Design of Power Transformer with Frequency 1 Khz Franko, Marek; Kučera, Roman; Biel, Zdeno ...
Komunikácie : vedecké listy Žilinskej univerzity = Communications : scientific letters of the University of Žilina,
7/2023, Letnik:
25, Številka:
3
Journal Article
Odprti dostop
This paper deals with the noise level of power transformers operating at a middle frequency from 800 Hz to 2000 Hz. The factors that influence the noise produced by power transformers are size, ...design and operating conditions. The research shows that the noise level of power transformers can vary widely depending on these factors. The paper discusses an overview of different types of power transformers core and their impact on the transformer's noise performance. This paper describes the design of a middle-frequency power transformer, its material composition and the design of the magnetic circuit and windings, operating in the frequency range 800 to 2000 Hz, with a capacity of 200 kVA, air-cooled, to be fed from a suitable frequency converter, characterized by reduced noise. The proposed solution allows implementation of galvanically isolated DC-DC converters for auxiliary traction drives and other DC-DC converters.
In this paper, there is presented the digital control of input impedance for high voltage converter. Paper include measurement and evaluation of input impedance performed on auxiliary converter to ...UIC code 550-2 OR 1 st edition and UIC550-3 O, 1 st edition standards. The proposed control scheme is created for maximization input impedance for every frequency of injected input voltage.
Node Ringing Reduction of Synchronous Buck Converter Frivaldský, Michal; Pčola, Marcel; Biel, Zdeno ...
Komunikácie : vedecké listy Žilinskej univerzity = Communications : scientific letters of the University of Žilina,
7/2023, Letnik:
25, Številka:
3
Journal Article
Odprti dostop
This paper discusses the issue related to the switching regulators operated at high switching frequencies, where it is necessary to eliminate the influence of parasitic components of the converter's ...main circuit. In more detail it deals with the node-ringing phenomena, which is typical for synchronous buck converters. The existence of the parasitic inductances arising from the printed circuit board conductive paths, induce voltages, which are several times higher than nominal input voltage, thus it increases the risk of damage of the power transistors. Therefore, optimization of the circuit is required to reduce the voltage spikes and therefore improve safety margin related to nominal operation. In this paper, node-ringing phenomena is introduced, while the optimization methodologies for its reduction are described and verified by experimental analysis.
