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Modular Power Supply for Formula Student
Ščípa, Samuel ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
This bachelor thesis is focused on the theoretical analysis and design of switching power supply with galvanic isolation. The implementation of the design is in the form of the power and control part of the modular power supply. The device parameters are suited for the needs and requirements of the development department of the electric student formula. Design configuration achieves a maximum output voltage of 1000 V and a current of 100 mA, which are user-adjustable.
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Electronic skylight
Coufal, Martin ; Šteffan, Pavel (referee) ; Boušek, Jaroslav (advisor)
Theoretical part of this thesis describes LEDs and other circuitry used for LED light design. LED light is designed, manufactured and put into operation. This thesis examines possibilities of measuring exterior light and its key parameters. The device uses two sets of LEDs – warm white and cold white to create light with parameters dependent on exterior light. LEDs are driven by constant current sources that are designed, manufactured and examined in this thesis. The device is microprocessor-controlled, which allows to switch between multiple modes of operation. Flyback SMPS is used to power the microcontroller.
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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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EMC of switched-mode power supplies
Olivík, Lukáš ; Dřínovský, Jiří (referee) ; Kolka, Zdeněk (advisor)
The goal of this thesis is to design flyback converter with given parameters complying with standards for electromagnetic compatibility. This thesis describes detailed design of the flyback converter. It summarizes the recommendations for PCB design. Knowledge from number of comparative measurements of the impact of component selection on conducted emission signature was applied during the flyback converter design. Big part of the thesis is aimed on conducted emission measurement and separation of common mode and differential mode emissions. The simple and fast Time domain measurement of conducted emission is described. Final measurement of designed converter was performed at the end of the thesis.
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PM1 UNDER THE MICROSCOPE: MULTI-ANNUAL AEROSOL OPTICAL PROPERTIES AND SIZE DISTIRBUTION OBSERVATION AT PERI-URBAN ATMOSPHERIC SITE ATOLL
Suchánková, Lenka ; Bourrianne, E. ; De Fillipi, R. ; De Brito, J. F. ; Riffault, V. ; Prokeš, Roman ; Holoubek, Ivan ; Ždímal, V. ; Crumeyrolle, S.
Atmospheric aerosols (AA) belong to short-lived climate forcers with high spatial and temporal variability. Although the radiative effects of AA are greatest on regional scales, changes in aerosol emissions can induce long-term global climate effects (Szopa et al., 2021). Thus, the measurement of aerosol properties is essential for better understanding of aerosol’s impact on health and climate. Although several international projects and platforms have been monitoring AA properties worldwide (GAW, WMO, ACTRIS, EMEP, EUCAARI, etc., Pandolfi et al., 2018), only PM10 or PM2.5 cutoff sizes have been used for measurements, and information about PM1 particles is missing. \nThe aim of this study is to present aerosol scattering properties with supporting data of absorption and particle number size distribution in PM1 in years 2018-2022 at peri-urban atmospheric site “Atmospheric Observations in LiLLE (ATOLL) in Lille, France. This study is the first to present results dedicated to aerosol scattering properties at this site.
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Atmospheric aerosol and hydrometeors
Jüthner, Ludvík ; Zíková, Naděžda (advisor) ; Hůnová, Iva (referee)
This thesis examines the interactions between ultrafine and fine modes of atmospheric aerosol and precipitation episodes of rain, snow and drizzle. For the research were used data from the period 1.11.2018 to 30.4.2020 at the rural background station Milešovka. It was chosen a combination of a disdrometer together with a Scanning mobility particle sizer spectrometer (SMPS) for the data collection. Ten-minute averages were then used to determine the change in aerosol particle concentration during individual precipitation episodes and to calculate the scavenging coefficient. Then was calculated a Pearson correlation to determine the effect of raindrop size, rainfall intensity, temperature, relative humidity and wind speed on the decrease in aerosol concentration by individual hydrometeors. Finally, a cluster analysis of the air mass history was performed. An assessment of the change in aerosol particle concentration during each event showed that although all three selected hydrometeors contributed to the decrease in particle concentrations, only rain caused a decrease in all size classes (-5,7%). The result of the scavenging coefficient estimation further confirmed the higher success of rain, with a median coefficient of 6,62 x 10-4 s-1 . The atmospheric cleaning by rain then proceeded best between...
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Nixie clock
Ščípa, Samuel ; Novotný, Radovan (referee) ; Levek, Vladimír (advisor)
This thesis focuses on the design and implementation of a nixie clock. In the introduction, the thesis deals with the history of the origin and the principle of the function of this vintage technology. It describes in detail the function and design of the support and control circuits to operate these character discharge tubes. It addresses the design and implementation of the hardware part of the clock. Further, the software part of the device is discussed in detail, which provides the normal functionality of the clock, such as stopwatch, alarm, timer, temperature measurement, supplemented with modern features such as Wi-Fi, RGB backlight a USB-C for power and programming. The final stage is the implementation and testing of the finished device.
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Modular Power Supply for Formula Student
Ščípa, Samuel ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
This bachelor thesis is focused on the theoretical analysis and design of switching power supply with galvanic isolation. The implementation of the design is in the form of the power and control part of the modular power supply. The device parameters are suited for the needs and requirements of the development department of the electric student formula. Design configuration achieves a maximum output voltage of 1000 V and a current of 100 mA, which are user-adjustable.
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Electronic skylight
Coufal, Martin ; Šteffan, Pavel (referee) ; Boušek, Jaroslav (advisor)
Theoretical part of this thesis describes LEDs and other circuitry used for LED light design. LED light is designed, manufactured and put into operation. This thesis examines possibilities of measuring exterior light and its key parameters. The device uses two sets of LEDs – warm white and cold white to create light with parameters dependent on exterior light. LEDs are driven by constant current sources that are designed, manufactured and examined in this thesis. The device is microprocessor-controlled, which allows to switch between multiple modes of operation. Flyback SMPS is used to power the microcontroller.
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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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