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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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AC current sensors
Hašpica, Štěpán ; Huták, Petr (referee) ; Patočka, Miroslav (advisor)
Aim of the bachelor's thesis is to anylize chosen types of AC current sensors with focus on design of one chosen type. Sensoring of AC current can be done for instance by current measuring transformator, Hall's sond or Rogowski coil. These ways and types of sensors are disscussed in chapter no. 2. But main focus of thesis is in finding one definite algorithm for current meassuring transformator. New possible way in design is in-depth disscussed in chapter no. 3. Current meassuring transformator, or other types of sensors finds great application in area of power energetics and electronic engineering.
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Switching loss reduction in the switch-mode supplies
Vašíček, Adam ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
The master's thesis covers in its first parts origins and consequnces of the switching losses, basic principles of the various resonant tanks and resonant DC/DC converters. Afterwards the innovative approach of the multiperiod modulation is presented. The main advantages of this kind of modulation include very wide zero current switching region and lowering the switching frequency as the output voltage decreases. In the remaining part of the thesis a prototype converter design is described.
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Switch mode supplies
Kadlecová, Lucie ; Červinka, Dalibor (referee) ; Patočka, Miroslav (advisor)
In this bachelor‘s thesis is described the design and construction of switch-mode power supply with a pulse transformer. It is mainly focused on projecting and putting into practice of the basic functional elements - LC filter, pulse transformer, transistor converter, transistor drivers, rectifiers and control circutory, including experimental testing of the final product.
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Power Converter for the electric DC arc welding
Vranák, Daniel ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
The main aim of thesis was produce a draft power converters for DC arc welding, which would be suitable for use in regular service. For the purpose of the proposal, first must be acquainted with the possible methods used converters whose distribution and explain the principle place in beginning thesis. Next it was transferred detailed design of individual components, which was used for the construction of the power part of the welder.
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Calculation of optimum slip frequency of induction motor for minimisation of its losses
Bednařík, Václav ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This master’s thesis focuses on the minimisation of losses by calculation of optimum slip frequency of induction motor. The next point of this master‘s thesis is supersaturation. Supersaturation must be solved for the size of losses, because of the effect that is cause of the losses, when current increases with saturation. However current is not increase proportionally with increasing saturation, but increases several times more. This problem is included in the calculation of the slip frequency. Optimum of slip frequency is solve for modified gamma model of induction machine. In the main point of this thesis is outlined the process, how the optimum can be found. With same process were already were found the equations, but they were too extensit. In the end is solved the optimum of slip frequency be minimum of the flux density.
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Bruntál city bypass I/45 with connection to the planned northern bypass I/11
Dlhopolček, Michal ; Patočka, Miroslav (referee) ; Smělý, Martin (advisor)
The subject of this master's thesis is a technical study for the east bypass I/45 around city Bruntál and solution for its mutual connection with the planned north bypass I/11. This work seeks for the most efficient and comfortable connection between both bypasses, as well as the safe movement of vehicles on I/45 bypass. One variant has been elaborated in more detail. The reason for elaborating this work is to divert traffic from the center of the city of Bruntál and create an effective connection between both bypasses.
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Current source for the switchgear thermal test
Košíček, Jiří ; Huták, Petr (referee) ; Patočka, Miroslav (advisor)
This thesis describes the design of semiconductor source for laboratory measurements of switchgears. The proposed source is able to use 16-250Hz frequency, fulfilling the standard value of voltage and current distortion. There are explained the theoretical knowledge of various types of inverters without transformer in the thesis. Furthermore, a circumferential proposal of source is made, which includes calculating the desired properties of individual components, their choice from offers from various manufacturers, and subsequently is constructed the total design solution. It is described the control and management of designed source and it is evaluated for the function finally.
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