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Brightness control of light sources
Dostál, Lukáš ; Vorel, Pavel (referee) ; Huták, Petr (advisor)
Thesis is focus on brightness control of lighting sources. The first objective of the thesis is to determine basic concepts and explain interrealationships among particular magnitudes of lifting technology. Further is necessary describe functionality, particular light sources and thein possibility of use in practise. There is also outline issue of darkfall of particular types of sources and their evolution. The other part of thesis compare energy output of lighting sources and describe their possible future development. Further this thesis deals with options of regulating of brightness for LED moduls. There is also proposal of acceptable amperage regulator LED moduls including its software - microcontrol ATMEL AVG. Microcontrol ATMEL AVG Tiny 13 is programme in C language within computer environment AVR Studio 4 and will be record through the use of AVR Dragon.
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Analog nonlinear function structures for educational laboratory purposes
Filko, Patrik ; Dvořák, Radek (referee) ; Šotner, Roman (advisor)
This master’s thesis deals with the design and the realization of a laboratory teaching device, which includes two-port parts with nonlinear transmission characteristics corresponding to quadratic, inverse quadratic and cubic functions. It also includes a more complicated design of a polynomial function converter that offers students a practical view of functions mathematically designed while verifying their accuracy in laboratory exercises. The whole concept is supported by the design of the power supply circuit and the harmonic signal generator. The individual features of this project are feasible from components commercially available.
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Digitally controlled filter
Rez, Jan ; Szabó, Zoltán (referee) ; Friedl, Martin (advisor)
This bachelor's thesis deals with design of a functional prototype universal digitally controlled analog frequency filter 2th order. Part of the design is the selection of appropriate filter topology diagram and selection of an integrated circuit. Universal filter will contain lowpass, highpass, bandpass and notch filter. The filter is tuned in cutoff frequency from 100 Hz to 15 kHz. The bachelor's thesis focuses on the circuit analysis of selected concrete structure of universal filter and possibilities of digital control filters. The practical part of this thesis includes PCB design, control software for filter and graphical representation of measured results.
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Inverter for arc welding
Matiaško, Maroš ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This bachelor’s thesis describes designing, paremeter rating and construction of welding source on the principle of high-frequency inverter. The main scope of work is to design a switching inverter for arc welding on the principle of the forward converter. Welding source is regulated for demand of constant current.
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Optimization of the switching power supplies with synchronous rectifier
Skácel, Josef ; Macháň, Ladislav (referee) ; Žák, Jaromír (advisor)
This thesis deals with switching circuit topic, especially switching power supplies. There are switching circuits without inductance and their benefits presented in the thesis. Basic topologies of switching power supplies, their properties, application area and functions of basic types of converters are also described. The next section focuses on special resonant switching power supplies and synchronous. The main part of the work is carried out simulations using three synchronous rectifiers. The work includes practical design of an SMPS with synchronous rectifier.
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New solutions of converters for measurement of current-mode filters
Štork, Petr ; Kubánek, David (referee) ; Jeřábek, Jan (advisor)
This bachelor’s thesis describes some new solutions of differential converters that convert voltage to current and vice versa. Such converters are necessary for measurement of frequency filters in a current mode due to absence of instruments able to mesure signals with current as signal carrier. The goal is to design such converters that should influence gauged frequency properties in a current mode as little as possible. Converters will consist of operative amplifiers with current feedback. Converters designed this way are tested using simulations from PSpice programme, where particularly wideness of band of individual solutions is tested. Simulated solutions that are the most suitable ones are practicably re-enacted and gauged. These resuls of measurement and simulations are compared.
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HW and SW for Ethernet-to-IEEE802.15.4 bridge
Růžička, Tomáš ; Štohl, Radek (referee) ; Fiedler, Petr (advisor)
In this work we deal with the converter, to serve as a bridge between the two protocols. These protocols are Ethernet and wireless IEEE 802.15.4 protocol. Wireless part of this work, however, I simulated via serial RS 232nd After Ehternetu can send data via TCP or UPD protocol. First is the need for a converter to connect to the network and then create a packet. Finally, it is necessary to also address the views received and sent data via Ethernet and the RS-232.
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Step-Up converter for mobile device
Gabriel, Petr ; Červinka, Dalibor (referee) ; Huták, Petr (advisor)
The purpose of this bachelor‘s thesis is about to intoduce possibilities of construction and use of switched power supplies. Thesis focuses mainly to description of different types of converters. There are possibilities of power supplie's design and sizing of its components described in this thesis. This thesis contains concrete design of power supply for realization. There are results of the measurement and comparision to the parameters given by manufacturer set forth at the end of this thesis.
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Design and realization of V/I and I/V symmetrical converters
Chrást, Jakub ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
Master´s thesis deals about design of symmetrical converters voltage on current and current on voltage. These converters will be used for measuring frequency characteristics of differential frequency filters. Current feedback amplifier was used as active element. Some circuits useful for this function were chosen. Various integrated circuits were put into these circuits. All variations were simulated in computer program Orcad. In terms of computer simulations the best variation was chosen. Selected variants were practically verified and control measuring were realized.
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Four-electrode impedance plethysmograph
Port, Martin ; Kolář, Radim (referee) ; Chmelař, Milan (advisor)
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 frequency of 60kHz, this subset was implemented and verified its correct function. To draw component schemes used program EAGLE version 5.10.0.
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