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Step down DC/DC converter with high efficiency
Chudý, Andrej ; Cipín, Radoslav (referee) ; Procházka, Petr (advisor)
This bachelor's thesis deals with design and realization of several versions of DC/DC buck converter. The theoretical part of the bachelor's thesis is focused on the general analysis of DC/DC converters with a detailed description of the buck converters. Another part specializes in the analysis of the current state in this field, where the basic differences between the synchronous and diode rectifier are explained, electromagnetic interference and GaN transistors are described. Subsequently, the thesis involves the design and calculations of necessary parameters of the buck converter. Calculations are verified by simulation and subsequent production of the first prototype. The basic measurements are performed on the prototype. Detected deficiencies of the prototype are removed in version 1.0. In order to achieve higher efficiency, innovated version 2.0 and version with GaN transistors are produced. The thesis is finished by comparing created buck converters.
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Calculation of Optimum Magnetic Flux of Induction Motor to Minimize Losses with Consideration of Temperature Influences
Toman, Marek ; Peroutka,, Zdeněk (referee) ; Rafajdus,, Pavol (referee) ; Vorel, Pavel (advisor)
This thesis deals with a calculation of optimum stator flux linkage of an induction motor in order to minimize losses at an arbitrarily chosen operating point over a wide range of speed and torque. An accurate identification of the parameters of the equivalent circuit is carried out in this work. The parameters of the equivalent circuit are considered to be not constant but dependent on the selected quantities. A thermal model of the machine is also created in the thesis which makes it possible to find out correct values of the stator winding resistance and rotor cage resistance in all calculations. A coupled model of the induction motor is subsequently developed using the improved equivalent circuit and the thermal model. This is a very accurate model of the machine that takes into account the interaction of electromagnetic and thermal processes in the machine. The coupled model forms then the basis of an algorithm for finding the optimum values of flux linkage. The values of the calculated optimal flux linkages are experimentally verified and a very good agreement between the theoretical calculations and experimental measurements is achieved.
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Step down DC/DC converter with high efficiency
Chudý, Andrej ; Cipín, Radoslav (referee) ; Procházka, Petr (advisor)
This bachelor's thesis deals with design and realization of several versions of DC/DC buck converter. The theoretical part of the bachelor's thesis is focused on the general analysis of DC/DC converters with a detailed description of the buck converters. Another part specializes in the analysis of the current state in this field, where the basic differences between the synchronous and diode rectifier are explained, electromagnetic interference and GaN transistors are described. Subsequently, the thesis involves the design and calculations of necessary parameters of the buck converter. Calculations are verified by simulation and subsequent production of the first prototype. The basic measurements are performed on the prototype. Detected deficiencies of the prototype are removed in version 1.0. In order to achieve higher efficiency, innovated version 2.0 and version with GaN transistors are produced. The thesis is finished by comparing created buck converters.
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