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Dissertations / Theses on the topic 'Multi-phase DC'

Author: Grafiati

Published: 23 November 2024

Last updated: 31 July 2025

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1

Jacobs, Joseph [Verfasser]. "Multi-Phase Series Resonant DC-to-DC Converters / Joseph Jacobs." Aachen : Shaker, 2006. http://d-nb.info/1166513211/34.

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2

Warnasooriya, Nilanthi. "Quantitative phase imaging microscopy with multi-wavelength optical phase unwrapping." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002637.

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3

Rakgati, Edward Tshitshiri. "Torque Performance of Optimally Designed Multi-Phase Reluctance DC Machines." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1174.

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4

Qin, Ruiyang. "Study on Three-level DC/DC Converter with Coupled Inductors." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73169.

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High power multi-level converters are deemed as the mainstay power conversion technology for renewable energy systems including the battery storage system, PV farm and electrical vehicle charge station. This thesis is focused on the study of three-level DC/DC converter with multi-phase interleaved structure, with coupled and integrated magnetics to achieve high power density. The proposed interleaved phased legs offer the benefit of output current ripple reduction, while inversed coupled inductors can suppress the circulating current between phase legs. Compared with conventional non-interleav

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5

Mazumder, Sudip K. "Nonlinear Analysis and Control of Standalone, Parallel DC-DC, and Parallel Multi-Phase PWM Converters." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28690.

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Applications of distributed-power systems are on the rise. They are already used in telecommunication power supplies, aircraft and shipboard power-distribution systems, motor drives, plasma applications, and they are being considered for numerous other applications. The successful operation of these multi-converter systems relies heavily on a stable design. Conventional analyses of power converters are based on averaged models, which ignore the fast-scale instability and analyze the stability on a reduced-order manifold. As such, validity of the averaged models varies with the switching freque

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6

Liu, Changrong. "A Novel High-Power High-Efficiency Three-Phase Phase-Shift DC/DC Converter for Fuel Cell Applications." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26048.

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Fuel cells are a clean, high-efficiency source for power generation. This innovative technology is going to penetrate all aspects in our life, from utility distributed power, transportation applications, down to power sources for portable devices such as laptop computer and cell phones. To enable the usage of fuel cell, developing power converters dedicated for fuel cells becomes imminent. Currently, the full-bridge converter is the dominating topology in high power dc/dc applications. Although multiphase converters have been proposed, most of them are dealing with high input-voltage systems,

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7

Mupambireyi, Ushindibaba. "Modelling, analysis and control of multi-phase electronically commutated DC machines : an enabling topology for DC converter fed networks." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101516/.

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Multiphase electronically commutated dc machine is a new non-conventional machine and converter topology aimed at dc power generation and delivery systems. This thesis presents a detailed analysis of two multiphase electronically commutated dc machine topologies, firstly, the two level topology then the multilevel topology. Electronic current commutation processes in these topologies are analysed and electrical machine parameters that influence current commutation and the design of the electronic commutator are exposed. The behaviour of the power electronic commutator circuit is shown to be ti

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8

Zhu, Huiyu. "New Multi-Phase Diode Rectifier Average Models for AC and DC Power System Studies." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/30188.

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More power semiconductors are applying to the aircraft power system to make the system smaller, lighter and more reliable. Average models provide a good solution to system simulation and can also serve as the basis to derive the small signal model for system-level study using linear control theory. A new average modeling approach for three-phase and nine-phase diode rectifiers with improved ac and dc dynamics is proposed in this dissertation. The key assumption is to model the load current using its first-order Taylor Series expansion throughout the entire averaging time span. A thorough compa

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9

Kim, Jong Wan. "Back to Back Active Power Filter for Multi-Generator Power Architecture with Reduced dc-link Capacitor." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96638.

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Multi-pulse converters have been widely used for a multi-megawatt scale power generating system to comply with harmonic regulations. Among all types of multi-pulse converters, a 12-pulse converter is the most widely used due to the simple structure, which consists of a delta-delta and a delta-wye phase-shift transformer pair and it effectively mitigates undesirable harmonics from the nonlinear load. In the early 2000s, a shunt type passive front-end for a shipboard power system was proposed. By shunting the two gensets with 30° phase angle difference, a single phase-shift transformer effecti

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10

Louganski, Konstantin P. "Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/35514.

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A DC power distribution system (PDS) of a transport aircraft was modeled and analyzed using MATLAB/Simulink software. The multi-level modeling concept was used as a modeling approach, which assumes modeling subsystem of the PDS at three different levels of complexity. The subsystem models were implemented in Simulink and combined into the whole PDS model according to certain interconnection rules. Effective modeling of different scenarios of operation was achieved by mixing subsystem models of different levels in one PDS model. Linearized models were obtained from the nonlinear PDS model f

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11

Young, Kurt A. "COMPARATIVE ANALYSES OF MULTI-PULSE PHASE CONTROLLED RECTIFIERS IN CONTINUOUS CONDUCTION MODE WITH A TWO-POLE LC OUTPUT FILTER FOR SURFACE SHIP DC APPLICATIONS." Monterey, California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/32924.

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The Navy of tomorrow will require a robust and reconfigurable power system capable of supplying power not only to large high power propulsion loads but to growing combat system loads like high power radar and pulse loads such as rail guns and free-electron lasers. A critical component in such a system is the phase controlled rectifier. As such, the issues associated with the inclusion of a power electronics rectifier need to be addressed. These issues include input Alternating Current (AC) interface requirements, the output Direct Current (DC) load profile, and overall stability in the presenc

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12

Voss, Johannes [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and H. Alan [Akademischer Betreuer] Mantooth. "Multi-megawatt three-phase dual-active bridge dC-dC converter : extending soft-switching operating range with auxiliary-resonant commutated poles and compensating transformer saturation effects / Johannes Voss ; Rik W. de Doncker, H. Alan Mantooth." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1217788972/34.

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13

Nonet, Olivier. "Conception d’amplificateurs de puissance haut rendement en technologie MMIC pour applications radiocommunication 5G." Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0037.

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Les réseaux modernes de radiocommunication utilisent des signaux modulés complexes à forte eﬃcacité spectrale et oﬀrent des débits de donnés importants avec en contrepartie, des facteurs de crête élevés. Ce dernier paramètre dégrade fortement le rendement moyen des ampliﬁcateurs, la dissipation thermique est de fait augmentée limitant ainsi les perspectives de miniaturisation, de réduction des coûts et de ﬁabilité des ampliﬁcateurs. Ce travail présente la conception d’un ampliﬁcateur de puissance RF >40W en bande L/S miniaturisé. Ce composant a spéciﬁquement été réalisé pour être compatible

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14

DIANA, MICHELA. "Tooth-coil wound multiphase synchronous machines." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2713044.

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Nowadays we are witnessing a strong growth in the full electric vehicle market. In the field of traction the requirements are low weight, small dimensions and low cost, without renouncing reliability and good performances. The high power density requirement is pushing the research towards integrated drive solutions. A particular drive that allows to obtain more insightful integrated solutions is the multi-phase one. In fact, in multi-phase structures it is possible to realize a converter as a combination of standard modules with an equal subdivision of the current. The resulting power e

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15

Khmaladze, Alexander. "Three-dimensional microscopy by laser scanning and multi-wavelength digital holography." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002638.

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16

Cheng, Sheng-Wen, and 鄭勝文. "Design and Implementation of a Multi-Phase Buck DC-DC Converter for Blade Servers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/46655847937705213867.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>In this thesis, a digitally-controlled voltage regulation module (VRM) which is fully compliant with Intel® VR12.5 specifications is implemented. In the presented system, a four-phase buck converter topology is adopted. An IR3581 dual-loop digital multi-phase buck controller is utilized as the digital controller, and IR3578 integrated synchronous buck driver IC is used to implement the power stage. Advantages of using a digital controller and integrated driver chip include fewer peripheral components and high design flexibility. Main features of IR3581 control

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17

Kang, Zhe-Wei, and 康哲維. "Study of a Multi-Phase Isolated DC/DC Converter for PEM Fuel Cell Stacks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/33731010025977904061.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>98<br>Recently, clean energy resources, such as wind turbines, photovoltaic systems or fuel cells, have been exploited for developing renewable electric power generation systems. Among them, the rapid advances in fuel cell technology have enabled the significant developments in fuel cell power system. The fuel cells feature numerous advantages, such as high energy density, high current output ability, and high-efficiency operation. However, the fuel cell stacks present a low voltage output and a wide range of voltage variations under different load, temperature, humi

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18

Tsai, Chia-Hao, and 蔡家豪. "Study of a 10kW Multi-Phase Digital-Controlled DC/DC Converter for Fuel Cell Applications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/c2h6a2.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>99<br>Recently, clean energy resources such as solar cell, wind turbine or fuel cell have been exploited for developing renewable electric power generation systems. The fuel cell is considered as the most clean energy technology. Its major advantages include low noise, low pollution, high efficiency, and easy replacement. However, the fuel cell stacks present low voltage output and wide range of voltage variation. In order to provide load a constant source, a step-up DC-DC converter must be inserted between the fuel cell stack and the load. In this thesis, the adopte

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19

Lin, Li-Chia, and 林立家. "Improved Dual Phase Cross-Coupled Charge Pump Techniques for Selectable Multi-Output DC-DC Converters." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/80030758925497407331.

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碩士<br>國立交通大學<br>電機與控制工程系所<br>96<br>LCD panels are going more and more popular. The applications of the LCD panels are widely spread in our daily life. From the small LCD panels on palmtop entertainment machine and cell phone to the large LCD panels on LCD TV or outdoor display screen. Therefore, the power supply blocks for LCD panels are more and more important. The needs to integrate the power supply block into the LCD driver circuits are rise in great demands. In other words, it is necessary to reduce the size of the power supply block chip and reduce the number of the external components.

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20

Feng, Yi-Hsin, and 馮毅昕. "Three-Phase Multi-Level Y-Y Connection Bi-Directional Series-Series Resonant DC-DC Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9ucj8t.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>This thesis presents Three-Phase Multi-Level Y-Y connection Bi-Directional Series-Series Resonant DC-DC Converter. The voltage stress of the power switch is equal to half of the input voltage. Therefore, it is suitable for high input-voltage applications, and is easy to choose the power switch device, it also has the benefit of reducing output voltage and current ripple. This article will introduce the principle of Three-Phase Multi-Level Y-Y connection Bi-Directional Series-Series Resonant DC-DC Converter. On secondary side, synchronous rectification is added

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21

Cao, Ke. "Thermal Management for Multi-phase Current Mode Buck Converters." Thesis, 2011. http://hdl.handle.net/1807/29498.

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The main goal of this thesis is to develop an active thermal management control scheme for multi-phase current mode buck converters in order to improve the long term reliability of the converters. A thermal management unit (TMU) with independent linear compensators for the thermal loops is incorporated into the existing digital controller to regulate the current through each phase so that equal temperature distribution is achieved across all phases. A lumped parameter thermal model of the multi-phase converter is built as the basis of the TMU. MATLAB simulation results are used to verify the T

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22

"Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46206.

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abstract: A 4-phase, quasi-current-mode hysteretic buck converter with digital frequency synchronization, online comparator offset-calibration and digital current sharing control is presented. The switching frequency of the hysteretic converter is digitally synchronized to the input clock reference with less than ±1.5% error in the switching frequency range of 3-9.5MHz. The online offset calibration cancels the input-referred offset of the hysteretic comparator and enables ±1.1% voltage regulation accuracy. Maximum current-sharing error of ±3.6% is achieved by a duty-cycle-calibrated delay lin

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23

Cheng, Ching-Hsiang, and 鄭景翔. "Novel Isolated Multi-Phase High Step-Up Voltage Ratio DC Converters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/83727561076548186122.

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碩士<br>國立清華大學<br>電機工程學系<br>100<br>High step-up voltage ratio DC converters are widely used in a variety of high voltage applications such as the front-end stages of uninterruptible power systems and distributed energy systems. Also, for safety reasons, galvanic isolation is essential. Although one can use high turns ratio transformer and/or coupling inductors to achieve high step-up voltage ratio, however, the resulting high voltage stress and decreased efficiency are the major drawbacks. Hence, in this thesis, a different approach is employed to achieve high step-up voltage ratio without relyi

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24

Chang, Bor-Min, and 張博民. "Research of Three-Phase Multi-Pulse AC to DC Diode Rectifiers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/19582960243031392378.

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碩士<br>國立成功大學<br>電機工程學系<br>89<br>In this thesis, techniques of multi-pulse diode rectifiers are analyzed. The multilevel voltage source converters, the input voltages of the rectifier are modified to approximate sinusoidal waves. As a result, the current flows through the inductor connected between ac source and the rectifier approximates the sinusoidal wave. In phase-shifted multi-pulse converters, transformers or autotransformers are used to change the phases of the input voltages, more than two sets of voltage sources are generated such that the input current harmonic components are reduced.

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25

Lukic, Zdravko. "Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters." Thesis, 2012. http://hdl.handle.net/1807/33855.

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The main goal of this thesis is to develop practical digital controller architectures for multi-phase dc-dc converters utilized in low power (up to few hundred watts) and cost-sensitive applications. The proposed controllers are suitable for on-chip integration while being capable of providing advanced features, such as dynamic efficiency optimization, inductor current estimation, converter component identification, as well as combined dynamic current sharing and fast transient response. The first part of this thesis addresses challenges related to the practical implementation of digital cont

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26

Hsu, Lan-Ting, and 許嵐婷. "Modeling and Control of a Multi-Phase Step-Up DC/DC Converter with Low Switch Voltage Stress." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33656679231194366909.

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碩士<br>國立清華大學<br>電機工程學系<br>96<br>In recent years, with global energy shortage and strong environmental movements, many countries are encouraging and promoting the development of distributed energy sources such as fuel cells and renewable energies. As important roles in new energy, however, the output voltage of the solar cells and the fuel cells is rather low. Hence, a high step-up dc/dc converter is normally required as an interface to increase voltage for back-end applications. Therefore, emphasis of this thesis is placed on developing a high efficiency and high step-up dc/dc converter for th

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27

CHEN, YUNG-HAN, and 陳永翰. "A High Efficient Switch Mode DC-DC Converter with a Multi-Phase Periodic Shut Down Switch-On-Demand Modulator." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y7w4k8.

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28

Luo, Zhixiang. "A multi-featured single-phase utility interface with reduced DC link capacitor for distributed power sources." Thesis, 2004. http://spectrum.library.concordia.ca/8397/1/MR04385.pdf.

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The traditional, regulated electric power systems are based on large power generation plants located far from load centers. In a deregulated market, however, small and environmentally friendly power plants using wind power, photovoltaic cells, fuel cells and micro-turbines can be installed through a given distribution system. This concept of distributed generation tends to reduce the cost of electricity and to reduce or postpone major investments in the transmission system. Many of these small power plants are typically consumer owned and are connected to the utility grid by means of single-p

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29

Lin, Ting-Yueh, and 林廷岳. "The Research of Applying Multi-Order Sliding ModeController in Three Phase Brushless DC Motor to RejectDisturbance." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/94516058984458985918.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>105<br>In this paper, first, we explain the fundamental theory and operation mode of DC motors and brushless DC motors. We explain the six-step square wave drive method of brushless DC motors by using the image and control method PWM (Pulse Width Modulation) drives the motor. Including thr detection method of commutation points, hall sensor detection and sensorless detection. The important part in the paper is current control and rotor speed control using the high-order SMC (Sliding Mode Controller).We use the one-order SMC to control the current and simultaneously

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30

"An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.46244.

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abstract: High-efficiency DC-DC converters make up one of the important blocks of state-of-the-art power supplies. The trend toward high level of transistor integration has caused load current demands to grow significantly. Supplying high output current and minimizing output current ripple has been a driving force behind the evolution of Multi-phase topologies. Ability to supply large output current with improved efficiency, reduction in the size of filter components, improved transient response make multi-phase topologies a preferred choice for low voltage-high current applications. Current

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