scholarly journals Radiation Mitigation for Power Line Communications Using Time Reversal

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Amilcar Mescco ◽  
Pascal Pagani ◽  
Michel Ney ◽  
Ahmed Zeddam
Keyword(s):  
Time Reversal ◽  
Electromagnetic Interference ◽  
Low Cost ◽  
Power Line ◽  
International Standards ◽  
Electrical Network ◽  
Electrical Networks ◽  
Power Line Communications ◽  
Radiated Emissions ◽  
New Generation

Power Line Communication (PLC) is the response for nowadays high demand of multimedia services in domestic environment, not only for its fast and reliable transfer characteristics but also for its flexible low cost implementation, since the PLC technology uses the existing electrical network infrastructure and the omnipresent outlets throughout the home. The transfer of such a high bit rate through the mains network generates acceptable radiated emission regulated by international standards, but the increment in speed for new generation PLC may cause higher levels of emissions. This paper explains the use of the Time Reversal (TR) technique to mitigate radiated emissions from PLC systems. This method was probed experimentally in real electrical networks with excellent results: in 40% of the observations, the Electromagnetic Interference (EMI) generated by PLC transmission could be reduced by more than 3 dB, and this EMI mitigation factor could increase to more than 10 dB in particular configurations.

Investigation of Radiated Emissions in Power Line Communications Networks

2008 ◽  
Vol 9 (3) ◽  
Author(s):  
Lin Biao Wang ◽  
Ping Lam So ◽  
Kye Yak See ◽  
Manish Oswal ◽  
Teng Seng Pang
Keyword(s):  
Electromagnetic Interference ◽  
Noise Source ◽  
Experimental Studies ◽  
Power Line ◽  
Dominant Mode ◽  
Test Bed ◽  
Communications Networks ◽  
Power Line Communications ◽  
Radiated Emissions ◽  
Line Network

Experimental studies are carried out to investigate the effectiveness of solving the electromagnetic interference (EMI) problem in power line communication (PLC) networks. A test bed is designed to study the effectiveness of the method. Measurements are carried out in a semi-anechoic chamber using a clamp-on current probe, a rod antenna and a loop antenna to compare the conducted and radiated emissions for the various cases. It is well known that the dominant mode of radiation is common mode (CM). The experimental results show that both the conducted and radiated emissions can be reduced by 15dB. This is achieved by increasing the impedance between the noise source and the power line network across the alternative noise path.

Radiation Mitigation for Power Line Communications Using Time Reversal *

2017 ◽  
pp. 473-491
Author(s):  
Pascal Pagani ◽  
Amilcar Mescco ◽  
Michel Ney ◽  
Ahmed Zeddam
Keyword(s):  
Time Reversal ◽  
Power Line ◽  
Power Line Communications

scholarly journals Line voltage asymmetry in closed electrical networks with distributed generation as a source of electromagnetic interference

2021 ◽  
Vol 2131 (5) ◽  
pp. 052004
Author(s):  
A Antonov ◽  
D Ivanov ◽  
Y Denchik ◽  
E Ivanova ◽  
M Ivanov ◽  
...  
Keyword(s):  
Distributed Generation ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Low Frequency ◽  
Electrical Network ◽  
Technical Equipment ◽  
Electrical Networks ◽  
Electronic Resource ◽  
Voltage Unbalance ◽  
State Registration

Abstract The article reveals relevance of the problem of unbalance of line voltages in closed electrical networks with distributed generation as a source of electromagnetic interference, in particular, the problem of electromagnetic compatibility of coastal and ship technical equipment. There is presented mathematical description of the process of occurrence of conductive low-frequency EMF by the voltage unbalance coefficient in the reverse sequence and an algorithm for finding it; using the equations, parameters of this coefficient are described, such as mathematical expectation, standard deviation, probability of occurrence for the billing period, as a result, a computer program has been developed to calculate these parameters; a method for processing the obtained data of power quality indicators according to the found coefficient has been developed; an algorithm for balancing voltages in an electrical network based on finding the most optimal power supply scheme for end consumers (certificate of state registration of an electronic resource No. 23664).

A New Measurement Method of Conducted EMI on the Power-Line Communications Channel

2013 ◽  
Vol 397-400 ◽  
pp. 1988-1993
Author(s):  
Wei Long Fu ◽  
Ya Lin Guan ◽  
Yang Lu
Keyword(s):  
Electromagnetic Interference ◽  
Measurement Method ◽  
Low Voltage ◽  
Power Line ◽  
Line System ◽  
Power Line Communications ◽  
Noise Characteristics ◽  
Working Principle ◽  
The Time Domain ◽  
Conducted Emi

Various kinds of household appliances have been widely deployed in the low-voltage grid. They inject conducted noise into the power line system, which may cause a detrimental effect on the Power-line Communications (PLC) channel. This paper examines a new measurement method of conducted Electromagnetic Interference (EMI) on the PLC channel. The proposed method is to facilitate the noise characteristic research, which overcomes the potential difficulties when the measurement is performed according to CISPR 16-2-1. In particular, taking the hairdryer as an example, the conducted noises when the motor is deemed as the noise source are measured by employing the presented method. Moreover, this paper also analyzes the conducted noise of the hairdryer both in the time domain and in the frequency domain, and interprets the noise generating mechanisms with the working principle of the motor in detail. The central issue in all these studies is to research the conducted electromagnetic noise characteristics on the PLC channel.

scholarly journals Radiated Emission Due to Common Mode Current in Smps

2020 ◽  
Vol 9 (4) ◽  
pp. 304-308
Keyword(s):  
Electromagnetic Interference ◽  
High Frequency ◽  
Buck Converter ◽  
International Standards ◽  
Common Mode ◽  
Forward Converter ◽  
Semiconductor Switches ◽  
Noise Current ◽  
Radiated Emissions ◽  
Forward Converters

The high frequency switching of semiconductor switches in Switched Mode Power Supplies (SMPS) cause high dV/dt and dI/dt resulting in differential mode (DM) and common mode (CM) conducted and radiated Electromagnetic Interference (EMI). The CM noise current circulating through the ground path is the major contributor for radiated EMI in the frequency range of 30 MHz to 1 GHz which will usually be above the stipulated international standards and are addressed here. The high dV/dt and dI/dt are major sources of EMI producing noise currents which will get coupled to ground through parasitic capacitances. The prominent parasitic capacitors are present in high frequency transformer and the semiconductor’s coupling to ground. They provide path for both DM and CM noise currents. The CM currents flowing in the different prominent parasitic capacitors are obtained by simulation for the four different topologies namely, non-isolated Buck, non-isolated Boost, Flyback and Forward converters. The radiated Emissions are calculated for each of the topologies and are presented. All the four converters are operated at same switching frequencies with same values of parasitic capacitances. The non-isolated Boost converter is found to generate higher radiated emissions due to CM current than the non-isolated buck converter and Forward converter has higher radiated emissions than Flyback converter. The results presented here can be used to decide on the topology of SMPS for a given application when EMI mitigation is a priority.

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