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Methods of acoustic signal sources impedance matching for their further processing
Havelková, Nikola ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
The purpose of this bachelor thesis is to get acquainted with the theoretical areas related to the issue of impedance matching using the so-called DI boxes. It is mainly the theory of balanced and unbalanced signal, parameters typical for DI boxes (THD, impedance, bandwidth, dynamic range, etc.), knowledge about the transformer, respectively about the coils, or last but not least the issue of operational amplifiers, which is for designing of active DI box absolutely essential. The specifications of the designed DI box based on this theory are subsequently determined and compared with commercially available models. The main target is to achieve better figures or at least get closer to them. Furthermore, the circuit diagram is designed and optimized to achieve predetermined parameters using simulation in the Multisim program from National Instruments. Regarding the resulting specifications of the DI box, a printed circuit board is designed to build a prototype of the device. After its completion, a test gauging using APx525 is done and the results are compared to the target figures.
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Induction heating for small applications
Hrbáč, Lukáš ; Foral, Štěpán (referee) ; Krbal, Michal (advisor)
This bachelor’s thesis covers the topic of induction heat and possible solutions for small applications. There is theoretical knowledge needed for design of an induction device and also principles of induction heat. In the thesis, there is described resonant circuit, which is the main part of induction heating device. Furthermore, usual interpretations of driver and power circuits are analyzed. This work describes different ways how to adjust operating frequency to achieve better results. This thesis also includes verification of functionality of such a device, measurement of operating parameters and efficiency. Instructions for laboratory exercise dealing with induction device are attached in the appendix.
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Methods of acoustic signal sources impedance matching for their further processing
Havelková, Nikola ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
The purpose of this bachelor thesis is to get acquainted with the theoretical areas related to the issue of impedance matching using the so-called DI boxes. It is mainly the theory of balanced and unbalanced signal, parameters typical for DI boxes (THD, impedance, bandwidth, dynamic range, etc.), knowledge about the transformer, respectively about the coils, or last but not least the issue of operational amplifiers, which is for designing of active DI box absolutely essential. The specifications of the designed DI box based on this theory are subsequently determined and compared with commercially available models. The main target is to achieve better figures or at least get closer to them. Furthermore, the circuit diagram is designed and optimized to achieve predetermined parameters using simulation in the Multisim program from National Instruments. Regarding the resulting specifications of the DI box, a printed circuit board is designed to build a prototype of the device. After its completion, a test gauging using APx525 is done and the results are compared to the target figures.
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Data acquisition modules
Štreit, Zdeněk ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
This bachelor’s study focuses on design, realization and practical measurement of galvanic isolation temperature transmitter’s accuracy for the Pt 100 platinum resistance temperature detector. The beginning of the study describes the kinds of sensors for resistance temperature measurement, their division and charecteristics, whereby the stress is put on platinum resistance temperature detectors. The other part of this bachelor’s study depicts methods of connecting the platinum detector to a measuring circuit and evaluation of such a signal. It contains options of further processing of the measured signal using either various connections of operating amplifiers or specialised circuits. Issues with evaluation of the platinum detector’s signals as compensation of an input conductors‘ resistance and linearization of a platinum detector‘s course are solved. The following chapter introduces causes of galvanic isolation in a measurement chain and its principle. Electronic components and circuits that ensure the galvanic isolation are also discussed. The final part the this bachelor’s study is devoted to my practical proposal of a circuit solution for the platinum detector’s with galvanic isolation transmitter. It describes my proposed design of the transmitter’s input part, possibility of the Pt 100 detector’s linearization and galvanic isolation using a linear optocoupler. The transmitter was measured at several surrounding temperatures and the results were processed into tables and charts that are presented in an appendix to this study. This bachelor’s study goal was met as I have managed to produce the temperature transmitter according to the request. The worsened accuracy of the output voltage at temperatures lower or higher than +20°C can be eliminated by using resistors with lower temperature coefficient in a measurement bridge.
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Switching power supply with zero voltage switching
Pešl, Jiří ; Pavlík, Michal (referee) ; Boušek, Jaroslav (advisor)
Diploma thesis describes the design of an switched mode power supply with switching at zero voltage for driving the anode of Anode-layer type ion source. First aim of thesis is ion sources and specialy Anode-layer type of ion source in detail. Main aim of thesis are important aspects of the design of switching mode power supply, which comes later the detailed construction of an switched mode power supply with output voltage 2800 V at output power 2800 W.
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EOG signal processing using Arduino
Typovský, Viktor ; Králík, Martin (referee) ; Harabiš, Vratislav (advisor)
This bachelors thesis deals with scanning and processing EOG signal. Processing means displaying EOG signal detection and eye movement. The theoretical part is first described the formation and properties of EOG signal. Furthermore, they describe factors affecting EOG. The practical part is then given proposal hardware solutions to capture this signal and processing algorithm. Scanning EOG signal is realized by means of the instrumentation amplifier. Its filtration is used lowpass Sallen-Key. It was decided to maintain during scanning DC component of the signal. But that was a problem regarding the electrode potential. This problem would be resolved by the proposed compensation circuit. Processing the resultant signal is then performed in an environment Processing using Arduino platform. EOG imaging algorithm and motion detection functions and is given.
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High-Voltage Structures for Galvanic Isolation in Integrated Circuits
Ptáček, Karel ; Husák, Miroslav (referee) ; Zemánek, Miroslav (referee) ; Boušek, Jaroslav (advisor)
Tato dizertační práce představuje novou techniku laterární rezonanční vazby, která je využita v návrhu galvanicky izolovaného posouvače úrovně, který je následně implementován v 800 V půlmůstkovém kontroléru pro průmyslové aplikace. Ve srovnání s tradičními galvanickými izolátory jsou výrobní náklady tohoto řešení nižší. Pro aplikace vyžadující vyšší úroveň galvanické izolace je popsán následný vývoj galvanicky izolovaného posouvače úrovně, který využívá pouze jeden galvanicky oddělený posouvač úrovní pro komunikaci v obou směrech, což výrazně snižuje plochu struktury izolátoru. Jako součást následného návrhu je představen galvanický izolátor který je schopen přenášet analogovou hodnotu napětí. Analogový izolátor byl testován v reálné aplikaci síťového spínaného zdroje jako náhrada standardního optočlenu. Tato konstrukce umožňuje integraci primárních a sekundárních obvodů v jednom pouzdře, což umožní snížit složitost a cenu spínaného zdroje.
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Design of a pressure monitor for biomedical applications
Tenora, Jan ; Kolka, Zdeněk (referee) ; Biolková, Viera (advisor)
The goal of this bachelor’s thesis was to gather requirements for the realization and functional features of the proposed pressure monitor. Based on the collected requirements, the block diagram and also the complete schematic were proposed. Then the printed circuit board was designed, made and fitted. This board was placed into prepared box together with other components. Finished equipment was tested, set and also precision was checked by its measurement. Finally, user guide and also service manual were written.
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Laboratory DC power supply 30V 60A
Gábel, Marián ; Vorel, Pavel (referee) ; Martiš, Jan (advisor)
The master thesis deals with design of a switched DC power supply with output parameters of 30 V 60 A. The power supply uses the connection of two single switch forward converters with opposite phase. The topology was chosen based on a comparison of specific schematics in the first part. The body of the thesis is covered in chapter which deals with design and analysis of power circuits of the converter. The chapter describes detailed design of pulse transformers, dimensioning of semiconductors and cooling system of the converter. For lower power losses, the system of synchronous rectifying is chosen at the output of the circuit. The regulation of the output is based on cascade structure with a superior voltage and dependent current loop. Appropriate over current protection is provided by sensing the output current and using current transformers for primary current measure.
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Oscilloscope supply source with a low parasitic capacity of the galvanic separation
Tauš, Michal ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
This thesis deals with design of a DC/DC converter for powering the oscilloscope. The main parameters for selecting a suitable inverter are: galvanic isolation of input and output parts of the inverter and low parasitic capacitance of galvanic isolation. The required power of the inverter is 100 W and the output voltage is 325 V. The introduction briefly explains why the DC/DC converter with transformer will be used. The first part of the work deals with the selection of a suitable types of DC/DC converter with transformer for powering the oscilloscope. The next part is devoted to designing of the power parts of resonant converter and single acting flyback converter. This is followed by a complete design of a single-acting flyback converter, including the realization and measurement of the time courses of important quantities.
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