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Switching Power Supply with Planar Transformer
Pawlas, Andrzej ; Vorel, Pavel (referee) ; Šebesta, Jiří (advisor)
This master's thesis describes the development of switching power supply with planar transformer. Deals with selection of a suitable integrated circuit together with the topology, a purchase of prototype for the reference measurements and debugging its own power supply. Further design and implementation of planar transformer and in the final implementation, debugging, and measurment's its own prototype. Power supply was fully functional and reached the expected parameters.
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SWR and HF power monitor
Gajdušek, Miroslav ; Blansko), (Metra (referee) ; Šebesta, Jiří (advisor)
This work deals with analysis methods continuous measuring systems for measurement standing wave ratio and high frequency power. Reflectometr, provision measuring standing wawe ratio, works in range frequence VHF (145 MHz, 443 MHz), for this width working frequence is used construction reflectometer with directive lead. Measurer HF power works into range 1kW. Further is in work go through problems communications bus for transmission data from unit monitor SWR a HF power into score modulus. With regard to high frequency interference is choice serial communication RS-485 , which is immune against disturbance. Further is designed evaluation unit MASTER, unit SLAVE and modules for measurement power and SWR. In finish is build up the firmware for units.
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Carrier Frequency Generator for Portable Radar Signal Simulator
Filip, Martin ; Raida, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This thesis deals with the analysis and solution source for carrier frequency generator for portable radar signal simulator. This simulator is tunable in the frequency range from 2 GHz to 18 GHz and as it´s frequency source generator is used YIG oscillator for its very high frequency realignment. Simulator provides output power up to 1W on the SMA connector which can be connect to internal antenna by using jumper cable. To achieve this output power will be used by semiconductor amplifier.
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Two-stroke Engine Pre-ignition Controller with Microcontroller
Veselý, Tomáš ; Vorel, Pavel (referee) ; Šebesta, Jiří (advisor)
This paper deals with the problem of two-stroke engine pre-ignition controller with the use of microcontroller for single-cylinder engine and double-cylinder engine. The mechanical design is drawn for motorcycles JAWA and ČZ and for engines of the same mechanical type. The establishment uses non-contact status analysis of engine with non-electric sensor. The very important thing for the design is the simplicity of the establishment. The other important thing is the minimisation of mechanical arrangement of engine and the vehicle as a whole. The importance of this establishment is non-contact switching and the possibility of changing pre-ignition maps depending on the number of rotations per minute, the temperature and the load of the engine.
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Wireless Remote Controller for Linear Repeater
Veselý, Tomáš ; Šebesta, Jiří (referee) ; Rumánek, Jaroslav (advisor)
The project deals with the problems of the wireless remote control of the linear repeater. The implementation is devided into two function parts. The first part is a network focusing on the input of instructions by the user, processing of the information, displaying the actual setting and sending the information on the given instructions. The second part deals with processing of the given information from the first part and its discharging. Both parts are controlled by the microprocessors.
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Automatic System for Load Characteristics of Power Supplies Measurement
Vojtek, Michal ; Dřínovský, Jiří (referee) ; Šebesta, Jiří (advisor)
The target of this work is create device, which will automatic measure values for find out loading characteristics of power supply with help of built-in electronic load. In case, that source of current supply will for example DC/DC convertor, measurement of input current and input voltage will be possible. Then there is no problem with determinate total efficiency of this power supply. Measuring system will be conected via serial interface of type USB with computer. It will be possible to save found out values with help of control program for nother processing. Control unit of whole system will be suitable microcontroller.
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DDS Based High-frequency circuit analyzer
Priškin, Jiří ; Brno), Tomáš Mádr (DCOM (referee) ; Šebesta, Jiří (advisor)
At first this thesis is dealing with the basic principles of network analyzers and afterwards goes to propose conception of a polyscope, as a special type of the scalar network analyzer, designed for magnitude frequency response measurement of two-port devices. As a result of this part of the thesis is the polyscope's block circuit diagram and also selection of key integrated circuits for sweep generator, logarithmic detector and control circuits. As the following part of the thesis is a design of the all basic analyzer's circuits resulting in their schematics diagrams and printed circuit boards, do assembly of all modules and mechanical construction of the instrument and look of the front panel. Some of the tasks is implementation of the firmware and personal computer application able to download measured data from the circuit analyzer via USB and generate chart in Microsoft Office Excel book.
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Educational GPS Receiver
Cséfalvay, Gabriel ; Blansko), (Metra (referee) ; Šebesta, Jiří (advisor)
This work explicates a simple GPS receiver intended for laboratory demonsration of DSSS signal demodulation and apparent distance measurement. The receiver will be able to seek for individual sattelite signals, measure their shift against local oscillator, demodulate navigational data, display information on LCD and communicate with PC via USB.
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Microprocessor control unit with frequency synthesizer for SW radiostation
Povalač, Aleš ; Fuchs, Michal (referee) ; Šebesta, Jiří (advisor)
The thesis is focused on the development of a radioamateur short-wave transceiver. The basic functions, features and parameters are described in the introduction. The bandplan and appropriate types of emission are also included in the introductory part. The frequency synthesis module is discussed in the second part of the document. Emphasis is placed on the direct digital synthesis method (DDS) using modern Analog Devices circuits. The proposed DDS module includes a high-speed clock source. The description of an intermediate frequency module with a demodulator is also placed there. The final part in devoted to the design of a transceiver control panel with a graphical display, a keyboard and a rotary encoder. The firmware for an ATmega128 microcontroller is described in detail at the end of the thesis.
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Development board with 32-bit ARM-based processor
Jůn, Lukáš ; Šebesta, Jiří (referee) ; Frýza, Tomáš (advisor)
The content of this thesis is to create a detailed description of 32-bit ARM-based processors. Reader will be inform about the each one of the family of ARM-based processor, about the options of creating applications for these CPUs. The Applications are commonly developed by using the C/C++ language. This text also deal's with the development environments. These tools are making easier the development of new applications. This thesis also contains a complete design and description of development board with Atmel AT91SAM7S64 MCU (with sample of source code included).
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