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Uninterruptible AC Power Supply
Jansa, Josef ; Kubíček, Michal (referee) ; Šebesta, Jiří (advisor)
This work deals with the standby power sources for heating circulating pumps for solid fuel. This work also deals with specific design UPS for circulating pump house 230 VAC maximum power of 50W, including automatic battery charger 12V and monitoring units.
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DC-AC converter 12 V / 230 V for car applications
Jezerčák, Martin ; Šebesta, Jiří (referee) ; Brančík, Lubomír (advisor)
This work deals with a proposal for increasing DC/AC inverter for use in cars to power electronic devices on 230 V. This work is divided into two parts, theoretical and practical. It consists of three chapters. In the first chapter I developed a voltage converter, its breakdown, a breakdown by function, and the usage of individual connections. The proposal converter with the integrated circuit IR2153 is described in the second chapter. In the third chapter I processed readings and I visualized graphical dependencies of converter that was produced and purchased.
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Car Audio Amplifier
Vičar, Ondřej ; Kledrowetz, Vilém (referee) ; Pavlík, Michal (advisor)
Aim of this bachelor´s thesis is design of a four-channel audio amplifier of the power of 4 × 60 W intended for using in cars. The Amplifier is designed with integrated circuits LM3886T and is supplemented by design of a power supply in a form of a voltage converter. The voltage converter is controlled by an integrated circuit SG3525AN and works in push pull topology. All circuits were made and placed in instrument box. On the final device were performed measurements of basic parameters.
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Driver for ultra-bright white LED
Heralecký, Lukáš ; Čožík, Ondřej (referee) ; Levek, Vladimír (advisor)
The aim of this thesis is to study the possibilities of controlling high-brightness white LEDs using circuits operating at high voltages. The job itself is a division of existing light sources and mainly focus on semiconductor technology LED. The following describes the voltage of DC / DC and AC / DC. The work contains a description of the three high-voltage inverters are designed for power LEDs. Finally, it created a draft scheme of the PCB. As a control circuit is chosen ATMEGA 162 microcontroller from Atmel and source for LED diode is formed HV9910 and HV9861 circuits.
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The system of load matching to the energy converter
Halama, Petr ; Mandlík, Michal (referee) ; Drexler, Petr (advisor)
This master’s thesis deals with energy harvesting from the mechanical energy sources. The mechanical energy may be converted into the electrical by means of a vibrational microgenerator. The thesis deals also with the production of energy from different renewable sources. There have been identified conditions for effective transformation of the remaining energy. In order to satisfy these conditions a circuit for load matching to energy harvester has to be used. Four variants of matching circuit have been designed and analyzed in PSpice or LTspice. It has been designed a system of power factor correction controlled by circuit with discrete components and also by microcontroller. For one of these variants a specific integrated circuit has been used. The designed circuits have been built and their parameters haven been determined by measurement.
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Radioactive measurement with geolocation record
Bali-Jenčíková, Kateřina ; Janoušek, Oto (referee) ; Sekora, Jiří (advisor)
This diploma thesis deals with radioactivity research, types of radioactive radiation and radiation detection. There are described types of ionization radiation detectors. The diploma thesis contains the description and principle of the GPS system function. The content is also a proposal with the subsequent realization of a detection device allowing the recording of geolocation. The resulting device is fully mobile with battery status indication. The results are recorded on the SD card.
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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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Inverter for single-phase island network
Klčo, Michal ; Folprecht, Martin (referee) ; Procházka, Petr (advisor)
The thesis deals with a design and construction of voltage converter from 12 V DC to 230 V AC with frequency 50 Hz. Maximum output power of this device is 250 W. As a control circuit has been used IC TL494CN. The device includes undervoltage protection, which is applied if the voltage of the supply battery drops and protection against battery overcharging by solar panel. It also develops a proposal for integration the inverter into the island power system.
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Converter with very low input voltage
Jaško, Michal ; Beneš, Petr (referee) ; Havránek, Zdeněk (advisor)
This Bachelor’s thesis describes a design and testing of an increasing direct voltage converter transforming light energy received by a photodiode to electrical energy with sufficient output voltage to power digital circuits. The theoretical part forms an overview of commercial circuits and the Linear Technology LTC3109 and the combination of Seiko S-822Z20 and S-8353D30MC are chosen as suitable for the further research. The function principles of these circuits are described. In the practical part the maximum output power and efficiency dependences on the internal resistance of the power source of the circuits are measured. Based on the results the characteristics of the Linear Technology circuit with different variants of the input transformers are compared. A modified Seiko circuit with an input photodiode is designed and its function is verified by laser diode powering through an optical fiber.
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Breath Alcohol Tester
Šmíd, Josef ; Rozman, Jiří (referee) ; Chmelař, Milan (advisor)
This thesis works with measuring possibilities of alcohol concentration in the human body, comparison of these methods and possibilities of practical use. It also deals with the design of a simple breath alcohol tester with usage of semiconductor sensor.
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