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Ultrasound blood flow detector
Vožda, Michal ; Dlouhý, Jiří (referee) ; Rozman, Jiří (advisor)
This work deals with Doppler methods of measuring blood flow in blood vessels and a simple design with a continuous wave for the 4 MHz frequency and intensity of ultrasound 100 mW/cm2. The work contains a description of the functional blocks and design of their involvement. Individual blocks are simulated in PSpice. The resulting circuit is a printed circuit board and a 3D model of the plate fitted in EAGLE.
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PCB Layout on the OrCAD 16 Platform
Horčička, Martin ; Šimek, Václav (referee) ; Schwarz, Josef (advisor)
This bachelor's thesis concentrates on layout of printed wiring boards in OrCAD 16 environment, chiefly on specification of appropriate process methodology dutiny its proposal. A set of sample tasks that helps to explain and demonstrate the process at creation of separate phases is a part of this work. Among these phases belong electronical scheme designs,interconnection and subsequent simulation.
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Stray losses in magnetic material in the end of stator packet
Kopecký, Ivo ; Skalka, Miroslav (referee) ; Ondrůšek, Čestmír (advisor)
This thesis examines the magnetic field and magnetic flow at the end of the stator synchronous machine. This problem is solid using nonlinear magnetic resistive network, which is simulating by PSpice software. A simple model of stator, consisting of stator plates, air gaps and the two-thumbs, which hold the stator together. All of this is replace magnetic nonlinear resistive network, which is then divided into elements. According to these element is a simplified model solid and analyzed.
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Model of synchronous PM machine based on equivalent reluctance network
Sporni, Peter ; Lapčík, Josef (referee) ; Ondrůšek, Čestmír (advisor)
Táto práca pojednáva o problematike vytvárania a simulácie reluktančnej sieti synchrónneho stroja s V tvarovanými permanentnými magnetmi v programe PSpice. Na začiatku sa oboznámime s konštrukciou a parametrami stroja a potom vyvodíme základné rovnice na výpočet každého prvku siete. Vypočítame každý prvok tohto stroja a potom vytvoríme túto sieť v PSpice. Na začiatku je simulovaná sieť statická a všetky magnetické odpory sú lineárne. Neskôr nahradíme lineárne odpory reprezentujúce plechy nelineárnymi a počítame s precovnou teplotou permanentných magnetov. Potom porovnáme naše výsledky s FEM metódou počítanými hodnotami a vypočítame indukované napätie v jednej cievke stroja. Na záver vypočítame výkonovú a momentovú charakteristiku stroja.
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Memristor with PWL-type characteristic
Holas, Jiří ; Hájek, Karel (referee) ; Biolek, Dalibor (advisor)
Bachelor’s thesis deals with an analog emulation of memristor memory with PWL-type characteristic which is designed for modern digital memories. The first part of the document summarizes the basic memristor characteristics and rules of their proper modeling. The next parts present the circuit implementation and computer simulation. The printed circuit board design and prototype measurement are included.
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Magnetic field calculating of transformer by using conducting model
Bláha, Martin ; Skalka, Miroslav (referee) ; Kurfűrst, Jiří (advisor)
The paper deals with conductivE-resistive network. Use of this network is modeled transformer. The model is implemented in simulation program PSPICE and Simscape. To evaluace the results were used the values obtained using the finite element method. A simple model of the transformer has been replaced by rezistor network conductivity, which is divided into elements. According to these elements is a simplified model designed and analyzed
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Optimization of the active load of the source with dynamic output parameters
Halama, Petr ; Steinbauer, Miloslav (referee) ; Jirků, Tomáš (advisor)
This bachelor’s thesis deals with Power Factor Correction circuit, meant for the adjustment of the non-linear power source. Usually the PFC is designed for the power levels in the range of tens of Watts and more. New circuit will work at the power levels of maximally 1 W. Such control algorithm was designed, that the circuit represents the constant real load for an energy source. In the beginning of the work the Step-up converter topology was chosen as the best for next solution. More active PFC types were reviewed with the help of PSPICE simulator. In the next part of this project two of the analyzed circuits were implemented. Basic PFC for the demonstration of its principle and the half-bridge topology, which was selected on the basis of the analysis results.
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Device for audio signal processing by means of signal processor
Lev, Lukáš ; Rumánek,, Jaroslav (referee) ; Brančík, Lubomír (advisor)
Master´s work discusses the issue of processing audio signal by means of signal processor. At present, the signal processor occurs in almost all devices that process or somehow modify sound in digital form. The aim of this master´s thesis is to study the signal processors from different producers, which are now on the market and select one suitable type for device that will process the audio signal. With this signal processor then propose a circuit diagram for a device that will process the audio signal and the PSpice simulation of the circuit and construct this device.
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Mini-whip antenna
Pařízek, Tomáš ; Lukeš, Zbyněk (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the impedance matching of electrically very short antennas to the real resistance 50 . The antenna is considered as an input of an emitter follower, which plays the role of the impedance transformer. This follower transforms a large complex input impedance, which is typical for electrically short antennas, to a real output resistance. The output impedance was matched by appropriate matching circuitry to 50 in the frequency band of operation.
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The Design of current power amplifier for inductive load
Nimrichter, Filip ; Steinbauer, Miloslav (referee) ; Roubal, Zdeněk (advisor)
This batchelor thesis deals with Howland current source that should work with purely inductive loads up to 10 kHz. This current source will excite a coil with a nonlinear magnetic core, so it should deliver a current of at least 4 A. The main focus of the thesis is on the stabilization, practicle design and measurement of real properties of the Howland current source. This stability has been verified in PSpice and Micro-Cap. The practical design was compiled in the program EAGLE.
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