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Solar charger with balancing circuit for 4 cell battery pack working in an IoT network
Šlígl, Jan ; Kufa, Jan (referee) ; Herceg, Erik (advisor)
This bachelor thesis deals with the design of a circuit for charging control of the four battery cells using solar energy. Passive balancing is applied to the separate cells. The measured cell voltage should then be sent via the LoRa network. The proposal mainly considers low energy consumption, compactness and independence. The appropriate function is then verified using MATLAB Simulink simulations and subsequently tested on the STM32 development kit. The result will be a finished printed circuit board design and simulation of important parts of the device.
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Localization module for IoT network
Eliáš, Martin ; Kufa, Jan (referee) ; Herceg, Erik (advisor)
This bachelor thesis deals with construction of portable GNSS locator for multiple uses. This locator will be sending measured data via LoRaWAN IoT network. The aim of this bachelor thesis is to create a device with low current consumption and with highest possible operating time on a battery. The device consists of environmental sensors.
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Power audio amplifier used for laboratory measurements
Herceg, Erik ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This Bachelor thesis deals with the scheme of low-frequency amplifier in AB class which is going to be used for laboratory measurement. The scheme was realized with semiconductor components and the power part of the amplifier was made of bipolar transistor. The main part of the work was focused on the measurement protocol. The functionality of the amplifier was verified and simulated in the theoretical way and met the criteria. The form of the measurement protocol was realized in agreement with instructions and contains all the required parameters of the measurement. The objective of this thesis is to explain how to design an amplifier and to illustrate the measurment methods of its parameters
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External Part of the Receiving System for UHF Satellite signals
Sýkora, Jan ; Herceg, Erik (referee) ; Urbanec, Tomáš (advisor)
This bachelor thesis deals with omnidirectional antennas in the UHF band, especially Lindenblad’s omnidirectional antenna and its nulls in the radiation pattern. The aim was to design a preamplifier, power supply circuit and bias tee with the transmission of power supply, UHF signal and reference GPS signal through single coaxial cable towards a receiver. A further requirement was to design a mechanical part of the antenna which holds it together with considering modern manufacturing processes - 3D print. The final task was the measurement of antenna’s real parameters.
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Power amplifier for 435MHz Band with High Efficiency
Herceg, Erik ; Špaček, Jiří (referee) ; Urbanec, Tomáš (advisor)
This diploma thesis is focused on design of high frequency power amplifiers in UHF band, specifically at 435 MHz. Amplifiers are designed in different classes of operation. The thesis deals with the comparison of main parameters in each class of operation, the most important parameter is effeciency. The amplifying part is unipolar transistor which is working in Single-stage mode. The results were simulated in Advanced Design Systems Software.
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Intrinsic And Extrinsic Parameters Of Galium - Nitride Transistors
Herceg, Erik
This article deals with the extrinsic and intrinsic parameters of the Galium-Nitride RF transistor. These parameters are essential in any design of large-signal analysis of RF amplifiers. Package parasitics are the biggest problem of integrated circuits (ICs), especially at high frequencies. Each IC package gives unwanted parasitics to the primary function of the IC. The analysis of these package parasitics can be performed by the transistor manufacturer, which provides a non-linear model of the transistor, where parasitics elements are separated from the transistor. With these separated package parasitics, the highest efficiency, power output, and accurate harmonic termination can be achieved. The main purpose of this article is to describe these problems.
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Localization module for IoT network
Eliáš, Martin ; Kufa, Jan (referee) ; Herceg, Erik (advisor)
This bachelor thesis deals with construction of portable GNSS locator for multiple uses. This locator will be sending measured data via LoRaWAN IoT network. The aim of this bachelor thesis is to create a device with low current consumption and with highest possible operating time on a battery. The device consists of environmental sensors.
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Passive Balancer For Eight Cell Battery Lifepo4 Pack
Herceg, Erik
This Article deals with the passive balancer that is required in all multi-cell battery systems. The balancer is designed for eight LiFePo4 battery cells that are connected in series, to achieve the required voltage of about 28 V. Each cell has a capacity of about 9600 mAh, resulting in a 80 Ah battery back. The balance algorithm is performed by main STM32 microcontroller (MCU), which controls eight balancing transistors. For measuring battery cell voltages, there are two variants of cell measurement. The first alternative of cell measurement is a battery monitor IC, which is also capable of low side current measurement and as protection it also drives the low side current transistor switch, which protects powered device. Other options are measurement by 14-bit analog to digital converter (ADC) or with internal ADC of MCU. The balancer circuit also includes an RS485 interface for communication with other devices.
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Solar charger with balancing circuit for 4 cell battery pack working in an IoT network
Šlígl, Jan ; Kufa, Jan (referee) ; Herceg, Erik (advisor)
This bachelor thesis deals with the design of a circuit for charging control of the four battery cells using solar energy. Passive balancing is applied to the separate cells. The measured cell voltage should then be sent via the LoRa network. The proposal mainly considers low energy consumption, compactness and independence. The appropriate function is then verified using MATLAB Simulink simulations and subsequently tested on the STM32 development kit. The result will be a finished printed circuit board design and simulation of important parts of the device.
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