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Induction heater converter
Holcman, Marek ; Knobloch, Jan (referee) ; Martiš, Jan (advisor)
This thesis deals with the design of a power converter for induction heating of iron components designed for a power of at least 2.5 kW. The induction furnace forms a series resonant LC circuit. The thesis contains a description and a design of individual parts of the converter, including wiring diagrams and a design of printed circuit boards. At the end of the work are then described the mechanical construction, the course of recovery and testing the operation of the inverter.
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Electromagnetic levitation
Kondys, David ; Červinka, Dalibor (referee) ; Martiš, Jan (advisor)
The thesis deals with the issue of magnetic levitation. It is divided into two main chapters. The first chapter is focused on a general introduction to magnetic levitation. It describes the types of magnetic levitation, their use and the principle of execution. The end of the chapter is focused on a more detailed description of magnetically levitated MAGLEV trains. It describes the history of these trains, their use and construction. The second chapter is focused on the design of a device for demonstrating magnetic levitation. First, it deals with the simulation of an electromagnetic problem in the FEMM program. In addition, for the selected position configuration of the electromagnet and levitating magnet, it describes the design of the construction of the device in SOLIDWORKS and its manufacture. The result of the work is an attempt to make such a device that can stably keep the levitating magnet in the air.
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230 V inverter for isolated mains supplied from solar cells
Michálek, Pavel ; Procházka, Petr (referee) ; Martiš, Jan (advisor)
In this thesis is presented detail design of power part of DC/DC converter and output inverter. This device will serve for creating an artificial network in a family house where it will be used for supplying selected household appliances which are designed for use in AC network. The converter will be supplied with DC voltage. This tension will be obtained from a system of photovoltaic panels. The output voltage will have alternate character and it will be close to the network voltage 230 V/50 Hz. In the introductory part of thesis are discussed possible topologies of converters and output inverters. Subsequently are designed individual parts of supply inverter. In the final part there are shown waveforms of important values and is given a thesis evaluation.
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Switch mode supplies
Hladík, Jan ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This thesis deals with the design of switched power supply for laboratory lessons. Forward converter was chosen as the topology of this power supply. Output voltage is adjustable from 0 V to 32 V. Power supply is capable of output current up to 10 A and output has adjustable current limiting. Following parts were designed: LC filter, pulse transformer, bridge rectifier with capacitor, power MOS-FETs driver, closed loop control with its auxiliary power supply. Cascade closed loop control is used for controlling of designed power supply. Control is analogue, operation amplifiers were used for its construction. PCB was designed for the whole power supply. Power supply was sucessfully assembled and tested.
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Single-phase DC/AC converter with output parameters 230 V / 50 Hz / 100 VA
Smolák, Martin ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
This master‘s thesis focuses on optimization of power and control circuits of an inverter, which was developed at UVEE. The principle of function and circuit implementation of a single-phase inventer, various calculations (design of an LC filter, DC link capacitor, semiconductor elements and heat sink) are described in the thesis. A design of fast overcurrent protections, oscillator and saw signal generator is included. Furthermore, a printed circuit board was designed which was optimized by thermal simulation in the Workbench Ansys. Subsequently, the printed circuit board was mounted, debugged and verification measurements were performed on it. At the end of the thesis there is a documentation for the implemented equipment.
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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.
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Light sources in extreme operational conditions
Martiš, Jan ; Krbal, Michal (referee) ; Pavelka, Tomáš (advisor)
The purpose of this work is to inform about how various external influences can affect the operational characteristics of light sources. In the first part of the work, the light sources are categorized based on their principle of operation and the basic parameters and properties of different light source types are listed. Then the individual influences (voltage changes, temperature, operational position) and their possible effect on the operational characteristics of different types of light sources are analysed. Further, possible procedures for measuring light sources under altered conditions are mentioned and the results of practical measurements on selected light sources are presented. The last part of the work deals with ways to decrease the influence of altered operating conditions on the operation of light sources.
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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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MIG/MAG welder with switching power supply
Klejma, Michael ; Červinka, Dalibor (referee) ; Martiš, Jan (advisor)
This diploma thesis deals with design of welding power supply for MIG / MAG and MMA technique with continuous output current 120 A. The first, theoretical part is devoted to welding process technology, physical characteristics of electric arc and description of individual welding methods. The thesis also deals with the concept of power converter. The design of the switched-mode power supply is based on a full bridge topology. In order to implement advanced controls of welding power supply, the ARM Cortex M4 microprocessor was selected. Due to the large power consumption of the stepper motor for drive the welding wire, an auxiliary switched-mode power supply was also implemented. The documentation describing the realization of the welding power supply and the results of the measurements are in the last part of the thesis. The welding power supply was successfully revived and reached nominal parameters. Inert gas welding has not been tested yet, due to lack of time caused by extensive work in order to complete mechanical realization.
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Battery supplied lawn mower
Picmaus, Jan ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
The thesis deals with a concept of turning a conventional petrol powered lawn mower to a battery powered solution which is powered by lithium cells. A division to three chapters, comparison, mechanical and electrical, provides fluency of the whole design and further realization. The arrangement of chapters is performed so that the continuity of the thesis is maintained. Calculations of parameters of every motor and transmission with choosing particular devices are just a part of much interesting information which can be found in this thesis. All new components have full documentation except those which were changed during manufacturing. The electrical part explains every part of the schematics in detail. The realization contains difference between preliminary design and further production, manufacturing of the PCB and powering up the motor drives. The last part of the thesis contains temperature measurements of the device at no load.
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