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Design of switch-mode audio power amplifier
Macek, Libor ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
This paper is divided into four parts. The first part deals with the description and explanation of the general principles of switching concept amplifiers. The second part is occupied with design of Class-D amplifier, a description of each block and calculations. A significant part of proposal of amplifier is based on simulations from programs Pspice and Filter Free. In the third part deign of power unit is discussed. The last part is focused on the measurement results on a prototype device.
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Helicopter model control
Štefanisko, Ivan ; Blaha, Petr (referee) ; Pohl, Lukáš (advisor)
In this paper we will introduce the existing model of a helicopter for teaching dynamic systems. Later, we will explore various control options of a model, and design laboratory tasks for the selected subject for bachelor‘s and master‘s study. In becoming acquainted with the model of a helicopter we describe hardware parts and the theoretical mathematical model. We can design controls after we have created a subprograms aimed at raising the rotational angle arms, pulse-width modulation to control the motor speed or creation itself control. The control methods we propose are the Ziegler-Nichols and frequency characteristics. The actual laboratory tasks will be formed with respect to the content of subjects taught bachelor‘s and master‘s study.
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Vývoj zařízení pro excitaci plazmatu a měření jeho parametrů
IŠKA, František
This bachelor thesis is focused on the design of high power switching power supplies for applications such as plasma excitation. In the teoretical part of this thesis some common topologies of switching power supplies and principles of their operation are described. Furthermore, theoretical part of this thesis deals with topics related to the designing of switching power supply such as principle of operation of power transistors, transformers and pulse width modulation. Practical part of the bachelor thesis is focused on design of power part of switching power supply with full-bridge topology, simulating of operation of its parts using Multisim programme, realization of this power supply and verification of its functionality by measurement.
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Lowest Level Control for FB-MMC Converter
Kokeš, Petr
The analysis and comparison of two basic methods for the lowest level control of the Delta-connected FB-MMC converter (Full Bridge, Modular Multilevel Converter) have been performed. The first method is the SA-PWM modulation (Sampled Average PWM) with cell voltage balancing of SORT-BAL type, where cells are sorted according to their voltages. The other is the PSC-PWM modulation (Phase Shifted Carrier PWM) with FBCK-BAL balancing, which uses feedback P-control of cell capacitors voltages.
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Helicopter model control
Štefanisko, Ivan ; Blaha, Petr (referee) ; Pohl, Lukáš (advisor)
In this paper we will introduce the existing model of a helicopter for teaching dynamic systems. Later, we will explore various control options of a model, and design laboratory tasks for the selected subject for bachelor‘s and master‘s study. In becoming acquainted with the model of a helicopter we describe hardware parts and the theoretical mathematical model. We can design controls after we have created a subprograms aimed at raising the rotational angle arms, pulse-width modulation to control the motor speed or creation itself control. The control methods we propose are the Ziegler-Nichols and frequency characteristics. The actual laboratory tasks will be formed with respect to the content of subjects taught bachelor‘s and master‘s study.
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Design of switch-mode audio power amplifier
Macek, Libor ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
This paper is divided into four parts. The first part deals with the description and explanation of the general principles of switching concept amplifiers. The second part is occupied with design of Class-D amplifier, a description of each block and calculations. A significant part of proposal of amplifier is based on simulations from programs Pspice and Filter Free. In the third part deign of power unit is discussed. The last part is focused on the measurement results on a prototype device.
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Transient Behavior of Active Front-End Rectifier under Unbalanced Voltage Supply
Chomát, Miroslav ; Schreier, Luděk ; Bendl, Jiří
Operation of voltage-source inverter supplied with unbalanced system of voltages is investigated in the paper. This situation can lead to problems in operation of an electric drive as voltage pulsations can arise in the DC-bus. Suitable kontrol methods may be applied to eliminate this effect in the aktive front-end rectifier. The paper particularly focuses on transient processes that accompany operation of the drive. They can be caused by changes in control of the drive, changes in load, or changes in the supply voltages.
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