EMI conducted emission in the differential mode emanating from an SCR: phenomena and noise level prediction

1995 ◽  
Vol 10 (2) ◽  
pp. 105-110 ◽  
Author(s):  
R. Scheich ◽  
J. Roudet
Keyword(s):  
Noise Level ◽  
Differential Mode ◽  
Conducted Emission

The AMB System’s EMI Analysis of Backup Helium Circulator for HTR-10GT

2013 ◽  
Author(s):  
Yan Zhou ◽  
JingJing Zhao ◽  
Ni Mo ◽  
Zhe Sun ◽  
SuYuan Yu
Keyword(s):  
Power Amplifier ◽  
Theoretical Basis ◽  
Current Source ◽  
Voltage Source ◽  
Differential Mode ◽  
Common Mode ◽  
Turn On ◽  
Conducted Emission ◽  
The Common ◽  
Amb System

With the application in HTR-10GT, the reliability and stability of the AMB system should be studied deeply. Especially EMI analysis on the switch power amplifier is needed to be done, since which one is the main interference source for AMB during the switch turn-on and turn-off. Based on it, a simplified and improved modeling method is listed by dividing the nonlinear transition into several stages, and the models of the voltage source and current source are built in the form of the piece-wise linear way. The conducted emission on the differential mode noise and the common mode is shown by simulation. The result could provide the theoretical basis on the designing the grounding, filter and isolation for the AMB system.

scholarly journals Specifying Power Filter Insertion Loss Values in Terms of Electromagnetic Safety of IT Equipment

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2041
Author(s):  
Leszek Nowosielski ◽  
Bartosz Dudziński ◽  
Rafał Przesmycki ◽  
Marek Bugaj
Keyword(s):  
Insertion Loss ◽  
Noise Level ◽  
Information Leakage ◽  
Environmental Noise ◽  
Analytical Relation ◽  
Power Filter ◽  
Conducted Emission ◽  
System Input ◽  
Filter Insertion

At present, one of the main methods of minimizing risk resulting from electromagnetic information leakage is to attenuate the undesired levels of radiated and conducted disturbances generated by IT equipment, as these disturbances can carry information processed by said equipment. Attenuation of conducted compromising emissions is most commonly handled with filters with a sufficiently high insertion loss. This article defines an original analytical relation specifying insertion loss value requirements for mains filters and estimates values of parameters included in the defined relation. Furthermore, this defined relation was used to define requirements for insertion loss provided by the mains filters, above which the ratio value of potentially compromising conducted emission levels to the environmental noise level at the infiltrating system input S/N < 0 dB. As a consequence, electromagnetic infiltration is significantly impeded.

scholarly journals Karakterisasi Conducted Emission Noise pada Inverter di Sistem Photovoltaic Off-Grid

2021 ◽  
Vol 10 (1) ◽  
pp. 100-109
Author(s):  
Yudhistira ◽  
Dwi Mandaris ◽  
Yoppy ◽  
Hutomo Wahyu Nugroho ◽  
Prayoga Bakti ◽  
...  
Keyword(s):  
Noise Level ◽  
Sine Wave ◽  
Conducted Emission ◽  
Cispr 25

Gangguan elektromagnetik berupa conducted emission noise yang ditimbulkan oleh inverter pada sistem photovoltaic (PV) off-grid telah berhasil dikarakterisasi. Noise yang merambat pada jalur konduksi dihasilkan dari fenomena switching inverter untuk proses konversi daya dari listrik searah (DC) menjadi arus bolak balik (AC). Standar IEC 62920:2017 dan CISPR 25:2016 digunakan untuk mengukur noise yang dihasilkan oleh inverter di sisi DC. Pengukuran conducted emission noise pada inverter dilakukan dalam tiga kondisi, yakni kondisi tanpa beban, terhubung dengan beban lampu pijar 60 W, dan terhubung dengan beban lampu pijar beserta dimmer untuk variasi daya. Pengukuran dilakukan pada lima buah inverter dengan kapasitas daya dan jenis keluaran (output) yang berbeda-beda, yaitu 200 W, 300 W, dan 700 W untuk tegangan keluaran modified sine wave serta 500 W dan 1.000 W untuk tegangan keluaran pure sine wave. Hasil pengukuran menunjukkan bahwa pada kondisi inverter terhubung dengan beban lampu pijar beserta dimmer, inverter model pure sine wave 500 W dan 1.000 W memiliki peak noise level yang cukup rendah dan berpotensi lebih sedikit untuk menimbulkan gangguan elektromagnetik di sisi DC.

Electron Microscopy in Molecular Biology

1967 ◽  
Vol 25 ◽  
pp. 2-3
Author(s):  
Cecil E. Hall
Keyword(s):  
Electron Microscopy ◽  
Molecular Biology ◽  
Noise Level ◽  
Molecular Structures ◽  
Material Structure ◽  
The Arts ◽  
Shadow Casting ◽  
Electron Image ◽  
High Degree ◽  
Very High

The visualization of organic macromolecules such as proteins, nucleic acids, viruses and virus components has reached its high degree of effectiveness owing to refinements and reliability of instruments and to the invention of methods for enhancing the structure of these materials within the electron image. The latter techniques have been most important because what can be seen depends upon the molecular and atomic character of the object as modified which is rarely evident in the pristine material. Structure may thus be displayed by the arts of positive and negative staining, shadow casting, replication and other techniques. Enhancement of contrast, which delineates bounds of isolated macromolecules has been effected progressively over the years as illustrated in Figs. 1, 2, 3 and 4 by these methods. We now look to the future wondering what other visions are waiting to be seen. The instrument designers will need to exact from the arts of fabrication the performance that theory has prescribed as well as methods for phase and interference contrast with explorations of the potentialities of very high and very low voltages. Chemistry must play an increasingly important part in future progress by providing specific stain molecules of high visibility, substrates of vanishing “noise” level and means for preservation of molecular structures that usually exist in a solvated condition.

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