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Lab power supply 0-100 V / 0-100 mA
Hanzl, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The thesis deals with the design of a laboratory source of atypical parameters of the voltage range 0 – 100 V and current 0 – 100 mA, which will be used for testing LEDs, measuring the reverse voltage and characteristics of Zener diodes of unknown data. The power supply will operate in linear mode, where the output part make up a power unipolar transistor controlled by a controlled bipolar transistor. The control section controlling this output stage is a closed control loop with two PI controllers, a differential amplifier and a controlled limiter. In the control circuit, the controllers are arranged in a cascade structure, where the voltage regulator is superior to the current one. Power supply is provided by 2 transformers, one for the power part and the other for the control part. All designed and assembled components will be then placed in a box equipped with a digital measuring device with display.
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LiFePO4 battery charger 14,6 V 100 A
Hanžl, Ondřej ; Folprecht, Martin (referee) ; Martiš, Jan (advisor)
This thesis deals with a design, construciton and testing of a switch-mode power supply (SMPS) which is working as a LiFEPO4 battery charger with output current up to 100~A and output voltage up to 14,6~V. The output voltage and current can be regulated by the operator from zero to maximum value. For this SMPS Half-bridge asymmetrical forward converter with two transformers and common output inductor topology is chosen. The control circuits are run by the IC SG3525. Cascaded regulation of output voltage and current is implemented by two discrete operational amplifiers. Undervoltage protection of the control circuits and independent overcurrent protection on the primary side is also implemented.
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Converter for DC motor with sensorless speed control
Hanzl, Ondřej ; Martiš, Jan (referee) ; Tománek, Radek (advisor)
The scope of work is the design of a converter with sensorless speed control for a DC motor with permanent magnets with a power of 500 W at a voltage of 48 V. The whole device consists of two parts, a single-acting pass converter, which serves as a power supply with parameters 0 ÷ 60 V/0 ÷ 20 A for laboratory purposes, and on the hand as a power supply for a four-quadrant pulse converter for the speed control itself with user settings, electronic reversal of the direction of rotation and motor braking. The control of both inverters is provided by control circuits implemented digitally. All components will then be designed for measuring printed circuits boards of strandardized dimensions as plug-in modules to be built into instrument cabinet for easy disassembly and access in the case of controls.
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Magnetohydrodynamic Generator Laboratory Model
Hanžl, Ondřej ; Krbal, Michal (referee) ; Radil, Lukáš (advisor)
This bachelor thesis is focused on the issue of magnetohydrodynamic (MHD) power generation, in particular a laboratory model of MHD generator is constructed. The thesis is divided into a theoretical and an experimental part. The theoretical part deals with the principle of MHD power generation and with MHD generators generally. In the experimental part the model itself is described. It uses common aqueous solutions as a working fluid and four neodym magnets to create a magnetic field. The model was successfully tested and generated voltage and current were measured.
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Converter for DC motor with sensorless speed control
Hanzl, Ondřej ; Martiš, Jan (referee) ; Tománek, Radek (advisor)
The scope of the work is the design and implementation of a test sample of a converter with sensorless speed control for a DC motor with permanent magnets. The whole device consists of two main parts, namely a two-switch forvard converter, which serves both as a power source with parameters 0 ÷ 60V/0 ÷ 20A for laboratory purposes, and as a power supply for a four-quadrant pulse converter for the speed control of the electric motor. The control of both converters is ensured by digital control circuits. All components are placed on printed circuit boards of standardized dimensions as plug-in modules designed to be built into the instrument cabinet for easy disassembly and accessibility in case of checking measurements.
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Converter for DC motor with sensorless speed control
Hanzl, Ondřej ; Martiš, Jan (referee) ; Tománek, Radek (advisor)
The scope of work is the design of a converter with sensorless speed control for a DC motor with permanent magnets with a power of 500 W at a voltage of 48 V. The whole device consists of two parts, a single-acting pass converter, which serves as a power supply with parameters 0 ÷ 60 V/0 ÷ 20 A for laboratory purposes, and on the hand as a power supply for a four-quadrant pulse converter for the speed control itself with user settings, electronic reversal of the direction of rotation and motor braking. The control of both inverters is provided by control circuits implemented digitally. All components will then be designed for measuring printed circuits boards of strandardized dimensions as plug-in modules to be built into instrument cabinet for easy disassembly and access in the case of controls.
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Factors influencing the success of restricting the development and use of technology
Hanzl, Ondřej ; Kučera, Tomáš (advisor) ; Střítecký, Vít (referee)
The primary goal of this thesis is to analyze and compare the impact of political and technological influences on the breakdown of disarmament efforts between the two world wars. This issue is approached by analyzing the string of disarmament conferences that took place in the interwar period and restrictions placed on the German military imposed by the Treaty of Versailles. The theory that serves both as inspiration and a tool to examine the subject is the Actor-network theory originating from École nationale supérieure des mines de Paris. This theory is used to view the subject in a new light. The author places military technology, the political movement of disarmament, and especially restrictions of Germany on par with states and international organizations. While the political turmoil and causes and effects are well researched and documented, the technological aspects of the issue less so. The author asks if the disarmament efforts were realistic in their scope. Whether a state abiding by the new rules could even mount a feasible defence in a case of attack and retain offensive capabilities. Whether the technology itself allowed the existence of alternative weapon systems not breaking these rules. And in the case of Germany, whether these restrictions were effectively limiting German potential...
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Lab power supply 0-100 V / 0-100 mA
Hanzl, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The thesis deals with the design of a laboratory source of atypical parameters of the voltage range 0 – 100 V and current 0 – 100 mA, which will be used for testing LEDs, measuring the reverse voltage and characteristics of Zener diodes of unknown data. The power supply will operate in linear mode, where the output part make up a power unipolar transistor controlled by a controlled bipolar transistor. The control section controlling this output stage is a closed control loop with two PI controllers, a differential amplifier and a controlled limiter. In the control circuit, the controllers are arranged in a cascade structure, where the voltage regulator is superior to the current one. Power supply is provided by 2 transformers, one for the power part and the other for the control part. All designed and assembled components will be then placed in a box equipped with a digital measuring device with display.
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LiFePO4 battery charger 14,6 V 100 A
Hanžl, Ondřej ; Folprecht, Martin (referee) ; Martiš, Jan (advisor)
This thesis deals with a design, construciton and testing of a switch-mode power supply (SMPS) which is working as a LiFEPO4 battery charger with output current up to 100~A and output voltage up to 14,6~V. The output voltage and current can be regulated by the operator from zero to maximum value. For this SMPS Half-bridge asymmetrical forward converter with two transformers and common output inductor topology is chosen. The control circuits are run by the IC SG3525. Cascaded regulation of output voltage and current is implemented by two discrete operational amplifiers. Undervoltage protection of the control circuits and independent overcurrent protection on the primary side is also implemented.
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Magnetohydrodynamic Generator Laboratory Model
Hanžl, Ondřej ; Krbal, Michal (referee) ; Radil, Lukáš (advisor)
This bachelor thesis is focused on the issue of magnetohydrodynamic (MHD) power generation, in particular a laboratory model of MHD generator is constructed. The thesis is divided into a theoretical and an experimental part. The theoretical part deals with the principle of MHD power generation and with MHD generators generally. In the experimental part the model itself is described. It uses common aqueous solutions as a working fluid and four neodym magnets to create a magnetic field. The model was successfully tested and generated voltage and current were measured.
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