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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:
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:
A High Gain Single Switch DC-DC Converter with Double Voltage Booster Switched Inductors
Autorzy:
Addagatla, Nagaraju
Boini, Rajender
Powiązania:
https://bibliotekanauki.pl/articles/2201925.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
multilevel converter
boost converter
DC-DC converter
high gain converters
Opis:
The research for novel power conversion topologies and the development of cutting-edge power component technologies are driven by the demand for renewable and much more efficient electricity generation, delivery, and conversion. Simulation and Analysis High Voltage Gain DC-DC Converter with Double Voltage Booster Switched Inductor for PV Applications are analyzed in this paper. Multilevel boost converter topologies recently reintroduced, are gaining popularity as a solution for industrial and transportation power systems because they enable the use of innovative, efficient, but relatively low voltage low-voltage devices at greater voltage and power levels. there is only one power switch on the converter that is planned here, three diodes, two capacitors, and two inductors to achieve ultra-high gain with better efficiency. High voltage gain, minimal switch stress, and the ability to lessen input-current ripple and capacitor voltage ripple are all benefits of the topology. When it switches complementary, the capacitors' ripple is reduced, which lowers the size requirement for the capacitors. A 12V, 500 watts prototype was analyzed, simulated and designed. at a duty cycle of 0.75 it is achieved high DC-DC gain i.e 19 and efficiency 93%. The practicality of the converter will be demonstrated by the close agreement between the analysis and simulation findings.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 1--11
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcje systemów modułowego zasilania na przykładach układów zasilania latarek LED
Example concepts of module supply circuits for LED flashlight
Autorzy:
Hejke, B.
Jesionek, S.
Szewczyk, A.
Galla, S.
Powiązania:
https://bibliotekanauki.pl/articles/268366.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
latarka LED
przetwornica DC/DC
LED flashlight
DC-DC converter
Opis:
W referacie przedstawiono rozwiązania systemów zasilania do zastosowania w modułowych latarkach LED pozwalające na optymalizację zużycia energii, a tym samym wydłużenie czasu ich pracy. Przedstawiono podstawowe wymagania stawiane układom zasilania stosowanym w powyższych rozwiązaniach oraz przedstawiono dwie zrealizowane koncepcje ich wykonania. Na wykonanych prototypach układów przeprowadzono pomiary a uzyskane wyniki zostały przedstawione w referacie wraz z podstawową analizą koszt - efekt. Wykonane układy pozwalają na efektywne zmniejszenie zużycia baterii zasilających w latarce LED, co przekłada się na wydłużenie czasu pracy i oszczędności finansowe.
In the paper, several concepts for supply system for LED flashlight are discussed. The aim of proposed solutions is to optimize energy consumption and thereby lengthen the time of operation without battery changes. Most popular methods of LED supply are presented and discussed, as direct supply current control and current pulse width modulation. Two circuit for LED flashlight are presented. First is based on MCP1640 integrated DC-DC converter. The circuit printed board is intended to be installed in the battery container of LED flashlight in a place of one of three batteries. Two batteries that left are sufficient to supply the flashlight. The second circuit contains DC-DC integrated converter MAX1796 and PWM current control circuit that allows to control LED intensity of light. The circuit could be powered with one 1,5 V battery and its small dimensions allow to build it into flashlight casing. Both solutions were tested and proved their usefulness. They allow to reduce battery power consumption and extend working hours and reduce costs.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 57; 21-24
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All-Bootstrap Gate-Driver Supply System for a High-Voltage-Gain Resonant DC-DC Converter with Seven Switches
Autorzy:
Stala, Robert
Mondzik, Andrzej
Penczek, Adam
Waradzyn, Zbigniew
Skała, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1193880.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
FPGA
DC-DC converter
digital control
gate driver circuit
Opis:
This paper presents the concept and implementation of an electronic system for a switched-capacitor DC-DC converter with high voltage gain. The converter consists of seven switches, five of which being controlled like high-side type. This paper presents a non-typical bootstrap-based gate-driver system so that the converter can run using a single voltage source. The converter requires a special switching pattern to drive seven switches in a steady state and also during the start-up of the converter and the regulation of the output voltage. Therefore, an FPGA-based digital control system is used with various switching algorithms and protection functions implemented. The presented converter is an autonomic device that taps the energy from the main input. Therefore, the electronic system of the converter is equipped with a self-supply system with a wide range of the input voltage. The parameters of the converter such as voltage gain, voltages and power ranges can be scalable for prospective applications with the proposed control system.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 135-142
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of a Transformerless Dual Active Half-Bridge Converter
Autorzy:
Sosnowski, Robert
Chojowski, Maciej
Baszyński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2175937.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DC-DC converter
bidirectional converter
phase-shift control
zero voltage transient
Opis:
This paper proposes a transformerless dual half-bridge converter (TLDAHB). By eliminating the transformer and harnessing the possibility of using a low inductor value, it is possible to minimise the size of the converter. A phase-shift pulse width modulation will result in a wide controlled voltage gain of the converter and operation as buck and boost. The theoretical topology analysis, simulation, and experimental results are presented. Theoretical analysis consists of analysis of power transfer and design. In case of experimental research, particular attention was paid to power transfer and efficiency analysis. Near zero switching transient of voltage in the half-bridge topology results with high efficiency.
Źródło:
Power Electronics and Drives; 2022, 7, 42; 146--158
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A cost-effective resonant switched-capacitor DC-DC boost converter – experimental results and feasibility model
Autorzy:
Waradzyn, Z.
Stala, R.
Skała, A.
Mondzik, A.
Penczek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1193543.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DC-DC converter
switched-capacitor
voltage multiplier
charge pump
ZCS
Opis:
This paper presents the results of experimental research of a resonant switched capacitor voltage multiplier in a cost-effective topology (CESCVM) with a limited number of active switches. In the charging mode of the switched capacitors, the converter utilizes only one active switch and a required number of diodes. Therefore, the cost of the converter is decreased as compared with that of a classical SCVM converter, owing to a lower number of switches and gate driver circuits, as well as a smaller PCB area. Moreover, the CESCVM has simpler control circuits and higher reliability. This paper presents the original experimental results of the operation of the CESCVM converter. A concept of the bootstrap supply of gate drivers of the flying switches is also examined.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 75-83
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and testing of a low cost peak-power tracking controller for a fixed blade 1.2 kVA wind turbine
Autorzy:
Gitano, H.
Taib, S.
Khdeir, M.
Powiązania:
https://bibliotekanauki.pl/articles/262657.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
wind turbine
DC-DC converter
peak power tracking
power controller
Opis:
Wind turbines are a common source of electrical power generation in rural sites around the world. The power generated by a wind turbine at a given wind speed is a non-linear function of rotor speed. This results in a specific rotor speed for maximum power production at each wind speed. A control system incorporating a Pulse Width Modulated DC -DC converter has been designed to vary the load on the wind turbine thereby forcing it to operate at its maximum power point. Another important feature of the controller is the application of electrical stall-breaking of the turbine. The circuit was then tested on a turbine test bed simulating various wind speeds, and the “peak-power tracking” capability and electrical breaking capability were verified. The system gave an overall efficiency of 70 to 80% over a wide range of wind speeds and PWM duty cycles.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 95-101
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A two-phase DC-DC converter and its application in the automotive technology
Dwu-fazowy przekształtnik prądu stałego na prąd stały i jego zastosowanie w technice samochodowej
Autorzy:
Tutaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/263323.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
energia elektryczna
przekształtnik prądu stałego
DC-DC converter
electrical energy
Opis:
In the paper are presented some applications of a two-phase DC-DC converter in the automotive technology, between others, for effective DC-DC energy conversion between a super-capacitor battery and an electrical machine (an automotive AC-DC generator) recuperated an electrical energy during a regenerative braking, or as an advanced DC-DC converter for the automotive two-voltage 42/14 V[DC] power supply system, and/or as an advanced DC-DC converter in comparison with a conventional DC-DC converter co-operating with fuel-cells in hybrid-electric vehicles, etc. In the paper are also presented results of laboratory tests of the advanced DC-DC converter in co-operation with the supercapacitor battery, which confirm a higher converter-current working capacity and a lower alternating component of the output current.
W artykule przestawiono kilka zastosowań dwufazowego przekształtnika prądu stałego na prąd stały w technice samochodowej, między innymi dla skuteczniejszego przetwarzania energii elektrycznej pomiędzy baterią superkondensatorów a maszyną elektryczną (prądnicą samochodową). Maszyna ta odzyskuje energię podczas hamowania odzyskowego bądź jako ulepszony przekształtnik w samochodowych dwu-napięciowych systemach zasilania prądu stałego 42/14V[DC], lub jako ulepszony przekształtnik energii prądu stałego w porównaniu do układu konwencjonalnego, współpracujący a baterią ogniw paliwowych w pojazdach z napędem hybrydowym itp. W artykule zamieszczono również wyniki badań laboratoryjnych przekształtnika w zastosowaniu we współpracy z baterią superkondensatorów, które potwierdzają wyższą wydajność prądową przekształtnika i mniejszą składową przemienną prądu wyjściowego.
Źródło:
Archiwum Motoryzacji; 2010, 4; 279-286
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural capacitor voltage balance in multilevel flying capacitor converters. A review of research achievements
Autorzy:
Stala, R.
Powiązania:
https://bibliotekanauki.pl/articles/1193250.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flying capacitor converter
natural capacitor voltage balance
multilevel converter
inverter
DC-DC converter
Opis:
The flying-capacitor (FC) topology is one of the more well-established ideas of multilevel conversion, typically applied as an inverter. One of the biggest advantages of the FC converter is the ability to naturally balance capacitor voltage. When natural balancing occurs neither measurements, nor additional control is needed to maintain required capacitors voltage sharing. However, in order to achieve natural voltage balancing suitable conditions must be achieved such as the topology, number of levels, modulation strategy as well as impedance of the output circuitry. Nevertheless this method is effectively applied in various classes of the converter such as inverters, multicell DC-DC, switch-mode DC-DC, AC-AC, as well as rectifiers. The next important issue related to the natural balancing proces is its dynamics. Furthermore, in order to reinforce the balancing mechanism an auxiliary resonant balancing circuit is utilized in the converter which can also be critical in the AC-AC converters or switch mode DC-DC converters. This paper also presents an issue of choosing modulation strategy for the FC converter due to the fact that the natural balancing process is well-established for phase shifted PWM whilst other types of modulation can be more favorable for the power quality.
Źródło:
Power Electronics and Drives; 2016, 1, 36/2; 5-33
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Transformer Class E Amplifier
Autorzy:
Mikolajewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/141694.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Class E amplifier
resonant inverter
DC-DC converter
transformer
leakage inductance
Opis:
In a high-efficiency Class E ZVS resonant amplifier a matching and isolation transformer can replace some or even all inductive components of the amplifier thus simplifying the circuit and reducing its cost. In the paper a theoretical analysis, a design example and its experimental verification for a transformer Class E amplifier are presented. In the experimental amplifier with a transformer as the only inductive component in the circuit high efficiency ηMAX = 0.95 was achieved for supply voltage VI = 36 V, maximum output power POMAX = 100 W and the switching frequency f = 300 kHz. Measured parameters and waveforms showed a good agreement with theoretical predictions. Moreover, the relative bandwidth of the switching frequency was only 19% to obtain output power control from 4.8 W to POMAX with efficiency not less than 0.9 in the regulation range.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 621-633
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Averaged Model of the Diode-transistor Switch for Modelling Characteristics of a Boost Converter with an IGBT
Autorzy:
Górecki, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/226814.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC-DC converter
IGBT
boost converter
averaged model
diode-transistor switch
modelling
SPICE
Opis:
DC-DC converters are popular switch-mode electronic circuits used in power supply systems of many electronic devices. Designing such converters requires reliable computation methods and models of components contained in these converters, allowing for accurate and fast computations of their characteristics. In the paper, a new averaged model of a diode-transistor switch containing an IGBT is proposed. The form of the developed model is presented. Its accuracy is verified by comparing the computed characteristics of the boost converter with the characteristics computed in SPICE using a transient analysis and literature models of a diode and an IGBT. The obtained results of computations proved the usefulness of the proposed model.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 3; 555-560
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of the heat accumulator and improvement of the DC-DC converter for hybrid-electric vehicles
Autorzy:
Kosztyła, T.
Tutaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/245370.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
simulation
road transport
DC-DC converter
propulsion system
heating system
hybrid vehicle
Opis:
In this article, both problems of the internal combustion-engine’s thermal equilibrium as well as improving the DC-DC converter’s operation in the hybrid-electric vehicle’s propulsion system. The purpose of the proposed amendments is to increase the energy efficiency of the hybrid-electric vehicle’s propulsion system. Such a hybridelectric vehicle in city traffic is characterized by intermittent operation of the internal combustion engine with long pauses, which causes difficulty in obtaining and maintaining the desired operating temperature of the internal combustion engine, especially at low outdoor temperatures and intensive use of the heating system inside the hybridelectric vehicle. The result is the increased emission of noxious exhaust gas components and increased fuel consumption. The proposed solution to this problem is to apply heat accumulator in the cooling system. It is stored in the waste heat from the cooling system used to obtain and maintain the internal combustion engine’s nominal operating temperature. The paper presents the results of simulation analyses the impact of applying heat accumulator in the hybrid-electric vehicle driving in city traffic, at different ambient conditions, such as: air temperature, internal combustion engine’s load and the frequency and length of stops. The proposed algorithm for controlling the circulation of the cooling liquid ensures as soon as possible to achieve and maintain the internal combustion engine’s temperature. Furthermore, the temperature of the operating medium can be adjusted depending on the operating conditions of the internal combustion engine. Experimental studies, on the example of the Toyota Prius and Yaris, confirmed the desirability of the use of the proposed solution. Improving the DC-DC converter’s current is to change the configuration by the use of a two-phase DC-DC converter – instead of a single-phase DC-DC converter, supplying a DC-AC inverter of the DC motoring the hybrid-electric vehicle’s propulsion system. This article also includes waveforms for comparison of the properties of both DC-DC converters.
Źródło:
Journal of KONES; 2016, 23, 3; 263-270
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies
Autorzy:
Stala, R.
Piróg, S.
Penczek, A.
Kawa, A.
Waradzyn, Z.
Mondzik, A.
Skała, A.
Powiązania:
https://bibliotekanauki.pl/articles/953065.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DC-DC converter
high power converters
resonant converter
high voltage gain
zero current switching
przetwornica DC/DC
konwerter
moc
wysokie napięcie
Opis:
This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 639-651
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A CTS pump with a crossed-coupled output for higher conversion efficiency
Autorzy:
Hsieh, Z. H.
Huang, N. X.
Shiau, M. S.
Wu, H. C.
Yang, S.-Y.
Liu, D.-G.
Powiązania:
https://bibliotekanauki.pl/articles/397847.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
DC-DC przetwornice
CTS ładunek pompy
sprzężenie skrośne ładunku pompy
DC-DC converter
CTS charge pump
cross coupled charge pump
Opis:
In this paper, a novel switching-capacitor DC-DC voltage converter with higher efficiency will be presented. This circuit was designed by modifying the output stage of the conventional static charge-transfer-switch (CTS) charge pump in a cross-coupled configuration. In this design, a control scheme to overcome both the reverse charge sharing and the threshold drops in the CTS pump was also employed. In this study, the capacitances for all the pumping capacitors were selected the same as 0.1 μF. With this design, our circuit can operate with a clock rate up to 1 MHz. The performance of this circuit was first evaluated by simulation by HSPICE with the 0.35-μm technology of TSMC. The results showed that this circuit can pump the low input of 1.5V nearly 5 times at the output. The conversion gain can be around 95%. The performance of the real chip manufactured by TSMC was measured and will be compared with the simulation results.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 1; 9-14
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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