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Optimization of the switching power supplies with synchronous rectifier
Skácel, Josef ; Macháň, Ladislav (referee) ; Žák, Jaromír (advisor)
This thesis deals with switching circuit topic, especially switching power supplies. There are switching circuits without inductance and their benefits presented in the thesis. Basic topologies of switching power supplies, their properties, application area and functions of basic types of converters are also described. The next section focuses on special resonant switching power supplies and synchronous. The main part of the work is carried out simulations using three synchronous rectifiers. The work includes practical design of an SMPS with synchronous rectifier.
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Miniature high efficiency DC/DC boost converter
Miko, Radoslav ; Vašíček, Adam (referee) ; Červinka, Dalibor (advisor)
Bachelor thesis deals with design and implementation of the DC/DC converters for charging notebook in cars. Variant 1 with parameters 9 – 18 V/19 V – 5 A is designed for 12 V system, typical for cars. Variant 2 introduce wide input range DC/DC converter with parameters 9 – 32 V/19 V – 5 A designed for using in 12 – 24 V system, thus usable in car or truck. It is also possible to use the converter in the supply system of small personal airplanes or in army supply systems which corresponds to the input voltage range. The main requirements are minimal size of converters, high mechanical durability for hard condition of operation and maximal efficiency with using a synchronous rectifier.
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Optimization of the switching power supplies with synchronous rectifier
Skácel, Josef ; Macháň, Ladislav (referee) ; Žák, Jaromír (advisor)
This thesis deals with switching circuit topic, especially switching power supplies. There are switching circuits without inductance and their benefits presented in the thesis. Basic topologies of switching power supplies, their properties, application area and functions of basic types of converters are also described. The next section focuses on special resonant switching power supplies and synchronous. The main part of the work is carried out simulations using three synchronous rectifiers. The work includes practical design of an SMPS with synchronous rectifier.
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Laboratory DC power supply 30V 60A
Gábel, Marián ; Vorel, Pavel (referee) ; Martiš, Jan (advisor)
The master thesis deals with design of a switched DC power supply with output parameters of 30 V 60 A. The power supply uses the connection of two single switch forward converters with opposite phase. The topology was chosen based on a comparison of specific schematics in the first part. The body of the thesis is covered in chapter which deals with design and analysis of power circuits of the converter. The chapter describes detailed design of pulse transformers, dimensioning of semiconductors and cooling system of the converter. For lower power losses, the system of synchronous rectifying is chosen at the output of the circuit. The regulation of the output is based on cascade structure with a superior voltage and dependent current loop. Appropriate over current protection is provided by sensing the output current and using current transformers for primary current measure.
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DC/DC converters for industrial power supplies
Chudý, Andrej ; Cipín, Radoslav (referee) ; Procházka, Petr (advisor)
This diploma thesis deals with design and comparison of selected DC/DC converters, where the better of them is practically realized. The first part of the diploma thesis is focused on the general analysis of DC/DC power converters. The following part is theoretical analysis focused on the first selected topology – step-up converter. The second analysed topology is forward converter with full bridge on the primary side. The theoretical analysis also includes a description of synchronous rectifier, the differences between hard and soft switching, and the types of secondary rectifiers. Another part specializes in the detailed calculation of main components of selected converters and their subsequent power dimensioning. Both designed topologies are compared according to the required aspects. The selected better topology is supplemented by the design of control circuits and an auxiliary power supply. Practical realization of converter and commissioning follows. The diploma thesis ends with verification measurements on the realized converter and their subsequent analysis.
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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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DC/DC converter 2,5kW/1500A for resistive heating of iron components
Martiš, Jan ; Knobloch, Jan (referee) ; Vorel, Pavel (advisor)
This thesis deals with the design and construction of a single-phase switching power supply, which is intended for direct resistive heating of iron components. The power supply is especially intended for resistive heating of horse-shoes. The supply is able to deliver an output current of up to 1500 A at a power of up to 2500 W. The first part of this work deals with the design of individual parts of the unit, the second part is focused on construction and testing of the supply and the last part contains technical documentation. The power supply was successfully tested and the required output parameters were met. However some problems do exist, especially with overheating of the output rectifier and with contacting the heated component to the output leads of the supply. These problems will be discussed in the work. The power supply can be used as an alternative solution to classic means of iron heating. The methods and ideas presented in this work can be applied in a design of a similar power supply with high output current, but most of the design rules are valid generally for the given topology.
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A Design And Development Of A Universal Power Supply For Laptops In Motor Vehicles
Cagáň, Adam
This thesis deals with design of DC power supply with adjustable output voltage, workingin buck-boost topology. Thesis explains selection of buck-boost controller integradet circuit and calculationof values of external components. Designed converter is simulated in LTspice software,where parasitic properties of used components are included. There are summarized parameters ofconverter in different working states. Further there are mentioned planned expansions of converter,including microcontroler integration with user interface.
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DC/DC converters for industrial power supplies
Chudý, Andrej ; Cipín, Radoslav (referee) ; Procházka, Petr (advisor)
This diploma thesis deals with design and comparison of selected DC/DC converters, where the better of them is practically realized. The first part of the diploma thesis is focused on the general analysis of DC/DC power converters. The following part is theoretical analysis focused on the first selected topology – step-up converter. The second analysed topology is forward converter with full bridge on the primary side. The theoretical analysis also includes a description of synchronous rectifier, the differences between hard and soft switching, and the types of secondary rectifiers. Another part specializes in the detailed calculation of main components of selected converters and their subsequent power dimensioning. Both designed topologies are compared according to the required aspects. The selected better topology is supplemented by the design of control circuits and an auxiliary power supply. Practical realization of converter and commissioning follows. The diploma thesis ends with verification measurements on the realized converter and their subsequent analysis.
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Laboratory DC power supply 30V 60A
Gábel, Marián ; Vorel, Pavel (referee) ; Martiš, Jan (advisor)
The master thesis deals with design of a switched DC power supply with output parameters of 30 V 60 A. The power supply uses the connection of two single switch forward converters with opposite phase. The topology was chosen based on a comparison of specific schematics in the first part. The body of the thesis is covered in chapter which deals with design and analysis of power circuits of the converter. The chapter describes detailed design of pulse transformers, dimensioning of semiconductors and cooling system of the converter. For lower power losses, the system of synchronous rectifying is chosen at the output of the circuit. The regulation of the output is based on cascade structure with a superior voltage and dependent current loop. Appropriate over current protection is provided by sensing the output current and using current transformers for primary current measure.
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