Radiation Emission EMC Measurement in Real-Time.
Conference: Sixth International Conference on Information Technology: New Generations, ITNG 2009, Las Vegas, Nevada, 27-29 April 2009
Notice of Violation of IEEE Publication Principles"Radiation Emission EMC Measurement in Real-Time"by F.G. Awan, N.M. Sheikh, M. Fawadin the Proceedings of the Information Technology: Sixth International Conference on New Generations, ITNG '09, pp.528-533, April 2009After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.This paper contains significant portions of original text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission.Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article:"Taking Time-Domain EMI Measurements According to International EMC Standards,"by S. Braun and P. Russer in Compliance Engineering Journal, vol. 23, no. 1, pp. 45ߝ54, March 2006.For electromagnetic compatibility, radiation emission measurements are to date carried out in frequency domain in accordance with applicable emission measurement CISPR and ANSI standards, using a conventional heterodyne receiver. This paper discusses and summarizes the theory, setup, and algorithms in time domain, as well as the practical aspects of pre and full compliance radiation emission measurement system in real time resulting in comparison, a good many orders faster measurements using several sub-bands processing units for the frequency range up to 1 GHz. By making use of the deterministic and stochastic processes and fast Fourier transform based time frequency analysis, the digital signal processing is used for the statistical spectral estimation and detection, that provides same degree of accuracy and signal to noise ratio by the parallel emulation- of all required detector modes and auxiliary outputs, and better dynamic range with lower noise floor than with conventional EMC receivers and spectrum analyzers. This will considerably reduce the compliance test and development costs of electrical devices.
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ABSTRACT: The common mode and diﬀerential mode interference propagated through the single-phase power-line cable is usually suppressed with power-line ﬁlters. This kind of ﬁlters is composed by common-mode chokes, X capacitors and Y capacitors to mitigate both the common mode and the diﬀerential mode. However, the present-day power-line ﬁlter design methodologies present some disadvantages: they are designed to be placed in an ideal 50-Ω system and the common mode and diﬀerential mode attenuations are analyzed independently, without considering the mode conversion that can be produced by asymmetries in the power-line ﬁlter, in the power-line network or in the electric device. These facts lead to inaccurate predictions of the power-line ﬁlter behavior and, consequently, the suitable ﬁlter is usually selected by trial and error in long and expensive measurement sessions. In order to improve this situation, this work presents:
- New measurement systems and characterization methodologies to completely model the behavior of power-line ﬁlters, power-line networks and electric devices. To this end, a new characterization methodology is presented: the modal characterization, that conﬁnes the common mode and the diﬀerential mode into a diﬀerent port and provides the information about the propagation of the modal interference, information that can be useful to select the suitable ﬁlter for its mitigation.
- A new methodology to accurately predict the level of conducted emissions that an electric device supplies to the power-line network through its power-line ﬁlter, based on the measurement systems and characterization methodologies presented before. Accurate characterizationswillallowpredictionssimilartotheactualconductedemissions, avoiding long measurement sessions.
- New design methodologies of power-line ﬁlters to achieve optimal and low cost implementations. In a ﬁrst proposal, the components of the power-line ﬁlters are modally characterized to ﬁnd, by computation, the combination that gets the desired ﬁltering response with the minimum number of components. This methodology is further improved by using asymmetric power-line ﬁlters, obtaining an optimal mitigation of the common and diﬀerential mode.
All measurement systems, as well as characterization, prediction and designing methodologies, have been successfully tested on actual devices.
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