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Operating Characteristics of LED Sources
Brdečko, Aleš ; Diviš, Daniel (referee) ; Baxant, Petr (advisor)
This semester thesis is dealing with issues of LED (light emiting diod).In the text we can find general summary knowledges about LED, relating their history, construction, principle of working and also treatise about of semiconductor compounds. In thesis are given examples of use indicating their advantages and disadvantages and indicating their parameters. The practical content of this thesis is evaluation of measurement performed on some samples of LED especially graphics addiction of crosses and V-A characteristics measured in addiction on current.
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Driver of high brightness white LED
Tomášek, Petr ; Kubíček, Michal (referee) ; Frýza, Tomáš (advisor)
This document is analysing LED driving with switch power supply from electric distribution network 230V/50Hz. In the first chapter you can find short thesis about electric power supplies. Second chapter contains info about power supplies and their safety and EMC requirements. In the third chapter is analysis of LED. Chapter IV. is dedicated to LED power supply circuit desing and the last chapter is about construction and measuring of parametres of designed power supply.
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Static and dynamic properties of current sources
Čech, Vojtěch ; Boušek, Jaroslav (referee) ; Horák, Michal (advisor)
The goal of this thesis is to describe the main attributes of current sources and their use as current mirrors. It is focused on the most common variations, and is specially targeted the principles and features of the Wilson-current-mirror, which is composed of bipolar and unipolar transistors. The goal is to compare them, on the basis of the analysis.
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Electronic circuits with active elements at current mode
Bačkovský, Pavel ; Sedláček, Jiří (referee) ; Murina, Milan (advisor)
This bachelor’s thesis deals problems with current feedback amplifiers and their comparison with voltage feedback amplifiers. Then it adverts to mutual differences and compares their parameters. This thesis shows basic circuits with current sources and with power boost of this circuits. This thesis designs conception of current source. Simulation, complete details for realization of current source, drawing printed circuit and specification card used parts are part of this work. In the end this work the parameters of current source are checked.
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Two-quadrant switching current source for inductive loads
Húsek, Jan ; Chmelař, Milan (referee) ; Hanák, Pavel (advisor)
This master`s thesis deals with design and realization of two-quadrant switching current source for inductive loads. Output current adjustable range is 0 – 1A. Selected topology enables change of current direction. Current supply is made with TDA8920 integrated circuit. Thesis also contains basic information about switching supplies and coils.
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Controlled power generator of current impulses
Gabriel, Viktor ; Vrba, Kamil (referee) ; Rampl, Ivan (advisor)
The goal of this thesis is to design and realise microprocessor-controlled generator of current impulses, which are being brought in induction load. Thesis contains description of individual functional generator parts, mainly microprocessor program equipment. The text also aims for inductor design as an induction load and other solutions of power parts with the selection of the most suitable one. The generator of current impulses itself is realised on two-sided printed circuit board.
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Utilization of light emitting diode lighting
Podola, David ; Černý, Michal (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with problems of illumination by LED diodes. Basic concepts of lighting technology are defined in the first part. The second part is dealing with the construction of body LED diodes and explains the principle of white light formation to LED. Introduces problems of cooling. Gives an overview of the available power sources for LEDs. Provides an overview of how to control lighting by using motion sensors and presence sensors. Will be made basic economic balance sheet, which will evaluate the advantages of using LED sources. Attachments provide the LED catalogs of manufacturers, accessories for LED and comment on other sources of information.
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