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    Wyświetlanie 1-8 z 8
    Tytuł:
    Derivation of Closed-Form Design Equations for Idealized Operation of Inverse Class-E Power Amplifiers at Any Duty Ratio
    Autorzy:
    Wang, Y.
    Foo, S. K.
    He, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/226130.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Class E
    power amplifier
    numerical simulation
    Opis:
    Complementary to the conventional class-E topology, inverse class-E operation has several advantages over the class-E counterpart, such as lower peak switch voltage and smaller circuit inductance, which are attractive to high power RF design and MMIC implementation. This paper derives the closed-form design equations that can be used to synthesize the idealized operation of inverse class-E power amplifiers at any switch duty ratio. Calculation of the key design parameters, such as the maximum switch voltage and circuit components values, is elaborated and compared with the case of conventional class-E operation. Further, the theoretical analysis is confirmed and verified by numerical simulations performed on a 500mW, 2.4 GHz idealized inverse class-E power amplifier.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 3; 281-287
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A self-oscillating h.f. power generator with a Class E resonant amplifier
    Autorzy:
    Mikołajewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200528.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Class E amplifier
    self-oscillating power generator
    output power control
    Opis:
    Self-oscillating h.f. power generators with a Class E amplifier are used as industrial high-efficiency h.f. power sources. In the paper a modification of the classic Class E generator by applying an additional capacitor in the matching and feedback circuit is presented. The proposed solution increases the degree of freedom in the generator design and can noticeably reduce its cost by eliminating the need for the use of high-value h.f. capacitors in the feedback loop divider. The self-oscillating Class E generator (150 W/6.78 MHz) with the proposed modification has been designed, built and its parameters were measured. Theoretical predictions were in a good agreement with experimental results. Moreover, the burst control method of the output power in the generator has also been presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 527-534
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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:
    Analysis of operation of class E ZVS resonant inverter
    Autorzy:
    Szychta, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/262645.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    class E ZVS resonant
    inverter
    output capacitance
    MOSFET transistor
    zero voltage switching
    Opis:
    The article discusses class E zero-voltage-switching resonant inverter (ZVS). The resonant circuit of the inverter is subject to mathematical analysis using the method of state variables with the aid of MATLAB software. Results of simulation testing, based on Simplorer software, of an inverter at the operating frequency of 100kHz are presented.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 57-67
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototyp układu bezprzewodowej transmisji energii elektrycznej
    Prototype of wireless energy transfer system
    Autorzy:
    Cieśla, T.
    Kaczmarczyk, Z.
    Stępień, M.
    Kustosz, R.
    Grzesik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/152684.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bezprzewodowa transmisja energii
    falownik klasy E
    prostownik synchroniczny
    wireless energy transfer
    Class E inverter
    synchronous rectifier
    Opis:
    W artykule opisano prototyp układu bezprzewodowej transmisji energii elektrycznej, który może być zastosowany do zasilania protezy serca. Opisano poszczególne podzespoły prototypu oraz zaprezentowano wybrane wyniki pomiarów przy mocy wyjściowej ~30 W i odległości pomiędzy planarnymi cewkami sprzężonymi magnetycznie 10÷15 mm. Przy mocy wyjściowej 32,5 W i odległości pomiędzy cewkami 13 mm, pomimo wysokiej częstotliwości pracy układu (800 kHz), uzyskano całkowitą sprawność 92,3%. W artykule zaproponowano metodę projektowania układu oraz oszacowano rozkład strat mocy w jego podzespołach.
    A prototype of a wireless energy transfer system is described in the paper. It could be applicable for powering the artificial heart. Wire-less energy transfer is based on magnetically coupled planar coils (Fig. 4). The coils are attached to the coordinate table (Fig. 2) which is used to set the distance between them. The system operates at 800 kHz with output power of ~30 W and distance between the coils of 10÷15 mm. It is powered by a Class E inverter (Fig. 3). A synchronous rectifier (Fig. 6) and capacitive output filter are used to supply a resistive load with high efficiency. In order to minimize power losses of the system, an appropriate design procedure is included and explained in the paper. The prototype system was fabricated and tested to confirm theoretical predictions. Meas-ured voltage and current waveforms illustrates the inverter and synchronous rectifier operation (Fig. 7). The DC-DC efficiency and output power of the system as a function of the distance between the coils were also measured (Fig. 8). The maximum efficiency of 92,3% was obtained for the distance between the coils of 13 mm and output power of 32,5 W. Additionally, the analysis of power losses distribution in each component of the system was included (Fig. 9). The results confirm satisfactory performances of the tested prototype system.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 8, 8; 922-925
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distance Learning in the Polish and Korean Universities During COVID-19 Pandemic
    Autorzy:
    Juszczyk, Stanisław
    Kim, Suwan
    Powiązania:
    https://bibliotekanauki.pl/articles/1963969.pdf
    Data publikacji:
    2020-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Polska
    South Korea
    distance learning
    university
    e-learning
    e-class
    Opis:
    At work, distance learning methods have been compared in Silesian University of Technology in Gliwice (Poland) and Hankuk University of Foreign Studies in Seoul (South Korea). The results of the empirical research among the academic teachers and students conducted in both universities are similar: distance learning is not satisfying for both groups and it is not effective.
    Źródło:
    The New Educational Review; 2020, 62; 115-127
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitorowanie procesu kształcenia ucznia – e-dziennik
    Monitoring the Student’s Education Process – e-Class Register
    Autorzy:
    PIECUCH, ALEKSANDER
    Powiązania:
    https://bibliotekanauki.pl/articles/456613.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    e-dziennik
    system informatyczny
    komunikacja rodzic-szkoła
    e-class register
    IT system
    parent-school communication
    Opis:
    ziennik elektroniczny w założeniu ma przynieść korzyści trzem stronom procesu edukacji: uczniowi, rodzicowi i nauczycielowi. Dla ucznia winien stanowić informację zwrotną i pełnić rolę motywacyjną. Dostęp rodzica do e-dziennika ma na celu zintensyfikowanie wzajemnej komunikacji ze szkołą. Nauczyciel natomiast zyskuje narzędzie wspomagające go w procesie dydaktycznym i sprawozdawczym. Artykuł jest próbą odpowiedzi na pytanie, czy te założenia znajdują potwierdzenie w rzeczywistości.
    An e-class register is intended to benefit the three parties of the education process: the student, the parent and the teacher. For the student, it should provide feedback and act as an incentive. Parent’s access to the e-class register is aimed at intensifying mutual communication with the school. The teacher gains a tool to assist him in the didactic and reporting process. The article is an attempt to answer the question whether these assumptions are confirmation in real.
    Źródło:
    Edukacja-Technika-Informatyka; 2019, 10, 2; 80-85
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Державна політика України: між цивілізаційними і національними викликами
    Polityka państwowa Ukrainy: pomiędzy cywilizacyjnymi i narodowymi wezwaniami
    Autorzy:
    Газізов, Михайло
    Powiązania:
    https://bibliotekanauki.pl/articles/489456.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Naukowe w Żytomierzu
    Tematy:
    state policy
    Ukraine
    modernization
    political class
    national safety
    e-governance
    Opis:
    The key aspects of the state policy of Ukraine are considered in the context of the development of the civilizational challenges of the present day and the requirements of ensuring national safety. Separate attention applies on determination of role of national political class in realization of public policy in area of modernisation transformations. After all, the readiness of the national political class to implement the reform program of the systemic transformation of the state and society is one of the determining factors of the success of the state policy. The author argues that the emergence of a consolidated political class, which clearly recognizes national priorities and is able to defend and defend national interests, is an urgent need for the present and future for Ukraine. In the context of the coverage of the studied issues, the peculiarities of the institutional design of the Ukrainian state and its influence on state policy were determined. It is stressed that despite the tangible democratic progress of recent decades, the threat of an increase in autocratic and authoritarian tendencies in state policy, on the one hand, and the weakening of those already shaky germs of forms of direct democracy (for example, participation democracy, self-governing forms of organization citizens), without the development of which it makes no sense to speak about the modernization potential of the state policy of modern Ukraine. For example, the real political state of the basic state and social institutions, the domination of informal rules of the game on the political field, allows us to characterize the state of the political system of Ukraine today and its separate political institutions as hybrid. One of the examples of successful implementation of the state policy of modernization of the Ukrainian state can be considered a gradual transition to the e-governance system. E-Governance refers to innovative state policy and government technologies that are designed to ensure the effective implementation of the three functions of public policy - information, communication and participation. Therefore, the active introduction of e-governance is not just time requirements; it is the approximation of state policy to modern standards of democratic, modernized state-political control. However, it should be noted that the proliferation of e-governance entails tangible threats to the national state and national security. Let’s say the threat of violation of sovereignty. In a geopolitical situation in which Ukraine emerged after 2014, such a threat is not only virtual, but quite tangible, which puts forward special requirements to the system of state policy both at the personalized and institutionalized levels of functioning. Under such conditions, one of the main tasks of state policy is to create a reliable system of cybernetic protection of state sovereignty and national security of the country, which would maximally protect the Ukrainian state and Ukrainian citizens on the institutional and personal levels, respectively. On the other hand, an e-governance system that would be able to organically integrate into the system of global e-communication should be developed, pushing the Ukrainian state into a group of countries - pioneers of the total internetisation of the state and society. Further research on this issue should be concentrated, among other things, as the author believes, in the development of models for reviewing the principles of state policy in Ukraine in the context of the deployment of the integration of the national state into a globalized world political process.
    Źródło:
    Studia Politologica Ucraino-Polona; 2018, 8; 103-107
    2312-8933
    Pojawia się w:
    Studia Politologica Ucraino-Polona
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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