|
|
Intelligent charger for Pb accumulators
Hadwiger, Tomáš ; Šebesta, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor project deals with lead accumulator charging. The properties of this acumulator charger are described here and the best possible way of charging has been based on these properties. The capacity of the accumulators has also been taken into account. The charger itself is able to distinguish between the twelve-volt and the six-volt accumulator. The charger prevents accumulators from overcharging and does not charge damaged ones.It also contains the protection against reversing polarity. The project contains complete scheme, DSP layout, lists of components and their placement on the DPS. The design of the transformator suitable for the charger is also included.
|
|
|
Mains charger with variable output voltage.
Dittrich, Marek ; Šteffan, Pavel (referee) ; Boušek, Jaroslav (advisor)
Nowadays every portable electronic device, tool or machine is powered by some type of accumulator. It is not possible to standardize types because the use of batteries is influenced by the power output, capacity, weight or price. They also differ in charging voltage, depending on their chemical composition. For this reason, it is often necessary for each type to have its own charger. In this case, an attempt has been made to simplify charging and reduce charger procurement expenses by designing a charger with adjustable voltage from 2.6 V to 20 V. This range can cover the charging of most types of accumulators available on the market.
|
|
|
Charger for a battery supply of an oscilloscope
Novák, Miroslav ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
This bachelor thesis deals with the design and construction of a battery charger for an oscilloscope battery source. The output parameters of this charger are: output voltage 4.1 V and output current 15 A. The charger is designed as a flyback converter controlled by the integrated circuit UC3844. First, the possible topologies of the inverter are described. Then the selected flyback converter and the subsequent design of the power parts and the control circuit are described. Then the measurement where the transformer leakage was too large is described. Therefore, the following section describes the modification of the charger design, which uses a snubber network to eliminate the effect of leakage. This is followed by a description of the mechanical design of the charger. Finally, measurements of the charger are documented, testing problems are described, and the results obtained are evaluated.
|
|
|
Electric Powered Offroad Motorcycles
Kobza, Tomáš ; Šebela, Kamil (referee) ; Janoušek, Michal (advisor)
This thesis is focused on the study of off-road electric motorcycles, both currently available and prototypes under development. The work describes the history of electric motorcycles up to the present knowledge, construction issues, the types of drive units and batteries used. It compares an electric-powered motorcycle with a conventional-powered motorcycle.
|
|
|
Smart charger with cell identification
Podaný, Matěj ; Povalač, Aleš (referee) ; Kubíček, Michal (advisor)
This thesis is looking for a suitable method of unambiguous identification of charging cells, so that it can monitor their capacity in the long term and eliminate defective cells. It proposes several such methods where only the most suitable one is selected for the subsequent demonstration. It describes the basic properties of rechargeable cells and selects the one that could be used to demonstrate the selected method of cell identification. It designs an intelligent battery charger which demonstrates the chosen method of identification on modified charging cells.
|
|
|
Electric cars as the ecological future of transport
Mironova, Alexandra ; Walek, Agata (referee) ; Jašková, Jana (advisor)
Cílem této bakalářské práce je popsat elektrické dopravní prostředky s ohledem na jejich vliv na životní prostředí v porovnání s běžnými dopravními prostředky. V úvodu práce porovnává běžná auta a elektromobily a jejich vliv na životní prostředí. V další kapitole je popsáno historické pozadí elektromobilu. Následující část vypraví o několika typech elektromobilu a popisuje jejich vlastnosti. Poslední kapitola vysvětluje vliv na životni prostředí a návrhy pro zlepšeni ekologické situace.
|
|
|
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.
|
|
|
Fast-charger for lead-acid batteries 12 V
Kopuletý, Ondřej ; Pazdera, Ivo (referee) ; Vorel, Pavel (advisor)
This Master thesis deals with modification of lead battery charger connection. In particular, changes are made to the control board. The theoretical part describes the principle of charging lead batteries and the description of the basic types of switching power supplies. Furthermore, the dimensioning of important components in the circuit together with the optimization of the switching frequency and the parameters of the high-frequency transformer are also presented. At the end of the thesis is the procedure of assembling the whole charger.
|
|
|
Uninterruptible Power Supply
Mrázek, Petr ; Harabiš, Vratislav (referee) ; Sekora, Jiří (advisor)
The thesis deals with Uninterruptible Power Supply (UPS) and associated problems of backup power in case of unexpected outages of electricity. Start of work is dedicated to limitation of the electricity supplies, as well as their causes and consequences. Furthermore, brief history of UPS and subsequently distinguish between UPS’s architectures. There is also a description of the energy sources such as batteries, flywheels or fuel cells. Part of thesis describes security of electricity supply in health care facilities, including requirements for emergency power. The own design of UPS is described in the end.
|
|
|
Charger for lead-acid batteries
Kopuletý, Ondřej ; Procházka, Petr (referee) ; Ondrejček, Vladimír (advisor)
This bachelor‘s thesis deals with the modification, construction and testing of lead-acid battery chargers. It is described the principle of charging the batteries and individual topology of the switching power supplies. The original schematic diagram is taken from the thesis of Josef Kadlec. Diagrams of a power and control circuit have been modified. The topology of the charger is two switch forward converter with pulse transformer. The charging method is constant voltage with current limiting.
|
guest ::
