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Electromagnetic interference and pacemakers
Kulík, Jindřich ; Richter, Miloslav (referee) ; Havlíková, Marie (advisor)
This thesis deals with electromagnetic compatibility of implantable electro-medical devices using in cardiology. The main aim of this thesis is detection of the resistance of implantable pacemakers (PM) and implantable cardioverter defibrillators (ICD) to the electromagnetic interference. In the first part of this thesis, a function of the heart, which is necessary for understanding of PM and ICD operation, is described. The function and construction of PM and ICD is detailed in the theoretical part as well. The next part is focused on the electromagnetic compatibility. The next part is description of the measurement method and the experimental arrangement used for practical experiments with electromagnetic resistance of PM and ICD.
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Laboratory Switching Power Supply
Šneidr, Radim ; Petržela, Jiří (referee) ; Šebesta, Jiří (advisor)
The topic of my bachelor´s thesis is a solution to a laboratory switching power supply, look at their benefits, disadvantages and characteristics in terms of EMI. The aim this work is also to design the concept of two outputs switching supply with monolithic circuit, LM2576 with the inclusion of a current limiter and implementation of a test version which will use basic measuring. Further, design a general scheme and the mechanical solution of a power supply including measuring modules. Design layout of printed circuit, complemented with thorough testing.
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Electromagnetic compatibility tests
Kolařík, Jan ; Hoder, Karel (referee) ; Havlíková, Marie (advisor)
The aim of this bachelor project is analysis problems branch of science EMC. The bachelor project contains basic distribution field and description individual parts of the field. Next bachelor project contains detailed description of individual measuring devices and equipment test room of EMC in company AEV s.r.o. like are signal generator, spectral analyzer and antennes. Last part of bachelor project deals with measurement electromagnetic interference on the product from the company AEV s.r.o. in accordance with the standard TL965 and design report of tests for a customer.
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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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Interconnects modelling for signals transmission
Fabián, Martin ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
In this work, there is solution for problem about signal itegrity and problems that causes raising frequence in circuits and machineries. There is describe interconnect analysis of models, which enable transfer of signals in mixed analog – digital circuits and a different between the analyse of an time domain and an s-domain. Next, there are described three methods of the calculation homogenous transmission line.The first method is constructed on mathematic description of transmission line. The second method uses cascade connection and T networks to the simulation model of the homogenous transmission line. The last one is constructed on the moment matching in use of state variables. These methods uses numerical inversion of Laplace transforms and these methods are constructed in programming language Matlab. Its results with the confrontation is described in the ending.
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Electromagnetic compatibilty
Šimoník, Martin ; Hoder, Karel (referee) ; Havlíková, Marie (advisor)
This bachelor is focused on a problem field of electronic compabiliti as the technical side as same as biological side of it. This Thesis describes the basic concepts of EMC and also analyzis each legislative requirements and regulations of EMC. One part of this thesis include designing a test procedur for verifcation of EMC pressure measurement technology of BD SENSORS company and realization of it.
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Design and implementation of TEM cell
Bednarský, Vojtěch ; Růžek, Václav (referee) ; Dřínovský, Jiří (advisor)
The purpose is to design and make a TEM cell, which may often be referred to in publications as a Crawford chamber, after the inventor. The operating frequency is specified from 100 kHz to 400 MHz and is suitable for a test device of maximum size (0,3(l) x 0,3(w) x 0,1(h)) meters. I will first describe the basic methods of electromagnetic susceptibility testing, and electromagnetic interference measurements, and then mention the issues and motivations for the fabrication of the closed TEM cell. Computer simulations were performed in the numerical computing software CST Microwave Studio. The calculated dimensions were used as a starting point for simulation. Dimensions from the simulation were used for the fabrication of the closed TEM cell, which showed similar results as the results of the simulations.
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Ultra low noise switching power supply
Raba, Jaroslav ; Leuchter,, Jan (referee) ; Šrámek, Petr (advisor)
This thesis deals with the issue of switching power supply in terms of noise ratios in the output voltage. In the theoretical part analyzes the basic principle of classical and resonant topology switching power converters in terms of output voltage ripple and switching noise. There are also some possibilities of compensation to minimize switching noise and output ripple. The second part describes the custom design a low noise switching power supply, which is composed of an active power factor corrector, power converters and ripple limiter. The main power converter is designed as an LLC resonant converter. The last part deals with the actual construction of the proposed source, its measurement and presentation of the results.
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Kazuistiky vystavení pacientů s CIED zdroji elektromagnetické interrference
Morava, Jan ; Richter, Aleš
Příspěvek se věnuje interakci rušivého elektromagnetického pole a srdečního implantabilního elektronického zařízení, kardiostimulátoru nebo kardioverter-defibrilátoru. Poukazujeme na široké diagnostické možnosti moderních implantátů. Chování stimulátoru v přítomnosti rušení analyzujeme na dvou kazuistikách intrakardiálního EKG z pamětí přístroje. Na dané epizodě popisujeme vliv rušení na stimulační funkci, diskutujeme mechanismus a detekci z pohledu stimulátoru. Diskutujeme individuální optimalizaci nastavení stimulátoru podle konkrétních epizod.
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Analýza elektromagnetického pole emitovaného při obloukovém svařování na funkci kardiostimulátoru
Souček, Tomáš ; Richter, Aleš ; Abdel-Haq, Mahdi
Pacienti s kardiostimulátory, nebo kardioverter-defibrilátory jsou vystavení určitému riziku ovlivnění tohoto zařízení okolními zdroji elektromagnetického pole. Jedním ze zdrojů potenciálně nebezpečného pole je oblouková svářečka. Cílem tohoto příspěvku je představit prováděný výzkum zaměřený na analýzu funkci kardiostimulátoru při sváření. V první části výzkumu je prováděno in-vitro měření se 7 kardiostimulátory, které jsou testovány při sváření metodou MIG. Pomocí programmeru jsou sledovány odezvy kardiostimulátorů, z nichž budou vyvozeny bezpečné podmínky pro sváření pacienty s kardiostimulátory. V příspěvku jsou popsány metody použité ve výzkumu.
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