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Design of Effective Usage of Instructional System
Liška, Jiří ; Endrle, Pavel (referee) ; Škorpil, Vladislav (advisor)
In this bachelor thesis are proposed three new laboratory exercises using TIMS system. Laboratory exercises are focused on digital modulation, multiplexing and measurement errors in transmitting signals with line codes. The laboratory experiments were designed with respect to the practice of the subject matter in an article Access and Transport Networks.
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Signal generator for analog measurement approach
Gottwald, Petr ; Bohrn, Marek (referee) ; Fujcik, Lukáš (advisor)
The purpose of this bachelor thesis is the design of Xilinx XC3S200A FPGA-based, digital function generator for generating of sine waves, triangular waves and rectangular waves for evaluation of analog circuit characteristics. In the theoretical section of the thesis, basics of spectral analysis, digital-to-analog conversion and three most often used methods for digital signal synthesis (DDS, PWM, sigma-delta) are discussed. In the practical section of the thesis, DDS generator blocks are designed and described in VHDL language. The generator is intended to be fully controllable from PC computer via USB interface. PC control application was also designed. Analog circuits needed for output signal conditioning were designed and simulated. Simulation results are compared with measurement results in the final section of this thesis.
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Transient effect at the output of a linear dynamic system controlled pulse-width modulation
Petera, Martin ; Richter, Miloslav (referee) ; Jura, Pavel (advisor)
The goal of this work is to determine the size of overshoot produced at the output of a linear continuous second order system controlled by pulse width modulation. This work contains the calculation of the output signal response of the system in the time domain using the Laplace transform. The calculations of the amplitude of the output signal based on the pulse width modulation and system parameters are performed in this work. Finally the possibilities was given to determine the suitable period of pulse width modulation for required ripple. All the important calculations were compared with the simulations in the MATLAB-SIMULINK program and with the measurement at the real inertia second order cell.
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Class D audio power amplifier for bass guitar
Appel, Daniel ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
The main goal of this project was a synthesis of audio power amplifier and preamplifier for bass guitar with features suitable for this kind of instrument. The project was divided into 6 parts. The first part is a brief introduction to classes of power amplifiers, the second part is about function of blocks of which the class d audio power amplifier consist. In the third part the designed circuits and their properties are discussed. The simulation of circuits in PSICE are also included in this part. The design of power supply unit is discussed in fourth part. In the fifth there is design of chassis and other mechanical constructions. In the sixth part, there are results of experimental measurements of the amplifier prototype. In the appendix of this bachelor thesis are enclosed the schematics, printed circuit board designs, and photographic documentation of amplifier prototype.
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Class D 2.1 audio amplifier for laboratory measurements
Děcká, Klára ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
This semestral thesis deals with a draft and construction of the design of an class D audio amplifier with pulse width modulation. The resulting design consists of a supply protection, an active crossover and the output power stage itself. The amplifier is made in 2.1 configuration, the amplifier for mid/high audio frequency drives 2 × 30 W output into a 8 load, subwoofer drives 1 × 100 W into a 2 load. The control centre of the whole application is an integrated circuit TPA3116D2 by Texas Instruments company. The resulting audio amplifier will be used as a device for laboratory measurements.
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Switch mode supplies
Hladík, Jan ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the design of switched power supply for laboratory lessons. Forward converter was chosen as the topology of this power supply. Output voltage is adjustable from 0 V to 32 V. Power supply is capable of output current up to 10 A and output has adjustable current limiting. Following parts were designed: LC filter, pulse transformer, bridge rectifier with capacitor, power MOS-FETs driver, closed loop control with its auxiliary power supply. Cascade closed loop control is used for controlling of designed power supply. Control is analogue, operation amplifiers were used for its construction. PCB was designed for the whole power supply. Power supply was sucessfully assembled and tested.
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Transient effect at the output of a continuous-time LTI second order system controlled pulse-width modulation
Petera, Martin ; Richter, Miloslav (referee) ; Jura, Pavel (advisor)
The aim of this thesis is to determine the size of overshoot produced at the output of a linear continuous second order system controlled by pulse width modulation depending on the period and duty cycle of the modulation and system parameters. This thesis contains analytic calculation of the size of overshoot produced at the output of the second order system with damping ratio > 0, except the damping ratio equals to 1 (i.e. both underdamped and damped system) depending on period and duty cycle of the modulation. This thesis also includes a comparison of partial analytic results to numerical simulation in Matlab program and also with measurement at second order system model.
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Step-Up converter for mobile device
Gabriel, Petr ; Červinka, Dalibor (referee) ; Huták, Petr (advisor)
The purpose of this bachelor‘s thesis is about to intoduce possibilities of construction and use of switched power supplies. Thesis focuses mainly to description of different types of converters. There are possibilities of power supplie's design and sizing of its components described in this thesis. This thesis contains concrete design of power supply for realization. There are results of the measurement and comparision to the parameters given by manufacturer set forth at the end of this thesis.
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Laboratory source based on switching technology
Kočí, Martin ; Kubíček, Michal (referee) ; Brančík, Lubomír (advisor)
The aim of this thesis is a description of the dierent topologies used in switching power supply and subsequent use of acquired knowledge to select an appropriate topology, power supply, using the selected topology and the subsequent construction of laboratory source as a whole. Ideological content of the proposal are part of the power source based on the topology being used in switching power supplies, also on the controller working as buck converter controlled by PWM and the control section, whose mainfeature is the 8-bit microprocessor. The design is shown working with the designprogram PXLS Expert and the program for PCB Design EAGLE. Simulation shown in this thesis are implemented in the program OrCAD PSPice. Objective is to ervive all the functional blocks as a whole and the subsequent measurement of basic parameters, which are pro- cessed graphically. All parameters are measured at the end compared with the expected parameters and the simulations generated in the ideological content. Finally, the work is to evaluate all of the results obtained and compared with the primary objective of this work.
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Class D audio power amplifier with integrated DSP
Borsányi, Tamás ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This project deals with design and creation of a physically small, energetically effective audio amplifier, with extended tone corrections and user friendly settings. These expectations meets audio amplifier in class D with additional DSP, digital signal processor. Project includes overall design of all blocks, like A/D converter (PCM1850A), power stage together with DSP (TAS5706A), control unit (ATmega128) and power supply. In this work you’ll find theoretical description of class D, types of modulation, ways to convert analog signals to digital, short introduction to digital signal processing, options and limitations of these principles, description of specific circuits and layouts of printed circuit boards. The project further discusses the control program, its ways of solving the software for each block of the system, and finally includes the measurement of the prototype.
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