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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.
EN
The main topic of the paper is the large signal averaged model of a switch-mode flyback power converter. The use of the large-signal averaged models of switching converters allows for fast simulation of power systems. The known averaged models of a flyback are based on the state-space averaging or switch-averaging approach. The model presented in the paper is derived with the use of the separation of variables approach and include parasitic resistances of all converter components. The limitations of the model accuracy are discussed. The calculations based on the averaged model are compared with detailed full-wave simulations and measurements results.
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.
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.
5
Content available remote Wpływ efektów pasożytniczych na wybrane właściwości przetwornicy Flyback
PL
W pracy omówiono główne cechy transformatorowego przekształtnika napięcia stałego Flyback oraz znaczenie efektów pasożytniczych w jego elementach. Wyprowadzono wzory opisujące czasowe przebiegi prądów w przekształtniku w pojedynczym okresie przełączania i na ich podstawie zależności między składowymi stałymi prądów i napięć w nieidealnym przekształtniku. Pokazano przebiegi otrzymane pomiarowo i symulacyjnie ilustrujące wpływ elementów pasożytniczych na oscylacje pojawiające się przy zmianach stanu przełączników.
EN
The Flyback converter is is the most popular example of the transformer-mode DC-DC power converter. In the standard description of Flyback the parasitic effects in its components are usually included to the very limited extent. In the paper, the influence of parasitic effects in each component of the converter is considered. The formulas describing the waveforms of currents during the single switching period of non-ideal converter are derived and used for finding the expressions for DC characteristics of the converter. The resulting expressions are verified experimentally. The influence of parasitic parameters of semiconductor switches on the vaveform of oscilations observed at transients are investigated by simulations and measurements.
PL
W artykule przedstawiono koncepcję analitycznej predykcji częstotliwości zaburzeń elektromagnetycznych generowanych w przekształtnikach energoelektronicznych. Analizę zaburzeń przeprowadzono na przykładzie wielotransformatorowej przetwornicy w topologii Flyback. Wyniki obliczeń zostały zweryfikowane z pomiarami laboratoryjnymi prototypu przetwornicy.
EN
In this paper an analytical concept of the ringing frequency prediction in power electronics converters was presented. Research of these interferences was carried out with multi–transformer Flyback converter. Results of the analytical calculations was compared with prototype measurements.
PL
W artykule przedstawiono konstrukcję izolowanego zasilacza o topologii flyback. Zmierzone parametry zasilacza zestawiono z normami opisującymi wymagania dla elektroenergetycznych urządzeń zabezpieczeniowych.
EN
The paper presents the design of an isolated flyback topology power supply. Measured parameters was compared with the norms requirements for power protection devices.
8
Content available remote Magnetic component design and switching technique in high efficiency flyback SMPS
EN
In the article analysis of energy losses in the flyback converter as function of transformer design and operating frequency is presented. An introduction of a resonant snubber circuit on the secondary side of the flyback transformer, combined with controlled switching time of the transistor is discussed.
PL
W artykule zaprezentowano analizę strat w zasilaczu w funkcji parametrów transformatora oraz częstotliwości pracy. Przedstawiono wpływ zastosowania tłumika rezonansowego w połączeniu z kontrolowanym czasem przełączania tranzystora kluczującego.
9
Content available remote A Single-stage LED Driver for The Street Lighting System
EN
A single-stage LED driver for the street lighting is proposed. The system consists of a constant current circuit and a constant voltage circuit, and the constant voltage circuit is gotten by integrating a buck-boost circuit and a flyback circuit.The peak current control mode is adopted in the constant current circuit which is a boost circuit and works in PWM mode. The theoretical analysis and design procedures of the proposed lighting system are proposed and discussed in detail in the paper.
PL
Opisano system świateł LED stosowanych do oświetlenia ulic. System składa się z przetwornicy buck-boost pracującej w trybie PWM.
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