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Modified input-to-output and control-to-output transfer functions of a non-ideal buck converter working in discontinuous conduction mode

100%

Walczak M.

Archives of Electrical Engineering

2024

tom Vol. 73, nr 4

1025--1045

Small-signal models of a buck converter working in the discontinuous conduction mode that are available in the literature usually can be divided into those which contain a single pole and refer to non-ideal converters and those that describe ideal converters and contain two poles. Even though the models are noticeably different they have been validated through simulations and measurements, which suggests both of them are correct. The purpose of this paper is to provide a comprehensive comparison of the existing models with transient simulations done in OrCAD software and through measurements, to show that both of the mentioned models are true for a specific set of converter parameters, and to propose a two-pole, control-to-output and input-to-output transfer functions of a non-ideal buck converter, that can be used in any buck converter working in discontinuous conduction mode.

Influence of output conductance on characteristic frequencies of switch mode BUCK and BOOST converter

72%

Janke W. , Walczak M.

Archives of Electrical Engineering

2017

tom Vol. 66, nr 1

165--178

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.

Modified small-signal models of BUCK, BOOST and BUCK-BOOST DC-DC converters

58%

Walczak M.

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej

2015

tom Nr 8

39--52

Various models of DC-DC converters have been presented in many references. This paper provides extended version of a common transfer functions (line-tooutput, control-to-output) of three most popular DC-DC converters BUCK, BOOST and BUCK-BOOST. The extension includes all parasitic resistances and additional voltage source created after linearization of diode characteristic.

W dostępnej literaturze istnieje wiele modeli przetwornic napięcia stałego. Modele te różnią się między innymi rodzajem uwzględnianych rezystancji pasożytniczych. Niniejszy artykuł zawiera modele przetwornic napięcia stałego BUCK, BOOST oraz BUCK-BOOST, wyprowadzone przy pomocy techniki separacji zmiennych. Modele te uwzględniają zarówno rezystancje pasożytnicze wszystkich elementów przetwornicy jak i dodatkowe źródło napięcia powstałe po linearyzacji charakterystyki diody.