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1
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.
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 Programowanie wielowątkowe w językach strukturalnych i obiektowych
Wiśniewski Mateusz Łukasz
Journal of Computer Sciences Institute
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2019
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Vol. 10
49--53
PL
W artykule przedstawiono sposoby programowania wielowątkowego w wybranych językach programowania takich jak: C podejście strukturalne oraz obiektowe C++ przy użyciu bibliotek Posix Threads dla języka C oraz bibliotekę Boost dla języka C++. Opisano również charakterystykę wybranych bibliotek. Przedstawiono przykładowe rozwiązania typowych problemów programistycznych wykorzystujących wątki. Starano odpowiedzieć na pytanie czym kierować się przy wyborze języka do nauki programowania wielowątkowego oraz programowania w ogólnym tego słowa znaczeniu.
EN
The article presents multithreaded programming in selected programming languages such as: C structural and C ++ object oriented approach using Posix Threads libraries for C language and Boost library for C ++ language. The characteristics of selected libraries are also described. Examples of typical programming problems using threads are presented. An effort was made to answer the question of what to do when choosing a language for learning multithread programming and programming in the general meaning of this word.
4
Content available Analiza porównawcza wybranych zagadnień programowania wymagających komunikacji międzyprocesowej i międzywątkowej
Wróbel Kamil
Journal of Computer Sciences Institute
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2019
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Vol. 11
149--154
PL
Poniższy artykuł przedstawia porównanie mechanizmów komunikacji i synchronizacji oferowanych w aplikacjach wielowątkowych oraz analogicznych rozwiązań opartych o komunikację międzyprocesową. Porównanie teoretyczne zestawiono z praktycznymi klasycznymi problemami synchronizacji. Porównano dostępność mechanizmów komunikacji i synchronizacji w bibliotece Boost i w komunikacji międzyprocesowej IPC. Przedstawiono subiektywną ocenę stopnia trudności implementacji i porównanie wydajności.
EN
The following article presents a comparison of multithread and multiprocess communication and synchronization. The theoretical comparison was supported by the solutions of practical, classical synchronization problems. The availability of communication and synchronization mechanisms in the Boost library and in IPC interprocess communication was compared.A subjective assessment of the difficulty in implementation and applications performance was also presented.
5
Content available Effects of combustion timing on pressure rise rates in a residual effected HCCI engine
Hunicz Jacek, Gęca Michał, Kordos Paweł, Rybak Arkadiusz
Combustion Engines
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2019
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R. 58, nr 3
46--50
EN
Realization of a low temperature combustion concept in homogeneous charge compression ignition (HCCI) engines is a cutting-edge technology that offers clean combustion in parallel with high thermal efficiency. Low combustion temperature prevents from NOx formation whereas homogeneous mixture assures smokeless exhaust. However, achieving the production feasibility by HCCI technology is hampered by high pressure rise rates and the resulting combustion noise at a high load operation. This paper explores combustion timing parameters that are capable of maintaining permissible levels of pressure rise rates under a high load regime. On the basis of experimental data collected at a high load HCCI operation, pressure rise level was correlated with combustion duration. Furthermore, combustion duration has been found to scale with in-cylinder volume, for which 50% of mass fraction burned appeared. The results showed quantitatively limitations of engine load, pointing out on required combustion timings to achieve acceptable combustion harshness depending on engine load.
6
Content available A multilevel switched capacitor DC-DC converter. An analysis of resonant operation conditions
Kawa A. H., Stala R.
Power Electronics and Drives
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2016
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Vol. 1 (36), No. 2
35--53
EN
This paper presents the research results of a multilevel switched capacitor DC-DC converter (MLSCC). The converter, for power electronic applications, can operate in ZCS mode by utilizing resonant circuits for recharging the switched capacitors. The main focus of this article is an in-depth original analysis of the waveforms and the converter voltage ratio. The concept of the converter is verified by simulation results of the circuit in MATLAB/Simulink Sim Power Systems. The formulas given in the mathematical analysis are evaluated for example parameters of the components with the use of numerical approach in MATLAB software. Plot sets are presented in order to judge the influence of the parameters on converter performance. All non-expected relations are explained based on mathematical analysis. The possibilities of the design optimization are identified and presented based on the anticipated results. The present analysis is important for the converter design process and can be used for numerical multi-object optimization to further improve the converter design.
7
Content available remote Classification and Comparison of BPFC Techniques: A Review
Chen Y., Dai W.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 2a
179--186
EN
Power factor correction (PFC) techniques play an important role in green power and energy-saving technology. Based on conventional boost PFC, many novel topologies and control strategies of bridgeless PFC(BPFC) have been proposed, and BPFC reduces the number of devices, the losses and improves the power density as well. In this paper, it discusses and investigates a variety of low conduction losses and high power factor performance of the BPFC topological structures and identifies their merits and limitations by comparing and analysing bridgeless boost PFC,bridgeless buck PFC ,bridgeless sepic PFC and Bridgeless cuk PFC. And the trends of bridgeless PFC techniques are analyzed in the meantime. For the selection, application, and the later structural optimization of Bridgeless PFC techniques which are used in the smart grid, distributed energy and green power and other equipments.
PL
W artykule przedstawiono omówienie badań nad bezmostkowym korektorem współczynnika mocy, mających na celu porównanie strat przewodzenia i skuteczności działania, dla różnych topologii układu. W pracy określono zalety i ograniczenia poszczególnych architektur oraz ich ewolucję. Porównano ich zastosowanie do sieci inteligentnych, energetyki rozproszonej i odnawialnej.
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