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Switching supply source 5,5kV/4,3kW with silicon-carbide semiconductors
Gabriel, Petr ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This thesis is about to introduce the development of switched power supply with output voltage of 5,5 kV and power of 4,3 kW. This thesis directly follows the outputs of two previous semester projects. Main task is about to finish the development of remaining printed circuit boards and perform launching of all parts of developed power supply. Next necessary task is about to assemble a functional prototype of the supply using the developed parts, performing a series of measurement supply’s parameters and creating of technical documentation of mechanical part. There are all stages of supply’s development included in this thesis. From the first part, that describes various types of converters, through the design of all the supply’s parts, to final implementation of functional prototype. There are the results of measurement supply’s parameters at the end of this thesis.
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Three Phase Line Active Rectifier
Miko, Radoslav ; Patočka, Miroslav (referee) ; Červinka, Dalibor (advisor)
Diploma thesis deals with problems of power factor correction and total harmonic distortion of line current in three phase industrial power supplies. It focuses mainly on using of single phase active PFC topologies based on the principle of step up converter, which are applicable to three phase systems. Verification of operation and comparison of parameters of several circuits was done by simulation in program Matlab Simulink. Then for selected circuit of active PFC was done complete design. The result is a prototype of single phase active PFC circuit with an output power 2 kW for input voltage range from 180 to 528 V (47 – 63 Hz) and a prototype of three phase active PFC circuit with an output power 6 kW for input voltage range from 3 x 180 to 3 x 528 V (47 – 63 Hz).
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Back-up power supply 230V/50Hz/300VA with a battery supply 12V
Snítilý, David ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
The aim of this project is to describe, design and create a converter from 12V DC to 230 VRMS. The power of this device is about 500W. The device consists of two main converters. The first one is step-up DC/DC converter and the other is DC/AC inverter. Step-up converter is designed as a resonant converter. It is useful for pushing down losses in semiconductors and inceasing efficiency. The inverter is changing DC voltage from the first converter to AC voltage. Control of this device is realized with DSP Motorola. This device should be used mainly for supply common devices up to 500W. Main usage is planed in a car or to another place where is not posible to connect some device to plug.
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Traction Drives with Asynchronous Motors
Běloušek, Josef ; Skala, Bohumil (referee) ; Richter, Aleš (referee) ; Patočka, Miroslav (advisor)
The first part of this work is devoted to the design of a traction asynchronous motor. The second part focuses on the developed method of the equivalent circuit parameters identification of the asynchronous motor in the form of -network. It is explained here that the equivalent circuit in the shape of a -network, alternatively of an inverse 'I-network, is exactly equivalent and fully-fledged to a T-network, although one of two stray inductances is formally missing. Furthermore, the relationships for the conversions of the T-network parameters to the -network parameters and back, and of the T-network to the inverse 'I-network and back are found. The third part deals with the calculation of the torque and the current characteristics of the asynchronous motor. A sensitive analysis of the torque characteristic is carried out on the individual parameters of the equivalent circuit of the asynchronous motor in the form of a -network and a method of the measurement by means of a flywheel is used for the torque characteristic measurement of the asynchronous motor. The fourth part focuses on the verification of the identified -network parameters in the Matlab-model of the traction drive.
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Laboratory power supply source with a digital control unit
Šír, Michal ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This project deals with a design of power and control circuits for a laboratory power supply source, consisting of a continuous conduction mode active rectifier and DC/DC converter. Detailed design of input rectifier with active power factor correction, DC/DC converter and control circuits with their implementation to digital signal processor are the project results.
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Modification of the intersection of Palackého and Krátká streets in Holešov
Dlhopolček, Michal ; Patočka, Miroslav (referee) ; Smělý, Martin (advisor)
The subject of this bachelor study is to design renovation of a T intersection of roads II/432 and II/438 in city Holešov. The intersection is on the west side of the city Holešov, which is located twenty kilometers north from regional city Zlín. Solution of the intersection are not convenient, especially for trucks connecting from street Krátká to center of city Holešov. Which creates traffic jams long around 175 m and reach near rail crossing, thereby creating an additional traffic risk. From three variations, was choosen one that fulfils all requests, like smoother conection to intersection, safety ride in roundabout. Increasing the capacity and ensuring sufficient quality of the intersection from the side way and even the main roads.
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Algorithms for the Control of the Induction Motor
Hundák, Vladimír ; Běloušek, Radim (referee) ; Patočka, Miroslav (advisor)
Hlavným cieľom tejto práce je vytvorenie simulácií rôznych algoritmov riadenia asynchrónneho motora a vzájomné porovnanie ich vlastností. Zaoberá sa taktiež možnosťami konfigurácie náhradného zapojenia na T-článok, -článok a -článok. Obsahuje jednak teoretický rozbor, a taktiež aj simulácie jednotlivých spôsobov riadenia spolu s podrobným návodom na ich realizáciu. Celkovo budú vykonané 3 simulácie – simulácia vektorového riadenia s orientáciou na rotorový tok, vektorového riadenia s orientáciou na statorový tok a simulácia takzvaného prirodzeného riadenia. Ide o úplne nový typ riadenia, ktorého autorom je vedúci tejto diplomovej práce. Jeho simulácia bola vôbec prvým pokusom o funkčnú realizáciu tohto typu riadenia.
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Mathematical models of the transformers and asynchronous machines
Cipín, Radoslav ; Běloušek, Josef (referee) ; Patočka, Miroslav (advisor)
The fist part of this work is dealt with the construction of the mathematical models of voltage and current transformers. There are created and simulated models of voltage and current transformer with the nonlinear magnetization characteristics. The second part of this work is dealt with equivalent circuit of the induction motor in the form of Gamma-circuit. The speed-torque characteristic and the dependence of stator current on the slip are calculated from this equivalent circuit. The third part of this work is dealt with electromagnetic design of the alternating current machines by the help of a classic way and a new way.
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Power Switching Transistors
Mikláš, Ján ; Procházka, Petr (referee) ; Patočka, Miroslav (advisor)
In this thesis, prerequisities for a switching loss measurements are established as well as designing of DC-bus and the base/gate driver for the power transistors; followed by derivation of mathematical approximation of transistor conductivity gCE =iCuCE, circuit simulation using gCE as a transistor model and a discussion of measured waveforms.
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Revitalization of the Padělky housing estate in Ždánice
Culek, Lukáš ; Patočka, Miroslav (referee) ; Smělý, Martin (advisor)
The main point of this diploma thesis is revitalization of housing estate called Padělky in Ždánice. The housing estate is located in the northwestern part of the village. There are nine roads in zone 30. Two of them were already repaired in the first stage. The housing estate is without a transport solution and without the possibility of legal parking. Now the roads are devastated, there are potholes, holes and cracks. Six roads were reconstructed, two were extended. This brought the possibility of detours and improved transport. The new design legalizes the parking space. There are new built parking spaces, too. Conditions for the inhabitants of the housing estate are improving. There are new trees, bushes, rosary, furniture and waste bins. The public lighting will be replaced.
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