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    Wyświetlanie 1-8 z 8
    Tytuł:
    Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables
    Autorzy:
    Janke, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/140855.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power converters
    pulse width modulation (PWM)
    BUCK
    buck-boost
    BOOST
    averaged models
    Opis:
    The separation of variables approach to formulate the averaged models of DC-DC switch-mode power converters is presented in the paper. The proposed method is applied to basic converters such as BUCK, BOOST and BUCK-BOOST. The ideal converters or converters with parasitic resistances, working in CCM and in DCM mode are considered. The models are presented in the form of equation systems for large signal, steady-state and small-signal case. It is shown, that the models obtained by separation of variables approach differ in some situations from standard models based on switch averaging method.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 633-654
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Averaged models of pulse-modulated DC-DC power converters. Part I. Discussion of standard methods
    Autorzy:
    Janke, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/140859.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power converters
    pulse width modulation (PWM)
    BUCK
    BOOST
    buck-boost
    averaged models
    Opis:
    The averaged models of switch-mode DC-DC power converters are discussed. Two methods of averaged model derivation are considered - the first, based on statespace averaging and the second, on the switch averaging approach. The simplest converters: BUCK, BOOST and BUCK-BOOST working in CCM (continuous conduction mode) or DCM are taken as examples in detailed considerations. Apart from the ideal converters, the more realistic case of converters with parasitic resistances is analyzed. The switch averaging approach is used more frequently than the other and is believed to be more convenient in practical applications. It is shown however, that in the deriving the averaged models based on the switch-averaging approach, some informalities have been made, which may be the source of errors in the case of converters with parasitic resistances, or working in DCM mode.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 609-631
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Powiązania:
    https://bibliotekanauki.pl/articles/1844528.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    buck-boost
    synchronous dc-dc converters
    GaN
    high efficiency
    ultracapacitor
    power losses
    SEPIC
    Ćuk
    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.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 337-343
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Powiązania:
    https://bibliotekanauki.pl/articles/141117.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    boost
    buck
    CCM
    DC–DC converters
    flyback
    input characteristics
    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.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 739-750
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Powiązania:
    https://bibliotekanauki.pl/articles/949887.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    boost
    buck
    DC–DC converters
    DCM
    flyback
    input characteristics
    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.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 4; 801-813
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equivalent circuits for averaged description of DC-DC switch-mode power converters based on separation of variables approach
    Autorzy:
    Janke, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200524.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    switch-mode power converter
    BUCK
    BOOST
    averaged models
    equivalent circuits
    Opis:
    Large-signal and small-signal averaged models of basic switch-mode DC-DC power converters: BUCK (step-down) and BOOST (step-up) are presented. Models are derived with the separation of variables approach and have the form of equivalent circuits, suitable for a circuit simulation. Apart from equivalent circuits, small-signal transmittances of converters for CCM and DCM modes are discussed. Parasitic resistances of all components of converters are taken into account. A few examples of simulations and measurement results of selected converter characteristics are also presented. It is shown, that neglecting parasitic resistances (often met in works of other authors) may lead to serious errors in an averaged description of converters.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 711-723
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Small-signal input characteristics of step-down and step-up converters in various conduction modes
    Autorzy:
    Janke, W.
    Walczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200514.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulse converter
    BUCK
    BOOST
    small-signal models
    input characteristics
    przetwornica impulsowa
    charakterystyki wejściowe
    Opis:
    Small-signal input characteristics of BUCK and BOOST DC-DC power converters in continuous conduction and discontinuous conduction mode have been presented. Special attention is paid to characteristics in discontinuous conduction mode. The input characteristics are derived from the general form of averaged models of converters. The frequency dependence of input admittance and other input characteristics has been observed in a relatively low-frequency range. The analytical formulas derived in the paper are illustrated by numerical calculations and verified by experiments with a laboratory model of BOOST converter. A satisfying level of conformity of calculations and measurements has been obtained.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 2; 265-270
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of output conductance on characteristic frequencies of switch mode BUCK and BOOST converter
    Autorzy:
    Janke, W.
    Walczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140387.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulse converters
    BUCK
    BOOST
    small-signal models
    control-to-output
    characteristics
    DCM boundary
    characteristic frequencies
    Opis:
    Characteristic frequencies corresponding to poles and zeros of small-signal control-to-output transfer functions of popular DC-DC converters (BUCK and BOOST) are analyzed. The main attention is paid to influence of load conductance on the characteristic frequencies for converters working in continuous conduction mode (CCM) as well as in discontinuous conduction mode (DCM). Parasitic resistances of all converter components are included in calculations. In addition the improved description of CCMDCM boundary is presented. The calculations are verified experimentally and good consistency of the results is observed.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 165-178
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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