National Repository of Grey Literature 13 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
DC-DC converter for onboard charging of electric vehicles
Holub, Miroslav ; Červinka, Dalibor (referee) ; Folprecht, Martin (advisor)
This master thesis deals with design of DC-DC converter for onboard charging of electric vehicle. Developed converter will mainly be used for charging stationary traction battery in laboratory. Output voltage of this charger will be adjustable by user in between 200 V and 450 V depending on the current charged battery configuration. Output current limit is set at 8 A. Since the converter will be supplied from standard household socket, the problem of power factor correction must be solved during the design. That is because a large part of this thesis is focused on describing the problematics of power factor correction. After that, active PFC module is designed, completed and performance of this module is verified. To achieve low overall losses and thus be able to keep small volume of the system, modern switching components based on Silicon Carbide were preferred. Beside laboratory use, completed system will be used to emphasize volumetric difference between onboard chargers based on old versus modern switching components.
Inverter for single-phase island network
Klčo, Michal ; Folprecht, Martin (referee) ; Procházka, Petr (advisor)
The thesis deals with a design and construction of voltage converter from 12 V DC to 230 V AC with frequency 50 Hz. Maximum output power of this device is 250 W. As a control circuit has been used IC TL494CN. The device includes undervoltage protection, which is applied if the voltage of the supply battery drops and protection against battery overcharging by solar panel. It also develops a proposal for integration the inverter into the island power system.
Full bridge DC-DC converter with transformer
Boháček, Daniel ; Vorel, Pavel (referee) ; Folprecht, Martin (advisor)
This semestral thesis deals with the issue of full bridge DC-DC convecter with transformer. The aim of this semestral thesis is the design, construct and verification of functionality convecters, which will be used as laboratory tool.
Battery-powered welding inverter
Starec, Stanislav ; Folprecht, Martin (referee) ; Vorel, Pavel (advisor)
This semester’s paper is focused on proposition and following implementation of DC arc welder. This paper is based on master thesis, where the first version was realized. The welder is powered by a battery pack with LiFePO4 type cells. Battery cells are protected by BMS circuits. The driving electronics controls the duty cycle step-down (buck) converter in a closed current or power regulation loop. The power regulator has been designed and validated by simulations. Switching power transistors, low side and high side, are implemented by optically isolated gate drivers. Charging the battery is solved by a switching flyback converter. For the charger and the welder is sheet metal construction made of aluminum sheet.
Low Power High Voltage Step-Down Converter
Folprecht, Martin
This article refers about problematics of DC/DC converters. Basic topologies of DC/DC converters with and without pulse transformer are mentioned in this article. There is also a focus on some IC drivers and controllers used for converters without pulse transformer. The main part of the article is reserved for the description of the step-down converter powered from voltage in excess of 100 V, which is able to work in application, where special IC controller cannot be used.
Electromagnetic power actuators
Kadlecová, Lucie ; Vorel, Pavel (referee) ; Folprecht, Martin (advisor)
This master thesis focuses on literature research of problematics linked to power actuators working on electromagnetic principle to accelerate metal projectiles. It’s goal is mathematical analysis and constuction of selected type of electromagntic power actuator – induction coilgun
Push-pull converter powered from board network
Kudláček, Pavel ; Knobloch, Jan (referee) ; Folprecht, Martin (advisor)
The thesis deals with a theoretical design of push-pull converter for use in a car. In the thesis is described calculation of impulse transformator, output choke, thermal and voltage design of used semiconductor components, solution propose of control and regulation circuits, practical realization of converter and verification of its properties.
Electronic equipment for high-power flash light
Fritsch, Karel ; Folprecht, Martin (referee) ; Knobloch, Jan (advisor)
Point of this thesis is introduction to topology of small power switching power supplies and final application of gained knowledge during development of converter for charging capacitor battery of high power photographic flash. Thesis also contains design of control unit with microcontroller and description of work process of activation individual function blocks.
Power supply for galvanic treatment of metal surfaces
Botek, Lukáš ; Folprecht, Martin (referee) ; Knobloch, Jan (advisor)
This thesis discusses the realization of the switched-mode power supply, designed to a DC power electroplating bath for anodic oxidation of titanium. It deals with the design and realization of its individual parts. It also contains a summary of the basic methods of electroplating surfacing.
Switch mode supply
Folprecht, Martin ; Martiš, Jan (referee) ; Patočka, Miroslav (advisor)
This master´s thesis describes switch mode power supply. The aim of this master´s thesis is the design and the construction of the switch mode power supply, which will be used as a laboratory tool.

National Repository of Grey Literature : 13 records found   1 - 10next  jump to record:
See also: similar author names
1 Folprecht, Marek
2 Folprecht, Michal
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