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Szacowanie strat mocy w impulsowej przetwornicy obniżającej napięcie

Janke W., Bączek M.

Przegląd Elektrotechniczny

2015

R. 91, nr 10

237-240

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.

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.

Comparision of Buck-Converter parameters quality depending on coil selection

Pragłowska-Ryłko N.

Acta Innovations

2015

no. 17

22--29

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.

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

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.