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Microprocesor controlled charger
Husník, Ondřej ; Ježek, Michal (referee) ; Kovář, Jan (advisor)
This thesis deals with design of microprocessor controlled battery charger with support of NiCd, NiMH and Li-Ion cells. The project focus is aimed within circuits design at algorithm of charge detection implemented into microprocessor. User interface is formed by PC application which communicates with charger via USB. PC connection allows recording of charging characteristics behaviour. The result of thesis is completely designed and created battery charger including microprocessor and PC application source codes.
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Design of evaluation network for in-vehicle networking communication chips
Kupčík, Ondřej ; Kovář, Jan (referee) ; Kolka, Zdeněk (advisor)
Cílem této diplomové práce bylo navrhnout moduly určené k demonstraci a testování některých obvodů, používaných v automobilové technice. Jedná se o LIN transceiver NCV7420 a osmivýstupový výkonový budič AMIS-39101. Návrh spočíval ve vybrání a popisu parametrů vhodných podpůrných obvodů, vytvoření celkového schématu a navržení desky plošných spojů tohoto modulu s ohledem na kompaktní rozměry a předpokládané testy. Dalším krokem byla tvorba firmware řídicího mikrokontroléru (C8051F344), jež zajišťuje LIN komunikaci, řízení budiče a základní monitorovací funkce. Poslední část popisuje software pro hostitelský PC umožňující komfortní řízení sítě složené z těchto modulů. Pro úplnost byl tento projekt doplněn o přehled vlastností sběrnice LIN a metodiky testování LIN transceiveru z hlediska funkčních parametrů i některých EMC měření. V příloha obsahuje kompletní schéma modulu, výkresy desek plošných spojů, seznam řídicích příkazů a fotografie modulu.
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Java EE Organizer
Kovář, Jan ; Martinek, David (referee) ; Kočí, Radek (advisor)
This thesis analyses existing organizers and approaches associated with these applications. Next part of the work describes three tier architecture and its individual parts. It also described some of the basic technologies which are included in the Java EE platform, or which that are closely related to this platform. Last part of the work is dedicated to describing the implementation and design of Java EE Organizer. It is an application which target is administration of event, task and contact manager.
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Laboratory device involving the high selectivity filters
Tuhý, Luboš ; Kovář, Jan (referee) ; Petržela, Jiří (advisor)
This project deals with the frequency filters of high selectivity. The area frequency filtering is fairly comprehensive and theoretically demanding discipline. The aim of this work isn’t to describe in detail and to include knowledge of the frequency filters, but only to clarify the aforementioned issues. In particular, we focus practically on filters working on other physical principles, especially on the crystal structure of partition filters and ceramic filters. The circuit simulation programs through classes Spice will be one of the parts of the theoretical analysis. There will be presented various options for implementing these filters, and the test products used in the design. The laboratory exercises dealing with frequency filtering and measuring engineered product will be made and based on the theoretical findings of this work. The laboratory exercises will include the developing of the model protocol.
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Winery Building
Kovář, Jan ; Havířová, Zdeňka (referee) ; Lavický, Miloš (advisor)
The goal of the thesis and its theme “ Winery Object“ is to create the contract documents for realization of the building. Winery is drafted for processing the grapes. It is situated into steep land, in uptown of Pavlov. The building is designed as a detached object with three floors. The first floor is partially sunk into the ground. The building consists of two objects on the first floor and is connected into one joint area, where is space for aging the wine, bottling, storage area and shipping. The first part of the object includes administrative area, area for employees, grape press plant and cellarage. In the second object there is designed the room for degustation and in the loft area the room for drying the straw wine. Supporting brickwork is slated of cement bricks of sacrificial formwork, insulated and there is aired facade. Ceiling construction is made of cellular Spiroll panels. The entire object is roofed with queen post truss with burnt roof covering.
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Modern trends of production Al-based castings
Kovář, Jan ; Kaňa, Václav (referee) ; Krutiš, Vladimír (advisor)
This bachelor thesis is a recherche discussing new methods of the production al-alloy castings, which are mainly developed for the needs of automotive and airspace industry. The described methods are semi-solid casting and metal-matrix composites as the approaches of slurry production and squeeze casting and V-process as the approaches of casting. Further are described SLS, SLM and MJF methods of rapid prototyping and the structure of SLMed AlSi9Cu3 alloy is observed.
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Thunderstorms occurrence in the Czech Republic
Kovář, Jan ; Krška, Karel (referee) ; Jebáček, Ivo (advisor)
This bachelor thesis focuses on storm situations in the Czech Republic and their occurrence in the period 1961-2020. It analyses the conditions of occurrence and appearance of thunderstorms and describes the storm activity at Karlovy Vary, Prague-Ruzyně, Brno-Tuřany and Ostrava-Mošnov airports in the period between 2001-2020. Marginal mention is made of the phenomena accompanying the storm, conditions of its passage and methods of detection.
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Monitoring device for level crossings
Navrátil, Tomáš ; Kovář, Jan (referee) ; Kolka, Zdeněk (advisor)
Bachelor‘s thesis deals with a design of a safety appliance. The device will be used particularly at grade crossing. The record device allows monitoring of digital signals with the basic board and with microprocessor ATMEGA 128. Signals are patterned each second. The device is equipped with a USB interface, RS 485, ethernet and SD card. The capacity of SD card is designed for 40 days. The basic development board Ethernut, to which additional circuits were connected, was used for testing basic functions. Records are saved on a removable memory SD card in FAT 16 format. Old records are overwritten when the card is full. The project includes a description of communication with USB interface, a technical design of USB interface with photography of the hardware. Bachelor‘s thesis characterizes features of the SD card, communication and a description of the file system FAT 16. I also introduce a design of connecting SD card to the microprocessor within the SPI interface. All software was written in programming language C. There are described main functions of the code and their parameters.
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Annual assessment the water treatment plant Dolní Věstonice
Kovář, Jan ; Vachovec, Roman (referee) ; Hluštík, Petr (advisor)
The thesis deals with the annual assessment of trial operation of the wastewater treatment plant in Dolní Věstonice. Th e theoretical part focuses on ways wastewater services for municipalities sizes 2001 - 10 000 EO. The following are the most frequently observed indicators which are reported in the current legislation. The practical part is focused on describing the wastewater treatment plant and to assess its condition at the time of trial operation. Calculated parameters of volume and hydraulic loads are then compared with the original proposal in the project documentation. The values of substance loads are compared with current legislation on implementation of runoff. Below are caused failures and problems in the prior operation. A conclusion is determined by energy class watched cleaners in terms of energy consumption.
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Methods for Analysis of Switched Circuits
Kovář, Jan ; Ondráček, Oldřich (referee) ; Kalous, Jaroslav (referee) ; Kolka, Zdeněk (advisor)
The dissertation deals with simulations of the DC-DC converters in their basic configurations (Buck, Boost, Buck-boost, Cuk, SEPIC). In the first part of the thesis derivation of transfer functions Line-to-Output (LTO) and Control-To-Output (CTO) can be found. These symbolic responses are derived for three types of basic converters (Buck, Boost, Buck-boost) using well-known average model [1]. Derived expressions are very complicated. For reduction of these expressions symbolic approximation method was used, however the generality is lost. The average model was used to for decreasing the computational effort of analysis of DC-DC converters in the time domain. For these simulations VHDL-AMS language was used. The main topic of the thesis is harmonic balance method, which was adapted to DC-DC converters. Because conditions and assumptions for LTO and CTO functions are very different, harmonic balance method was derived into two variants. For obtaining of LTO response, duty cycle of switching signal can be considered as constant in time. Spectrum of this signal is simple as follows from well-known sinc function. For obtaining of CTO response PWM modulation must be used. Compared to sinc function spectrum of PWM modulation is richer (contains more combination frequencies). Many types of PWM modulation is described in [31]. For simulation PWM modulation with uniform sampling in two variants (single and double edge) was used. Non-ideal switching of PWM switch was modeled by PWM pulse with defined slew rate. Last section deals with comparison of all derived functions (LTO, CTO, modulation type, defined slew rate) with well-known averaged model.
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