National Repository of Grey Literature 15 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
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.
Switching LED Driver Using SEPIC Structure
Servít, Daniel ; Kincl, Zdeněk (referee) ; Kubíček, Michal (advisor)
Semestral thesis describes switching LED driver. It also deals with topology SEPIC. The following text provides other topologies performances and their features. There are also different types of integration circuit for construction and DC/DC converter presented.
HVAC unit for optical head
Janošík, Tomáš ; Šotner, Roman (referee) ; Kincl, Zdeněk (advisor)
This thesis deals with the design of a HVAC unit for temperature regulation inside an optical head. The unit is completed by functions which optimize its reliability such as checking of fan, heating element, monitoring a supply voltage and saving operating information into the memory. The device communicates with PC via serial interface RS-485. There is also described the possibility to switch the unit to a manual mode, in which the temperature interval is setting by a potentiometers. Solution of this thesis is function prototype.
Switching LED Driver Using Buck-Boost Structure
Šmerda, Jaroslav ; Kincl, Zdeněk (referee) ; Kubíček, Michal (advisor)
Control and driving high luminous LED is an issue that is dealt, because the technology of LED have grew in recent years. The power of these diodes is supplied almost always with DC converters. These converters operate on the principle of switching power supply, and they are devices with high efficiency. Because of the high efficiency of converters in combination with a high luminous LED leads to very efficient energy processing to light. This project describes how to select the right converter for a specific application of LEDs. There are described basic converter topologies, descriptions of their activities and LED wiring example to the converter.
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.
Practical testing of methods for analysis of reliability in specific circuit applications
Buba, Ondřej ; Kincl, Zdeněk (referee) ; Šotner, Roman (advisor)
This diploma thesis deals with the method which are useful for analysis of reliability in specific circuit applications. It also deals with fault analysis in frequency, time and DC domain. Methods for these domains are described in other chapter of this thesis. Finally methods for diagnostics analog circuit are evaluated based on simulation and practical testing of selected methods.
Analog Circuits Faults Diagnosis
Váško, Ondřej ; Kolka, Zdeněk (referee) ; Kincl, Zdeněk (advisor)
The main goal of this work is to present the issue of testing analogue linear circuits in terms of diagnosis of single components for which it is sought to prove their nominal values. It is necessary for the work to introduce methods of describing linear circuits via the node voltage method (MUN), and production of transmissive functions. The Matlab and PSpice programmes are used to do the diagnoses. The testing of single parameters of the circuit is carried out through proper placing of testing points in the circuit the way in which their number is as small as possible. Through transmissive functions we indirectly state the values of components operating on calculated frequencies. The set of frequencies for the components is figured out using the stochastic method.
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.
Advanced waterproof flashlight for extreme condition
Šerík, Martin ; Kubíček, Michal (referee) ; Kincl, Zdeněk (advisor)
The work is focusing on the search for available solutions concerning the choice of components for advanced waterproof flashlight for extreme conditions and on building this device. After comparing the individual parameters the following components were selected: as a source of energy - four AAA batteries eneloop distributed by Sanyo, high-brightness LED CREE XP-G and microcontroller ATtiny24 distributed by Atmel. The user interaction is realized by support of capacitive touch buttons and the charging of the lighting device is wireless. The light is placed on the handlebar using a specialized holder.
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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