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Car-battery charger
Kadlec, Josef ; Procházka, Petr (referee) ; Červinka, Dalibor (advisor)
This bachelor’s thesis is considered by projection and construction of the car battery charger with switching source. One-pulsed conducting changer is base of this charger. The charger is intended for accumulators of nominate voltage 6 and 12V. Accumulators are charged by method of constant voltage with current limitation of 0.5A, 5A, 20A and 50A. Value 50A has reason during stating of car for example in winter, because the charger helps to battery. The device is equipped with additional protection, which protects the charger and also the accumulator and the supply network. Three pilot lights are the next equipment of the device.
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Motor parameter identification for laboratory stand
Lidmila, Petr ; Kadlec, Josef (referee) ; Červinka, Dalibor (advisor)
The goal of introduced thesis is to provide measurement of the engines used as a tutorial laboratory stand in the course “Electric drives”. Due to the absence of appropriate measurement centre, the main emphasis is laid on the modernization of older dynymometer, which is going to be used by the students. Dynymometer has been equipped with the electric speed and torque vbmeasurement, data from these measurements are displayed and evaluated by the digital devices very clearly and precisely. Engines parameters measurements has only marginal importance in this thesis.
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Accumulator tester
Pisca, Marek ; Kadlec, Josef (referee) ; Cipín, Radoslav (advisor)
This master´s thesis is dealing with the theory of Li-ion accumulators and theirs charching. In this thesis has been designed accumulator tester for automatic charging and discharging of Li-ion accumulator. This tester is controlled by microprocessor.
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Flyback power supply from the mains
Polián, Josef ; Kadlec, Josef (referee) ; Huták, Petr (advisor)
This bachelor thesis deals with the issue of switching power supplies. The aim is to design regulated switching power supply that will be powered from the mains. The first part focuses on theoretical knowledge of the switching power supply and describes circuits of TOPSwitch. Another part is the actual design of all circuits. The last part is the actual implementation of switched mode power supply and measurement that verifies its functionality and features.
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Step down convertor
Koutný, Martin ; Kadlec, Josef (referee) ; Cipín, Radoslav (advisor)
Thesis deals with the evaluation of the solutions and the design of the DC voltage converters. The first describes the different types of converters, which subsequently choose types of resources for the construction. In other chapters of the work devoted to the design of schemes, selected types of sources and selection of circuits and components therefor, for the manufacture, including calculations cooling performance parts. The last chapter is devoted to the description of the structure and measurement of the produced sources. The measurements are primarily deals with the verification of the specified parameters.
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High power switch-mode supplies - parallel connection
Kadlec, Josef ; Richter, Aleš (referee) ; Mindl,, Pavel (referee) ; Patočka, Miroslav (advisor)
This doctoral thesis deals with the issue of high power switched-mode power supplies that are designed as modular systems. The thesis describes series, parallel and series-parallel possibility of connected converters. System can achieve extremely high output current for converters connected in parallel. For converters connected in series, the system can achieve extremely high output voltage. The main goal of this thesis is to develop so-called reconfigurable modular system. It is a system that can change converters connection of serial, parallel or series-parallel connection - during its operation. This option to change converters connection significantly extends the control range of output voltage and output current of the whole system. For all these mentioned variants of the modular system there are described and simulated suitable control schemes. The issue of interleaved PWM is described in the thesis. Output voltage ripple and current ripple equations were derived for each converters connection. These equations, which were derived either for systems with interleaved PWM or for systems without of phase shifted PWM, are also proved by simulations. Design of reconfigurable modular system with power of 9.6 kW that contains four converters was introduced in this thesis. Converters use modern transistors and diodes of SiC material. The proposed reconfigurable modular system was successfully manufactured. The measurement results are also shown in the work.
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