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High Voltage Pulse Generator for Electroporation of Cells
Puczok, Václav ; Martiš, Jan (referee) ; Červinka, Dalibor (advisor)
The main goal of this thesis is to design control board for the experimental electroporation device and to develop control firmware. The first chapter of this work focuses on the electroporation phenomenon itself. Behaviour of the cell model in external electrical field is described there as well as simulation and overview of how electroporation affects living tissue. It also explains the main requirements for parameters of the electroporation pulses as well as need for ECG synchronization. Furthermore, some remarks are given about novel high frequency electroporation method, which involves use of nanosecond bipolar high voltage pulse bursts. The second chapter briefly introduces commercial electroporation device called Nanoknife, including control part, power part, and it's limits. The third chapter consists of introduction of the novel experimental electroporation device developed at BUT. Power part of this device is discussed as well. Next chapter focuses on design of the control board for this device and also on description of the particular schematic parts. There is a control algorithm explanation in the fifth chapter of this thesis followed by the brief manual to machine operation.
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Step-Up converter for mobile device
Gabriel, Petr ; Červinka, Dalibor (referee) ; Huták, Petr (advisor)
The purpose of this bachelor‘s thesis is about to intoduce possibilities of construction and use of switched power supplies. Thesis focuses mainly to description of different types of converters. There are possibilities of power supplie's design and sizing of its components described in this thesis. This thesis contains concrete design of power supply for realization. There are results of the measurement and comparision to the parameters given by manufacturer set forth at the end of this thesis.
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Complete design of three-way speakers
Jalový, Michal ; Petržela, Jiří (referee) ; Slezák, Josef (advisor)
This project describes complete design of Three-way speakers. The introduction discussed the basic theoretical knowledge to the understanding of loudspeaker system design issues with regard to the physiology of hearing, the theory of acoustics, speaker characteristics, types of enclosures and the use of switches. Furthermore, based on the formula calculated parameters of a loudspeaker cabinet and speaker points to the loudspeaker of the proposed speakers.The proposal also relies on the specific measurement properties of the selected speaker impedance. Finally all data are presented for practical implementation speakers.
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Low-Voltage Traction Drive with a Fuel-Cell
Hejkrlík, Jan ; Singule, Vladislav (referee) ; Richter, Aleš (referee) ; Vorel, Pavel (advisor)
The main aim of this work is a development of electric car. This car has fuel cells as a primary source of electrical energy which will be performed with regard to the maximum roll-out and to maximize the efficiency of hydrogen conversion into electricity. The first part is dedicated to the concept of drive as a whole, the second part is dedicated to solving vehicle dynamics. The third part describes the design of mathematical models of drive components. Part four gives the results of simulations of traffic on the route at different ways of managing fuel cells and various vehicle speeds.
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Automatized working place for measuring of airflow parameters
Smělý, Jakub ; Vejlupek, Josef (referee) ; Vlach, Radek (advisor)
This thesis describes the design work for the measurement of air values. The first part describes the airflow, pressure build-up in pipes and losses due to airflow losses. There is also a description of fans and explain their characteristics depending on the pressure generated by airflow. The next part describes the design of the measuring chamber, electronics and control for fully automatic measurement of air quantities.
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Step-up convertor with transformer
Poštolka, Martin ; Procházka, Petr (referee) ; Hejkrlík, Jan (advisor)
This work focuses on the proposal and realization of high-frequency switching source. It consists of a theoretical and a practical part. The theoretical part includes selection and summary of the parameters of converters which we use. It also includes schemes and visual display of the important continuance of magnitudes. We can also find there the enumeration of advantages and disadvantages of every single converter. Further, it is concerned with the selection of the converter which is most suitable for our work. The practical part consists of the calculation and the solution of the step-up converter with the transformer. The realization and appropriate choice of components follows. There is also described the power supply of the switching transistors and how to operate these device.
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Switch-Mode Power Suplies for Electronic Circuits
Hantl, Josef ; Steinbauer, Miloslav (referee) ; Murina, Milan (advisor)
This bachelor’s thesis deals problems with Switching Power supplies and their comparison with classical power supplies. In this project, functions of basic kinds of convertors for Switchmode supplies and their characteristics, are explained. It adverts to possibilities improving of effectivity of power supplies by using resonant and quasiresonant convertors in switching supplies. The thesis designs a circuit conception, detailed perimeter design of Switchmode supply and contains simulation this circuitry. One part of this project are details for realisation power supply (drawing printed circuit, list of used materials).
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Voltage convertors for microprocessor devices
Kus, Václav ; Kolouch, Jaromír (referee) ; Michálek, Václav (advisor)
The task of this semester work is carried out summary converters DC / DC power supply suitable for small microprocessor devices with LCD display. As the input source voltage is 9V battery or two batteries (3V). The market has recently appeared a lot of manufacturers of these drives but more detailed information often not available. This work I wanted to help in selecting the correct convertor for your microprocessor equipment. The aim is not to describe all DC / DC converters. Another point of this work is the proposal of two DC / DC converters powered from 9V battery, and two converters fed from two batteries 1.5V. These converters are measured throughout the operating range of output values. This work also contains the documentation for the construction and use.
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Resonant and quasi-resonant converters
Krška, Vlastimil ; Sedláček, Jiří (referee) ; Murina, Milan (advisor)
Project is engaged in concept and realization of quasi – resonant converter with switching in minimum voltage which derive benefit from resonance capacitor and inductor. It is one of the possibilities how to increase efficiency of switch – mode power supply. While using resonant converters the losses are reduced, when the resonant inductor will connect and disconnect at zero current in inductor, or at zero voltage on inductor. Base of the power supply is chip NCP1337. Concept comes from detailed analysis functions of integrated curcuit and others curcuits of switch – mode power supply. Project includes a complete concept of all partial curcuits, description of a construction and the main parameters measured on the realized sample.
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Ultrasonic eraser of tartar
Novotný, Jan ; Dlouhý, Jiří (referee) ; Rozman, Jiří (advisor)
The aim of this thesis is to provide insight into certain elementary methods of removing tooth stone. Also, the thesis aims to introduce different techniques of removing tooth stone. The first part of the work analyses the theory of rise tooth stone, his create and biologically effect. Further, the elementary methods of removing tooth stone by ultrasound are introduced. In the second part, the thesis analyses the concept of instrument to removing tooth stone by ultrasound. The aim of this thesis is for working frequency 27 kHz propose circuit diagram of exciter generator. For intensity ultrasound 6W/cm2 count parameters sandwich converter and waveguide.
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