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Switching power supply based on high voltage Si/SiC MOSFET transistors
Darida, Slavomír ; Procházka, Petr (referee) ; Pazdera, Ivo (advisor)
Bachelor’sthesis is based on semestral thesis, which was focused mostly on problematic of switching power supply design with following parameters 3x400V AC/15V DC, 3,333A. Bachelor’s thesis adds algorithmic calculations of converters winding parts for forward converter and also for flyback convertor. These algorithms are created with Matlab. Next extension is design of two different forward convertor’s conceptions. Current mode PWM regulation is the first one and voltage mode PWM regulation is the second conception. Because current transformer is needed for secondary current sensing in first conception, its design is added also with algorithm calculation. Important is that both of these conceptions are using same excitation system. Excitation system functional tests are classified at the end.
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Drivers for power SiC MOSFET transistors
Vitek, Vojtech ; Vorel, Pavel (referee) ; Procházka, Petr (advisor)
The bachelor thesis describes gate driving principles of power MOSFET transistors made of silicon carbide material. The autor's aim is describing a different types of gate drivers and basic rules during process of designing gate drivers. In the theoretical part, the author will mount printed circuit board of gate driver designed on UVEE FEKT VUT Brno and verify functionality.
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Design of switching class audio power amplifier
Bronec, David ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor thesis is dealing with the issues of the switched category output amplifiers and its aim is to design and to construct a stereo amplifier with the energy output about 100W. The amplifier is constructed in the switched category D. The design of the corrective preamplifier with the correction of depths, heights and the balance functions is also described. Furthermore, this thesis deals with the description of the switched power supply with the TOPswitch control circuit. The design is also supplemented by the simulations and the printed circuits of each part. There are also some photographs of the device and the measurement protocol is included too.
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Hybrid headphone amplifier for the high-end listening and performance
Čacký, Adam ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor´s thesis describes the design of a high quality small portable headphone amplifier for dynamic headphones. Part of the work is theoretical assumptions for the optimal design and implementation of peripheral involvement, comparing the properties of components used and the resulting parameters of modeled device. Analyses of the electrical quantities of the circuit created in simulation software are enclosed.
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Traction DC/AC inverter 2,5kW for an induction machine of an electric garden tractor
Krist, Petr ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This thesis deals with the proposal of power 3-phase DC/AC inverter for an induction machine of small garden tractor. It concerns the choice of a voltage level of DC link, dimensioning of the power circuit, drivers for power transistors, implementation of metering and protection and also processor driving. The whole thing ends at proposal of PCB in the software program called EAGLE and PCB manufacturing. So we also check if the theoretical calculations are correct and if the whole drive works.
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Control system for cantilever gates
Koždoň, Ondřej ; Arm, Jakub (referee) ; Bradáč, Zdeněk (advisor)
The goal of this bachelor's thesis is to design a battery powered control system for wireless controlling swing gate (may be used for cantilever sliding gates or garage doors). This system is designed as a small electronic system with necessary Inputs/Outputs (I/O) and an Input for charging a battery from solar cells. The result of this bachelor's thesis are two main PCBs with dimensions of 5×5cm for controlling the gate and remote controller with dimensions of 2,3×4,4cm. Main PCB allows adding more remotes, deleting all remotes and modes for the way of controlling the gate (opposite direction, open only, close only, open wing, close wing, stop the gate) and selecting Master/Slave gate. Communication works on frequency of 434MHz.
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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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Binders and Mixtures Based on Calcium Sulfate
Hanáček, Jan ; Smetanová,, Lenka (referee) ; Gazdič, Dominik (advisor)
This Diploma Thesis deals with the research and advancements in the field of sulphate binders, especially the anhydrite binder. The theoretical part of the thesis is dedicated to the fundamentals of sulphate binders and anhydrite binders. Its second part also introduces standard requirements for screed coatings together with technological methods of their application. Practical part of the thesis looks at the research and production of anhydrite binder with special emphasis on self-levelling compounds. Various types of plasticizers were used in these compounds and their effectiveness and final product quality are compared.
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Field Programmable Gate Arrays Usage in Industrial Automation Systems
Nouman, Ziad ; Kadaník,, Petr (referee) ; Kobrle,, Pavel (referee) ; Klíma, Bohumil (advisor)
Tato disertační práce se zabývá využitím programovatelných hradlových polí (FPGA) v diagnostice měničů, využívajících spínaných IGBT tranzistorů. Je zaměřena na budiče těchto výkonových tranzistorů a jejich struktury. Přechodné jevy veličin, jako jsou IG, VGE, VCE během procesu přepínání (zapnutí, vypnutí), mohou poukazovat na degradaci IGBT. Pro měření a monitorování těchto veličin byla navržena nová architektura budiče IGBT. Rychlé měření a monitorování během přepínacího děje vyžaduje vysokou vzorkovací frekvenci. Proto jsou navrhovány paralelní vysokorychlostní AD převodníky (> 50 MSPS). Práce je zaměřena převážně na návrh zařízení s FPGA včetně hardware a software. Byla navržena nová deska plošných spojů s FPGA, která plní požadované funkce, jako je řízení IGBT pomocí vícenásobných paralelních koncových stupňů, monitorování a diagnostiku, a propojení s řídicí jednotkou měniče.
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