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Design of Audio Power Amplifiers
Gasnárek, Jiří ; Kratochvíl, Tomáš (referee) ; Šebesta, Jiří (advisor)
The aim of the bachelor's thesis is the description of design and construction audio power amplifiers. This topic is very voluminous and therefore I limited it to basic familiarization with options of bias point placement, connection of power transistors and requested properties of audio power amplifier. It is requested to reach a balanced amplification in transferred frequency band (20 Hz – 20 kHz), to eliminate passage distortion by linearization of passages, to stabilize the amplifier by negative feedback and minimize the signal distortion in limitation by suitable concept of the DC source. Following part contains a suggestion of end transistor properties based on requested output and impendance, their choice (2SC5200, 2SA1943) and calculation of expected heat lost of the amplifier. From known transfer temperatures is set a request on an end transistor cooler. The final part deals with a sketch of scaling way of amplifiers, assumed value and objective comparison of modules. I discuss there possibility of subjective comparison by listening to the same part of sound recording via both modules.
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Voltage converter with microcontroller
Jedlinský, Lukáš ; Patočka, Miroslav (referee) ; Huták, Petr (advisor)
In these baccalaureate work is buckthorn power supply mobile computer from automobile nets. Main thought is using suspense raising equable changers with high working frequency. To regulation and operating sources will used microprocessor series AT Tiny. Will also be effected project programmatic equipment and his implementation to the integrated perimeter and project PCB and by herself realization hereof perimeter.
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DC/DC step-up converter for notebook
Škunda, Michal ; Klíma, Bohumil (referee) ; Červinka, Dalibor (advisor)
Given bachelor’s thesis devoted to a proposal and implementation of transducer STEP-UP for supplying of notebook in car. Introduction presents dividing of switching power supplies followed by a choice and a proposal of power supply. In this work we can find the specific proposal of inductor, the proposal of electronic connexion and the proposal of PCB layout. There is a software EAGLE used for the design of PCB layout. In the last part of work there are particular courses of current and voltage that characterize power supply pictured. The work contains measured load characteristic of switching power supply loaded by notebook as well. Notebooks need to have quality power supplies that is why there was a special attention paid to the quality of supply and its electric parameters.
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Basic Measurement of Dynamic Properties of Amplifier with Bipolar Transistor
Repčík, J.
The aim of this article is to analyze the theoretical basis of amplifier with bipolar transistors measurement. In particular, this contribution focuses on a convenient way of setting the operating point of an amplifier with BJT and subsequently on measuring particular dynamic properties. To accomplish this, the automated laboratory measurement was developed, by using appropriate measurement devices along with LabVIEW software.
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DC/DC converter
Němec, Martin ; Kuzdas, Jan (referee) ; Procházka, Petr (advisor)
This project deals with transistorized converters in particular a four-quadrant bridge. The main part of project discusses the drivers of transistors and a possible way of controlling a converter. The proposal of control electronics and the regulation structure are involved in the second part. This project also includes a construction of an apparatus which will be used as a teaching material.
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Computer modeling of MOSFET transistor
Major, Jan ; Harwot, Ondřej (referee) ; Pokorný, Michal (advisor)
Work is focused on computer modeling of PN junction and MOSFET transistor in the program COMSOL Multiphysics and in program TiberCAD. The text is discussed on the drift and diffusion in semiconductors. Also shown is a method of modeling the PN junction and MOSFET transistor in the programs and compare models.
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The inverter for arc-welding
Vaculík, Josef ; Klíma, Bohumil (referee) ; Červinka, Dalibor (advisor)
This diplom thesis theoretically deals about principle of pulse welding current source. Work explains operation principle of the single acting transmit converter used in realized construction and mention the others examples of converters types. Goal of the work is design individual parts of source : input filter, pulse transformer, output inductor and power semiconductors components. Thesis also contains description of the regulation circuitry of the converter, auxiliary power supply and pre-driver for power transistors. If everything will be all right prototype of the source will be assembled and measured. Results will be compared with theoretical assumptions.
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The graphene structures suitable for field effect transistors
Kurfürstová, Markéta ; Bartošík, Miroslav (referee) ; Mach, Jindřich (advisor)
This bachelor’s thesis is focused on preparation of graphene structures suitable for field effect transistors. In the first section, graphene is characterized in terms of its properties and prepataion methods. The second part sums up semiconductor technology, focusing on transistors with graphene layer. Next, electron beam litography method is presented, which had been used for preparation of the structures. Finally, an experimental procedure of graphene structures manufacture is described.
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Multilayer semiconductor devices
SEDLÁK, Jiří
There is illustrated principle of semiconductors in the first chapter. A description of three semiconductors elements transistor, thyristor and triac is in chapter two, three and four. The main target is to create multimedia material for study in form of www page for students in electrotechnics branch. These pages will be a part of the essay and also I will write it to CD and it takes place in university system eAMOS.
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