Temat: DC/DC converters - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Output characteristics of step-down (Buck) power converter
Autorzy:: Janke, W.
Bączek, M.
Walczak, M.
Tematy:: DC-DC converters
output characteristics
load transients; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201669.pdf Link otwiera się w nowym oknie
Opis:: The output characteristics of switched-mode dc-dc buck power converter are discussed. The shape of output characteristics is especially important for converters used for supplying modern processors. An output impedance is usually used for description of output characteristics. Many efforts are described in the literature to obtain the satisfastory features of closed-loop output impedance. Another approach, presented in the paper, is based on the concept of the output voltage response corresponding to the load conductance change, and is expressed by hr transmittance. Simulations of output characteristics of the buck converter in frequency and in time-domain have been performed for the ideal case as well as for a more realistic situation, with the parasitic resistances of converter elements included. The measurement results differ substantially from characteristics calculated for an ideal converter and are in good consistency with simulations including parasitics.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Methods of DC/DC converter transfer function measurements, based on data acquired in the time domain
Autorzy:: Walczak, Marcin
Tematy:: DC–DC converters
frequency characteristics
transfer function measurement; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220796.pdf Link otwiera się w nowym oknie
Opis:: The measurement of frequency characteristics, like magnitude and phase, related to a specific transfer function of DC–DC converters, can be a difficult task - especially when the measured signal approaches the boundary of a small-signal model validity (i.e. 1/3 of the switching frequency f_S ). It is hard to find a paper where authors mention the measurement techniques they use to draw frequency characteristics. Meanwhile the presence of noise in the output signal does not enable to directly measure the gain and the phase shift between the input and output signals. In such situations additional analysis is required in order to achieve a reliable result. This paper contains a description of a few methods that can be used to analyse measured signals in order to determine the gain and the phase shift of a specific transfer function. They enable to verify mathematical models in a wide range of frequencies (up to 1/3 f_S ). The methods use signals measured in the time domain and can be implemented in mathematical software such as Matlab or Scilab.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Boosting resonant switched-capacitor voltage tripler
Autorzy:: Chojowski, Maciej
Sosnowski, Robert
Baszyński, Marcin
Tematy:: boost topology
DC–DC converters
switched capacitor converter; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/24202737.pdf Link otwiera się w nowym oknie
Opis:: This elaboration presents the concept of a unidirectional DC–DC switchedcapacitor converter operating as a voltage tripler. The system consists of two resonant cells with switched capacitors and chokes. This proposed converter topology achieves low voltages on semiconductor switches (diodes and transistors) compared to the classic SC series-parallel converter or the boost topology. The output voltage on the capacitors is reduced in the proposed converter because it is divided into two series-connected capacitors with asymmetric distribution. The presented results describe the analytical description of the system operation and the analytical equation for semiconductor currents. A simulation and experimental results have been performed. The system efficiency and three voltage gain values were measured in the experimental setup. The efficiency measured was also compared with the analytical determination curve for loss analysis and further converter optimization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simulation of high-efficiency interleaved step-up DC-DC boost-flyback converter to use in photovoltaic system
Autorzy:: Tomaszuk, A.
Tematy:: step-up DC-DC converters
high efficiency
photovoltaic systems; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/378212.pdf Link otwiera się w nowym oknie
Opis:: In low-voltage photovoltaic (PV) systems high-efficiency high voltage gain step-up DC-DC converters are required as the interface between the PV panel and the load. Therefore overall performance of the PV system is essentially affected by the efficiency of step-up DC-DC converter itself. This paper presents the results of PSpice simulation of high-efficiency interleaved step-up DC-DC converter. The converter integrates boost and flyback topologies. Interleaved approach minimizes the current stress on the switches as well as allows reducing a sizes of the inductors but also decreases input current ripples. The other advantage of interleaving structure is flexibility of number of working phases extension. The number of working phases can be dynamically determined depending on the power requirements of the load. High efficiency assured by boost-flyback topology is achieved by the means of recycling the energy from input leakage inductance and relatively low voltage stress across the transistor switches which enables low drain-to-source resistance transistors application. The simulation carried out will present transient and performance characteristics of interleaved step-up DC-DC boost-flyback converter.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Large-signal input characteristics of selected DC–DC switching converters. Part I. Continuous conduction mode
Autorzy:: Janke, Włodzimierz
Bączek, Maciej
Kraśniewski, Jarosław
Walczak, Marcin
Tematy:: boost
buck
CCM
DC–DC converters
flyback
input characteristics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141117.pdf Link otwiera się w nowym oknie
Opis:: Large-signal input characteristics of three DC–DC converter types: buck, boost and flyback working in the continuous conduction mode (CCM), obtained by simulations and measurements are investigated. The results of investigations are presented in the form of the analytical formulas and the exemplary results of the measurements and two forms of simulations: based on the full description of the converter components and on the averaged models. The parasitic resistances of the converter components are included in the simulations and their influence on the simulation results is discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Large-signal input characteristics of selected DC–DC switching converters, Part II. Discontinuous conduction mode
Autorzy:: Janke, Włodzimierz
Bączek, Maciej
Kraśniewski, Jarosław
Walczak, Marcin
Tematy:: boost
buck
DC–DC converters
DCM
flyback
input characteristics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/949887.pdf Link otwiera się w nowym oknie
Opis:: Large-signal input characteristics of three DC–DC converter types: buck, boost and flyback working in the discontinuous conduction mode (DCM), obtained by precise large signal PSpice simulations, calculations based on averaged models and measurements are presented. The parasitic resistances of the converter components are included in the simulations. The specific features of the input characteristics in the DCM and the differences between the continuous conduction mode (CCM) and DCM are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Small-signal transmittances of the non-ideal flyback switch-mode DC–DC converter
Autorzy:: Bączek, Maciej
Janke, Włodzimierz
Kraśniewski, Jarosław
Tematy:: continuous conduction mode
CCM
DC–DC converters
flyback
small-signal
transmittance; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111814.pdf Link otwiera się w nowym oknie
Opis:: Small-signal transmittances of the power stage of a flyback converter in continuous conduction mode are derived on the averaged model obtained by the separation of variables approach. The precise knowledge of these transmittances is necessary in the design process of the converter control circuit. Apart from mathematical formulas for transmittances, the numerical calculations of the frequency dependencies of the transmittances for the assumed set of the converter parameters are presented with the parasitic resistances of components taken into account. The results of the calculations are compared with the measurements performed on the laboratory model of the converter and a good consistency is observed. It is concluded, that the results of the paper may be useful in the designing process of a control circuit of the flyback converter.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Review and comparison of high efficiency high power boost DC/DC converters for photovoltaic applications
Autorzy:: Dawidziuk, J.
Tematy:: boost DC/DC converters
high efficiency
high power
photovoltaic systems
renewable energy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200077.pdf Link otwiera się w nowym oknie
Opis:: Recent environmental issues have accelerated the use of more efficient and energy saving technologies in renewable energy systems. High power high efficiency boost DC/DC converters for the use in photovoltaic, fuel cell systems are discussed in this paper from the viewpoint of power losses and efficiency. State of the art converters with switching frequency within the range of 25 kHz with IGBTs to 100 kHz with power MOSFETs and the highest efficiency close to 98%, depending on the load conditions, is considered. A comparison and discussion of the highest efficiency high power DC/DC boost converters is also presented in this paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dwukierunkowa przetwornica DC/DC z wykorzystaniem elementów SiC
Bidirectional DC/DC converter built with the use of SiC elements
Autorzy:: Matelski, W.
Wolski, L.
Abramik, S.
Tematy:: przekształtniki DC/DC
magazynowanie energii
półprzewodniki SiC
mikrosieci
DC/DC converters
energy storage
SiC semiconductors
microgrids; Pokaż więcej
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Powiązania:: https://bibliotekanauki.pl/articles/408732.pdf Link otwiera się w nowym oknie
Opis:: W artykule opisane zostały prace nad rozwojem przetwornicy o wysokiej częstotliwości łączeń z wykorzystaniem półprzewodników z węglika krzemu. Układ przystosowano do współpracy z magazynem energii, będącym częścią mikrosieci prądu stałego zawierającej źródła OZE. Przedstawiona została budowa urządzenia oraz działanie opracowanego algorytmu sterowania. W pracy zawarto wyniki badań eksperymentalnych przetwornicy o częstotliwości łączeń 500 kHz, współpracującej z superkondensatorowym zasobnikiem energii.
The article presents development process of the high frequency DC/DC converter built on the basis of silicon carbide elements. The device has been designed for energy storage applications, as a part of a DC microgrid with renewable energy sources. The structure and basics of the proposed control algorithm of the converter have been presented. The work contains the results of experimental tests of the converter operating with 500 kHz switching frequency in application with a supercapacitor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Design, Analysis and Comparison of Si- and GaN-Based DC-DC Wide-Input-Voltage-Range Buck-Boost Converters
Autorzy:: Koszel, Mikołaj
Grzejszczak, Piotr
Nowatkiewicz, Bartosz
Wolski, Kornel
Tematy:: buck-boost
synchronous dc-dc converters
GaN
high efficiency
ultracapacitor
power losses
SEPIC
Ćuk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1844528.pdf Link otwiera się w nowym oknie
Opis:: The purpose of the article is a comparison between DC/DC topologies with a wide input voltage range. The research also explains how the implementation of GaN E-HEMT transistors influences the overall efficiency of the converter. The article presents a process of selection of the most efficient topology for stabilization of the battery storage voltage (9 V – 36 V) at the level of 24 V, which enables the usage of ultracapacitor energy storage in a wide range of applications, e.g., in automated electric vehicles. In order to choose the most suitable topology, simulation and laboratory research were conducted. The two most promising topologies were selected for verification in the experimental model. Each of the converters was constructed in two versions: with Si and with GaN E-HEMT transistors. The paper presents experimental research results that consist of precise power loss measurements and thermal analysis. The performance with an increased switching frequency of converters was also examined.
Dostawca treści:: Biblioteka Nauki

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