PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników
Powiadomienia systemowe
  • Sesja wygasła!

Znaleziono wyników: 6

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  step-down converter
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Characteristic frequencies in averaged description of step-down (BUCK) DC-DC power converter
Janke W.
Archives of Electrical Engineering
|
2016
|
Vol. 65, nr 4
703--717
EN
In the description of small-signal transmittances of switch-mode power converters several characteristic frequencies are usually used, corresponding to poles and zeros of transmittances. The knowledge of these frequencies is important in the design of control circuits for converters and usually are assumed to be constant for a given power stage of a converter. The aim of the paper is to evaluate the influence of converter primary parameters and load conductance on characteristic frequencies. Analytical derivations and numerical calculations are performed for an ideal and non-ideal BUCK converter working in continuous or discontinuous conduction mode.
2
Content available remote Szacowanie strat mocy w impulsowej przetwornicy obniżającej napięcie
Janke W., Bączek M.
Przegląd Elektrotechniczny
|
2015
|
R. 91, nr 10
237-240
PL
Scharakteryzowano problemy związane z określeniem strat mocy w impulsowych przetwornicach napięcia stałego. Zaproponowano sposób obliczeń strat mocy w przetwornicy BUCK w trybach ciągłego i nieciągłego przewodzenia. Rozważania ogólne zilustrowano wynikami obliczeń i pomiarów przeprowadzonych w modelu laboratoryjnym przetwornicy BUCK.
EN
The problems of estimation of power loss in switching power converters are outlined. New formulas for calculation of power losses in stepdown (BUCK) converter working in the continuous conduction mode and discontinuous conduction mode are derived. The exemplary calculations and measurements of power losses in laboratory model of BUCK converter are performed and good consistency of results is observed.
3
Content available Small-signal transmittances of DC-DC step-down PWM converter in various operation modes
Janke W.
Archives of Electrical Engineering
|
2015
|
Vol. 64, nr 3
505--529
EN
Small-signal transmittances: input-to-output and control-to-output of BUCK converter power stage working in CCM or DCM mode are discussed. Ideal converter case and converter with parasitic resistances are considered separately. Derivations of small-signal transmittances, based on different approaches to finding the converter averaged models, are presented and the results are compared. Apart from theoretical considerations, some results of numerical calculations are presented.
4
Content available Comparision of Buck-Converter parameters quality depending on coil selection
Pragłowska-Ryłko N.
Acta Innovations
|
2015
|
no. 17
22--29
EN
Buck-Converters belong to DC/DC converters group. One of the main problems during the design stage of DC/DC converter is the proper component selection. The aim of this article is to describe selection of the optimal inductor for the Buck-Converter, enabling to minimize the device output overvoltage, while getting possibly high device efficiency. In order to verify the quality parameters, author made an efficiency comparison of the buck converter, depending on used inductor. Conclusions from this paper allow for optimal selection of coils for the Buck-Converter depending on given criteria.
5
Content available Comparison of transient states in step-down power converter (BUCK) in continuous and discontinuous conduction mode
Janke W., Walczak M.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2014
|
Vol. 62, nr 4
773--778
EN
The object of this paper is a step-down (BUCK) power converter working in the continuous conduction mode (CCM) or discontinuous conduction mode (DCM). Two types of transient states in a converter have been analyzed and observed experimentally: slow transients, described by averaged models of a converter and fast transients, in the course of a single switching period. The averaged models of converter working in CCM, presented in various sources are similar, with some differences concerning only the description of parasitic effects. The averaged models for DCM depend on the adopted modeling method. Models obtained by the switch averaging approach are second-order models (containing two reactive elements in equivalent circuit representation). Models obtained by the separation of variables approach are first-order models. The experimental results given in this paper show the first-order type of transients. Another group of experiments concern fast transients in the course of a single switching period. The oscillations of inductor voltage in the part of a switching period are observed for DCM.
6
Content available remote Selection of components for photovoltaic system
Dobrzański L.A., Drygała A., Prokopiuk vel Prokopowicz M.
Archives of Materials Science and Engineering
|
2013
|
Vol. 62, nr 2
53--59
EN
Purpose: The aim of the paper is to determinate basic parameters for components of demonstrative system which is traffic light pedestrian crossing. Design/methodology/approach: Photovoltaic module was produced from monocrystalline silicon solar cells which were joined in series. Photovoltaic system consists of solar module, astable generator, step-down converter and battery pack. Findings: It`s necessary to protect photovoltaic system from external factor like unstable light conditions, variable input voltage, shading. Taking this fact into account photovoltaic system with step-down converter was designed. Step-down converter adjust the voltage of photovoltaic module to the voltage of battery protecting them from overcharging and discharging. Research limitations/implications: The main goal of this work is to show the practical use of widely available, renewable energy source, which is the Sun through the selection of component for the demonstrative photovoltaic system -traffic light pedestrian crossing. Practical implications: In order to provide access to electricity in areas with limited access to power network, there irreplaceable are stand-alone photovoltaic systems, which can supply both AC and DC devices. Originality/value: The produced photovoltaic system confirms the usefulness of solar energy in every place where sunlight is available. In order to provide steady supply at night and in low sunlight the battery stores energy was applied.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.