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Inteligent battery charger controled by microcontroler
Burda, Petr ; Magát, Martin (referee) ; Pavlík, Michal (advisor)
Universal, smart battery charger NI-Cd, NI-MH, Li-Ion a Li-Pol batteries with adjustable voltage incremental rotary position sensor in the range of 0 -25 V and currnet up to 1 A load.The charger is controlled by microcontroller ATMEGA32 – 16PU Atmel and provides thermal protection and management of the chrging voltage depending on the temperature inside the battery pack or battery cells. Setting is made througth LCD screen to be displayed in addition to the set temperature, charging voltage and battery current. To save the profile is used EEPROM memory, which is contained in the microcontroller.
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Control of power LED, using ATtiny
Sedláček, Michal ; Pust, Radim (referee) ; Zeman, Václav (advisor)
The bachelor thesis deals with designing DC/DC steep-down converter, intended to supply power LED from a lithium-ion batteries. Work on the preface introduces the reader to the functions and the requirements for the proposed facility. Steep-down converter is controlled by a microcontroller suitably selected from ATtiny family. In this work are gradually dismantled partial circuit solutions, from which is then compiled a complete circuit. Is analyzed in detail the proposal steep-down power circuit converter. Work also includes the program for microcontroller and PCB design for the final circuit solution. In conclusion, this work is carried out measurements on the sample the proposed facility.
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Precise adjustable power suplly
Pawlas, Andrzej ; Magát, Martin (referee) ; Kadlec, Jaroslav (advisor)
This bachelor´s thesis deals with the proposing precise switching power supply. This switching power supply works with a maximum of 99 % duty cycle. Input voltage is 12 V and output can be set in the range of 1.2 V - 11.9 V. Current can be a source of burden 0 A - 20 A. The entire power supply is controlled by microcontroller. While addressing the proposal switching power supply have been developed five prototypes. Last prototype works well, but the output appeared significant interference.
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Design and implementation of revisions devices for the treatment of hyperhidrosis
Vejnar, Pavel ; Bradáč, Zdeněk (referee) ; Šedivá, Soňa (advisor)
Thesis deals with the design and realization of revisions devices for the treatment of hyperhidrosis. One of the methods how to treat hyperhidrosis is iontophoresis. This prevents sweating using an electric current. The work is divided on the parts. First part is a theory, which deals with basic principles of treatment. Next part is the analysis of original solutions and hardware design of new solutions. In conclusion I revive device by microcontroller programming and checking its functionality. I was able to create a prototype board, programmable firmware and successfully tested a prototype.
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Controled laboratory voltage suplier
Vít, Tomáš ; Valach, Soběslav (referee) ; Macho, Tomáš (advisor)
The aim of my master’s thesis is the design and implementation of laboratory power supply with output parameters 0-25V and 0-2A and options to manage this resource by elements of the front panel or via a computer control program. Content is the theoretical analysis of the possibility of subsequent theoretical sources suggesting that it verified on the prototype laboratory resources.
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General-purpose power supply with microcontroller
Jorda, Ivo ; Vyskočil, Pavel (referee) ; Brančík, Lubomír (advisor)
The aim of this thesis is design of adjustable switched mode power supply with symmetrical output of 25 V, and switched mode power supply with fixed output voltage of 5 V. Required maximum output current of each outputs is 3 A. At the beginning of the paper function of the basic SMPS topologies is described. Next all reqiured SMPSs are designed and chosen parts of the design are simulated. In the second half of the thesis assembly and testing of PCB are described as well as functions of programs. Last chapter contains results of meassurement of power supply paramters.
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Laboratory module for educational purposes
Tuhý, Luboš ; Vašíček, Adam (referee) ; Procházka, Petr (advisor)
This thesis describes the design and implementation of the transistor inverter to the subject of power electronics first outcome of this thesis will transistorized inverter that will serve as a demonstration tool in laboratory practice course electrical power. The laboratory preparation, students will be able to virtually test your theory acquired knowledge of the issue. Part of the theoretical analysis will be proposed circuit simulation program through classes Spice.
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Worpllace for dynamic testring of solar cells.
Hanák, Kamil ; Hégr, Ondřej (referee) ; Boušek, Jaroslav (advisor)
This work deals with method for characterization of photovoltaic solar cells based on evaluation of solar cell response to fast transients. The voltage of the cell in both forward and reverse polarisation was controlled by current pulse exciting. Real reverse breakdown voltage and exact value of serial resistance of the cell can be obtained easily by evaluation of the transient curves recorded by digital osciloscope. By negotiation of the time constants of the cell response to excitation in forward polarisation the lifetime of minority carriers in semiconductor bulk can be estimated.
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Passive PFC filters for SMPS
Matejov, Michal ; Červinka, Dalibor (referee) ; Drápela, Jiří (advisor)
This work deals with theory of switched power sources. There is description of the ways for connection and their practice purposes. In the next parts there are defined requirements on input supply circuit for these sources, especially for the form of output current. There are mentioned the basic connecting methods of PFC circuits and these methods modify the output current to meet the requirements of specification ČSN EN 61000- 3- 2. In the next parts there are shown simulations of PFC circuits made by Pspice application. Further is the basic description of sources construction for the sources which were used for testing and measuring. The final part deals with evaluation of the measuring on the chosen computer’s source. It compares between the manufacturer’s solutions and PFC circuit made by ourselves.
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