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Wyświetlanie 1-15 z 22
Tytuł:
Analysis of circuit and operation for DC–DC converter based on silicon carbide
Autorzy:
Niewiara, Ł. J.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/97287.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
SiC MOSFETS
high switching frequency
DC–DC converter design
snubber circuit
Opis:
In this paper operating analysis of DC–DC converter is presented. Silicon Carbide based DC–DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC–DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). Real power semiconductors are equipped in output and input capacitances. This feature may influence the generated input signal. Parasitic capacitances and inductances of the paths causes oscillations and voltage overshoots of the input PWM signal. To avoid such phenomenon, it is necessary to use a snubber circuit. This issue is also presented. The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 268-279
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of snubber circuit design for SiC power MOSFET devices
Autorzy:
Niewiara, Ł. J.
Skiwski, M.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/97236.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
snubber circuit
SiC MOSFET
Opis:
In this paper a design process of snubber circuit for DC\DC converter is presented. Computer simulation and experimental tests were carried out. Due to the presence of parasitic LC (inductance and capacitance) circuit in the power stage, it is necessary to use an additional snubber circuit for voltage overshoot and oscillations reduction. A simulation model of the converter with parasitic circuit was designed. Six topologies of snubber circuits (C, single C, RC, single RC, RCD, single RCD) were investigated in simulation tests. Simulation model of the proposed system has been investigated in Matlab/Simulink/PLECS environment. Input signal parameters like voltage overshoot, rise time, fall time were compared for considered snubber circuits. Experimental tests were carried out for the best simulation results. It confirm the proper choice of snubber circuit.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 120-131
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of high-efficiency interleaved step-up DC-DC converter with coupled inductors to use in renewable energy system
Autorzy:
Tomaszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/377590.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC-DC converter
inductor
renewable energy system
Opis:
The majority of renewable energy sources deliver relatively low output voltage. In renewable energy systems high-efficiency high voltage gain step-up DC-DC converters are required as the interface between low voltage sources and the load. Therefore overall performance of the renewable energy system is strongly affected by the efficiency of step-up DC-DC converter itself. This paper presents high-efficiency interleaved step-up DC-DC converter with coupled inductors. Interleaved approach minimizes the current stress of the switches as well as the a sizes of the inductors but also allows reducing input current ripples. The other advantage of interleaving structure is the flexibility of number of phases extension. The number of working phases can be determined depending on the power requirements of the load. High efficiency is achieved by recycling the energy from leakage inductance present in practical coupled inductors. In order to re-use leakage energy voltage clamp circuit is applied. It allows to minimize voltage stress across the switches further improving the efficiency of interleaved DC-DC converter. The simulation carried out will present parametric and performance characteristics of the converter. Most efficient configuration and the number of phases will be discussed in this paper.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 217-224
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer aided design of snubber circuit for DC/DC converter with SiC power MOSFET devices
Autorzy:
Niewiara, Ł.
Skiwski, M.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/378069.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
snubber circuit
SiC MOSFET
Opis:
In this paper a computer aided design of snubber circuit for DC\DC converter is presented. Due to the presence of parasitic LC circuit in the power stage (inductance and capacitance), it is necessary to use an additional snubber circuit for voltage overshoot and oscillations reduction. A simulation model of the converter with parasitic circuit was designed. Three types of snubber circuits (C, RC, RCD) were investigated in simulation tests. Simulation model of the proposed system has been investigated in Matlab/Simulink/PLECS environment. Input signal parameters like voltage overshoot, rise time, fall time were compared for considered snubber circuits. Experimental tests were carried out for the best simulation result. It confirm the proper choice of snubber circuit.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 84; 77-83
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budowa oraz algorytm sterowania przekształtnika energoelektronicznego zaimplementowanego w niekonwencjonalnym systemie mini elektrowni wodnej dedykowanej dla jednostek jachtowych
Structure and control algorithm of power electronics converter implemented in unconventional mini water plant system dedicated to yachts
Autorzy:
Krystkowiak, M.
Gulczyński, A
Powiązania:
https://bibliotekanauki.pl/articles/376088.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
przekształtnik DC/DC
silnik manewrowy
turbina
algorytm MPPT
Opis:
W artykule zaprezentowano opracowany, niekonwencjonalny system zasilania jednostek jachtowych. Bazuje on m.in. na oferowanym na rynku tzw. silniku manewrowym, który zaadaptowano do pracy generatorowej. Dodatkowo zaimplementowano przekształtnik energoelektroniczny DC/DC dopasowujący parametry wytwarzanej energii elektrycznej przy zmieniających się warunkach pracy całego systemu. Przedstawiono opracowany algorytm sterowania MPPT (Maximum Power Point Tracking) umożliwiający maksymalizację sprawności całego systemu oraz wymieniono ważniejsze funkcje systemu zabezpieczeń.
In this article the unconventional water power system for yachts was presented. It is based on typical maneuvering engine, which was adapted to work as an electric generator. Additionally power electronics DC/DC converter was used. With aid oh this converter we can match parameters of produced energy. To improve the efficiency the elaborated MMPT (Maximum Power Point Tracking) algorithm was also implemented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 27-34
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photovoltaic DC-DC converter test system
Autorzy:
Tomaszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/377931.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC-DC converter
photovoltaic system
PV
PV converter
Opis:
This paper describes LabVIEW based integrated measurement system to determine key parameters of DC-DC converters working in low-voltage photovoltaic (PV) systems. DC-DC converter should demonstrate high efficiency of energy conversion as well as sufficient voltage gain to yield as much energy from PV panel as it is possible. Efficiency and voltage gain can be measured across the number of parameters such as input voltage, output load, frequency and duty cycle of converter driving signals. The LabVIEW application works with both Hioki 8855 data recorder which carries out power measurements and a microcontroller Digital Driver who drives a converter tested. Measurement system allows to automate time consuming measurements as well as experimentally verify DC-DC converter design assumptions. The laboratory test results of selected DC-DC converter prototype as well as sources of error has been discussed in this paper.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 74; 283-288
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon carbide based DC-DC converter – operating analysis
Autorzy:
Niewiara, Ł.
Tarczewski, T.
Grzesiak, L. M.
Powiązania:
https://bibliotekanauki.pl/articles/377549.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC\DC converter
SiC MOSFETS
high switching frequency
Opis:
In this paper operating analysis of DC-DC converter is presented. Silicon Carbide based DC-DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC-DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 88; 109-119
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of high-efficiency interleaved step-up DC-DC boost-flyback converter to use in photovoltaic system
Autorzy:
Tomaszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/378212.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
step-up DC-DC converters
high efficiency
photovoltaic systems
Opis:
In low-voltage photovoltaic (PV) systems high-efficiency high voltage gain step-up DC-DC converters are required as the interface between the PV panel and the load. Therefore overall performance of the PV system is essentially affected by the efficiency of step-up DC-DC converter itself. This paper presents the results of PSpice simulation of high-efficiency interleaved step-up DC-DC converter. The converter integrates boost and flyback topologies. Interleaved approach minimizes the current stress on the switches as well as allows reducing a sizes of the inductors but also decreases input current ripples. The other advantage of interleaving structure is flexibility of number of working phases extension. The number of working phases can be dynamically determined depending on the power requirements of the load. High efficiency assured by boost-flyback topology is achieved by the means of recycling the energy from input leakage inductance and relatively low voltage stress across the transistor switches which enables low drain-to-source resistance transistors application. The simulation carried out will present transient and performance characteristics of interleaved step-up DC-DC boost-flyback converter.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 79; 97-104
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jednofazowy silnik BLDC 300VDC
Single-phase BLDC 300VDC motor
Autorzy:
Ciepliński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/377460.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
silnik BLDC
EMC
bezindukcyjna przetwornica DC/DC
mostek tranzystorowy typu H
Opis:
Niniejszy artykuł poświęcony jest tematyce silników BLDC. W pierwszym rozdziale zaprezentowano metody sterowania silników trójfazowych BLDC oraz procedury wykrycia położenia wału silnika. W dalszej części autor przedstawił realizację fizycznego modelu oraz zaimplementowane algorytmy sterowania poszczególnymi modułami energoelektronicznymi systemu. Opisano również sposoby eliminacji zakłóceń elektromagnetycznych generowanych przez silnik BLDC. W celu umożliwienia weryfikacji poprawności i efektywności działania silnika BLDC zamieszczone zostaną ponadto wyniki badań fizycznego modelu dla wybranych punktów pracy układu.
In the article the elaborated physical model of the single-phase BLDC 300VDC motor was described. The power circuits, control algorithms and the principle of working BLDC motor were presented. Also the chosen research results were analyzed.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 95; 27-34
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation studies of partial parallel isolated DC/DC boost converter
Autorzy:
Krupa, A.
Powiązania:
https://bibliotekanauki.pl/articles/377506.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
boost converter
DC/DC boost converter
energy source
storage device
PSpice model
Opis:
The renewable energy sources or energy storage devices deliver output voltage at the range of around 12 VDC to 48 VDC. In order to obtain at least 350 VDC needed for direct to alternating current conversion the DC/DC power converter should demonstrate significant voltage gain and power conversion efficiency as high as possible. To obtain such level of output voltage at low input voltages transistors of the boost converter must operate with high currents. High efficiency and high voltage gain can be achieved with parallel combination of two or more isolated step-up converters. The converters operate synchronously and in phase, using the same control signals. Balancing transformers are used to ensure the synchronization and equal distribution of current between the power levels. They provide equal distribution of significant input current to a number of smaller current loops. This feature alongside with the use of power MOSFETs with low channel resistance and silicon carbide (SiC) Schottky diodes will reduce losses within the converter and increase the efficiency of entire energy conversion system. This paper presents PSpice simulation results of partial parallel isolated DC/DC boost converter with voltage doubler. In presented circuit high voltage gain and high conversion efficiency were achieved.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 15-21
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budowa i działanie układów sterująco-zasilających zintegrowanych w lampach LED
Structure and operating of drivers and power supply systems integrated in LED lamps
Autorzy:
Putz, Ł.
Kurzawa, M.
Powiązania:
https://bibliotekanauki.pl/articles/378023.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
funkcja przyciemniania
korekcja współczynnika mocy
LED
oświetlenie elektroluminescencyjne
przetwornice DC-DC
sterownik lampy LED
Opis:
W artykule opisano układy sterująco-zasilające stosowne do zasilania diod świecących (LED), zintegrowane w lampie. Artykuł rozpoczyna wprowadzenie, w którym przedstawiono ideę stosowania układów zasilaczy do diod elektroluminescencyjnych. Następnie zaprezentowano ogólną budowę i działanie driverów do lamp LED. Omówiono wady i zalety, a także przedstawiono schematy wybranych, spotykanych obecnie, zasilaczy diod świecących, opartych na scalonych przetwornicach DC-DC. W dalszej części artykułu przedstawiono sposoby: zasilania diod LED, korekcji współczynnika mocy oraz regulacji strumienia świetlnego. Ostatecznie podsumowano przeprowadzone rozważania.
In the article has been described drivers and power supply system’s applied to powered the light emitting diodes (LED). Described systems are integrated in the lamp. At the begin of paper is an introduction, which in has been presented the idea of using the controlled supply systems in electroluminescent lighting. Next, has been shown general structure and operating of driver systems integrated in LED lamps. Also was discussed advantages and disadvantages of selected light emitting diodes’ power supplies, constructed on integrated circuit DC-DC converter, currently used. Application diagrams of this converters have been shown. Later in this paper has been presented the ways: of the electroluminescent diodes’ powering; of the power factor correction (PFC); of the luminous flux control (dimming). Finally the carried considerations have been summarized.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 92; 227-236
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The field-circuit analysis of the start-up operation of the brushless DC motor
Autorzy:
Knypiński, Ł.
Nowak, L.
Radziuk, K.
Le Menach, Y
Powiązania:
https://bibliotekanauki.pl/articles/97355.pdf
Data publikacji:
2010
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC motor
BLDC motors
energy savings
Źródło:
Computer Applications in Electrical Engineering; 2010, 8; 93-104
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Force and stress calculation in DC dielectrophoresis
Autorzy:
Kurgan, E.
Powiązania:
https://bibliotekanauki.pl/articles/378176.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
dielectrophoresis
DC dielectrophoresis
electric field
force calculation
stress calculation
Opis:
In this paper, two-dimensional direct current (DC) dielectrophoresis is presented. First electric field distribution in particle and surrounding fluid is calculated and next stresses acting from both sides suspension-particle boundary are evaluated. These values are fundamental for force calculation in two-dimensional dielectrophoresis and in simulation of the velocity distribution in interdigitated electrodes.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 111-116
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of self-excited synchronous generator with inverter as DC grid voltage source
Autorzy:
Kozak, M.
Powiązania:
https://bibliotekanauki.pl/articles/378011.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
self-excited generator
FOC control
DC grid
controlled voltage source
Opis:
Self-excited generators are the most popular voltage sources installed onboard of modern ships. Because of fuel savings on some specialized vessels (PSV, cable layers etc.) varying revolutions drives are used and this trend seems to increase. Very interesting issue is use of such type of alternator working with inverter acting as rectifier in DC grid system. As the control method most suitable to use is modified field oriented control known from induction machines. This control method involves decoupling of currents and control voltages to flux and torque components and keeping them in optimal (orthogonal) condition. Theoretical background of inverter and synchronous generator adopted FOC control method along with experimental results obtained in laboratory of such system were presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 95; 209-220
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of input shaping and cascade controller for DC drive control
Autorzy:
Gniadek, M.
Powiązania:
https://bibliotekanauki.pl/articles/378089.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
input shaping
command generation
signal shaping
cascade control
DC drives
Opis:
Various mechanical systems demand precise positioning control strategies. Cascade control of DC motor driving unit is still one of the most popular structures of automatic positioning. One of the main problems of this structures are the oscillations of the current, speed and position. All of these oscillations negatively effect on the electronics and mechanics live time. The method of input shaping (or in general signal shaping) is used to reduce this problem. The signal shaping was implemented for reference torque, reference speed and reference position signal. The common work of multiple input shapers is also presented. The results were compared with control without of signal shaping. The robustness for parameters change was tested. The research was conducted in MATLAB/Simulink environment.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 83; 113-118
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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