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Laboratory Switching Power Supply
Šneidr, Radim ; Petržela, Jiří (referee) ; Šebesta, Jiří (advisor)
The topic of my bachelor´s thesis is a solution to a laboratory switching power supply, look at their benefits, disadvantages and characteristics in terms of EMI. The aim this work is also to design the concept of two outputs switching supply with monolithic circuit, LM2576 with the inclusion of a current limiter and implementation of a test version which will use basic measuring. Further, design a general scheme and the mechanical solution of a power supply including measuring modules. Design layout of printed circuit, complemented with thorough testing.
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Uninterruptible AC Power Supply
Jansa, Josef ; Kubíček, Michal (referee) ; Šebesta, Jiří (advisor)
This work deals with the standby power sources for heating circulating pumps for solid fuel. This work also deals with specific design UPS for circulating pump house 230 VAC maximum power of 50W, including automatic battery charger 12V and monitoring units.
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Fishing alarm in LPD band
Dufek, Ivo ; Šebesta, Jiří (referee) ; Frýza, Tomáš (advisor)
The main objective of this project is analysis, design and construction of three channel wireless extension box for electronics bite alarms in LPD band. Wireless ex-tension box set consist of transmitter and receiver. Both of them are based on Aurel hybrid modules and Atmel AVR microcontrollers. Microcontroller in transmitter media-tes processing input data, their coding, securing and transmitting. At the receiver side microcontroler has to interpret data from hybrid module and start correct visual and acoustic signalization. Construction of this extension box set is described in two independent chapters. The solution contains brief introduction, description of each function block, some im-portant components, general schematics, design of PCB and description of the firm-ware. The last chapter is common for transmitter and receiver and describes recom-mended antennas.
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Special application of VoIP
Lembard, Tomáš ; Šebesta, Jan (referee) ; Fuchs, Michal (advisor)
The aim of this master's thesis is suggestion and following realization of voice transmission over the local network equipment and a description of used circuits and solutions in terms of hardware and software. This thesis deals with digitization of low-frequency signals, the structure of IP and UDP protocols, implementation of TCP/IP stack cIPS
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Digital Signal Processor for Handheld RFID Reader
Benetka, Miroslav ; Zamazal, Michal (referee) ; Šebesta, Jiří (advisor)
This diploma thesis deals with design and realization of a module for a digital signal procesor, for handheld RFID reader working in UHF band. It utilises a special chip EM4298 for RFID signals processing. Module is controlled by the microcontroller ATmega32L, which communicates with the PC through USB bus. Settings in EM4298 is made by a service program which processes received identifying data obtained from tags. Source codes for microcontroller are created in AVR Studio 4.13 program. Source codes for microcontroller are created in C++ Builder 6.0 program. Further thing is Desing and realization of analog interface and a UHF transceiver for wireless communication with tags. A Webench program was used for the analog interface design, which is freely available on the internet. For verification of parameters of the analog interface it was used PSpice 10.0 program. The UHF transceiver is build-up with a MAX2903 chip (transmitter) and AD8347 (receiver) and transmitting and receiving antennae.
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Digitally Controlled Switching Power Supply
Krška, Vlastimil ; Zamazal,, Michal (referee) ; Šebesta, Jiří (advisor)
This master’s thesis is an introduction to switching mode power supplies, especially focused on digital control. It summarizes the basic topologies of switching mode power supplies, and discusses the fundamental issues of digital power supply control. It also summarizes basic informations about Piccolo microcontrolers, about experimental kit and about main parts of sample source code. Also is described here own implementation of the control law and the theory and implementation of maximum power point tracking. The conclusion of this thesis deals with implemantation a testing of the designed digitally controled switching power supply.
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Synchronization of measuring devices by optical fibres
Petr, Ondřej ; Šebesta, Jiří (referee) ; Dřínovský, Jiří (advisor)
The aim of this work was to get acquainted with the possibility of transmission of RF signals using optical cables. And design synchronization modules to transmit the reference signal, so that the source and the receiver of the signal are time-synchronized and mutually galvanically separated using optical cable. To transmit and receive optical signals through optical fiber, I chose the transmitter and receiver of the series HBR- 0400 the company Agilent Technologies.
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Laboratory waveform generator based on DDS
Kret, Tomáš ; Povalač, Aleš (referee) ; Šebesta, Jiří (advisor)
The project concerns about design of function generator based on direct digital synthesis, its software and hardware realisation. It solves generating functions depended on time like sine, triangle and square with variable duty cycle, burst and other functions of frequency sweep, FM and PWM modulation. Next goal is to display user interface on graphic LCD display and to control microcontroler pheripheries of AVR.
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Industrial Signal Processing and Visulalization Using PLC Systems
Hauer, Petr ; Hubík,, Vladimír (referee) ; Šebesta, Jiří (advisor)
This master’s thesis aims to familiarize with the types of signals used in industrial automation technology. Below are the methods for their processing and transfering to the PLC control system It is described method of processing these signals using an industrial controller of the S7 - 300 and a program for creating visualizations SIMATIC WinCC V7.0. The second part of the master’s thesis deals with the implementation of the control software of a specific technological process.
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PH controller for aquarium
Dvořák, Jan ; Fedra, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This bachelor’s thesis deals with the system which is designed as a pH regulator for aquarium water. The first and second chapter are aims to the basic requirements and possibilities on controlling of the potential of hydrogen in water. Main methods of the pH measuring, its controlling and regulation are included. The third chapter presents a design of the pH regulator system. The practical and software solution of this project is presented in the fourth and fifth chapter. There are described in detail the main blocks of the pH regulator - amplifier, galvanic isolator and output power stage. The results of the testing and measuring of the designed subsystems are introduced in the last part of the work.
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