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Robust Control of AC Electrical Drives
Pohl, Lukáš ; Prokop, Roman (referee) ; Brandštetter, Pavel (referee) ; Blaha, Petr (advisor)
The purpose of this disertation is to introduce and demonstrate a new approach to robust control of AC electrical drives. The proposed robust control method takes advantage of a nonlinear nature of AC motor d-q equations to construct self-scheduled LPV stator current controller. The benefit of this approach is in maitaining the robustness without any increase in conservatism of the H infinity controller. The resulting controller achieves fast and consistent response in the entire range of operating speeds. Rejection of the load torque disturbance is achieved with nonparametric H infinity speed controller in the outter loop of the cascade structure. The combination of LPV current controller and H infinity speed controller was verified on real-time simulation platform dSPACE ds1103. Simulation results for both types of AC motors (PMSM and IM) shows that the proposed solution is not only robust with respect to operating speeds but also impervious to wide range of load disturbance values.
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Desing and implementation of the LCC converter application for emulation validating of the integrated LLC converters
Pokorný, Ondřej ; Levek, Vladimír (referee) ; Prokop, Roman (advisor)
This bachelor’s thesis deals with the design of an LLC converter, which will be used for the verification of prototypes of integrated circuit designs, as well as its applications. First, we address why we chose the LLC converter specifically for this application. We continue by analysing the specific type of converter and describe its function. The main point of this thesis is the numerical design with input parameters, which concludes with a simulation which verifies the calculated values. The product of the thesis is the design of the final wiring diagram of the LLC converter and the test board (module) and their realisation on PCB. The thesis concludes with a verification of the whole construction using a test board in a practical measurement. The work includes the author’s own design of a transformer, as well as a discussion on the problematics of the usage of magnetic circuits for LLC converters.
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High-frequency oscillator in CMOS technology
Lang, Radek ; Musil, Vladislav (referee) ; Prokop, Roman (advisor)
This project focus to desing an on-chip oscillator in function as a clock generator. Frequency stability of the oscillator is affected by supply voltage, temperature and process variations. The aim is to propose a clock generator with sufficient frequency stability, low power consumption and a small chip area. This work deals with the types of oscillators and their basic building blocks suitable for our application. It also deals with the study and design options of temperature and process compensation circuit generating the current control, which provides the frequency stabilization of the output signal.
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Error analysis and optimization of low voltage BG reference
Koukol, Martin ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
The bachelor’s thesis deals with the design of Brokaw type low-voltage BG reference and it’s following optimalization using error analysis to achieve better precision than ±0,5 % with level of accuracy 4 sigma. The main focus of the thesis is the error analysis itself and finding the individual factors that affect precision. Design and optimalization of the voltage reference were made in program Cadence Virtuoso.
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Preamplifier for biological signals processing
Derishev, Anton ; Prokop, Roman (referee) ; Khateb, Fabian (advisor)
The work deals with the design and optimization of amplifiers in CMOS technology with low supply voltage and low power consumption. The main aim is to design an amplifier to amplify the biological signal. The first part is a brief introduction to the theory of biological signals. The work also contains a brief description of the biological signal processing methods and their properties. The important part is the description of the methods to reduce the supply voltage of the amplifier. The practical part of this thesis focuses on the design amplifiers with low supply voltage and low power consumption. All active elements and application examples have been verified by PSpice simulator using the 0.18 µm TSMC CMOS parameters. Simulated plots are included in this thesis to illustrate behavior of structures.
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SAE J2716 SENT protocol signal driver
Mutina, Petr ; Levek, Vladimír (referee) ; Prokop, Roman (advisor)
This diploma thesis deals with design of SENT protocol output driver for automotive applications. Output driver is designed with respect to variability of output capacitance (in rage from 0 to 10 nF). Important feature of output driver is output signal shaping to limit electromagnetic interference. First chapter deals with theoretical analysis, current solution is discussed too. Second chapter of this thesis is focused on design of concept. In third chapter design of output driver is discussed, in last chapter simulation results of the design are presented.
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Design of DA converter with fully differential output in CMOS technology
Mácha, Petr ; Prokop, Roman (referee) ; Kledrowetz, Vilém (advisor)
This diploma thesis deals with the design of eight-bit digital to analog coverter with fully differential outputs in technology I3T25 of ON Semiconductor company. The work contains the description of basic structures and characteristics of digital to analog converters. The main focus of the work is to design a converter and auxiliary circuits at the transistor level. The functionality of designed circuits is verified by simulation environment Cadence.
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Design of the latched comparator and its comparison with an opamp like comparator
Mrázek, Petr ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
The main content of this work is the design of four basic topologies of latched comparators and opamp like comparator. The introductory part of the bachelor thesis deals with the description, comparison and principles of operation of comparators such as opamp like comparator and latched comparators. In the practical part of this work is firstly performed the design of all the mentioned topologies of switched comparators and comparator of the operational amplifier type. Subsequently, they are compared with each other mainly in terms of their speed, accuracy, amount of kickback noise and consumption. At the end of the practical part, the design of these four basic topologies of switched comparators have been performed again, but already with the techniques for reduction of kickback noise applied to them. The whole work is concluded by the evaluation of individual acquired knowledge.
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