This diploma thesis deals with the calculation of the heat loss of a family house, possible ways of reducing the heat loss and impacts of replacing an existing heating source with a gas condensing boiler or heat pump. The research is focused on the individual ways of reducing the heat loss and possible choices of heating sources for the chosen subject. In the next part, there is the house described and its heat loss is calculated according to ČSN EN 12831. Subsequently, arrangements are proposed to reduce the heat loss and return on investment is calculated. The last part is focused on replacing the existing heating source by a gas con-densing boiler and heat pump. Regarding to low price of 1 GJ of heat, reducing heat loss without the subsidy program “Nová Zelená Úsporám”, would not be interesting. However, if we replace an existing source with a gas condensing boiler or heat pump, then the reduction is a must.

This thesis deals with a design, construciton and testing of a switch-mode power supply (SMPS) which is working as a LiFEPO4 battery charger with output current up to 100~A and output voltage up to 14,6~V. The output voltage and current can be regulated by the operator from zero to maximum value. For this SMPS Half-bridge asymmetrical forward converter with two transformers and common output inductor topology is chosen. The control circuits are run by the IC SG3525. Cascaded regulation of output voltage and current is implemented by two discrete operational amplifiers. Undervoltage protection of the control circuits and independent overcurrent protection on the primary side is also implemented.

Cílem této práce je navrhnout a sestavit napájecí zdroj pro notebooky různých výrobců pro použití v osobních a nákladních automobilech a na motocyklech s výstupním výkonem až 120W. Výsledný zdroj obsahuje USB-C konektor pro podporu napájení notebooků a chytrých zařízení s podporou Power Delivery, dále USB-A konektor s podporou Quick Charge 3.0 a také 12V automobilovou zásuvku pro možnost připojení dalšího automobilového příslušenství. Napájecí zdroj dále disponuje ochranou proti přepětí a přepólování vstupního napětí a také ochranou proti přetížení jednotlivých výstupů. Součástí zařízení je také LED displej, který uživateli umožňuje pomocí vstupního rozhraní jednoduše nastavit výstupní napětí pro notebook a sledovat aktuální hodnoty všech výstupů. Pro nastavování výstupu, indikaci a ochrany je použit mikrokontroler Arduino Nano.

This master’s thesis work deal with diagnosis parameters immunity curves uniphase appliance on short - term voltage dips a interuption. Immunity curve is dependence smallest possible sizes RMS voltage for performance given to criteria function on time continuation voltage event. Curves of resistance is different for each electric appliance, and depending on the size and over-voltage network, the burden on resources and voltage during the event.. The goal of this work is to devise a methodology for measuring the implementation of parametric measurement limit curves of resistance for selected types of appliances.

This thesis discusses modern methods for fast defect detection of solar cells. For the means of the defect classification, the technological production process of crystalline silicon solar cells is described. The defects are researched by the electroluminescence and prohtoluminescence methods. The Photoluminiscence method is improved by the posibility of using different wavelenght of excitacion sources. The range of using in industrial production is determined for the discussed methods.

This work deals with the design and realization of a modular security central unit's hardware positioned in familial houses. As an operating component of the central unit is used Module Rabbit 3365 with an integrated Ethernet interface. Based on user's requirements and general requirements for electronic security system, circuit diagrams of the central unit's motherboard and power supply with a function of backup power supply are designed. The work also includes layout of a keyboard and LCD display. Printed circuit boards are designed, produced and assembled. The device is set to work. The last part concerns programming of the module Rabbit 3365 in Dynamic C. Gradually, set of operating functions for individual components of the security central unit are implemented.

This master’s thesis is about design and realization of a digital controlled power supply. In the introduction there is defined a basic princip and division of the power supplies. Furthermore, there are considered two design realisations of digital controlled power supllies. The first one will be controlled by D/A converter and the second one will be controlled by digital potentiometers. Consequently, there is in the master’s thesis designed controlled part which controls output parameters of supply. The core of the controlled part is microcontroller ATmega16. Output parameters are displayed on LCD display and are set by 4x4 matrix keypad. In the last part there is designed connection between PC and microcontroller by the help of converter FT232BM. Subsequently, there is designed the rectifier with a filter and electronic switching of the fan. At the end of the thesis is resolved the placement of the various component parts to the component box.

The thesis addresses the conceptual design and implementation of the switched-mode power supply having the adjustable dc voltage output up to 25V and current output up to 15A. The half-bridge topology is used for this supply. Design features and quantities are simulated in PSpice and Micro-Cap simulation tools. The thesis covers the simulation results, assembly data and the results measured on the implemented functional sample.

In the first part of the thesis discusses the function of the laser design and construction of its class. Here is an explanation of coherence and other properties of laser radiation. Listed below are the possibilities of energy distribution in the laser beam. Described in particular Gaussian beam. The paper explains the phenomena of bending and Young's experiment. The paper examines the influence of atmospheric environment in the transmission of electromagnetic waves, defined as light. Particular attention is devoted to atmospheric turbulence. In the second part are first discussed the possibility of measuring atmospheric turbulence and coherence of laser beam parameters. The following is designed to measure workplace coherence width and coherence length in a turbulent environment. At these workplaces were measured. The results of these measurements are also listed in the job. The following comparison of results with theoretical values.

This thesis describes the reconstruction network 10 kV HV networks in a teaching hospital in the transition to a new 22 kV voltage level according to valid regulations. The paper describes the current state of technological equipment and its gradual replacement with new technology at 22 kV voltage level in each power units so as not to limit the operation of the hospital. For this purpose, the new backup system for rotating spare resources. The thesis deals with new input distribution, which will serve as a transfer point between the customer and distributor of electricity as well as advance the existing technological equipment.