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Content available Small-signal transmittances of the non-ideal flyback switch-mode DC–DC converter
Bączek Maciej, Janke Włodzimierz, Kraśniewski Jarosław
Archives of Electrical Engineering
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2024
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Vol. 73, nr 1
1--15
EN
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.
2
Content available Large-signal input characteristics of selected DC–DC switching converters. Part I. Continuous conduction mode
Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław, Walczak Marcin
Archives of Electrical Engineering
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2020
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Vol. 69, nr 3
739--750
EN
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.
3
Content available Large-signal input characteristics of selected DC–DC switching converters, Part II. Discontinuous conduction mode
Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław, Walczak Marcin
Archives of Electrical Engineering
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2020
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Vol. 69, nr 4
801--813
EN
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.
4
Content available Averaged model of a buck DC–DC converter for single-loop description of current-mode control
Janke Włodzimierz, Bączek Maciej, Kraśniewski Jarosław
Archives of Electrical Engineering
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2019
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Vol. 68, nr 4
891--905
EN
: Averaged models: an AC large signal, DC and AC small signals of a currentcontrolled buck converter are described. Only peak current mode control of a converter working in the continuous conduction mode (CCM) is considered. The model derivation differs from the typical approaches presented in the literature and doesn’t refer to the multiloop concept of a current controlled converter. The separation of the variables method is used in the model derivation. The resulting models are presented in the form of an equation set and equivalent circuits. The calculations based on the presented models are verified by measurements and full-wave PSpice simulations.
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