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EMC Test laboratory for low voltage circuit breaker
Vejtasa, Leoš ; Dřínovský, Jiří (referee) ; Dohnal, Petr (advisor)
Nowadays there are electronic systems almost in every new device. They are emitting and receiving electromagnetic interferences. The safety levels for circuit breakers are also increasing. Because of these issues the circuit breakers must work properly also in areas filled by electromagnetic interference. This thesis describes the issues of electromagnetic susceptibility of the circuit breakers.
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Electromagnetic field scanner and its utilization in EMC measurement
Chupáč, Michal ; Číž, Radim (referee) ; Kubánek, David (advisor)
Master’s thesis is focused on making the acquaintance of EMC issues and ways of electromagnetic field scanner RS321 utilization for pre-compliance measurements. First part contains analysis of available equipment’s influence on measurement results on the basis of gathered specification. Next part includes an example measurement used as operational manual for scanner and its controlling program. The most important part is correction evaluation for performed EMI measurement of signal generator using its EMC certification protocol and application of gained correction curve on independent EMI measurement of device tested by EMC testing laboratory. Other possibilities of scanner utilization are mentioned in the next chapters. Last part of the thesis contains suitability evaluation of EMC scanner on the basis of findings from performed measurements.
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Remote control of low voltage motor circuit - breaker
Brtnický, Jiří ; Musil, Vladislav (referee) ; ABB, Stanislav Korčián, (advisor)
The master´s thesis describes the design of the remote control, which is used as accessories for motor circuit-breaker. The work is based on the concept of control realized in the bachelor´s thesis. Master’s thesis contains a literature review of management method stepper motors with integrated circuits. standards relating to the control and switching low voltage devices were rehearsed. It was compiled schema of an entire unit after designing optimal control section of a stepper motor with integrated circuits, which consists of four parts (power supply, power section for driving an coils of stepper motor, control section and section for driving external devices). Design and realization of PCB are based on compiled schema, PCB was mounted with components and final PCB was recovered. The last part of thesis is about verification a functionality with using measurement of a prototype parameters.
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Virtual Measurement System for the Anechoic Chambers
Váško, Ondřej ; Soldán, Josef (referee) ; Dřínovský, Jiří (advisor)
Master thesis examines a selected part of electromagnetic compatibility. In this work, there is theoretically discussed how electromagnetic interference appears and how is spread through free space environment. To eliminate ambient interference signals, the measurements have been performed in anechoic chamber where the undesirable interference signals were suppressed. In the thesis, there are also described parameters of EMI receivers and limits of electromagnetic interference. The description of calculations of the antenna height for finding maximum intensity of electric field strength for standard measurement distance has been made. For proposed transformed measurement distance, calculations of intensity electric field with addition of parameters measuring antenna and object under test were performed. Correction curves for conversion intensity electric field have been obtained as the result.
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Methods of printed circuit board design
Cirkovský, Jaroslav ; Vrba, Kamil (referee) ; Herencsár, Norbert (advisor)
The main purpose of my bachelor thesis was to acquaint with issues of printed circuit boards and to create multimedia videos. The first part deals with questions of the accuracy, miniaturization and applied cases with different outlets. Following chapters dissert on electromagnetic compatibility from the view of basic rules, which have to be observed in order to reach the best functionality of the printed circuit board. There are also other issues - components increasing the reliability of printed circuit board and the comparing of methods of printed circuit board design. The final part of my bachelor thesis discusses outputs which are necessary in practice. This includes technical and design documentation and the technology of production the printed circuit. The last chapter describes created multimedia utilities which help us with printed circuit boards design via the program Eagle.
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EMD instruments and electromagnetic mmunity
Mikula, Dalibor ; Buchta,, zdeněk (referee) ; Havlíková, Marie (advisor)
The work deals with implantable devices and possibilities of interference of elektromagnetic field. At first, the electromagnetic compatibility is discussed. Basic terms are explained, followed by insisting on resources of possible distrurbing of implantable devices and standards dealing with this issue. Furthermore, short chapter about devices affecting function of implantable devices is introduced. It means devices which patients with implantable devices may meet in common life, as well as devices used in common life, also devices used jn medical environment. In the next part, measuring process of electromamagnetic effect in working compartment of FN Brno magnetotheraphy and elektrotheraphy is devised. There is a concept of measuring card thanks to which impulses of implantable devices are measured. Finally, a description of measuring on implantable devices in FN Brno. MIKULA, D. EMD instruments and electromagnetic immunity. Brno, 2009. 74 s. Master’s thesis in Brno University of technology on faculty of elektrical engeenerig and communication. Supervisor Ing. Marie Havlíková , Ph.D.
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Measurement of anechoic chambers
Švec, Marek ; Nováček, Zdeněk (referee) ; Dřínovský, Jiří (advisor)
This Master’s project deals with general aspects and possible solution of effective shielded cover and cell/chamber shielding measurement for needs of electromagnetic compatibility EMC on the basis of available norms and standards. Electromagnetic shielding is one of the most anticlutter means of EMC. Its main task is reduction of disturbing emission at the side of sources of disturbing signals as well as electromagnetic resistance increase at the side of disturbing signal receivers. Shielding is considered to be an important structural means to reduce electromagnetic field referring to a defined space part. Technical means for achieving the given goals are called shielded covers or shielded cells/chambers. Shielding is one of highly effective methods related to electromagnetic protection, for instance against power/output disturbance. To express the shielding quality so called shielding effectiveness SE is used. It represents logarithmic rate of shielding coefficient that is defined by the intensity ratios of electric and magnetic fields in a certain point of the shielded space to electric or magnetic field intensity incident/impinging on the shielded screen or wall.
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Design Rules for Electronic Systems with ATMEL Microprocessors from the EMC Point of View
Kaštan, Jiří ; Svačina, Jiří (referee) ; Urbanec, Tomáš (advisor)
This diploma thesis is dealing with the basic knowledge of the Electromagnetic compatibility. It’s concretely target on electromagnetic interference flowing from the application of electronic gas control by Honeywell company. Author compile the power control board with including software in language C. The next alternates of power control board with the separated microprocessor were designed for the more extended source detection. On these boards there were explored shielding surface features placed directly under the microprocessor. The application reducing the interference was designed in accordance to the rules finding out during this diploma thesis writing.
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Porovnání usměrňovače s šířkově pulzní modulací s usměrňovačem fázově řízeným
Lettl, Jiří
The presented paper deals with measured waveforms of realized PWM rectifier with practically sinusoidal input current and controllable phase shift between input current first harmonic and supply voltage first harmonic. Electromagnetic compatibility of PWM rectifier and classical phase controlled rectifier is compared on the basis of the input current harmonic analysis.
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