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Verification series of fast-chargers for lead-acid accumulators 12V and 6V
Benada, Tomáš ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This thesis is an engineering design of an intelligent fast-charger for lead-acid accumulators. It contains calculations of each component. The switching power supply is the mainstay of the charger that makes the charger portable, lightweight and small. The Intelligent fast-charger for lead-acid accumulators charges the accumulator by method of constant voltage with current limitation of 0,5A, 5A, 10A, 50A. 50A current is used in winter during starting of a car, when the battery can´t provide sufficient current. There are three LEDs placed on the front side of the charger reflecting status of the device. The device comprises safety protection for the charger, supply network and battery.
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The electric precipitator
Broďák, Kamil ; Patočka, Miroslav (referee) ; Huták, Petr (advisor)
The Bachelor’s thesis is focused on the issue of power separation. The first part describes the principle of power separation process. The second part deals mainly with mechanical parts and their function inside the electric precipitator. The third part focuses on the use of electrostatic precipitators and system management. The last section is devoted to design an electric precipitator according to the specified parameters. Due to the dominance of electric separators company ZVVZ-Enven Engineering, Milevsko from the Czech and Slovak Republics, the work focuses primarily on the products offered by their production program.
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Switching charger for car batteries 14.4V/6A
Gábel, Marián ; Huták, Petr (referee) ; Martiš, Jan (advisor)
This bachelor's thesis deals with issue of design of a switching charger for car batteries using a fly-back converter. The fly-back converter and its functions are theoretically described in the first chapter, which also explains use of a modification of a circuit. The modification is used because of its increased efficiency compared to the ordinary loss solutions of a relieving circuit. Subsequently, in next chapter the thesis focuses on design of a power section of the circuit, which involves calculations of the circuit’s elements. Subsequently, the MOSFET transistor control design is performed using the UC3844 integrated circuit. The charger was constructed according to design and its proper functionality was verified by measurements.
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System of DC/DC converters for solar cells of a fotovoltaic power plant
Benda, Dušan ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This master thesis describes the design of a DC/DC converter for one photovoltaic panel with a 250 W peak power. The master thesis is divided into parts dealing with detailed design of power electronics, analog circuit design, description of control MPPT algorithms and software for control circuit. The chapter with the mathematical modeling of the converter created in the Matlab Simulink was added beyond the assignment.
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Calculation of the optimum slip frequency with respect to the minimum losses of an induction motor
Prudík, Martin ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
A mathematical model describing the calculation of the optimal slip frequency of an Induction Motor with squirrel-cage is proposed in this work. The derivation is done using a replace -network, and is designed for a wide range of speeds and torque. The requested torque, speed and constants of replacement network are the inputs of the optimization. Optimum slip frequency and corresponding line voltage are the outputs of this optimization. The results of the calcullations are presented using two asynchronous machines for different speed and torque.
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The temperature measurement with semiconductor sensor
Dostálek, Martin ; Klíma, Bohumil (referee) ; Huták, Petr (advisor)
This bachelor work disserts on measurement of temperature using the electronic temperature sensors DS18B20, which are controlled by microcomputer type AVR. This sensors use for communication the 1-wire type data bus. The 1-wire data bus, designed by Dallas Semicondoctor, allows connect more devices to the control unit using two wires. This type of measuring elements offers simple handling for the user. The sensor transforms the measuring data directly to the digital data. The rate of the transmission is determined by number of bits in the resultant value and the sensor is programmable during attendance by the set mechanism (master). The sensor code is consistent with the value of measured temperature. That means it doesn’t require supplemental decoding. The resulting data are worked up and displayed on LCD continuously. First part of this work is focused on the theory of 1-wire element. Further, there is an explanation of the principle of the measuring sensor function and its controlling by the control unit. Next, there is a basic description of the AVR type microcomputers, more detailed description is aimed at the ATiny2313 controller, which is used in this work. The important part is dedicated to the implementation of the 1-wire protocol to the appropriate control unit.
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Electronic load
Doležel, Jiří ; Vorel, Pavel (referee) ; Huták, Petr (advisor)
Bachelor’s thesis deals with the analysis solutions and construction of the DC electronic loads. At the beginning, they describe the basic principles of electronic loads. In other parts of the work is compared commercial electronic loads, under which the requirements will be selected on the proposed electronic load. In other chapters of the work devoted to the design of schemes and selecting components for their manufacture, including dimensioning of cooling power parts. The last chapters are devoted to describing the design and measurement of electronic load.
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Miniature charger for a battery pack Li-ion 14,4V/2Ah
Bartoš, Miroslav ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This bachelor‘s thesis describes the design chargers for lithium-ion batteries. The proposal includes the selection of suitable converter topologies, design power, control and excitation components and a design of high frequency transformer. In the next part the thesis deals with the BMS, which stands for battery management system. The last part deals with the production of the proposed switching source and BMS. The project documentation for the production of a charger is also provided.
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Experimental flyback switching supply 1200 W/150 kHz with SiC switches
Grom, Martin ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This master’s thesis deals with design and construction of experimental flyback converter with utilization of novel lossless clamp circuit for switching transistor and with utilization of silicon carbide devices. The issue of flyback converter for higher power and possible control strategies are discussed. The thesis also describes power and control circuits design, design of PCB, construction of the converter and measured waveforms. End of the thesis contains technical documentation of designed board. Designed converter was successfully built and tested.
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Regulated power supply 50V/5A
Herman, Tomáš ; Vorel, Pavel (referee) ; Huták, Petr (advisor)
Bachelor´s thesis deals with the adjustable DC voltage source. The first part deals about the typical involvement of resources and consequently the properties of individual components resources. The second part is the actual design of control circuits, selection of components, wiring and PCB design.
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