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Utilization of MERS in heavy current engineering
Vetiška, Vojtěch ; Procházka, Petr (referee) ; Huzlík, Rostislav (advisor)
This graduation thesis is aimed in usage of MERS circuits in high-current electroengineering. The MERS circuit is a serial variable capacitor which capacity is possible to change by the help of switching of semiconductor components. On beginning of the thesis I shall acquaint you with usage of the MERS circuit. It will be sketched out their basic circuitry, the operating method, possibilities of transistors switching and calculation of the capacity capacitors for particular controlling method. On the prepared device we shall accomplish the predefined measurement. Furthermore we shall create the simulation by means of the Matlab programme. In the end we shall compare the results of the simulation with measured values.
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CONVERTER DESIGN USING SEMICONDUCTORS BASED ON SiC
Kharchenko, Vadym ; Procházka, Petr (referee) ; Kuzdas, Jan (advisor)
This work builds on a semester project 2 from the winter semester of this academic year. The aim of this thesis is the design of converter using semiconductor components based on SiC technology. This converter is used in the construction of quick charger for electric vehicles. The design of this converter must be based on the requirements for compliance voltage safety. It describes the design of power components used in the construction of this facility, the determination of their losses and determines the overall efficiency of the converter. There is also proposed mathematical model of high-frequency transformer and made his simulation in Matlab-Simulink.
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Production automation of transformer components based on industrial robot
Procházka, Petr ; Kubela, Tomáš (referee) ; Pochylý, Aleš (advisor)
The bachelor´s thesis focuses on the automate process of primary transformer´s soldering. My work is to assess proceedings that guarantee that tolerances given by the controlling company shall be as accurate as possible. Final version of the product is modified in such a way to meet a size criterion as well as strength, anti-corrosion, space and price standards. The final version of the product is tested by the robot during the process. The main task is the verification of the size stability during the operation. One of the point of my bachelor´s thesis is to descripe a plan of automate workplace. The main reason for designing a plan of automate workplace is to help employees and facilitate from demanding work in the process of primary coil soldering.
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Charger for lead-acid batteries
Kopuletý, Ondřej ; Procházka, Petr (referee) ; Ondrejček, Vladimír (advisor)
This bachelor‘s thesis deals with the modification, construction and testing of lead-acid battery chargers. It is described the principle of charging the batteries and individual topology of the switching power supplies. The original schematic diagram is taken from the thesis of Josef Kadlec. Diagrams of a power and control circuit have been modified. The topology of the charger is two switch forward converter with pulse transformer. The charging method is constant voltage with current limiting.
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Resistance saw
Kalčík, Petr ; Minárik, Vladimír (referee) ; Procházka, Petr (advisor)
This work is focused on the design and construction of component parts of resistance saw. Mechanical parts consist of a movable bracket and a taut cutting wire of Constantan. Electrical parts are designed to supply and control temperature of the cutting wire. The current intensity in the cutting wire is compared with the required current intensity. The difference of these two measurements is fed into a PI - controller. The next part is a PWM generator which generates the square wave signal. The pulse ratio of this signal is proportional to the required temperature of the cutting wire. This signal switches a switching converter that consists of a power transistor P-MOSFET IRF5210 and a diode MBR20100CT. Choking coil with a ferrite E core and with the cutting wire is connected to the output of the converter.
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Low-power electrical sources
Kotásek, Ondřej ; Pazdera, Ivo (referee) ; Procházka, Petr (advisor)
In the theoretical section describes the different types of DC / DC converters, which are among the best known. It's a drive with one storage element, decreasing and increasing non-inverting converter, an inverting converter with a common choke and Čuk’s changer. The second part deals with the actual design and implementation of the two input sources for low power. Here are described two main components designed for each circuit. Furthermore, the work to create schematics and PCB in Eagle. Finally, learn how to solder components on the PCB made.
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Controllable switching power supply 0-1000 V / 100 W
Hofmann, Oldřich ; Procházka, Petr (referee) ; Martiš, Jan (advisor)
The thesis deals with the design and construction of a switching power supply with output voltage adjustable from 0 to 1200 V and rated power of 120 W, which will be used to replace the existing high voltage power supply for the irreversible electroporation (IRE) device developed at UVEE FEEC BUT. The thesis focuses on a basic description of the IRE device, a description of usable converter topologies and a selection of the best topology for the required purpose. The selection of the control circuit concept and its design are also integral parts of the thesis. The final part of the thesis contains the assembly of the power supply and the measurement verifying its function.
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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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