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Methods for testing of analog circuits
Kincl, Zdeněk ; Vlček, Čestmír (referee) ; Husák, Miroslav (referee) ; Kolka, Zdeněk (advisor)
Práce se zabývá metodami pro testování lineárních analogových obvodů v kmitočtové oblasti. Cílem je navrhnout efektivní metody pro automatické generování testovacího plánu. Snížením počtu měření a výpočetní náročnosti lze výrazně snížit náklady za testování. Práce se zabývá multifrekveční parametrickou poruchovou analýzou, která byla plně implementována do programu Matlab. Vhodnou volbou testovacích kmitočtů lze potlačit chyby měření a chyby způsobené výrobními tolerancemi obvodových prvků. Navržené metody pro optimální volbu kmitočtů byly statisticky ověřeny metodou MonteCarlo. Pro zvýšení přesnosti a snížení výpočetní náročnosti poruchové analýzy byly vyvinuty postupy založené na metodě nejmenších čtverců a přibližné symbolické analýze.
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Smart digital door lock system using IoT networks
Vitula, Marek ; Kincl, Zdeněk (referee) ; Záplata, Filip (advisor)
This master thesis describes the design of a battery-powered smart lock using IoT networks and NFC technology for user authentication. The first part of the thesis describes the individual components to be used for the device design and also deals with the design of matching circuits and the antenna for the NFC. The following part of the thesis describes the design of the hardware, particularly the design of the printed circuit board. The third part describes the firmware and the final part of the thesis is dedicated to the security analysis.
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Controler for brushless motors
Zdařil, Tomáš ; Bradáč, Zdeněk (referee) ; Kincl, Zdeněk (advisor)
The goal of the thesis was to design and create one-way speed controler for brushless DC motors, that is used in air modeling. The function is based on the without sensors control method and circuit is controlled by the Atmel AVR. Power unit for motor is used Li – pol accumulator. The controller is equipped with a BEC to power the receiver and allows monitoring current and voltage on the accumulator. The measured data can be uploaded to a PC.
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Communication protocols for Free-Space Optical links
Šedo, Ondrej ; Kincl, Zdeněk (referee) ; Kolka, Zdeněk (advisor)
This master’s thesis is focused on behaviour of the TCP/IP protocol on free-space optical link which is affected by the effect of atmospheric turbulence. This causes fluctuation of the received optical power and therefor bit error rate changes. In the simulation model short-time bit error rate is calculated from random generated received optical signal and then used in time-domain analysis of the OMNeT++ network simulator. A buffer in transmitter is designed based on simulation results. It pauses the data transmitting in cases of FSO link outage. This method is then implemented into FPGA device.
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Wireless thermostat
Králíček, Martin ; Viščor, Ivo (referee) ; Kincl, Zdeněk (advisor)
The Master’s thesis discusses wireless thermostat for a control boiler. In order to complete the project we have to design and realise the whole project with software design. The system contains two units, a master control and a measurement of regulation units. The project initially talks about regulation of heating systems for family houses and larger buildings like schools and stores for example. Next, the project describes the control and regulation units and their potential extension for effective and economical operation. Both units are equipped with microcontrollers, which these control each of function. The communication between both units is provided by wireless interface in free radio band ISM. There is a user interface for the master control unit’s regulation process. The measurement and regulation unit has only the possibility to switch between manual and automatic control for regulation of heating system.
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Acquisition unit for analog filters measurements
Vríčan, Peter ; Kubíček, Michal (referee) ; Kincl, Zdeněk (advisor)
This thesis deals with frequency filters and their realization. The main aim was to design conception and involvement of acquisition unit for analog filters automatic measurements. Acquisition unit consists of its bulb with seven analog filters. Contained filters are 3 active analog filters ARC of second series ( LP, HP, BP ), 3 passive analog filters RC of second series ( HP, BP, BS ) and the filter with lossless grounded gyrator. Whole measurement, frequency setting of generator, measured filter selection and data sending is automatically operated by microprocessor controlled by PC. Communication between microprocessor and PC is realized via USB interface. Unit realization, testing and creating of control software was the next goal of thesis. Its achieved parameters from measurement of filter frequency responses are compared with responses of the simulations of the same filters using PSpice. The thesis is focused also on causes of differences between real and theoretical filter responses, which includes mainly tolerances and parasitic properties of applied components.
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Communication protocols for Free-Space Optical links
Šedo, Ondrej ; Kincl, Zdeněk (referee) ; Kolka, Zdeněk (advisor)
This master’s thesis is focused on behaviour of the TCP/IP protocol on free-space optical link which is affected by the effect of atmospheric turbulence. This causes fluctuation of the received optical power and therefor bit error rate changes. In the simulation model short-time bit error rate is calculated from random generated received optical signal and then used in time-domain analysis of the OMNeT++ network simulator. A buffer in transmitter is designed based on simulation results. It pauses the data transmitting in cases of FSO link outage. This method is then implemented into FPGA device.
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Multifunction display for ground power supply
Kincl, Zdeněk ; Kubíček, Michal (referee) ; Kolka, Zdeněk (advisor)
The aim of this thesis was to design a concept and circuit for multifunction display. This unit is used in ground power supply for preflighting preparation of army helicopters. Multifunction display measures voltages and currents of AC and DC generators, teperatures of cooling air and fuel quantity. Display indicates a operational and fault states of ground power supply. The main element of multifunction display is 32-bit microprocessor from the manufacturer NXP, family ARM7. All information are displaying on graphic vacuum fluorescent display GU256x128.
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