method for ripple reduction, after adding this control method can cancel low-frequency output voltage ripple to 30 % of the original at full load; the electrolytic capacitor that requires the storage energy is dropped from 1.98 mF to 630 μF to meet the voltage ripple is 6 V requirement at

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Guo, Yu-Jie, and 郭宇傑. "Minimization of Output Voltage Ripple for Fully-Digitalized Interleaved Buck Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/b49aev.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>97<br>In this thesis, minimization of the output voltage ripple is presented based on the pulse width modulation (PWM) along with the pulse amplitude modulation (PAM), and applied to a DC-DC buck converter with the input voltage of 48V±20% and the rated output voltage of 12V. This system is implemented by two converters cascaded. The first-stage converter is a buck-boost converter used to regulate the output voltage of the second stage; the second-stage converter is an interleaved two-phase buck converter used to offer a large output current. In theory, if the duty

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Jun-MinJian and 簡君珉. "High Step-Down DC-DC Converter with Low Output Voltage Ripple." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2v3zrm.

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碩士<br>國立成功大學<br>電機工程學系<br>107<br>With the advancement of technology, people's behavior is stored in the cloud, which is becoming a part of information in big data. The place where the big data stored has consumed 3 % of the world's electricity consumption every year, about 400 terawatts hours, which is higher than the electricity consumption of about 300 terawatts hours per year in the United Kingdom. Google proposes a new power architecture with 48 V to point-of-load design to reduce the huge consumption from data center. After transferring to POL voltage from 48 volt, the two stage conversio

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CHENG, CHUN-YUAN, and 鄭竣元. "The Research on High-Efficiency Low-ripple-voltage CMOS Regulated Charge Pump." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/85874808790585503910.

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CHU, YEN-JUI, and 朱彥睿. "The design of CMOS high-efficiency low-ripple-voltage regulated charge pump." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/64223771565188913678.

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Xie, Fu-Yan, and 謝府諺. "Design and Implementation of Low Ripple Switched-Capacitor DC-DC Voltage Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6q6875.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>106<br>A Switched-Capacitor Voltage Regulator (SCVR) featured high conversion ratio and the small area can be used as an on-chip voltage regulator. SCVR''s operation uses the capacitor as a medium of voltage conversion causes ripple and power loss on loading side. In addition, the ripple will cause power supply noise that reduces the stability of sub-circuits. Therefore, we propose a low-ripple and high-efficiency design of SCVR. First, we focus on the analysis of SCVR design operation theory and the relationship between ripple and SCVR''s pa

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LIU, WEI-PO, and 劉韋伯. "Implementation of Resonant Converter with Wide Input Voltage and Low Current Ripple." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/pvwt32.

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碩士<br>國立雲林科技大學<br>電機工程系<br>106<br>Resonant converter with wide input voltage and low current ripple is proposed in this thesis, and applied to low input voltage and high voltage output systems such as fuel cells and renewable energy. The proposed circuit is a two-stage architecture. A conventional boost topology is employed in the ﬁrst stage to increase the input voltage range and a current-fed resonant converter adopted in the second stage for galvanic isolation and dc/dc conversion. The second stage topology are combined with an interleaved boost and a full-bridge LLC resonant converter, to

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Wu, Chun-Hsien, and 巫浚賢. "A Step-Up/Step-Down DC-DC Converter with Low Output Voltage Ripple." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/74276603358233277331.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>97<br>More and more battery-powered portable electronic products are introduced to the market in recent years. However, since the battery voltage typically decreases with time, a DC-DC converter is required to convert the time-varying battery voltage to a stable output voltage for the electronic circuits. This work implemented a versatile step-up/step-down dc-dc converter, which can convert a varied input voltage to a fixed 3.3V output voltage. The converter actually consists of a charge-pump-based converter and a low dropout regulator (LDO). Because a clean suppl

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Ping-HsiangHuang and 黃鈵翔. "A Novel Low Ripple Converter with Interleaved Voltage Multiplier for X-ray Machine." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/06403365558885866847.

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碩士<br>國立成功大學<br>電機工程學系<br>104<br>The purpose of this study is to explore and implement a high voltage converter for X-ray machine. Currently, the X-ray machine have large output voltage ripple making the body and cause harm suffered increased X-ray imaging artifact influence doctors to determine shortcomings. In this thesis, an interleaved full-wave voltage multiplier which improve voltage ripple is proposed, its main concept is using two reverse voltage ripple in the way of superposition and cancellation so that the output voltage ripple is reduced, and finally develop a novel low ripple conv

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Liu, Bo-Cheng, and 劉伯成. "A Novel High Step-Down Voltage Ratio Converter with Low Output Current Ripple." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/13164899644504828200.

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碩士<br>國立清華大學<br>電機工程學系<br>101<br>Step-down DC converters are widely used in various applications such as server power、personal computer、VRMs of CPU boards and battery chargers. For higher step down ratio applications, the resulting output current of the above converters becomes rather large and often require a rather large output capacitor. Besides, when the step down ratio is too large, the corresponding switch duty cycle is required to operate at the threshold resulting in much high electric magnetic interruption. Furthermore, for higher power applications, the conduction losses of the conve

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Lee, Yung-Ta, and 李勇達. "Improvement of Low-FrequencyOutput Voltage Ripple of Single-StageHigh-Power-Factor Flyback Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/fa7tq3.

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碩士<br>國立臺北科技大學<br>電力電子產業研發碩士專班<br>102<br>In the thesis, a high-power-factor isolated power converter, combining the traditional buck-boost and flyback converters, is developed based on only one switch. Via suitable design of the voltage across the output capacitor of the buck-boost converter in the proposed circuit topology, not only the voltage stress on the switch but also the low-frequency output voltage ripple is reduced. Therefore, the proposed converter has a smaller low-frequency output voltage ripple than the traditional single-stage high-power-factor flyback converter. In addition, th

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Xu, Rong-Zhe, and 許榮哲. "The Research on High-Efficiency Low-Ripple-Voltage Highly Integrated CMOS RegulatedCharge Pump." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/85jjzs.

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碩士<br>國立雲林科技大學<br>電子工程系<br>107<br>This paper presents a high-efficiency low-ripple-voltage highly integrated CMOS regulated charge pump with fast start-up. The regulated charge pump is based on two charge transfer branches to provide low output ripple voltage and fast start-up. The related reversion loss is suppressed efficiently using first-level gate-control mechanism. The proposed regulated charge pump is designed in a TSMC 3.3-V 0.18-μm CMOS process. The circuit provides 30-mA load current and generates a well regulated 4.5-5V output voltage from a supply voltage of 3.3-V with a flying cap

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Jheng, Min-Cian, and 鄭閔謙. "Minimization of Output Voltage Ripple for Fully-Digitalized Interleaved Buck Converter with Active Clamp." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/25g5bu.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>98<br>In this thesis, a control technique combining pulse width modulation (PWM) and pulse amplitude modulation (PAM) is presented so as to make the output voltage ripple of the converter reduced as minimum as possible. Such a converter takes two-stage structure. The first stage is the active-clamped buck-boost converter which is used to adjust the output voltage of the second stage, whereas the second stage is the two-phase interleaved buck converter with active clamp based on only one resonant circuit is used to reduce the output voltage ripple. In theory, two p

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Wu, Geng-yi, and 吳耿毅. "A Self-Regulated Charge Pump with High Drive Current and Small Output Ripple Voltage." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/71309610072403955378.

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碩士<br>國立雲林科技大學<br>電子與資訊工程研究所<br>95<br>A self-regulated charge pump circuit is proposed. The charge pump exploits an automatic pumping control scheme to provide small output ripple voltage. The automatic pumping control scheme is composed of two schemes, an automatic pumping current control scheme and an improved automatic pumping frequency control scheme. We utilized a Range-programmable Voltage-controlled Oscillator which has four different frequency band outputs depended on load current value. The output frequency of the VCO varies from 400KHz to 10MHz. The improved automatic pumping frequen

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Wang, Chia-Che, and 王家哲. "The Voltage Ripple Rejection of DC/DC Converter in Photovoltaic Systems and DSP Implementation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/23887839348570964513.

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碩士<br>國立交通大學<br>機械工程系所<br>102<br>The purpose of this thesis is to use a control strategy to reject the second harmonic voltage ripple which the instantaneous second harmonic power produced of a grid-connected photovoltaic system. The photovoltaic system can be classified into two types. The first type of photovoltaic system is single-stage and the other is multiple-stage. In this thesis, we select the photovoltaic system which is a dual-stage system. The dual-stage system is composed of a front-stage DC/DC converter and an back-stage DC/AC inverter. In dual-stage PV system, it converts the dc

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LIN, ZIH-CI, and 林梓齊. "A Step-Down Flyback Converter with High Power Factor and Low Output Voltage Ripple." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32052974747094887766.

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碩士<br>國立雲林科技大學<br>電機工程系<br>104<br>A Step-Down Flyback converter with High Power Factor and Low Output Voltage Ripple is proposed in this thesis. An auxiliary winding and an auxiliary capacitor are added to the conventional single-stage flyback power factor corrector. It not only reduces the peak output current and output diode current stress, but also reduces the output voltage ripple. Since the auxiliary capacitor is in series with the input side, the input current waveform can be maintained nearly sinusoidal. It can avoid a serious distortion of the input current and a significant reduction

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Kao, Li-Huan, and 高立桓. "The DC-Link Voltage Ripple Cancellation Method for Three-Phase Grid-Tied PV Inverters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/3ns5f4.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>105<br>A new control method, the dc-link voltage ripple cancellation (DVRC), for three-phase grid-tied PV power systems is proposed to cancel the dc-link ripple during unbalanced grid conditions. When a grid fault occurs, the conventional PV inverter system will generate double-line frequency active/reactive power due to the unbalanced grid voltage. It causes the dc-link voltage fluctuating, which is bad for PV system''s stability. Moreover, the current injected to the grid may suffer from distortion. The objective of the proposed DVRC method is to cancel

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