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Design and analysis of electronically reconfigurable filtering structures
Kříčka, Tomáš ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This bachelor thesis deals with the proposal of analog filters with the ability of the electronic reconfiguration. The main aim was to propose three fully electronically reconfigurable filters using different methods. The work focuses on the use of modern active elements that ensure the electronic reconfiguration. Specifically on operational transconductivity amplifiers, second-generation current conveyors and current amplifiers. The transfer functions are simulated in the Orcad PSpice software, at the ideal and behavioral level. Sensitivity and parasitic analysis is applied to the two proposed filtration structures. Both structures are made on printed circuit boards, which are measured and then their transfer functions are compared with the simulated functions.
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Selected Types of DC Circuit Analysis in MATLAB Programming Language
Urbanová, Hedvika ; Haupt, Jaromír (referee) ; Ellederová, Eva (advisor)
Tato bakalářská práce se zabývá metodami analýz elektrických obvodů a to jak metodami univerzálními, tak speciálními. Metody byly v práci teoreticky definovány. Následně byl vysvětlen postup při počítání a zhodnoceny jejich výhody a nevýhody. Univerzální metody byly vysvětleny na příkladu, který byl pro všechny metody identický. MATLAB byl představen jako programovací jazyk. Čtyři z metod byly přepsány do programovacího jazyka MATLAB 2014a. Naprogramovány byly metody smyčkových proudů, uzlových napětí, Kirchhoffovy zákony a metoda superpozice. Metoda smyčkových proudů byla stejně jako Kirchhoffovy zákony naprogramována pro dvě až čtyři smyčky. Metoda uzlových napětí byla pak naprogramována pro dva až čtyři uzly. Metoda superpozice byla naprogramována pouze pro dvě smyčky. Grafické uživatelské rozhraní bylo definováno a vytvořeno pro program Kirchhoffových zákonů. V závěru projektu bylo zváženo využití programů studenty.
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Synthesis of frequency filters with ability of the electronic reconfiguration
Theumer, Radek ; Šotner, Roman (referee) ; Langhammer, Lukáš (advisor)
This bachelor thesis deals with proposal of frequency filters providing electronic controllability of its transfer function. The main aim was to propose new filtering structures working in voltage and current mode based on suitable proposal methods. Active elements are implemented by available operational transconductance amplifiers, current amplifiers and conveyors, eventually voltage amplifiers. Four different active controllable filters are presented. Their function is simulated in software PSpice with help of models at transistor level in comparison with ideal behavior (idealized models). Two designed filtering structures were chosen and complemented on parasitic, sensitivity, stability, temperature analysis and Monte Carlo analysis. These circuits were realized on PCB. Measurement results are presented at the end of thesis, including comparison with simulations.
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Development of the tool for application of the method for localization of unsymmetrical faults
Pospíšil, Tomáš ; Vyčítal, Václav (referee) ; Topolánek, David (advisor)
In resonant earthed distribution systems, the capacitive current of the system is compensated by grounding via a arc suppression coil. The level of fault current is then very small and independent on the fault location which greatly complicates the rapid finding of the fault site. At this moment there is no method to be used to directly locate the site of a single-phase fault in the distribution network, new methods and solutions are being constantly sought to address the shortcomings of the existent localization methods. The diploma thesis deals with the design of a universal software tool that allows to apply a new method of locating an asymmetric fault in the distribution network. The tool is created in a MATLAB environment and utilizes the negative sequence voltage measured on the low-voltage sides of the distribution transformers and the negative sequence current measured behind the power transformer. By using the proposed tool, it is possible to read the parameters of any part of the distribution system that the user enters together with the measured values of the voltage and current into the initialization file. After the specified network parameters are loaded, a numerical model is created, which is then used for the method. In the work is described in detail the way of entering the parameters of the network into the initialization file, the method of automatic assembling of the numerical model based on the entered data and the possibility of customizing the calculation parameters. At the end of the thesis, the functionality of the proposed software tool is verified on data from simulation of the test network.
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Design and analysis of electronically reconfigurable filtering structures
Kříčka, Tomáš ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This bachelor thesis deals with the proposal of analog filters with the ability of the electronic reconfiguration. The main aim was to propose three fully electronically reconfigurable filters using different methods. The work focuses on the use of modern active elements that ensure the electronic reconfiguration. Specifically on operational transconductivity amplifiers, second-generation current conveyors and current amplifiers. The transfer functions are simulated in the Orcad PSpice software, at the ideal and behavioral level. Sensitivity and parasitic analysis is applied to the two proposed filtration structures. Both structures are made on printed circuit boards, which are measured and then their transfer functions are compared with the simulated functions.
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|
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Synthesis of frequency filters with ability of the electronic reconfiguration
Theumer, Radek ; Šotner, Roman (referee) ; Langhammer, Lukáš (advisor)
This bachelor thesis deals with proposal of frequency filters providing electronic controllability of its transfer function. The main aim was to propose new filtering structures working in voltage and current mode based on suitable proposal methods. Active elements are implemented by available operational transconductance amplifiers, current amplifiers and conveyors, eventually voltage amplifiers. Four different active controllable filters are presented. Their function is simulated in software PSpice with help of models at transistor level in comparison with ideal behavior (idealized models). Two designed filtering structures were chosen and complemented on parasitic, sensitivity, stability, temperature analysis and Monte Carlo analysis. These circuits were realized on PCB. Measurement results are presented at the end of thesis, including comparison with simulations.
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Development of the tool for application of the method for localization of unsymmetrical faults
Pospíšil, Tomáš ; Vyčítal, Václav (referee) ; Topolánek, David (advisor)
In resonant earthed distribution systems, the capacitive current of the system is compensated by grounding via a arc suppression coil. The level of fault current is then very small and independent on the fault location which greatly complicates the rapid finding of the fault site. At this moment there is no method to be used to directly locate the site of a single-phase fault in the distribution network, new methods and solutions are being constantly sought to address the shortcomings of the existent localization methods. The diploma thesis deals with the design of a universal software tool that allows to apply a new method of locating an asymmetric fault in the distribution network. The tool is created in a MATLAB environment and utilizes the negative sequence voltage measured on the low-voltage sides of the distribution transformers and the negative sequence current measured behind the power transformer. By using the proposed tool, it is possible to read the parameters of any part of the distribution system that the user enters together with the measured values of the voltage and current into the initialization file. After the specified network parameters are loaded, a numerical model is created, which is then used for the method. In the work is described in detail the way of entering the parameters of the network into the initialization file, the method of automatic assembling of the numerical model based on the entered data and the possibility of customizing the calculation parameters. At the end of the thesis, the functionality of the proposed software tool is verified on data from simulation of the test network.
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Selected Types of DC Circuit Analysis in MATLAB Programming Language
Urbanová, Hedvika ; Haupt, Jaromír (referee) ; Ellederová, Eva (advisor)
Tato bakalářská práce se zabývá metodami analýz elektrických obvodů a to jak metodami univerzálními, tak speciálními. Metody byly v práci teoreticky definovány. Následně byl vysvětlen postup při počítání a zhodnoceny jejich výhody a nevýhody. Univerzální metody byly vysvětleny na příkladu, který byl pro všechny metody identický. MATLAB byl představen jako programovací jazyk. Čtyři z metod byly přepsány do programovacího jazyka MATLAB 2014a. Naprogramovány byly metody smyčkových proudů, uzlových napětí, Kirchhoffovy zákony a metoda superpozice. Metoda smyčkových proudů byla stejně jako Kirchhoffovy zákony naprogramována pro dvě až čtyři smyčky. Metoda uzlových napětí byla pak naprogramována pro dva až čtyři uzly. Metoda superpozice byla naprogramována pouze pro dvě smyčky. Grafické uživatelské rozhraní bylo definováno a vytvořeno pro program Kirchhoffových zákonů. V závěru projektu bylo zváženo využití programů studenty.
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Direct Current Electronic Circuits Editor
Elis, Martin ; Kopřiva, Jan (referee) ; Kunovský, Jiří (advisor)
The main task of this work was to develop a simple intuitive editor of electrical circuits able of analysis its designed schemes. Application should be designed as a supporting studying material for students of circuit theory course for better understanding of learned techniques for solving electrical circuits. That's why implemented analysis should stand with procedures of solving electrical circuits, which are taught in this course, concretely mesh-current analysis and node-voltage analysis. Another important task was development of transparent structure for electrical schemes storing in xml format. The last objective was to compare efficiency of this application and similar programs for solving electrical circuits.
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