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Switched battery charger
Špatenka, Vojtěch ; Kubíček, Michal (referee) ; Kovář, Jan (advisor)
My bachelor thesis deals proposal of switch battery charger and with an issue of charging lead-acid accumulators. It describes their attributes and charging characteristics. Futhermore, it describes a concept and a construction of a switch-mode power supply for charging of these accumulators. The design of a switch-mode power supply according to the programme PI EXPERT 7, the design of an impulsive compensator, the choise of a framework and a centre core, a full-scale scheme of a connection, the design of a PCB, a materials scheduling and their layout on the plate. A concept of controls of the switch-mode power supply using single-chip microprocessor C8051F320 HQ manufactured by Silicon Laboratories. A scheme of integration, a concept of the printed circuit board and a specification of components. At the end of the bachelor thesis was made a suitable chassis from the polycarbonate material. The results and the evaluation of the basic parameters of the of the switch-mode power supply are included.
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Current sensing with Hall-effect sensors
Štindl, Daniel ; Kovář, Jan (referee) ; Šotner, Roman (advisor)
This master's thesis deals with integrated Hall-effect current sensors. The thesis contains summary of manufacturers of current sensors suitable for low current measurement and comparison of their important parameters. Next objective of the thesis is a design of test board used for evaluation of temperature depedent accuracy of several sensors simultaneously. The device can be connected with PC through USB interface for saving measured values or automated control with other instruments.
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D class audio-amplifier with digital and remote control
Petrgál, Filip ; Kovář, Jan (referee) ; Šotner, Roman (advisor)
The contents of this thesis is design of audio power amplifier in Class D with fully digital control and remote control and is divided into two parts . The first part is devoted to the basic principles and theory of key elements of the entire amplifier. The second part consists of a complete description of the design and construction of a power amplifier, digital control with remote control, a spectrum analyzer, equalizer, preamp VU meters and complete power supply. Each proposal contains a detailed analysis of the solutions supported by simulations and software. For individual parts have been completely measured p arameters.
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Open source PBX YATE
Kovář, Jan ; Daněček, Vít (referee) ; Šilhavý, Pavel (advisor)
The work discusses about the PBX Yate, describes its configuration from the initial installation, through the basic setup and description of the way through the logs of user registration, the syntax for defining the calling plan, including examples, and additional services, including demonstration of practical verification of the functionality in the computer lab. Are also created two samples job for more familiar with the principles of operation and the Yate PBX settings.
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Visualization of connections between computers
Kovář, Jan ; Pelka, Tomáš (referee) ; Komosný, Dan (advisor)
Project Multicast IPTV Research Group mainly deals with the proposing of new mathematical models and communication protocols within IPTV technology. This technology is associated with VOD (Video on demand) and internet services such as web pages or VoIP (Voice over Internet Protocol). This bachelor thesis is focused on IPTV theory, history and achitecture. Analyse multicast, its attributes, routing and protocols used to broadcasting. Subtilize posibility of graphics formats for visualization, their advantages and disadvantages. Final objective of this project, which is solved on Multicast IPTV Research Group project, is application, which analyse input data generated by hierarchy summarization. By virtue of graphviz are generated output data in svg format. It is easy to view this svg files in later types of internet browsers.
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Alarm device with message transmission via cell phone
Letocha, René ; Kovář, Jan (referee) ; Kolka, Zdeněk (advisor)
The topic of my thesis is a kind of safety equipment that is capable of on the basis of evaluated subject to warn or inform a user preset via mobile phone. The system can not only warn users before nezvaným guest, and thus act as GSM alarm, but can also inform users when a fire or flooding the building with water. The whole system has been designed to cover the needs of the award of the project and also the needs of end users, who wished not only reliability, but also simple and friendly user interface.
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Design of system for indication of gas leakage by ultrasonic microphone
Bohuš, Michal ; Kovář, Jan (referee) ; Šotner, Roman (advisor)
The aim of this project is detection of gass leak based on the ultrasound sensing. Work introduces ultrasound, mechanism of its propagation and attenuation. From all of the available microphones, the piezoelectric microphone was chosen. Project continues with description of the device, which can be capable of detection of the ultrasound leakage in dangerous, explosive environment. This type of device must meet requirements of SIL 2 standard and ATEX directive for zone 2. Project discusses LNA (Low Noise Amplifier), filters and detection circuits design. The device is modular what means that each module can be freely replaced. The role of these modules is to convert analog signal to digital form suitable for microcontroller HERCULES TSM57012.
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Masonry house
Kovář, Jan ; Šafářová, Markéta (referee) ; Lavický, Miloš (advisor)
The aim of this bachelor thesis which is called „ A brick – built detached house“ is to create documentation for carrying out construction. The house is designed for a four – member family. It is situated in a suburb of Velké Němčice. The building has been designed as a detached house with two floors and no basement. The first floor consists of two parts – a technical and active one. In the technical part, there is a garage for a car, workroom, technical room, closet and staircase. In the active part, there is a living room with dining room, kitchen and entrance leading to the terrace. On the second floor, there is a closet, bathroom, drying room, separate toilet and three rooms. The load – bearing wall is made of brick breeze blocks Porotherm. The ceiling is made of POT girders and ceiling inserts Miako. Part of the house is covered with a single pitch roof with an agle of inclination of 15° made of a tin roof covering Lindab and the second part is made of a flat roof from a sloped wedge.
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Design of special antenna rotator
Půhoný, Jan ; Ježek, Michal (referee) ; Kovář, Jan (advisor)
This master's thesis deals with design electronics for an antenna rotator in two axis. There are designed and implemented drivers for two stepper motors. Was also designed and implemented control panel that allows manual control the rotator and remote control by PC via USB. At the same time created software for control panel and PC application for easy operation.
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Restoration of limestone in Grygov
Pilcová, Sabina ; Kovář, Jan (referee) ; Guzdek, Adam (advisor)
The subject of this bachelor thesis is a reconstruction of historical building of the limestone in Grygov. This project is based on the subject AG034 Studio of Architectural Design 4 - Restoration of Monuments. The main topic of the studio work was to come up with the new content and use of a building of limestone and at the same time tie up with the adjacent area of former site of limestone, and to create an architectural study. The project is focused on converting the building into a brewery, gallery and an observation tower, multifunctional spaces for hosting public and private events and use of the adjacent area for multifunctional sports ground, workout course and a space for outdoor music festivals. During the restoration of the main building the emphasis is on purification the building, removing its inappropriate parts and returning to its original looks. Creating harmony of its historical appearance with modern and modification for new use. At the same time, it is essential to preserve the essence of the place. New interventions in the building are handled with respect for the existing structure.
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