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Dissertations / Theses on the topic 'Active filter'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chow, Albert C. (Albert Chin-Hoa) 1977. "Active filter techniques for reducing EMI filter capacitance." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87314.

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2

Othman, Mohd Ridzal. "DSP-based active power filter." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/6966.

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Harmonics in systems are conventionally suppressed using passive tuned filters, which have practical limitations in terms of the overall cost, size and performance, and these are particularly unsatisfactory when large number of harmonics are involved Active power filtering is an alternative approach in which the filter injects suitable compensation currents to cancel the harmonic currents, usually through the use of power electronic converters. This type of filter does not exhibit the drawbacks normally associated with its passive counterpart, and a large number of harmonics can be compensated

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3

Van, Greunen Corneluis Erasmus. "Neutral-point-clamped shunt active filter." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1265.

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4

Cheng, Louis. "Efficient DSP-based active power filter." Thesis, Teesside University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410837.

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5

Wu, Yue. "Active filter design for wireless communications /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486474078051051.

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6

Towliat, Abolhassani Mehdi. "Integrated electric alternators/active filters." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/268.

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In response to energy crisis and power quality concerns, three different methodologies to integrate the concept of active filtering into the alternators are proposed. Wind energy, due to its free availability and its clean and renewable character, ranks as the most promising renewable energy resource that could play a key role in solving the worldwide energy crisis. An Integrated Doubly-fed Electric Alternator/Active filter (IDEA) for wind energy conversion systems is proposed. The proposed IDEA is capable of simultaneous capturing maximum power of wind energy and improving power quality, whic

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7

Abolhassani, Mehdi Towliat. "Integrated electric alternators/active filters." Texas A&M University, 2004. http://hdl.handle.net/1969.1/268.

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In response to energy crisis and power quality concerns, three different methodologies to integrate the concept of active filtering into the alternators are proposed. Wind energy, due to its free availability and its clean and renewable character, ranks as the most promising renewable energy resource that could play a key role in solving the worldwide energy crisis. An Integrated Doubly-fed Electric Alternator/Active filter (IDEA) for wind energy conversion systems is proposed. The proposed IDEA is capable of simultaneous capturing maximum power of wind energy and improving power quality, whic

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8

Tu, Yifeng. "Multiple Reference Active Noise Control." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36790.

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The major application of active noise control (ANC) has been focused on using a single reference signal; the work on multiple reference ANC is very scarce. Here, the behavior of multiple reference ANC is analyzed in both the frequency and time domain, and the coherence functions are provided to evaluate the effectiveness of multiple reference ANC. When there are multiple noise sources, multiple reference sensors are needed to generate complete reference signals. A simplified method combines those signals from multiple reference sensors into a single reference signal. Although this method cou

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9

Shadrin, Aleksandr. "Analogové pole pro realizaci programovatelného filtru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221026.

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The state-variable analog filter topologies are described. Using the transfer function theory and operational configurations suitable for integration and derivation, a new universal filter topology are proposed. The circuit has been implemented in CMOS technology by using six operational amplifiers, eight analog switches and five programming resistor array. Tunable corner frequencies, quality factors and gain are realized. Using the serial peripheral interface or digital memory can be realized this real-time digitally programmable first- and second-order analog filter with the tunable paramete

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10

Ozkaya, Hasan. "Parallel Active Filter Design, Control, And Implementation." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608438/index.pdf.

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The parallel active filter (PAF) is the modern solution for harmonic current mitigation and reactive power compensation of nonlinear loads. This thesis is dedicated to detailed analysis, design, control, and implementation of a PAF for a 3- phase 3-wire rectifier load. Specifically, the current regulator and switching ripple filter (SRF) are thoroughly investigated. A novel discrete time hysteresis current regulator with multi-rate current sampling and flexible PWM output, DHCR3, is proposed. DHCR3 exhibits a high bandwidth while limiting the maximum switching frequency for thermal stability a

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11

Perry, David John. "Active CR filter structures using multiple feedback." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38135.

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12

Carpenter, Paul Andrew. "Active filter current compensation for transmission optimisation." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24291.

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This dissertation is based on the fact that any m-wire electrical system can be modelled as m-equivalent Thevenin voltages and impedances when viewed from any node. The dissertation describes how to calculate the optimal distribution of currents, so a specific amount of power can flow through and reach the network equivalent Thevenin voltages with minimal losses. The optimal current distribution method uses a recently patented method which calculates the optimal currents for each of the wires which are shown to be obtained from the Thevenin parameters and power flow at any instant in time at a

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13

Sedighy, Mohammad. "A robust VSC-based shunt active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ41307.pdf.

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14

Muthu, Subramanian. "Analysis and control of unified active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37357.pdf.

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15

Schmit, Andrew Paul. "Hybrid Active Power Filter with Output Impedance Control." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/79684.

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In an ideal world, unwanted or undesirable effects in a system could and would be completely ignored. In fact, this was the case in mid-80s' PC design when an 80286 microprocessor running at a "blazing" 12 MHz was considered leading-edge technology. As technology continued to push the envelope and ever-faster designs were realized, more demanding software packages were developed and utilized efficiently. These increasingly sophisticated software packages in turn allowed designers of all disciplines to test systems of escalating complexity. These more complex models placed a heavier burden on t

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16

Malmqvist, Robert. "Tuneable recursive active monolithic microwave integrated circuit filters /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek698s.pdf.

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17

Hansmann, Chirstine Henriette. "Active capacitor voltage stabilisation in a medium-voltage flying-capacitor multilevel active filter." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1762.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.<br>A switching state substitution must be developed that will make use of both single-phase redundancies and three-phase redundancies in the flying-capacitor topology. Losses should be taken into consideration and the algorithm must be designed for implementation on the existing PEC33 system, with on-board DSP (TMS320VC33) and FPGA (EP1K50QC208). The specific power-electronics application is a medium-voltage active filter. Existing capacitor voltage stabilisation schemes are investigated and a capac

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18

Arman, Mahmoud Fayez. "An 'active' passive-filter topology for low power DC/AC inverters." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6072.

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This thesis presents a new output passive filter for voltage source inverter applications which is based on a shunt connected single tuned filter topology. The proposed circuit has the advantage of tracing harmonic components wherever its location in the frequency spectrum. The change in the harmonic location might be as a result of a change in the inverter operating frequency. Also, the proposed filter achieves harmonic reduction close to the traditional single tuned passive filter. In order to show the superiority of the proposed model, a comparison is introduced with other self tuning harmo

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19

Borg, Johan. "Studies on Tuning of Integrated Wave Active Filters." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1786.

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<p>The first part of this thesis contains a literature study of current tuning techniques for continuous-time integrated filters. These tuning methods are characterised by which quantity they measure, their dependence on certain characteristics of the input signal, or matching of components on chip. The structure of the different tuning schemes are explained. The merits and drawbacks as well as achieved accuracies of previous works are summarised. </p><p>The second part is a study of wave active filters (WAFs), a less common structure for implementing active filters. In this structure the filt

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20

Loke, Clare Siew Ling. "Control, design, and analysis of the series active filter." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408837.

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21

Goldman, Matthew 1965. "A low sensitivity dual feedback active RC bandpass filter." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277139.

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This thesis presents the analysis and characterization of a low sensitivity dual feedback active RC bandpass filter. Chapter 2 details the analysis of the network and a method of simplifying the resultant transfer function by a single pole/zero cancellation. Chapter 3 characterizes the simplified transfer function through an analysis of the quality factor and of the center frequency gain as functions of the individual variables of the circuit. It also details sensitivity analyses of these characteristic quantities and a stability analysis. Lastly, chapter 3 presents graphical representations o

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22

Booth, Brian. "An Active Power Supply Filter with Ultra Wide Bandwidth." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28281.

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An active transformerless common mode ?lter is designed for use with switching mode power supplies with a switching frequency greater than 1MHz. The ?lter utilizes an ampli?er in a voltage sensing current adjusting architecture to cancel out common mode noise generated by the switching power supply. The ?lter is analyzed using a transfer function, simulation, and measurements. Several possible feedback con?gurations are examined and bene?ts of di?erent con?gurations are explained. The active ?lter is shown to have superior performance to only passive components at frequencies up to 20MHz. Spec

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23

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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24

Alvarez-Tinoco, Antonio Mario. "Adaptive algorithms for the active attenuation of acoustic noise." Thesis, Heriot-Watt University, 1985. http://hdl.handle.net/10399/1607.

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25

Kim, Sang-Myeong. "Active control of sound in structural-acoustic coupled systems." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245303.

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26

Skorcz, Alex Joseph. "Performance evaluation of an active filter non-regenerative AC drive." Thesis, Texas A&M University, 2007. http://hdl.handle.net/1969.1/85833.

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The purpose of this work is to evaluate the performance of a specific ac drive topology that is of current interest in industry. With the increasing pressure for compliance with IEEE-519 and other international harmonic standards, many ac drive manufacturing companies are seeking innovative and cost effective solutions for controlling the amount of harmonics produced at the point of common coupling (PCC). The proposed topology is a potential alternative to the three-phase diode bridge which is the conventional rectifier topology for non-regenerative applications. The work of this thesis explai

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27

Le, Clement de Saint-Marcq Vianney. "Castor : a constraint-based SPARQL engine with active filter processing." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10275/document.

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SPARQL est le langage de requête standard pour les graphes de données du Web Sémantique. L’évaluation de requêtes est étroitement liée aux problèmes d’appariement de graphes. Il a été démontré que l’évaluation est NP-difficile. Les moteurs SPARQLde l’état-de-l’art résolvent les requêtes SPARQL en utilisant des techniques de bases de données traditionnelles. Cette approche est efficace pour les requêtes simples qui fournissent un point de départ précis dans le graphe. Par contre, les requêtes couvrant tout le graphe et impliquant des conditions de filtrage complexes ne passent pas bien à l’éche

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28

Petrili, Daniele. "Active filter circuit and control methods to reduce energy storage." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187679.

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The high market demand for power electronics converters nowadays requires converters with high power quality, great reliability and low cost. However, there are several challenges related to these systems, one relevant example is the energy ripple in the DC bus for single phase converters which causes problems such as overheating and reduction of the capacitor lifetime. To limit this energy ripple, which consists of the second order harmonic in the DC bus, a bulky DC link capacitor is usually required. Although, it results in low power density and large converter volume. Some of these capacito

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29

Mkhize, Michael. "Design and implementation of a single phase active power filter." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11061.

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Various active filter solutions have been proposed in recent years {I], {2], and are still being widely investigated today. This thesis discusses the design and implementation of the shunt AP F topology.

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30

Deville, Yannick. "Filtres actifs RC hyperfréquences intégrés sur arséniure de gallium." Grenoble 1, 1989. http://www.theses.fr/1989GRE10015.

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Les filtres etudies sont en grande partie des filtres d'ordre 2: filtres passe-bande a forte selectivite, filtre coupe-bande, filtres passe-tout. Ces filtres passe-tout ont ete utilises pour realiser des dephaseurs 90**(o) large bande

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31

Li, Ruomei. "Modelling of active filters for improving power quality." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323585.

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32

Tingleff, Jens. "Current Mode Wave Active Filters : a topology for high frequency integrated filters." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337669.

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33

Al-Hashimi, B. M. A. "On the analysis and synthesis of active filters using transconductance amplifiers." Thesis, University of York, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234974.

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34

Sharma, Attma. "Switched-active and passive, hybrid filter for resonance-free transient regulation." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015604.

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35

Mossoba, Joseph T. "Unit-delay deadbeat control of a high bandwidth active power filter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63023.pdf.

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36

Carastro, Fabio. "Power quality enhancement using a shunt active filter with energy storage." Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493118.

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Electrical systems are subject to a wide variety of power quality problems which can interrupt production processes, affect sensitive equipment, and cause downtime. Several power quality studies show that harmonics and voltage sags have been identified as the most serious problems facing industrial customers today, especially in small independent grids which employ distributed generation units.

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37

Zhou, Zheng. "Simulation and control of active filter." 2004. http://hdl.handle.net/1993/17910.

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38

Ming-Ta, Yang, and 楊明達. "Implementation of Digital Active Power Filter." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/27309731383038396886.

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碩士<br>國立雲林科技大學<br>電機工程技術研究所<br>86<br>Power electronics have been widely used in ac to dc converters. They own performances of fast response, small volume, and high efficiency, but serious power pollution is also introduced. Traditional solutions are using capacitor and inductor to make up passive filter for solving harmonics problem. To improve system power factor, a reactive power compensator is used to increase the power efficiency and reduce the transmission line loss. Active power filter not only has the properties of reactive power compensator but also simultaneously eliminate harmonic cu

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39

Lo, Ming-Cheng, and 羅明誠. "Study of Tunable Active RF Filter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/19938489418153572335.

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碩士<br>國立臺北科技大學<br>機電整合研究所<br>91<br>The main objective of this thesis is to design a tunable active bandpass filter. The circuit design and analysis employed fundamental theory of the capacitor-coupling narrow bandpass filter and low noise amplifier. The center frequency of the filter can be tuned form 1.8GHz to 2.4GHz by way of the choice of fundamental bias circuit, RF choke design, circuit design of input and output passive networks with consideration of impedance matching, and tuned capacitor. On the other hand, tuning capacitors of the passive networks can make an amplifier that shift in t

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40

Huang, Chih-Hua, and 黃志華. "Active Filter in Applications to Headsets." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/27804858445315257265.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>93<br>This thesis is concerned with the analysis and design of a feedforward active noise reducing headset. By means of active noise control (ANC) theory, the noise reducing headset can be implemented. Active noise reducing headsets are used to protect professionals in noisy environments, such as aircraft cabins, machine rooms, heavy vehicles and army vehicles. Design of the noise reducing headset includes two dynamic microphones, one amplifier, one trumpet, and the TMS320C6711 DSK. Because considering that the ageing and propagation delay of electronic elements,

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41

Wang, Hsing-Liang, and 王興良. "A Novel Digital Active Power Filter." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/53443875569100134945.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>87<br>Recently, the equipment of power electronics have been widely used in industry. These nonlinear loads often produce a lot of harmonics and affect the quality of the power system. In order to reduce the harmonics, passive L-C filters have been widely used in recent years. Since many drawbacks have been observed in passive compensation methods, active power filters will be examined in this work. It is well known that active power filters can not only reduce the harmonic components, but also improve the power factor. It is rather common to have the active filters

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42

Mishra, G. "Design of Passive High Pass Filter for Hybrid Active Power Filter Applications." Thesis, 2013. http://ethesis.nitrkl.ac.in/4827/1/211EE2134.pdf.

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In recent years there has been considerable concern over power quality, at both distribution and consumer levels, and the need to control reactive power and voltage stability at transmission levels. Active filtering of electric power has now become a mature technology for harmonic and reactive power compensation in two-wire (single phase), three-wire (three phase without neutral), and four-wire (three phase with neutral) ac power networks with nonlinear loads. Active power filter and passive filters (APF & PF) are the traditional ways of compensating for harmonics. However, both of the two way

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43

Chien, Yuan-Bor, and 簡源伯. "Study of Three Phase Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09929416146281120884.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>89<br>As various of solid-state converters are found in a wide variety of end-use applications, voltage distortion and current harmonics produced by power electronics equipment has become a serious problem to be solved in many countries. Recently, active power filter appears to be an attractive method and is employed to replace the conventional passive LC filter for improving power quality. They are classified into shunt APF, series APF, combination of shunt and series APF, and hybrid APF. In this thesis, the basic compensation principles and control algorithms of

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44

Chan, ZhaoMing, and 陳昭銘. "One Phase Multi-level Active Power Filter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/44100454809458020705.

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碩士<br>聖約翰科技大學<br>電機工程系碩士班<br>100<br>In recent years, nonlinear loads have such as switch-mode power supplies and motor drives have been applied in life widely. These nonlinear that result inharmonic currents and harmonic voltages have become serious problems for both utilities and customers. A shut active power filter based on power electronic technology has been proposed to eliminate harmonics and improve power factor simultaneously. In natural-point-clamp(NPC) structure based on the three-level-pulse width modulation scheme are studied. To compare with two-level-inverter, three-level-invert

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Chen, Ying-Shen, and 陳映先. "Adaptive IIR Filter for Active Noise Control." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/94603722740050144759.

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碩士<br>國立中興大學<br>機械工程學系所<br>94<br>The aim of this thesis is to examine applications of adaptive IIR filters with a FuLMS algorithm for active noise control (ANC). Due to existence of a secondary path in ANC systems, a small value of step size is applied to FuLMS algorithm and generally leads to slow convergence. To improve this difficulty, two approaches have been taken into account. One approach applies a modified residual error for the FuLMS algorithm. Another approach applies a robustly controlled secondary path for the adaptive IIR filter. Results of computer simulation show that adaptive I

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46

Fan, Kang-Wei, and 范綱維. "Designs of MMIC Active Band-Pass Filter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/59768263746582198402.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>91<br>Filters in microwave frequency play an important role in wide application in communication, radar and signal processing systems. Traditionally, such filters have been implemented as passive networks of waveguide, transmission line, or discrete limped elements. However, due to the improvement in monolithic microwave integrated circuit (MMIC) process technology, more and more systems utilize the active filter instead of the passive filter. Compared to the passive filter, the active filter is advantageous in small size, compatibility with other ICs and low los

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47

Acharya, Beena Sivyakova. "Realization of high power active filter networks." 1989. http://catalog.hathitrust.org/api/volumes/oclc/20476082.html.

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Thesis (M.S)--University of Wisconsin--Madison, 1989.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 127-128).

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48

SHREYANSH. "ACTIVE FILTER IMPLEMENTATION USING CURRENT MODE BLOCK." Thesis, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18939.

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One of the famous and fundamental building block that may be utilised in a variety of ways to perform various analog processing function is a Current Conveyor abbreviated as CC. Till date various researches has been made in this regards and various functionality like amplifier, filters etc can be achieved by using these devices. A Current Conveyor is a minimum three terminal devices but not limited to it. CC’s can be classified according to their generation. The current conveyor (CC) concept was first released in 1968 this is called as first generation of current conveyor and after

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49

Yang, Ssu-Che, and 楊思哲. "Design of Voltage-Mode Tunable Active Filter Based on Current-Mode Active." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/mbr3n2.

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碩士<br>國立臺北科技大學<br>電腦與通訊研究所<br>96<br>The key point of major research of this thesis is that the author uses the linear transformation method to design the low-pass tunable bandwidth active filter. This thesis can be divided into three parts. The first part of this thesis is to implement a 6th-order Butterworth low-pass filter using second generation current conveyors with TSMC 0.35μm 2P4M technology. The power supply is ±1.65V, the power consumption is 30.7mW, and the chip area is 0.168588mm2. The second part of this thesis is to implement a 6th-order tunable Butterworth low-pass filter using d

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50

Muthu, Subramanian. "Analysis and control of unified active power filter." Thesis, 1998. https://dspace.library.uvic.ca//handle/1828/8790.

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The combined series and shunt active filters have been proposed to alleviate the power quality problems at the demand-side power systems. They provide compensation for load reactive power, load harmonics, unbalanced loads, utility harmonics, utility disturbances and utility imbalance. However, the conventional approach for the control of the combined active filter systems have resulted in large operating capacity of the shunt active filter because reactive power compensation involves only the shunt active filter. Furthermore, the harmonic mitigation problems are handled mainly by indirec

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