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Pseudo-differential frequency filters operating in current mode
Velič, Ladislav ; Bečková, Zuzana (referee) ; Sládok, Ondřej (advisor)
This bachelor thesis deals with pseudo-differential frequency filters working in current mode. This thesis further describes different types of frequency filters and their characteristics. In the thesis there are described differencies between differential, non-differential and pseudo-differential filters and their schemes. The thesis then shows schemes of pseudo-differential filters working in current mode. Pseudo-differential band-pass filter is in practical part of the thesis constructed and its practical features are compared to the theoretical.
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Deasign and development of programable notch filter for audio circuits
Dohnal, Jaroslav ; Prokop, Roman (referee) ; Háze, Jiří (advisor)
This thesis discusses harmonic distortion and its measurement in the audio bandwidth using notch and tracking notch filters. The first chapter defines harmonic distortion and ways how harmonic distortion can be measured. The second chapter describes different notch filter topologies and their realizations for use in an audio band. It also describes the tracking part of a tracking notch filter. The third chapter shows a design of a notch filter using the state-variable topology, board layout and a control module for this programmable notch filter. It also describes A/D converter with USB interface used for making measurements in chapter four.
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Measurement of Non-Linear Properties of Loudspeakers
Friml, Vilém ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
This thesis deals with calculation of THD dependency on signal frequency and calculation of Rub & buzz distortion using MATLAB software. Thesis includes generation of signals suited for THD measurement, playback and recording using sound card and APx series 500 device. The APx device controlling and data acquisition by MATLAB is also addressed. Loudspeaker electric model is discussed for the use of Rub & buzz measurement.
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Design of audio power amplifier with Bluetooth connectivity
Bartoň, Jan ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
This bachelor‘s thesis deals with the task of designing an audio amplifier, operating in class D, with a nominal output power of 2 x 80 W with Bluetooth connectivity, supplemented by an equalizer and a state display. A power supply and a user interface are designed as well. At first, research regarding audio amplifiers is made, followed by a more thorough description of class D operating principles. Afterwards the actual synthesis of the desired amplifier is presented, followed by the power supply design procedure. The correctness of the synthesis is later verified by simulations in PSpice and LTSpice. Theoretical design is then practically built, and its parameters are confronted with expected values by measurements.
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Design of Measuring and Recording System for 100 kV AC/DC Haefely KIT
Sirotsin, Aliaksandr ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
This bachelor thesis is devoted to the design of a measuring and recording system for a 100 kV construction KIT. It describes the Haefely KIT 100kV, reveals the analysis of the principle of the operation of the measuring instrument DMI 551 and the design of the measuring system. In addition to it this work presents the calculation of harmonic distortion, ripple, peak, mean and rms values from the measured data and their measurement. The practical part of the thesis is completed with verifying the individual functional parts of the measuring system, including calibration.
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Analysis, features and applications of available current mode multipliers
Miksl, Jan ; Jeřábek, Jan (referee) ; Šotner, Roman (advisor)
The diploma thesis deals with analysis, validation, measurement of parameters of the commercially available current multiplies (namely the EL2082 and EL4083) and their applications in practice. Control analysis are carried out in OrCAD PSpice program and compared with values from datasheets. Control analysis are focused on AC and DC characteristics of these active blocks. There are discusses the input impedance, the output impedance, the current gain and the possibility of electronic adjusting. The parameters of the elements were verified by measurements. Proposals for circuit applications (selective circuit, oscillator, frequency filter) with EL2082 and EL4083 are presented and analyzed in the program OrCAD. Three oscillator circuit designs are experimentally tested and the results are compared with the theoretical expectations and simulations in OrCAD. The possibility of electronic control for oscillators is examined. Also the sensitivity and the tolerance analysis are carried out. The constructional details of oscillators are presented at the end of this work.
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Smart socket for electrical parameters analysis with possibility of controlling connected appliances
Musil, Libor ; Krajsa, Ondřej (referee) ; Musil, Petr (advisor)
Thesis deals with the design of intelligent electrical socket. At the beginning of the thesis, there are described the characteristics of the distribution network in the Czech Republic and the ways of measuring these properties. The selected integrated circuit that realizes the measurement is described in detail. The third chapter deals with the current possibilities of power management, especially from the perspective of the distribution company and the concept of smart networks. The fourth chapter deals with the selection of communication interface suitable for smart socket as an element of smart home. The selected IEEE 802.15.4 standard and the microcontroller implementing the communication itself are described in more detail. The following part of the work is about design of the intelligent socket development board, on which the concept is tested and the design of the final hardware is described in this chapter. The last chapter describes the measurement results realized by the created device.
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Simulation and implementation of the audio power amplifier
Svadbík, Pavel ; Kratochvíl, Tomáš (referee) ; Šotner, Roman (advisor)
This work deals with simulation and analysis of audio power amplifiers of various concepts and classes. The theoretical part presents the basic necessary knowledge of electrical concepts and principles necessary for mastery of issues that this work deals. For each simulated circuit are described the basic operating principles and evaluated the results of the analysis. Based on the results of the analysis is chosen circuit, which is experimentally realized and measurement. In conclusion discusses the parameters obtained by simulations and practical measurements, and are fully assessed characteristics realized amplifier.
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Operation of a distribution system with resistance welders
Zelený, Miroslav ; Šlezingr, Jan (referee) ; Drápela, Jiří (advisor)
This Diploma thesis deals with assessment of the influence of two fundamental types of resistance welders operation on chosen power quality parameters at the point of common coupling (PCC) of the power network. The assessed parameters of power quality are the total harmonic distortion of the supply voltage, asymmetry of the supply voltage and the level of short term flicker at the point of common coupling. The assessment is based on the comparison of the results of computer simulations done in PSCad 4.2.0 with the requirements of technical standards. The outcome of this thesis is the determination of allowable limits for physical and operation parameters for the general arrangement of a power distribution network and a resistance welder that should guarantee the power quality compliance.
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Design of pseudo-differential frequency filters using conveyors
Hýl, František ; Langhammer, Lukáš (referee) ; Sládok, Ondřej (advisor)
This bachelor thesis deals with a second order pseudo-differential frequency filter operating in voltage mode. It also describes various types of frequency filters and their characteristics. It contains a summary of the differences between Pseudo-differential, fully differential and non-differential filters and their involvement. The pseudo-differential filter of the high-pass type is devoted to chapters of design, simulation and measurement.
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