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Drivers for power switching transistors GaN MOSFET
Fiala, Zbyněk ; Pazdera, Ivo (referee) ; Vorel, Pavel (advisor)
The thesis describes the procedure during the proposal of the driver circuits for the GaN MOSFET transistors, which are known for their fast switching especially. In the first instance of this thesis the issue of GaN MOSFET transistors is described and also the thesis describes the different types of MOSFET transistors in the way of their electrical and mechanical attributes. The specific type driver circuit is stated in the thesis, which was selected in the semestral thesis. For this circuit the boost converter with an output power 600W and high switching frequency 800kHz was proposed as an attempt measurement circuit. This boost converter was measured after its construction was done. The waveforms captured by the oscilloscope are commented also. In the conclusion the assessment is done about this new technology of power switching transistors.
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Research in the preparation of self-leveling anhydrite screeds
Běťák, Rostislav ; Smetanová,, Lenka (referee) ; Gazdič, Dominik (advisor)
Bachelor´s thesis extends the existing results in the field of research of an anhydrite binder and it is divided into two sections. The theoretical section is focused on general sulphate binders and anhydrite binders. Further it contains the description of the technology of floor screed application, demands of norms and comparison of screeds, which are used nowadays. The experimantal section concrens with the research and the development of an anhydrite binder and mainly the utilization of this binder in the field of cast self-leveling floor screeds. For the preparation of self-leveling mixtures were used two different types of anhydrite and theirs main features were compared.
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LED driver with synchronous rectification
Hodáňová, Adéla ; Šotner, Roman (referee) ; Kubíček, Michal (advisor)
The main goal of this diploma thesis is to compare two circuits designed for LED powering with output current of units of Amperes. Both circuits are based on step-down converter topology, one with technology of synchronous rectifying and the other one without it. Calculations and selection of used components with real prototypes were made for both selected circuits. All selected components meet automotive qualification requirements for discrete products. Produced prototypes were compared in terms of functionality, efficiency, EMC and thermal radiation.
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Methods of Excitation of Sulphate Binder Based on Anhydrite
Adameková, Paulína ; Vavrušková,, Lenka (referee) ; Gazdič, Dominik (advisor)
The presented bachelor thesis is focused on excitation of a sulfate binder based on anhydrite. The thesis is conceptually divided in a theoretical and experimental part. The theoretical part is devoted to the general theory of sulphate binders and anhydrite mortars, at the same time, there is brought view on process of production of historical gypsum binders as well as the current use of anhydrides. In theoretical part of the thesis, there is included study, which is focused on previous research in presented problematics at the THD institution. In the experimental part of the thesis, which is primarily focused on the method of internal excitement, there is elaborated design and mineralogical analysis of input feedstocks as well as the internal waking process itself with subsequent qualitative evaluation using XRD and REM analysis.
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Power Converter for DC Welding
Vranák, Daniel ; Červinka, Dalibor (referee) ; Patočka, Miroslav (advisor)
The masters thesis was focused on design and realization power converter which should worked as welding machine. It was necessary choose suitable type converter. Next, it was needs design of pulsed transformer, output filter choke and design of semiconductors which were in power part welding machine. It was also designed control and driver circuits. This parts which were used on construct the converter were made and tested too.
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Study of Hydration Process of Anhydrite Binders
Verner, Filip ; Vavrušková,, Lenka (referee) ; Gazdič, Dominik (advisor)
The presented work deals with the study of hydration processes anhydrite binders with external exciters. Work is divided into two parts. Conceptually is this work divided into two parts The theoretical part of study contains general theory of gypsum binders, anhydrite binders and research at the institude THD. In the experimental part deals with proposal of recipes, making of samples and subsequent determination of main technological tests and monitoring hydration process by the XRD and DTA analysis.
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