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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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Comparison of switching LED drivers
Káňa, Vojtěch ; Šotner, Roman (referee) ; Frýza, Tomáš (advisor)
This bachelor thesis describes switching LED drivers and their features. Is chosen and compared five integrated circuit, that one of them will be included in two different topologies. Especially in Buck-Boost and SEPIC configuration. Their characteristics and features will be simulated and designed in suitable software. Made equipment will be tested and compared their achievements properties. For a both of these drivers is required specified conditions as constant output current, input and output voltage.
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DC/DC converter
Němec, Martin ; Kuzdas, Jan (referee) ; Procházka, Petr (advisor)
This project deals with transistorized converters in particular a four-quadrant bridge. The main part of project discusses the drivers of transistors and a possible way of controlling a converter. The proposal of control electronics and the regulation structure are involved in the second part. This project also includes a construction of an apparatus which will be used as a teaching material.
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Class D audio amplifier for active loudspeakers
Cupák, Jan ; Punčochář, Josef (referee) ; Kratochvíl, Tomáš (advisor)
This master's thesis deals with design of D class audio final amplifier, which was output power 400 W for 4 ? load impedance. Designed audio amplifier is specifical for active speaker, which consists of satelite speakers and subwoofer. Further more it deals also with other functional blocks, e.g. balanced input preamplifier, active crossover and protection for safety running. Outcome of this work are schemes of each functional blocks of D class audio amplifier, whose functionality was verified by simulation. Thesis also contains full reference material including mechanical arrangement of functional blocks on printed connection board. The conclusion contains the measured parameters of function blocks of produced prototype and complete photographic documentation.
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The inverter based battery charger
Kadlec, Josef ; Pazdera, Ivo (referee) ; Červinka, Dalibor (advisor)
The aim of this master’s thesis is provide detailed information about car battery’s charger with a switching power supply. The kind of this power supply is one-pulsed conducting inverter with transformer. The charger’s rates of nominal voltage are 6 and 12 V. The method of charging is charging by constantly voltage with a current limitation. The values of a current limitations are 0.5A, 5A and 20A. The charger’s maximal current is 50A. This current can help to the accumulator with starting of a vehicle. This device is equipped by indicators which indicate the end of charging.
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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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Study of anhydrite binder
Břicháčková, Jana ; Fridrichová,, Marcela (referee) ; Gazdič, Dominik (advisor)
The present work deals with research in the preparation of sulphate anhydrite binders based. It is conceptually divided into a general theory of sulphate anhydrite binders and binders, focusing in particular anhydrite cast floors, as well as search anhydrite binders of research training at the Institute of THD and study requirements for screed materials, with emphasis on anhydrite screed mix.
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Step-up convertor with transformer
Poštolka, Martin ; Procházka, Petr (referee) ; Hejkrlík, Jan (advisor)
This work focuses on the proposal and realization of high-frequency switching source. It consists of a theoretical and a practical part. The theoretical part includes selection and summary of the parameters of converters which we use. It also includes schemes and visual display of the important continuance of magnitudes. We can also find there the enumeration of advantages and disadvantages of every single converter. Further, it is concerned with the selection of the converter which is most suitable for our work. The practical part consists of the calculation and the solution of the step-up converter with the transformer. The realization and appropriate choice of components follows. There is also described the power supply of the switching transistors and how to operate these device.
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Control system for cantilever gates
Koždoň, Ondřej ; Šťastný, Ladislav (referee) ; Bradáč, Zdeněk (advisor)
In this bachelor's thesis is designed and in detail described a battery powered control system for wireless controlling swing gate. This system is designed as a small electronical system with necessary Inputs/Outputs (I/O) an Input for powering from solar cells and it is equipped with requisite software.
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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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