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Dissertations / Theses on the topic 'Impedance convertor'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Wang, Jinhua. "A Wide Input Power Line Energy Harvesting Circuit For Wireless Sensor Nodes." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103426.

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Massive deployment of wireless IoT (Internet of Things) devices makes replacement or recharge of batteries expensive and impractical for some applications. Energy harvesting is a promising solution, and various designs are proposed to harvest power from ambient resources including thermal, vibrational, solar, wind, and RF sources. Among these ambient resources, AC powerlines are a stable energy source in an urban environment. Many researchers investigated methods to exploit this stable source of energy to power wireless IoT devices. The proposed circuit aims to harvest energy from AC power

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2

Haskou, Abdullah. "Contribution à l'étude des antennes miniatures directives ou large-bande avec des circuits non-Foster." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S043/document.

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Pour faire cohabiter les nombreuses technologies radios, les terminaux mobiles nécessitent une miniaturisation de plus en plus poussée des antennes. Toutefois, les performances d'antennes ont des limites fondamentales liées à leurs dimensions physiques. La littérature met en évidence que les réseaux superdirectifs permettent de dépasser la limite de Harrington sur la directivité et que des antennes adaptées par des circuits non-Foster peuvent dépasser la limite de Bode-Fano sur la bande passante. Les contributions essentielles de ce travail de thèse consistent en la conception deréseaux d'ante

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3

Tade, Oluwabunmi O. "Negative impedance converter for antenna matching." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4920/.

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This thesis describes research into Negative Impedance Converters (NIC) for antenna matching. There are many applications that require small wideband antennas, from mobile phones and devices which are being required to cover larger frequency bands to cognitive radios that are expected to operate within any frequency band with minimum reconfiguration. However, fundamental limits on antennas such as the Chu-Harrington and Bode-Fano restricts the bandwidths obtainable from small antennas and antennas matched using conventional Foster reactive elements. However, non-Foster elements realised using

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4

Cazzell, Gregory A. "Output Impedance in PWM Buck Converter." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1247006982.

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5

Cheong, Heng Wan. "Generalized impedance converter (GIC) filter utilizing composite amplifier." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FCheong.pdf.

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6

Zhang, Guidong [Verfasser]. "Impedance networks matching mechanism and design of impedance networks converters / Guidong Zhang." Hagen : Fernuniversität Hagen, 2015. http://d-nb.info/1079393064/34.

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7

Zhang, Xin. "Impedance control and stability of DC/DC converter systems." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13951/.

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Cascaded DC/DC converter systems (or 'cascaded systems') have instability problems; i.e., although the subsystems may work well individually, the whole system may be instable due to the impedance interaction among these subsystems. To solve this problem, a family of impedance-based stabilisation methods are proposed in this thesis. First, parallel-virtual-impedance (PVI) and series-virtual-impedance (SVI) control strategies are proposed to stabilise cascaded systems via shaping the load input impedance. Theoretically, the PVI or SVI control strategy connect a virtual impedance in parallel or s

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8

Quinalia, Mateus Siqueira. "Modelagem, análise de estabilidade e controle da tensão da malha Z em inversores fonte de impedância." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-04022019-091341/.

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O uso crescente de fontes alternativas de energia exige conversores de energia capazes de aumentar sua tensão nos terminais e conectá-los ao sistema de distribuição. Neste contexto, o conversor step-up clássico (conversor de potência CC/CC) e o inversor de fonte de tensão (VSI) são as soluções mais aplicadas para processar o fluxo de energia da fonte para a rede. No entanto, apresentam um baixo rendimento devido ao duplo estágio de conversão, isto é, a energia flui também através dos conversores de energia CC/CC e CC/CA. Para evitar esse tipo de desvantagem, no início da última década, o Z-Sou

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9

El, Hamoui Mohamad A. "A Pipeline Analog-To-Digital Converter for a Plasma Impedance Probe." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/287.

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Space instrumentation technology is an essential tool for rocket and satellite research, and is expected to become popular in commercial and military operations in fields such as radar, imaging, and communications. These instruments are traditionally implemented on printed circuit boards using discrete general-purpose Analog-to-Digital Converter (ADC) devices and other components. A large circuit board is not convenient for use in micro-satellite deployments, where the total payload volume is limited to roughly one cubic foot. Because micro-satellites represent a fast growing trend in satellit

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10

Wang, Xin. "Online health monitoring of photovoltaic panels by converter-based impedance spectroscopy." Electronic Thesis or Diss., Université de Lorraine, 2024. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2024_0039_WANG.pdf.

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Pour répondre aux besoins énergétiques croissants à travers le monde et dans un objectif de développement durable, l'utilisation de l'énergie solaire entraine une augmentation significative de l'installation de panneaux photovoltaïques (PV) permettant une production d'électricité propre et renouvelable. Cependant, les panneaux PV sont susceptibles de présenter des défauts dus aux menaces environnementales, aux facteurs humains ou à des périodes de fonctionnement prolongées. Ces défauts peuvent entraîner des pertes de puissance, une faible efficacité, une instabilité du système et présenter un

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11

Hynek, David. "Přenosný číslicově řízený stabilizovaný zdroj symetrického napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413121.

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This thesis deals with a design of a power supply for a measuring equipment for a geophysical mapping intended to do a reconstruction of an electrical impedance of a ground environment of water reservoirs. The power source is going to be used for laboratory measurements and for outdoor experiments. The thesis describes the selection of suitable components, equipment design and testing. The theoretical part explains the functions of used components and the principle of an electrical impedance tomography. The conclusion summarizes the properties of the proposed solution and evaluates the final p

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12

Mosunmola, Faloye Omolola. "Design and Implementation of A Three-Level Boost converter for Battery Impedance Spectroscopy." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32664.

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Lithium-ion batteries are the most are widely used as electrical storage device in various applications such as portable electronics, electric vehicles, Photovoltaic application, telecommunication etc due to the characteristics of the batterie such as high-power density, long cycling and high-power efficiency. Extensive condition monitoring of the battery should be implemented due to the usage of the battery so that there will be an increase in all the overall performance and expectancy. This research is focused on implementing an online condition monitoring on the Li-ion battery using a signa

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13

Aleem, Zeeshan. "Improvement in control and gain aspects of impedance source inverters and converters." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30328.

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Power electronics have revolutionized the concept of power control for power conversion and for control of electrical motor drives. Power electronics has been extensively used in industrial applications since it was first discovered in 1902. Power conversion is one of the most important and prominent applications of power electronics. Impedance source networks cover the entire spectrum of electric power conversions from DC-AC (e.g. inverters), to phase and frequency conversion (AC-AC) in a wide range of applications. A wide variety of topologies and control methods using different impedance so

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14

Kubát, Pavel. "Analogové elektronické emulátory obvodů neceločíselného řádu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442475.

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Diploma thesis deals with circuits contain fractional-order elements. The first part of this paper deals with this problem, there were also described methods of design fractionalorder elements and types of circuits containing the fractiona-order elements which can be applied in practice. Used active elements for practical part can be found in the second chapter. Design of GIC circuits and implementation of fractional-order element inside the circuit are shown in the last chapture. Parasitic analysis and stability of frequency filter containing fractional-order element had been also described.

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Sadda, AlajaKumari, and Niraja Madavaneri. "A Study of Output Impedance Effects in Current-Steering Digital-to-Analog Converters." Thesis, Linköpings universitet, Elektroniksystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-87399.

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In this thesis, we have explained the different types of DAC (Digital-to-Analog) architectures and their advantages and disadvantages. We have mainly focused on current-steering digital-to-analog design for achieving high speed and high performance. The current-steering DAC is designed using binary weighted architecture. The benefits of this architecture is that it occupies less area, consumes less power and the number of control signals required are very less. The requirements for high speed and high performance DAC are discussed in detail. The circuit is implemented in a state-of-the-art 65

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16

Narayanasamy, Balaji. "Impedance Mismatching Based Design of Passive and Active EMI Filters for Power Converters." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461252861.

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17

Wong, Yan Chiew. "Impedance matching and DC-DC converter designs for tunable radio frequency based mobile telecommunication systems." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9656.

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Tunability and adaptability for radio frequency (RF) front-ends are highly desirable because they not only enhance functionality and performance but also reduce the circuit size and cost. This thesis presents a number of novel design strategies in DC-DC converters, impedance networks and adaptive algorithms for tunable and adaptable RF based mobile telecommunication systems. Specifically, the studies are divided into three major directions: (a) high voltage switch controller based DC-DC converters for RF switch actuation; (b) impedance network designs for impedance transformation of RF switche

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18

Florez, Lizarraga Martin 1963. "Impact of source impedance on input filter design criteria for a multiple converter power system." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/558170.

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19

Jayaram, Magathi. "Architecture, Modeling, and Analysis of a Plasma Impedance Probe." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/813.

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Variations in ionospheric plasma density can cause large amplitude and phase changes in the radio waves passing through this region. Ionospheric weather can have detrimental effects on several communication systems, including radars, navigation systems such as the Global Positioning Sytem (GPS), and high-frequency communications. As a result, creating models of the ionospheric density is of paramount interest to scientists working in the field of satellite communication. Numerous empirical and theoretical models have been developed to study the upper atmosphere climatology and weather. Multipl

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20

Moore, Sean. "Online condition monitoring of lithium ion batteries by performing impedance spectroscopy using a DC-DC converter." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29186.

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Li-Ion batteries are currently being used extensively in a variety of applications such as portable electronics, electric vehicles and grid storage applications, due to the high demand for high power and high energy density storage batteries. However, the usage of Li-Ion batteries requires extensive condition monitoring to increase overall performance and life expectancy. This research is focused on implementing rapid online condition monitoring techniques, using signal injection via the associated power converter in the battery management system. The technique implemented in this work is know

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21

Xu, Ling. "Modeling, Analysis and Control of Voltage-Source Converter in Microgrids and HVDC." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4967.

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The objective of this dissertation is to carry out dynamic modeling, analysis and control for Voltage-Source Converters (VSC). Two major applications of VSC will be investigated in this dissertation: microgrid application and High Voltage Direct Current (HVDC) application. In microgrid applications, VSC is used to integrate distributed energy sources such as battery and provide system functions: such as real and reactive power regulation, voltage and frequency support during islanding condition, and abnormal system condition mitigation. In HVDC applications, VSC is used to interconnect dc syst

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22

Roth, George J. "Stability Analysis of a Constant Power Load Serviced by a Buck Converter as the Source Impedance Varies." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17451.

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Approved for public release; distribution is unlimited<br>As the NAVY moves forward with plans to become less dependent on fossil fuels and more dependent on hybrid electric drives and all-electric ships, being aware of the stability issues associated with direct current (DC)-DC and DC-alternating current (AC) power converters and understanding how to solve the issues that come with using them, are very important. The negative input impedance that is observed when using a buck converter servicing a constant power load (CPL) is one of the issues that needs to be understood. Understanding the st

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23

Shah, Shahil. "Small and Large Signal Impedance Modeling for Stability Analysis of Grid-connected Voltage Source Converters." Thesis, Rensselaer Polytechnic Institute, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10786614.

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<p> Interactions between grid-connected converters and the networks at their terminals have resulted in stability and resonance problems in converter-based power systems, particularly in applications ranging from wind and PV farms to electric traction and HVDC transmission networks. Impedance-based modeling and analysis methods have found wide acceptance for the evaluation of these resonance problems. </p><p> This thesis presents small and large signal impedance modeling of grid-connected single and three phase voltage source converters (VSC) to enable the analysis of resonance conditions in

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24

Jemelík, Lukáš. "Návrh měřících struktur pro obvody s diferenčními signály." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218873.

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This master´s thesis deals about a measuring structures of elements working at a current mode. There were outlined structures for measuring input and output impedance. These structures were simulated for DACA element. It deals with a voltage to current and current to voltage converters. All structures and converters were simulated at computer program PSpice. Selected variant were practically verified and control measuring was realized.

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25

Jaksic, Marko Dragoljub. "Identification of small-signal dq impedances of power electronics converters via single-phase wide-bandwidth injection." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51222.

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AC and DC impedances of switching power converters are used for the stability analysis of modern power electronics systems at three-phase AC and single-phase DC interfaces. Therefore, a small-signal characterization algorithm for switching power converter, which is based on FFT, will be presented and explained. The presented extraction algorithm is general and can be used to obtain other small-signal transfer functions of arbitrary power converter switching simulation models. Furthermore, FFT algorithm is improved by using cross power spectral density functions for identification, resulting in

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Kong, Na. "Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77074.

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The batteries used to power wireless sensor nodes have become a major roadblock for the wide deployment. Harvesting energy from mechanical vibrations using piezoelectric cantilevers provides possible means to recharge the batteries or eliminate them. Raw power harvested from ambient sources should be conditioned and regulated to a desired voltage level before its application to electronic devices. The efficiency and self-powered operation of a power conditioning and management circuit is a key design issue. In this research, we investigate the characteristics of piezoelectric cantilevers and r

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27

Kathi, Lokesh. "Steady-State Analysis of PWM Z-Bridge Source DC-DC Converter." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1453223069.

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Ayachit, Agasthya. "Steady-State and Small-Signal Modeling of A-Source Converter." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1534187954423628.

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29

Lotfalizadeh, Behnood. "Modeling and Simulation of a Three-phase AC-DC Converter where the Impedances of the Feeding Lines are considered." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-32328.

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This thesis comprises modeling and simulation of an AC-DC converter (Battery charger). An AC-DC converter may cause a high frequency distortion in the electrical power network or augment the existing distortion caused by other devices connected to the network. The goal is to design a controller for suppressing this noise at a reasonable level. We hope the thesis can be considered as a step forward to solve the original problem. One needs an accurate model of the AC-DC converter, to design such a controller. This study tries to clarify the effects of theline inductance on the performance of the

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Liu, Guangyuan. "Advanced Controllers of Power Electronic Converters in DC Microgrids." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422330.

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To cope with the pressure of climate change and depletion of fossil fuels, distributed power generation based on sustainable and green resources, such as photovoltaic and wind, have been exploited over the past decades. High penetration of renewable energy sources challenges the normal operation of traditional power grids, due to their characteristics of intermittence and uncertainty. To address this issue, an effective way is to aggregate distributed generators, energy storage systems, and customer loads together, as a single entity, that is, the so-called microgrids. Every microgrid is a ful

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Jimenez, Saldana Cristhian Carim. "Large Scale Analysis of Massive Deployment of Converter-based Generation equipped with Grid- forming Strategies." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292690.

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To mitigate the carbon footprint and the need to fulfil the energy goals in terms of sustainability, it is required to deploy a large integration of green energies. Therefore, in the previous and the coming years, there will be a high research and technological interest in the high penetration of converter-based generation. With the replacement and integration of power converters into the bulk power grid, new challenges and issues must be faced to maintain the system´s stability and reliability in terms of procedures for the transmission system operators. The main objective of this thesis proj

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Danekar, Abhishek V. "Analysis and Design of High-Frequency Soft-Switching DC-DC Converter for Wireless Power Charging Applications." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1493990400812363.

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Schaufuß, Jörg. "Energieversorgung autarker Sensorsysteme im industriellen Umfeld durch kinetische Energiewandler mit Schwerpunkt auf dem elektrostatischen Wandlerprinzip." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-129344.

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In der vorliegenden Arbeit wird die Entwicklung eines kinetischen Energy Harvesters vorgestellt, der auf Grundlage des elektrostatischen Wandlerprinzips aus Vibrationen elektrische Energie generiert. Für die Umsetzung wurde eine Siliziummikrostruktur entworfen, die für Arbeitsfrequenzen unter 100 Hz ausgelegt ist. Die Zahnstruktur der verwendeten Elektroden ermöglicht Spaltabstände im Submikrometerbereich und folglich große Kapazitätsänderungen, die durch die Elektrodengeometrie zusätzlich mit einer höheren Frequenz als die mechanische Bewegung stattfinden. Vergleichsweise große Leistungsausbe

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Moretti, Rhafael de Souza. "Estudo e implementação de um conversor CC-CC-baseado no inversor z-sourge-alimentado por células a combustível." Florianópolis, SC, 2007. http://repositorio.ufsc.br/xmlui/handle/123456789/90783.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.<br>Made available in DSpace on 2012-10-23T15:14:21Z (GMT). No. of bitstreams: 1 243188.pdf: 2050467 bytes, checksum: 5efe86fc3caf35740fa402fcb4850ce9 (MD5)<br>Este trabalho visa a análise e a implementação prática de um conversor CC-CC elevador de tensão, baseado na topologia do inversor Z-Source, e o estudo de seu comportamento, ao ser alimentado por uma Célula a Combustível. Primeiramente, foram abordados os conceitos e os princípios de funcionamento das Célu

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Lin, Qing. "Small-Signal Modeling and Stability Specification of a Hybrid Propulsion System for Aircrafts." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103515.

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This work utilizes the small-signal impedance-based stability analysis method to develop stability assessment criteria for a single-aisle turboelectric aircraft with aft boundary-layer propulsion (STARC-ABL) system. The impedance-based stability analysis method outperforms other stability analysis methods because it does not require detailed information of individual components for system integration, therefore, a system integrator can just require the vendors to make the individual components meet the impedance specifications to ensure whole system stability. This thesis presents models of a

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Sadli, Idris. "Modélisation par impédance d'une pile à combustible PEM pour utilisation en électronique de puissance." Thesis, Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL091N/document.

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Cette thèse s’intéresse à la modélisation dynamique d’une pile à combustible (PàC) PEM en vue de son utilisation en électronique de puissance. Un modèle statique basé sur une expression de la tension en fonction du courant débité est tout d’abord présenté. Le modèle dynamique est élaboré ensuite. Il est montré que l’impédance électrochimique de diffusion-convection (Zd) s’apparente à une ligne de transmission de type RC. Une discrétisation en un nombre fini d’éléments a été effectuée. Afin d’obtenir un modèle simple, deux branches RC différentes sont considérées pour l’impédance Zd auxquelles

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Sadli, Idris. "Modélisation par impédance d'une pile à combustible PEM pour utilisation en électronique de puissance." Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL091N.

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Cette thèse s’intéresse à la modélisation dynamique d’une pile à combustible (PàC) PEM en vue de son utilisation en électronique de puissance. Un modèle statique basé sur une expression de la tension en fonction du courant débité est tout d’abord présenté. Le modèle dynamique est élaboré ensuite. Il est montré que l’impédance électrochimique de diffusion-convection (Zd) s’apparente à une ligne de transmission de type RC. Une discrétisation en un nombre fini d’éléments a été effectuée. Afin d’obtenir un modèle simple, deux branches RC différentes sont considérées pour l’impédance Zd auxquelles

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Straka, Petr. "Ultrazvukový drtič konkrementů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219202.

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This thesis is focused on the methodes of crushing kidney’s concrements with continual wave for the frequency 27 kHz and the intensity of ultrasound 10 W/cm2. The main aim is design of the ultrasound head with layer converter and design circuitry. First part of this work describes physical principle of ultrasound, ultrasound waves and methods by which could be remove kidney’s concretions. Practical part of this work is focused on compreshive design of ultrasound crushing system. In the introdiction is analyzed the proposal of applicator and the next step decscribing proposal excitation generat

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Wang, Hanqing. "Design and control of a 6-phase Interleaved Boost Converter based on SiC semiconductors with EIS functionality for Fuel Cell Electric Vehicle." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCA009/document.

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Cette thèse traite l’étude et le contrôle d’un hacheur élévateur à 6 phases entrelacées basé sur des semi-conducteurs en carbure de silicium (SiC) et des inductances couplées inverses pour véhicules électriques à pile à combustible (FCEV). . L'ondulation du courant dans la pile est combustible est considérablement réduite et la durée de vie de celle-ci peut être prolongée. Les semi-conducteurs en SiC, en raison de leurs faibles pertes, permettent de meilleures performances thermiques et une fréquence de commutation plus élevée. Les volumes des composants passifs (inductances et condensateurs)

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Montanari, Tommaso. "Sensore e interfacce per la misura di conducibilita con impedenza elettrica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9304/.

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Gli oceani coprono quasi il 75% della superficie della terra ed esercitano una grande influenza sulla vita di tutte le specie viventi e sull’evoluzione del clima a livello planetario. I repentini cambiamenti climatici hanno reso sempre piú importante studiarne i comportamenti. L’analisi della salinitá degli oceani é estremamente importante per gli studi sull’ambiente marino; puó essere usata per tracciare le masse d’acqua, descrivendone i flussi e svelandone la correlazione con i processi climatici, puó essere di aiuto ai biologi per studiare gli organismi marini e costituisce un parametro fo

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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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Prates, Mauro de Oliveira. "Processamento de sinais para caracterização de conversores eletrônicos e impedância da rede elétrica." Universidade Federal de Juiz de Fora (UFJF), 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/4099.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-19T17:51:31Z No. of bitstreams: 1 maurodeoliveiraprates.pdf: 2945720 bytes, checksum: b2933ab3f965ae9545fd42098fbc9164 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-04-20T12:29:12Z (GMT) No. of bitstreams: 1 maurodeoliveiraprates.pdf: 2945720 bytes, checksum: b2933ab3f965ae9545fd42098fbc9164 (MD5)<br>Made available in DSpace on 2017-04-20T12:29:12Z (GMT). No. of bitstreams: 1 maurodeoliveiraprates.pdf: 2945720 bytes, checksum: b2933ab3f965ae9545fd42098fbc9164 (MD5) Previous

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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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Miri, Lavasani Seyed Hossein. "Design and phase-noise modeling of temperature-compensated high frequency MEMS-CMOS reference oscillators." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41096.

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Frequency reference oscillator is a critical component of modern radio transceivers. Currently, most reference oscillators are based on low-frequency quartz crystals that are inherently bulky and incompatible with standard micro-fabrication processes. Moreover, their frequency limitation (<200MHz) requires large up-conversion ratio in multigigahertz frequency synthesizers, which in turn, degrades the phase-noise. Recent advances in MEMS technology have made realization of high-frequency on-chip low phase-noise MEMS oscillators possible. Although significant research has been directed toward r

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Samuelsson, Peter. "Management of technology in the process industries: Matching market and machine." Doctoral thesis, KTH, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199705.

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The process industries span multiple industrial sectors and constitute a substantial part of the entire manufacturing industry. Since companies belonging to this family of industries are often very asset intensive, their ability to respond to changes is often limited in the short term. The adaptation of the capabilities of existing processes, and conversely finding products and market segments to match the production system capabilities, are an important part of product- and market development activities in the process industry. The importance to companies in the process industry of having a w

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Port, Martin. "Čtyřelektrodový impedanční pletysmograf." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220285.

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This master’s thesis is an introduction to the measurement of changes in tissue impedance of blood flow by impedance plethysmography. Other chapters deal with the kinds of plethysmographs and their principles. The aim is to draft four-electrode impedance plethysmograph to measure changes in tissue impedance depending on blood flow. First, describe the individual blocks of the medical instrument. The practical part of the master’s thesis involves circuit design four-electrode plethysmograph. Given that a very important role in its function plays a constant current source operating at a frequenc

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Cunin, Bernard. "Etude et realisation d'un modulateur parametrique a double bande laterale fonctionnant a 10 ghz : application a la detection d'impulsions lumineuses breves." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13127.

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Les proprietes d'un modulateur parametrique sont analysees. On montre que ce dispositif, constitue par la capacite variable d'une jonction pn pompee a 10 ghz, est caracterise par un gain de conversion, une impedance d'entree capacitive et un bruit interne tres reduit et qu'en consequence un systeme de detection optique, forme par une diode pin rapide couplee au convertisseur parametrique, presente un rapport signal a bruit superieur a celui des dispositifs de detection sans amplification interne habituellement utilises, au moins tant que la bande passante video est inferieure a 4 ghz. Enfin, o

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Silva, Leonardo de Araujo. "Sintese de indutancia negativa para aplicação serie em redes de energia eletrica." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260861.

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Orientador: Jose Antenor Pomilio<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-09T17:17:10Z (GMT). No. of bitstreams: 1 Silva_LeonardodeAraujo_D.pdf: 14156071 bytes, checksum: f544bd5c73e51000deee838abcc80fa7 (MD5) Previous issue date: 2007<br>Resumo: Nesta tese é introduzida uma nova estratégia de controle que permite a síntese de indutâncias negativas para realização da compensação série de linhas de transmissão. O método, que é baseado na estratégia SDR (Síntese Direta de Reatâncias), opera

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Moreau, Maxime. "Modélisation haute fréquence des convertisseurs d'énergie : application à l'étude des émissions conduites vers le réseau." Phd thesis, Ecole Centrale de Lille, 2009. http://tel.archives-ouvertes.fr/tel-00579671.

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Ces travaux de recherche portent sur la problématique CEM (Compatibilité Electromagnétique) en électronique de puissance. Cette étude s'intéresse particulièrement à la modélisation HF (haute fréquence) des convertisseurs d'énergie dans le but d'étudier la propagation des perturbations conduites vers le réseau avec ou sans l'utilisation du RSIL (Réseau Stabilisateur d'Impédance de Ligne). Une première partie présente les outils de modélisation des sources de perturbation dans les convertisseurs statiques.La seconde partie est consacrée à la modélisation HF d'un système d'entraînement à vitesse

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Хома, Юрій Володимирович. "Теорія і методи комп’ютерного опрацювання біосигналів на основі машинного навчання". Diss., Національний університет "Львівська політехніка", 2020. https://ena.lpnu.ua/handle/ntb/56149.

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У дисертаційній роботі вирішено актуальну науково-прикладну проблему у галузі інструментального забезпечення біоінформатики – розвиток теоретичних засад і нових підходів до удосконалення комп’ютерних систем опрацювання біосигналів на основі широкого використання штучних нейромереж і технологій глибинного навчання. Представлено концепцію трьох системних рівнів комп’ютерного опрацювання біосигналів, що базується на чіткому розмежуванні функцій системних рівнів від методів і засобів, що їх реалізують. Таке розділення сприяє структуризації знань, уможливлює оцінювання ефективності різних методів

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