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Uninterruble Power Supply (UPS)
Junek, Michal ; Sekora, Jiří (referee) ; Chmelař, Milan (advisor)
This thesis is intent on quality and safety of electrical energy supply from distribution network. There are describe solutions to reduce or to remove the low quality phenomena of electrical energy supply. The thesis is mainly intent on uninterruptible power systems (UPS) as frequently using systems. There are desciribe systems normalization, topology, choosing and limiting disturbing factors. This thesis is intent on designing AC inverter.
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Vanadium cells as a source and storage of energy
Langr, Pavel ; Chladil, Ladislav (referee) ; Novák, Vítězslav (advisor)
This semestral thesis deals with problematics of redox flow batteries, especially vanadium batteries. The first part is focused on describing basic terms, describes redox batteries and explains chemical processes. It also deals with vanadium batteries properties and construction. The second part of the thesis describes diagnostic method of spectroscopy, which seems to be very perspective for examining attributes of vanadium redax batteries.
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Accumulator tester
Pisca, Marek ; Kadlec, Josef (referee) ; Cipín, Radoslav (advisor)
This master´s thesis is dealing with the theory of Li-ion accumulators and theirs charching. In this thesis has been designed accumulator tester for automatic charging and discharging of Li-ion accumulator. This tester is controlled by microprocessor.
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The Autonomous House or Living Grid-off
Chlebný, Radek ; Šlezingr, Jan (referee) ; Macháček, Jan (advisor)
This thesis deals with energy self-sufficiency focusing on the independence of the electric grid. Basic line emanating project form a concrete proposal for autonomous energy supply system. Emphasis is placed primarily on photovoltaic systems, electric energy accumulation and selection of individual components of such a system. Another important part of the thesis is also an economic evaluation of design variations. The thesis also deals with a market research, and thereof derived benefit assessment of each technology. The accompanying chapters are then devoted to the history of autonomous life style or classification of buildings according to their energy performance.
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Dynamic model of the batteries
Milichovský, Miloš ; Vaculík, Sebastian (referee) ; Tošer, Pavel (advisor)
The thesis includes the basic principles of lead-acid, NiCd, NiMH and Li-Ion batteries. There is a description of their features and phenomena that processes in the batteries during charging and discharging. The most important part is devoted to dynamic models of these types of batteries, the parameters that are necessary for their modeling, and testing of absolute error models. Further, the model in Matlab was created which allows the simulation of the GRID-OFF photovoltaic system using the battery model.
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Smart accumulator tester and charger
Mílek, Čestmír ; Trmač, Jiří (referee) ; Michálek, Václav (advisor)
Nickel cadmium and nickel metal hydride accumulators sets are currently used for supplying hand tools (screwdrivers,...). Problems of cheap hand tools are chargers, mostly of it doesn’t use any charging driving circuits. In consequence of it the accumulators are kept incorrectly, which causes lowernig of lifetime. This thesis suggest circuit design Main of intelligent charging system, which enable better battery management, increases battery lifetime and lower load of environment.
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Controlling a power LED using ATtiny
Holubčík, Jiří ; Hanák, Pavel (referee) ; Kubánek, David (advisor)
This master´s thesis puts mind to choice and suggestion of suited type of DC/DC tension converter for power supply of power LED. It shows comparison of available types of accumulators in The Czech Republic and types of DC/DC converters used in construction of the sample. The choice of available source of energy is subordinated to final weight and size of a battery. There are also some explicit requirements for the smallest possible size and highest effictivity. So the choice is aimed only for converters with a simple coil and minimum numbers of switching elements to realize the converter, for example by SMT technology. One of many possibilities is LTC3453 circuit, which is described in this thesis, assembled and measured. On the basis of this circuit the next two samples are assembled. Here I try to suppress problems from previous circuit and expand it´s possibilities by adding the control of luminance via the microcontroller ATtiny. Then is introduced the basic description of flashlight Petzl MYO XP which is available in stores.
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Optimization of hydraulic system for milling machining center
Smíšek, Tomáš ; Ranuša, Matúš (referee) ; Nevrlý, Josef (advisor)
The bachelor thesis is focused on the design of optimized solution of the hydraulic system for milling machining centre. The main points of this work are to assess the current condition, design optimization solutions, construction calculations, final optimized solution and summary of the optimization. The contracting company is HYTEK Ltd. dealing with construction of hydraulic equipments.
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Optimization of hydraulic system for milling machining center
Smíšek, Tomáš ; Horňák, Samuel (referee) ; Nevrlý, Josef (advisor)
The bachelor thesis is focused on the design of optimized solution of the hydraulic system for milling machining centre. The main points of this work are to assess the current condition, design optimization solutions, construction calculations, final optimized solution and summary of the optimization. The contracting company is HYTEK Ltd. dealing with construction of hydraulic equipments.
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