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Design and fabrication of a device controlling the important parameters of the aquarium based on the selected microcontroller
Cagáň, Adam ; Levek, Vladimír (referee) ; Háze, Jiří (advisor)
This master’s thesis describes design of the system, which automatically regulates water temperature in aquarium and measures water hardness. There is performed thermal analysis of specific model of aquarium, which defines required heat power. Based on this power Peltier module and heat exchangers are selected, that are part of designed heat pump. Thesis describes design of control unit based on ESP32-S3 microcontroller and complementary power supply circuit for Peltier module and uninterruptible power supply for microcontroller. Subsequently, there is designed web user interface running on Raspberry Pi 4B, which allows user to change desired water temperature, lighting interval and display measured water parameters.
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Autonomous control system for composite materials heating
Lapčák, Adam ; Levek, Vladimír (referee) ; Šteffan, Pavel (advisor)
This thesis focuses on designing an autonomous system intended for heating surfaces made of conductive composite material. The design involves smart electronics design for integration into distribution boards and the ability to control power switching elements. Emphasis is also placed on the possibility of remote system control via the internet network. For an easy deployment in any location, the autonomous system will use a mobile network. System control will be realized with a dedicated HTTP API server along with a custom user application.
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Effect of electromagnetic compatibility on the operation of automotive LED drivers
Vinklerová, Viktorie ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
The diploma thesis deals with electromagnetic compatibility, its bonds, measuring devices and interference sensors. Furthermore, the thesis includes a discussion of nearfield probes, standards CISPR25 and TEM chamber methods. It describes two integrated circuits NCV78964 and NCV78514 LED drivers from onsemi and their modules. The aim of the work is to design the measurements, then to implement and evaluate them. Finally, to optimize the operating parameters of the drivers with respect to both EMC and driver functionality.
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Design and implementation of a platform for control LLC-type inverter with a wide input supply voltage range using a FPGA circuit
Pokorný, Ondřej ; Levek, Vladimír (referee) ; Prokop, Roman (advisor)
This master’s thesis deals with the emulation of LLC converter control with a wide input voltage range using a created emulation platform. The first part of this work is focused on the design of resonant converters with a wide input voltage range. Based on theoretical knowledge, an adjustment of the emulation LLC converter is made. The converter modification is concluded with a simulation, where the correctness of the design and the fulfillment of the ZVS parameter in the entire input voltage range are verified. In the next part of the work, an analysis of the control issues of resonant converters, more precisely LLC type resonant converters, is carried out. The acquired knowledge is used for the design of a new emulation platform, which will serve for the emulation of LLC converter control with a wide input voltage range. The last part of the work is the creation of an emulation program for FPGA in SystemVerilog language. The work is concluded by verifying the functionality of the emulation on physical hardware.
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Universal audio interface for autonomous use
Trojak, Ondřej ; Šťáva, Martin (referee) ; Levek, Vladimír (advisor)
This text analyses the current situation within the audio signal work field and the appropriate ways of connecting electronic networks for processing blocks. The thesis deals with circuit design, firmware programming and physical realization of a subsequently measured autonomous battery-powered interface which provides volume control of input signals and conversion of different types of connectors and signal lines, consuming low power and adding low noise. The device is also equipped with a phantom power supply for condenser microphones. The control consists of a set of buttons, a rotary encoder and a display unit.
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Service device for automatic sanitary equipment
Kudláček, Martin ; Levek, Vladimír (referee) ; Šteffan, Pavel (advisor)
The aim of this thesis is to inform readers about the basic principle of electronics for which the service module for the automatic sanitary technique will be designed, as well as design and describe the most important parts of the module theoretically. Likewise, the thesis deals with the most common mistakes in the design of printed circuits boards with respect to the resistance of the resulting device against interference. The implementation itself includes both module design and a communication algorithm for connecting multiple service modules and their remote control using the Raspberry Pi minicomputer. The thesis also contains a design of algorithm for verification of data transmission by the transmission system.
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Precise LED lamps dimming for stage technology
Šojdr, Marek ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
This bachelor´s thesis discusses the problems of dimming of LED bulbs using DC voltage. It explains basic converters topologies and power factor correction options. Part of the thesis deals with the subharmonic oscillation and possibilities of its elimination. Describes the design of the circuitry of dimmer module for precise dimming of selected types of LED bulbs, revival and testing of the dimmer module. Part of the work is basic for realization of the dimmer (printed circuit board, list of components).
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Speleological flashlight
Kaderka, Jakub ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
Existing speleology headlamps are discussed and several improvement are proposed in the beginning of the thesis. A switched hystersis buck LED driver is designed. Part selection process is mentioned with focus on driver efficiency. Li-Ion charger and battery protection circuit is discussed. Final part of the thesis describes construction of working lamp prototype and measurements of its characteristics. The LED driver reaches efficiency of 96 %, the maximal luminous flux is 869 lumens. The automated light regulation based on measuring amount of reflected light was found to be inefficient in a muddy underground.
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A Touch Sensor on the Glass Plate with a Backlit Pictogram
Jánešová, Daniela ; Levek, Vladimír (referee) ; Šťáva, Martin (advisor)
This thesis describes the solution of controlling device by capacitive-touch sensor. The geometry of the sensor is solved on standard printed circuit board, which is placed on the glass-made panel. In general, the theme of touch sensors is solved in the world by several companies and it is based on capacitive principles. They are described at the beginning of the work. By far, the main part of the work is focused on specific solutions with chosen integrated circuit for evaluation of touch sensor.
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Electronic attendance system
Valent, Adam ; Levek, Vladimír (referee) ; Šandera, Josef (advisor)
The goal of the bachelor thesis “Electronic Attendance System” is create a full-featured interactive and modern attendance system with web page, server and database. Employees will be able to create attendance records by attaching the RFID chip to hardware part of an attendance system. Database records will be possible to browse, edit end export to a CSV file.
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