Imbalance difference model for prediction of unintentional radiated emission from 10-wire power cable using for power li
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Imbalance difference model for prediction of unintentional radiated emission from 10-wire power cable using for power line communication Tohlu Matsushima1
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Hiroyuki Okumura1 • Nobuo Kuwabara1 • Yuki Fukumoto1
Accepted: 1 October 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Electromagnetic fields unintentionally radiated from power-line communications used in factories interfere with wireless communications. It is important to distinguish the mechanism of this undesired and unintentional radiation from that of wired communication as it affects wireless communications. In particular, unintentional radiated emissions should be reduced in order to construct a stable wired/wireless communication network. This paper focuses on power-line communication as it is used in a factory. The power distribution network in the factory consists of multiple cables bundled together. The effects of cables other than the power cable that applies the communication signal to the radiated electromagnetic field are investigated. Some of the signal power reaching the reciever is converted into common-mode current by an imbalance mismatch. The common-mode current is one of the main causes of unwanted electromagnetic radiation. To predict this conversion, an imbalance difference model is created to account for multi-conductor transmission lines such as those in the power distribution network of the factory. The proposed model can calculate the amount of common-mode excitation associated with changes in the load condition of the power lines. To verify the proposed method, the authors measured the change in common-mode current due to the difference in pairs of power lines to which the signal is applied. The calculation using the proposed model could estimate the amount of reduction in common-mode current to within an error of 1 dB. Keywords Power line communication (PLC) Common-mode current Multi-cable effect Unintentional radiated emission Electromagnetic compatibility (EMC)
1 Introduction The use of the Internet of Things (IoT) is growing in factories where it is used for communications with industrial equipment such as mounting machines and for collecting various information [1]. Wireless communication systems
& Tohlu Matsushima [email protected] Hiroyuki Okumura [email protected] Nobuo Kuwabara [email protected] Yuki Fukumoto [email protected] 1
Kyushu Institute of Technology, Kitakyushu, Japan
such as 5G are the communication tools of industrial machines [2]. By using radio waves in a high-frequency band, it is possible for communications not to be affected by external electromagnetic noise. However, due to the straight paths of electromagnetic waves, it is not possible to secure a sufficient access area where mounting machines or carrier robots block the path of the radio waves. Moreover, attenuation by walls is a serious issue. There are other forms of wireless communications, such as W
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