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Wyświetlanie 1-15 z 32
Tytuł:
A High-Efficient Low-Voltage Rectifier for CMOS Technology
Autorzy:
Jendernalik, W.
Jakusz, J.
Blakiewicz, G.
Kłosowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/220356.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CMOS rectifier
high frequency rectifier
wireless power transmission
Opis:
A new configuration of rectifier suiting CMOS technology is presented. The rectifier consists of only two n-channel MOS transistors, two capacitors and two resistors; for this reason it is very favourable in manufacturing in CMOS technology. With these features the rectifier is easy to design and cheap in production. Despite its simplicity, the rectifier has relatively good characteristics, the voltage and power efficiency, and bandwidth greater than 89%, 87%, and 1 GHz, respectively. The performed simulations and measurements of a prototype circuit fully confirmed its correct operation and advantages.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 261-268
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Study of Solar Power Source for Wireless Systems
Autorzy:
Mazurek, G.
Powiązania:
https://bibliotekanauki.pl/articles/225988.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photovoltaics
renewable energy
solar irradiation
wireless power systems
Opis:
Photovoltaic (PV) technology is an attractive power source for systems with no wired connections to any network. Because of seasonal variations of solar irradiation, designing such a system requires careful analysis in order to provide required level of reliability. In this paper we present results of 16-month measurements of experimental PV system located in Poland. Obtained irradiation values have been verified with reference data from independent sources. The results of this work may be helpful in forecasting the performance of similar PV systems in the same region and allow to make more precise forecasts of power system performance than based only on average monthly irradiation tables.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 271-276
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance phenomena in wireless power supply systems
Autorzy:
Filipiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/97297.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
wireless power supply
q–factor
system performance
inductance compensation
Opis:
The article presents the prospects for application of wireless power supply in electronic devices. A short description of advantages of using this technology including the principle of its operation and construction of typical systems applied in devices of everyday use was provided. Two types of resonance systems used for wireless transmission of energy were presented. Also, advantages and disadvantages of using each of these systems were listed. Furthermore, the impedance and performance analyses of the wireless electric energy transmission systems were discussed. The performance characteristics were presented depending on several parameters in the three–dimensional form. The minimum quality factor of the resonance system, which allows the achievement of the high system performance at low interface between the primary and secondary coil winding was demonstrated. Two tested circuits were compared and the areas of application were determined for each of them. Difficulties related to maintenance of the circuit in resonance and to limitation of losses were determined.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 127-137
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-coil wireless power transfer (MC-WPT) system - analysis method and properties
Autorzy:
Kaczmarczyk, Z.
Bodzek, K.
Ruszczyk, A.
Kasprzak, M.
Domoracki, A.
Powiązania:
https://bibliotekanauki.pl/articles/114244.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wireless power transfer
magnetically coupled coils
resonant circuits
optimization
Opis:
The paper is devoted to some problems of multi-coil wireless power transfer (MC-WPT) systems. It is well known that the effective gap for MC-WPT systems can be extended for relatively long distances preserving high efficiency. The paper is organized as follows. In Section 2, the system is described by a matrix model. This model is prepared to determine system properties. In Section 3, the optimization procedure which allows improving the system performance at the desired operating point is introduced. Section 4 contains the results of experimental verification. Moreover, the paper presents an interesting phenomenon of the current unbalance among the system coils.
Źródło:
Measurement Automation Monitoring; 2015, 61, 10; 480-483
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications
Autorzy:
Kuka, Sokol
Ni, Kai
Alkahtani, Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/1193899.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wireless power transfer
inductive power transfer technique
efficiency
distance
safety
security
Opis:
Over the past few years, interest and research in wireless power transfer (WPT) have been rapidly incrementing, and as an effect, this is a remarkable technology in many electronic devices, electric vehicles and medical devices. However, most of the applications have been limited to very close distances because of efficiency concerns. Even though the inductive power transfer technique is becoming relatively mature, it has not shown near-field results more than a few metres away transmission. This review is focused on two fundamental aspects: the power efficiency and the transmission distance in WPT systems. Introducing the principles and the boundaries, scientific articles will be reviewed and discussed in terms of their methods and respective challenges. This paper also shows more important results in efficiency and distance obtained, clearly explaining the theory behind and obstacles to overcome. Furthermore, an overlook in other aspects and the latest research studies for this technology will be given. Moreover, new issues have been raised including safety and security.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 1-25
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Efficient Inductive Coil Link Design for Wireless Power Transfer to Visual Prostheses
Autorzy:
Celik, M.
Aydin, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031436.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
wireless power transfer
inductive link
magnetic field
telemetry
visual prosthesis
Opis:
Powering therapeutic devices plays a crucial role in the design phase of implantable electronic units. Batteries could not provide sufficient charge storage, used for the lifetime of the device, considering the space available for them. As sophisticated surgical procedures are required with the possible trauma to the patient such as material discrepancy and tissue damage, replacement is quite risky and not an option. Thus, therapeutic devices, especially visual prostheses, receive power wirelessly through inductive coil links which are connected to a battery outside the body. An inductive link is based on the main principle that there are two components such as primary and secondary units. Although primary unit includes the battery outside the body, power transmitter, and control unit, secondary unit under the skin contains amplifier, rectifier regulators, and power control unit. In this study, an inductive coil link is modelled to evaluate fundamental design specifications for visual prostheses. Inductive coil link parameters are quantitatively investigated so that maximum power transfer efficiency and miniaturization, which are critically important for electronics placed in intraocular region, are provided. Considering 20 mm distance, it is concluded that the separation and the size of the coil pair, loop diameter, frequency have a major role to determine the system performance.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 535-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust H∞ output feedback control of bidirectional inductive power transfer systems
Autorzy:
Swain, A.
Almakhles, D.
Neath, M. J.
Nasiri, A.
Powiązania:
https://bibliotekanauki.pl/articles/230097.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inductive power transfer
wireless power transfer
robust control
linear matrix inequalities
sensitivity analysis
Opis:
Bidirectional Inductive power transfer (IPT) systems behave as high order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric uncertainties. To overcome these problems, this paper proposes a robust controller which is designed using linear matrix inequality (LMI) techniques. The output sensitivity to parametric uncertainty is explored and a linear fractional transformation of the nominal model and its uncertainty is discussed to generate a standard configuration for μ-synthesis and LMI analysis. An H∞ controller is designed based on the structured singular value and LMI feasibility analysis with regard to uncertainties in the primary tuning capacitance, the primary and pickup inductors and the mutual inductance. Robust stability and robust performance of the system is studied through μ-synthesis and LMI feasibility analysis. Simulations and experiments are conducted to verify the power regulation performance of the proposed controller.
Źródło:
Archives of Control Sciences; 2017, 27, 1; 41-62
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System identification and tuning of wireless power transfer systems with multiple magnetically coupled resonators
Autorzy:
Winges, J.
Rylander, T.
Petersson, C.
Ekman, C.
Johansson, L.-Å.
McKelvey, T.
Powiązania:
https://bibliotekanauki.pl/articles/136270.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
wireless power transfer
magnetically coupled resonators
system identification
tuning
Bayesian estimation
impedance matching
charging electric vehicles
Opis:
We present a procedure for system identification and tuning of a wireless power transfer (WPT) system with four magnetically coupled resonators, where each resonator consists of a coil and a capacitor bank. The system-identification procedure involves three main steps: 1) individual measurement of the capacitor banks in the system; 2) measurement of the frequency-dependent two-port impedance matrix of the magnetically coupled resonators; and 3) determining the inductance of all coils and their corresponding coupling coefficients using a Bayesian approach. The Bayesian approach involves solving an optimization problem where we minimize the mismatch between the measured and simulated impedance matrix together with a penalization term that incorporates information from a direct measurement procedure of the inductance and losses of the coils. This identification procedure yields an accurate system model which we use to tune the four capacitance values to recover high system-performance and account for, e.g., manufacturing tolerances and coil displacement. For a prototype WPT system, we achieve 3.3 kW power transfer with 91% system efficiency over an air-gap distance of approximately 20 cm.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 86-92
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RF energy harvesting for low power electronic devices: student project
Autorzy:
Mihaylov, K
Powiązania:
https://bibliotekanauki.pl/articles/397947.pdf
Data publikacji:
2014
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
wireless power
RF energy harvesting
small loop antenna
zasilanie bezprzewodowe
RF
energia wysokiej częstotliwości
antena magnetyczna
Opis:
Different methods for RF energy harvesting from radio transmitters with working frequency of up to 108 MHz are examined. Experiments are conducted especially with the LW transmitter near Vakarel village (261 kHz) (Sofia, Bulgaria) and the transmitter of the National Radio “HristoBotev” at radio- tower “Kopitoto” (92. 9 MHz) (Sofia, Bulgaria). Partial success is achieved with electrically small loop antenna resonated at 261 kHz.
Źródło:
International Journal of Microelectronics and Computer Science; 2014, 5, 1; 41-45
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing the Use of Electrochemical Sources of Electricity Through the Use of Wireless Power Supply
Ograniczenie wykorzystania elektrochemicznych źródeł energii elektrycznej poprzez zastosowanie zasilania bezprzewodowego
Autorzy:
Jajczyk, Jarosław
Filipiak, Michał
Dąbrowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1811557.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
electrochemical energy storage
recycling of batteries
recycling of accumulators
wireless power supply
Qi Wireless Charging standard
elektrochemiczny zasobnik energii
recykling baterii
recykling akumulatorów
zasilanie bezprzewodowe
standard Qi Wireless Charging
Opis:
The paper discusses issues related to the recycling of electrochemical sources of electricity such as portable batteries and accumulators. Based on the reports of the Chief Inspectorate of Environmental Protection, the collection rate of waste batteries and accumulators in Poland for the years 2010-2018 was subjected to analysis. Despite the increasing year-to-year percentage value of the collection rate, it has been demonstrated that a significant mass of batteries and accumulators is still not recycled. This article presents a method of reducing the amount of waste electrochemical energy storages, through the use of inductive power supplies. The idea of the operation of such circuits has been discussed and the Qi Wireless Charging standard, applicable since 2011, has been characterised. As an example of a device with wireless power supply, a computer indicator system has been provided. Tests have been carried out and the correctness of operation of this solution has been verified. It has been demonstrated that in some cases it is possible to resign from power supplies based on batteries or accumulators, and use wireless power supplies instead, without degrading the functional properties of devices. Solutions of this type may contribute to the protection of the natural environment.
W pracy omówiono problematykę recyklingu elektrochemicznych źródeł energii elektrycznej takich jak baterie i akumulatory przenośnie. Na podstawie raportów Głównego Inspektoratu Ochrony Środowiska przeanalizowano zbieralność zużytych baterii i akumulatorów w Polsce w latach 2010-2018. Pomimo rosnącego z roku na rok procentowego wskaźnika zbieralności wykazano, że znaczna masa baterii i akumulatorów wciąż nie jest poddawana recyklingowi. W artykule przedstawiono metodę ograniczenia ilości zużywanych elektrochemicznych zasobników energii elektrycznej poprzez zastosowanie zasilania indukcyjnego. Omówiono ideę działania tego typu układów oraz scharakteryzowano obowiązujący od 2011 roku standard Qi Wireless Charging. Jako przykład urządzenia zasilanego bezprzewodowo podano układ wskaźnika komputerowego. Wykonano badania i zweryfikowano poprawność działania tego rozwiązania. Wykazano, że w niektórych przypadkach możliwe jest zrezygnowanie z zasilania bateryjnego lub akumulatorowego na rzecz zasilania bezprzewodowego bez pogorszenia własności funkcjonalnych urządzeń. Rozwiązania tego typu mogą przysłużyć się ochronie środowiska.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 444-455
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on a novel hybrid shielding structure of magnetic coupler for inductive power transfer system
Autorzy:
Liu, Yun Rui
Wang, Chunfang
Xia, Dongwei
Yue, Rui
Powiązania:
https://bibliotekanauki.pl/articles/1841326.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coupling coefficient
electromagnetic shielding
finite element simulation
optimization design
wireless power transfer
współczynnik sprzężenia
ekranowanie elektromagnetyczne
symulacja elementów skończonych
optymalizacja projektu
bezprzewodowy transfer mocy
Opis:
With the development of wireless power transfer technology, more and more attention has been paid to its electromagnetic safety. In this paper, a novel hybrid shielding structure composed of the innermost fan-shaped ferrite, the interlayer nanocrystalline stripand the outermost aluminum foil is proposed to shield the electromagnetic field of the inductive power transfer system. Eight structure parameters of the proposed shielding areoptimized by finite element simulation, in order to reduce the magnetic leakage of the system and improve the utilization rate of shielding materials. In addition, the proposed structure is compared with two types of typical double-layer hybrid shielding from the perspectives of the weight, the coupling coefficient and the magnetic flux leakage. Both simulation and experiment results show that the cost and weight of the proposed shield are about 60% lower than the traditional disk shield. More over, the shielding layer proposed in this paper can not only effectively reduce the magnetic flux leakage of the system, but also maintain a high coupling coefficient.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 129-143
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikro system zasilania bezprzewodowego
The micro power wireless system
Autorzy:
Marciniak, P.
Galla, S.
Powiązania:
https://bibliotekanauki.pl/articles/268645.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
zasilanie
bezprzewodowe
power supply
wireless
Opis:
Wzrastająca na rynku liczba układów mikrokontrolerów o bardzo niskiej konsumpcji energii elektrycznej umożliwia budowę układów zasilania bezprzewodowego, opartych o układy zbierające energię elektryczną z różnych źródeł występujących w naszym otoczeniu. Obecnie powstające układy wytwarzające energie elektryczną korzystają z jej konwersji m.in. z następujących źródeł: promieniowania słonecznego, energii drgań i wibracji, występujących różnic temperaturowych, oraz otaczających nas pól elektromagnetycznych. W artykule przedstawiono wyniki prac nad systemem zasilania bezprzewodowego wykorzystującego zbieranie energii z pól elektromagnetycznych związanych z pracującymi układami telefonii komórkowej oraz pasma 868 MHz.
The occurrence of electrostatic discharge can lead to very large losses in production or service of electronic equipment. In case of special production ESD can even lead to serious accidents. Phenomenon of electrostatic discharge (ESD) is related to such physicochemical processes friction, grinding, spraying and rapid separation or combining of non-conductive, or well-insulated solid, liquid and/or gas. In some cases it is necessary to monitor continuously the protected zone. This article presents ongoing work on electrostatic discharge detection system based on the collection and analysis of electromagnetic emission signal appearing at the time of ESD occurrence. The article presents results obtained from simulation studies and shows the system made on the basis of previously mentioned results.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 101-103
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic Field Generated by Wireless Alarm Devices
Autorzy:
Pospisilik, M.
Vnencakova, E.
Powiązania:
https://bibliotekanauki.pl/articles/963854.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless communication
power density
electromagnetic field
Opis:
Together with the rise of importance of devices employing wireless networks based on the principle of radio frequency data transfers, also the discussion on harmfulness of the electromagnetic radiation has occurred. The authors of this paper obviously cannot provide unambiguous answers to stop this discussion. On the other way, they can provide the reader of this paper with real data obtained by measurements processed inside a semi anechoic chamber that were performed at several wireless alarm peripherals. The measured values are compared to the technical and hygienic standards so the reader can form an idea of the amount of the radiated energy. Moreover, examples of waterfall diagrams of spectra generated by the devices are also listed in this paper.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 57-64
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Policies for Transmit Power Control in the Conditions of Jamming in Clustered Wireless System
Autorzy:
Michalak, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1844445.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
clustered network
transmit power control
jamming
wireless system
Opis:
This article presents a consistent solution of Transmit Power Control in centralized (clustered) wireless network with and without jamming. Depending on the policy assumed, appropriate solutions are applied to minimize the power used in a system or to satisfy expected Quality of Service. Because of specific nature of the system there is no optimal solution which can be applied in practice. Correctness and effectiveness of four proposed Transmit Power Control algorithms was presented in the form of computer simulation results in which the system capacity, mean power used and the number of successful links were described.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 679-685
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototype of a DSP-based instrument for in-service wireless transmitter power measurement
Autorzy:
Angrisani, L.
Cennamo, F.
Scarpato, G.
Schiano Lo Moriello, R.
Powiązania:
https://bibliotekanauki.pl/articles/220862.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless transmitters
power measurements
in-service testing
DSP
Opis:
A prototype of a DSP-based instrument for in-service transmitter power measurements is presented. The instrument implements a signal-selective algorithm for power measurements that is suitable for use in wireless environments, where possible uncontrolled interfering sources are present in the radio channel and are overlapped to the signal emitted by the transmitter under test, possibly in both time and frequency domain. The measurement method exploits the principles of cyclic spectral analysis, which are briefly recalled in the paper. Potentialities, as well as limitations of the prototype use are discussed, and the results of experiments with both modulated and unmodulated interfering sources are presented.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 699-708
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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