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Converter for supplying of the power LED diode
Puczok, Václav ; Huták, Petr (referee) ; Patočka, Miroslav (advisor)
The aim of this thesis is to design a grid-powered supply for supplying power LED used in illuminating application. The power supply consists of an input line filter which attenuates conducted high frequency signals (EMI filter), an active rectifier (PFC circuit) to improve the power factor and the main constant output current double-sided forward converter. It thoroughly focuses at design of the converter's power stage, mainly at pulse transformer, switching transistors, output rectifier and output filter. Main converter model was created in the Matlab-Simulink environment in order to simulate behaviour of the current loop. Final product of this work is a fully functional power supply and the main converter's model.
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Matlab models of DC/DC converters with transformer
Michalík, Martin ; Knobloch, Jan (referee) ; Pazdera, Ivo (advisor)
The aim of the Bachelor thesis was getting in touch with standard topologies of DC/DC converters with transformer, their realization in programming environment Matlab/Simulink with usage of Simscape library and processing the results of simulations. Part of work is given to theory of transformers and design of transformers model, which is important part of every DC/DC converter with transformer. Model of transformer is based on theoretical background and functionality is checked up by reference model. The main part is aimed to enlighten functionality of different variety of DC/DC converters with transformer, creating their models in programming environment Matlab/Simulink, simulate those models and process results of simulations.
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Charger for a battery supply of an oscilloscope
Novák, Miroslav ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
This bachelor thesis deals with the design and construction of a battery charger for an oscilloscope battery source. The output parameters of this charger are: output voltage 4.1 V and output current 15 A. The charger is designed as a flyback converter controlled by the integrated circuit UC3844. First, the possible topologies of the inverter are described. Then the selected flyback converter and the subsequent design of the power parts and the control circuit are described. Then the measurement where the transformer leakage was too large is described. Therefore, the following section describes the modification of the charger design, which uses a snubber network to eliminate the effect of leakage. This is followed by a description of the mechanical design of the charger. Finally, measurements of the charger are documented, testing problems are described, and the results obtained are evaluated.
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Electronic ballast for power LEDs
Vágner, Richard ; Martiš, Jan (referee) ; Červinka, Dalibor (advisor)
This diploma thesis deals with design of power LED driver. This driver contains electronic ballast circuits, converters, filters and control circuits. Overviews of circuits used in practice are listed along with analysis of power LED and considering options for selecting an appropriate design solution. Thesis describe principle of electroluminescense, creating of the device, its structure and problematics of current source supply. Including detailed overview of converters, ballasts and topologies used in lighting systems with the selection of a suitable solution for the final device with an output power of 50 W. The thesis contains cooling dimensioning for selected power LEDs, input circuit with EMI filter, bridge rectifier, boost converter and flyback converter with pulse transformer.
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Instrument power supply unit
Navrátil, Petr ; Vorel, Pavel (referee) ; Tománek, Radek (advisor)
The semestral thesis deals with theoretical preparation for the following diploma thesis. The content of this semestral thesis is familiarization with STM32 microcontrollers, especially with timer blocks, A/D converters and I2C interfaces. The work continues to deal with a theoretical introduction to the selected switching power supply unit and the theoretical design of power supplies for the power supply unit. Subsequently, printed circuit boards were designed for each power source. The final step involves measuring the efficiency of each power source.
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Electronic ballast for power LEDs
Vágner, Richard ; Martiš, Jan (referee) ; Červinka, Dalibor (advisor)
This diploma thesis deals with design of power LED driver. This driver contains electronic ballast circuits, converters, filters and control circuits. Overviews of circuits used in practice are listed along with analysis of power LED and considering options for selecting an appropriate design solution. Principles of creating the device, structure and problems of current source are described in thesis. Including detailed overview of converters, ballasts and topologies used in lighting systems with the selection of a suitable solution for the final device with an output power of 50 W. The thesis includes cooling dimensioning for selected power LEDs, input circuit with EMI filter, bridge rectifier, boost converter and flyback converter with pulse transformer.
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Models of DC transistor converters in Simulink program
Loup, Martin ; Pazdera, Ivo (referee) ; Huták, Petr (advisor)
The master’s thesis is focused on the creation of models of DC/DC converters and control program for input parameters and their configuration. The first part is theoretical and she is dedicated to the description of the program Matlab. The second chapter is dedicated to DC/DC converters. Their function is described there and the necessary equations for the design are derived. All of this is complemented by the calculation of line losses in semiconductor elements and the design of voltage and current regulator. The last two parts deal with the description of the created models in Simulink and control program in a graphical environment. The created program is able to edit and recalculate parameters of the converters, calculate line losses on semiconductor components, perform a model simulation or open it.
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Battery-powered welding inverter
Starec, Stanislav ; Folprecht, Martin (referee) ; Vorel, Pavel (advisor)
This master thesis is focused on proposition and following implementation of DC arc welder. This paper is based on semester’s paper, where the first version was realized. The welder is powered by a battery pack with LiFePO4 type cells. Battery cells are protected by BMS circuits. The driving electronics controls the duty cycle step-down (buck) converter in a closed current or power regulation loop. The power regulator has been designed and validated by simulations. Switching power transistors, low side and high side, are implemented by optically isolated gate drivers. Charging the battery is solved by a switching flyback converter. For the charger and the welder is sheet metal construction made of aluminum sheet.
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