Temat: differential mode - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Decomposition of EMI Noise into Common and Differential Modes in PWM Inverter Drive System
Autorzy:: Kempski, A.
Smoleński, R.
Tematy:: electromagnetic compatibility
common mode
differential mode
PWM inverter drive system; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262576.pdf Link otwiera się w nowym oknie
Opis:: In this paper [20] an analytical approach to decomposition of total phase EMI noises through algebraic calculations and the Fourier transform has been presented. Separating conducted EMI noise into different, common and differential mode (CM and DM) HF current components is important for a proper spectral analysis and application of EMI mitigation techniques. The results of calculations have been compared to EMI currents measured on the motor side of the PWM drive system. The proposed approach can be useful in comparative analysis of the influence of inverter control algorithms on spectra of CM currents in a given drive system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analytical models synthesis of power electronic converters
Autorzy:: Ales, A.
Cheurfi-Belhadj, M. A.
Schanen, J. L.
Moussaoui, D.
Roudet, J.
Tematy:: EMC modelling
differential mode
common mode
EMC filter
LISN
EMI
conducted noise
noise source; Pokaż więcej
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Powiązania:: https://bibliotekanauki.pl/articles/136182.pdf Link otwiera się w nowym oknie
Opis:: In this paper we proposes a synthesis of different mathematical models of power electronic converters based on Thevenin/Norton equivalent circuits. Those models, composed by impedances and harmonic noise sources, are helpful to predict the conducted ElectroMagnetic Interferences (EMI) generated by converters connected to the electrical network. Moreover, the extracted impedances are determining for sizing EMC filters. The proposed analytical model is tested with PSpice simulations and validated by experimental measurements, from DC frequency until 30MHz.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ground leakage current caused by Common-Mode Voltage of PWM inverter
Prądy upływu doziemnego generowane napięciem wspólnym falownika MSI
Autorzy:: Szymański, Jerzy Ryszard
Żurek-Mortka, Marta
Tematy:: common-mode voltage
differential-mode voltage
PWM modulation
three-phase traction voltage inverter
two-level PWM inverter
dwupoziomowy falownik MSI
napięcie różnicowe
napięcie wspólne
modulacja MSI
trójfazowy trakcyjny falownik napięciowy; Pokaż więcej
Wydawca:: Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
Powiązania:: https://bibliotekanauki.pl/articles/106701.pdf Link otwiera się w nowym oknie
Opis:: In railway tractive vehicles, three-phase PWM (Pulse Width Modulation) inverters generate parasitic Differential-Mode Voltages (DMV) and Common-Mode Voltages (CMV). Parasitic voltages are a side effect of using the width modulation to shape the phase-to-phase inverter’s voltage. In this article, the authors present a mathematical description of the DM and CM voltages and carry out their spectral analysis. Based on the spectral harmonics analysis, the authors present a method for filtration of harmonics of DM and CM voltages aimed at limiting the capacitance parasitic currents: due to DM voltage – phase-to-phase parasitic current and CM voltage – ground parasitic currents. As the final result of the tests, almost complete elimination of leakage parasitic current form PE shock protection system was achieved.
W kolejowych pojazdach trakcyjnych trójfazowe falowniki MSI (Modulacja Szerokości Impulsów) wytwarzają pasożytnicze napięcia różnicowe (Differential Mode Voltage) i wspólne (Common Mode Voltage). Pasożytnicze napięcia są skutkiem ubocznym stosowania modulacji szerokościowej do kształtowania napięć międzyfazowych falownika. W artykule autorzy przedstawiają opis matematyczny napięć DM oraz CM i przeprowadzają ich analizę widmową. Na podstawie przeprowadzanej analizy autorzy przedstawiają metodę filtracji wybranych harmonicznych napięcia DM i CM dla ograniczania wytwarzanych przez nie prądów pasożytniczych: (DM) - międzyfazowych i (CM) – doziemnych. W wyniku badań osiągnięto prawie całkowitą eliminację pasożytniczego prądu upływu doziemnego z systemu ochrony przeciwporażeniowej PE.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Differential and Common Mode Noise Waves and Correlation Matrices
Autorzy:: Dobrowolski, J. A.
Tematy:: differential and common mode noise waves
mixed-mode noise wave correlation matrices
generalized multiport mixed-mode noise wave correlation matrice; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226394.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an innovative extention of the noise wave definition to mixed mode, differential – and common-mode noise waves which can be used for noise analysis of differential microwave networks. Mixed mode noise waves are used next to define generalized mixed mode noise wave correlation matrices of microwave multiport networks. Presented approach may be used for noise analysis of microwave differential networks with differential ports as well as with conventional single ended ports.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Review and comparison of methods for limiting leakage currents in single-phase transformerless PV inverter topologies
Autorzy:: Kołodziejski, Wojciech
Jasielski, Jacek
Kuta, Stanisław W.
Szerszeń, Grzegorz
Machowski, Witold
Tematy:: Differential Mode (DM) voltage
Common Mode (CM) voltage
grid-tied inverter
leakage current
parasitic capacity
photovoltaic (PV) systems
transformerless inverter
napięcie trybu różnicowego (DM).
napięcie trybu wspólnego (CM).
falownik podłączony do sieci
prąd upływowy
pojemność pasożytnicza
systemy fotowoltaiczne (PV).
falownik beztransformatorowy; Pokaż więcej
Wydawca:: Akademia Tarnowska
Powiązania:: https://bibliotekanauki.pl/articles/29521110.pdf Link otwiera się w nowym oknie
Opis:: Transformerless inverters are widely used in different photovoltaic nonisolated ac module applications, mainly in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency over a wide load range, and low cost. Various transformerless inverter topologies have been proposed to meet the safety requirement of low ground leakage currents, such as specified in the VDE-4105 standard and low-output ac-current distortion. Topology modifications of transformerless full bridge inverters are designed to balance and maintain a constant common mode output voltage, thereby eliminating or reducing leakage currents. This article reviews and compares the different methods for limiting leakage currents in known topologies of the full-bridge transformerless inverters, such as: H4, H5, H6, HERIC, and their improvements. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. To compare the properties of different medium to high power inverters, PV inverter topologies were implemented using IGBTs and tested with the same components, same simulation parameters in PSPICE to evaluate their performance in terms of energy efficiency and leakage current characteristics. The detailed power stage operating principles, extended PWM modulator, and integrated universal gate driver with galvanic isolation in the transmission path of control signal for all IGBTs of the inverter, as well isolated and floating bias power supply for gate drivers are described.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Distributive differential modals
Autorzy:: Ślusarska, Karolina
Tematy:: differential groupoid
mode
modal; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/728834.pdf Link otwiera się w nowym oknie
Opis:: A differential modal is an algebra with two binary operations such that one of the reducts is a differential groupoid and the other is a semilattice, and with the groupoid operation distributing over the semilattice operation. The aim of this paper is to show that the varieties of entropic and distributive differential modals coincide, and to describe the lattice of varieties of entropic differential modals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Shape Optimization of Mufflers Composed of Multiple Rectangular Fin-Shaped Chambers Using Differential Evolution Method
Autorzy:: Chiu, M.-C.
Chang, Y.-C.
Cheng, H.-C.
Tai, W.-T.
Tematy:: fin
multi-chamber
high-order-mode
differential evolution; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177237.pdf Link otwiera się w nowym oknie
Opis:: There has been considerable research done on multi-chamber mufflers used in the elimination of industrial venting noise. However, most research has been restricted to lower frequencies using the plane wave theory. This has led to underestimating acoustical performances at higher frequencies. Additionally, because of the space-constrained problem in most plants, the need for optimization of a compact muffler seems obvious. Therefore, a muffler composed of multiple rectangular fin-shaped chambers is proposed. Based on the eigenfunction theory, a four-pole matrix used to evaluate the acoustic performance of mufflers will be deduced. A numerical case for eliminating pure tones using a three-fin-chamber muffler will also be examined. To delineate the best acoustical performance of a space-constrained muffler, a numerical assessment using the Differential Evolution (DE) method is adopted. Before the DE operation for pure tone elimination can be carried out, the accuracy of the mathematical model must be checked using experimental data. The results reveal that the broadband noise has been efficiently reduced using the three-fin-chamber muffler. Consequently, a successful approach in eliminating a pure tone using optimally shaped three-fin-chamber mufflers and a differential evolution method within a constrained space has been demonstrated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A mode-III crack with variable surface effects
Autorzy:: Wang, X.
Schiavone, P.
Tematy:: surface elasticity
variable surface moduli
mode-III crack
Cauchy singular integro-differential equation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/282009.pdf Link otwiera się w nowym oknie
Opis:: We study the contribution of variable surface effects to the antiplane deformation of a linearly elastic material with a mode-III crack. The surface elasticity is incorporated using a modified version of the continuum based surface/interface model of Gurtin and Murdoch. In our discussion, the surface moduli are not constant but vary along the crack surfaces. Using Green’s function method, the problem is reduced to a single first-order Cauchy singular integro-differential equation, which is solved numerically using Chebyshev polynomials and a collocation method. Our results indicate that the gradient of the surface shear modulus exerts a significant influence on the crack opening displacement and on the singular stress field at the crack tips.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: General remarks on dynamic projection method
Autorzy:: Leble, S.
Tematy:: partial differential equations
dynamical system
Cauchy problem
diffusion equation
projection operator
idempotent operators
eigen mode
mode interaction
boundary regime propagation; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1938597.pdf Link otwiera się w nowym oknie
Opis:: A brief history and a mathematical description of the dynamic projection operators technique is presented. An example of the general Cauchy problem for evolution equations in 1+ 1 dimensions is studied in detail. A boundary regime propagation is formulated in terms of operators and illustrated by the simplest one-dimensional diffusion equation. The problem of temperature waves is discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Technique to improve CMRR at high frequencies in CMOS OTA-C filters
Autorzy:: Blakiewicz, G.
Tematy:: common-mode rejection ratio
CMRR
CMOS
OTA
differential pair
OTA-C filters
component mismatch; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200504.pdf Link otwiera się w nowym oknie
Opis:: In this paper a technique to improve the common-mode rejection ratio (CMRR) at high frequencies in the OTA-C filters is proposed. The technique is applicable to most OTA-C filters using CMOS operational transconductance amplifiers (OTA) based on differential pairs. The presented analysis shows that a significant broadening of CMRR bandwidth can be achieved by using a differential pair with the bodies of transistors connected to AC ground, instead of using a pair with the bodies connected to the sources. The key advantages of the technique are: no increase in power consumption (except for an optional tuning circuit), a small increase of a chip area, a slight modification of the original filter. The simulation results for exemplary OTAs and a low-pass filter, designed in a 0.35 μm CMOS process, show the possibility of broadening the CMRR bandwidth several times.
Dostawca treści:: Biblioteka Nauki

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