研究者詳細 - 松嶋　徹

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Calculation of Radiated Emission from STP Cable by Chain-Parameter-Matrix 査読有り

Kuwabara N., Matsushima T., Fukumoto Y.

2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021 1087 - 1092 2021年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Radiated emission from shielded twisted pair (STP) cable was calculated using a chain-parameter-matrix. The series connection of the matrix represented the transmission line inside the shield, and the common-mode (CM) current was obtained by solving the matrix equation. The induction voltage on the outside of the shield was determined from the CM current using the shield's transfer impedance. The current on the outside of the shield was calculated from this induction voltage. And then, the radiated electric field was calculated from this current. The matrix elements representing the transmission line between conductors and shield were determined from the measurement, and the transfer impedance was also determined from the measurement. The line constants between shield and ground were determined from the theory by assuming the shield as a copper rod. The maximum current on the outside of the shield and the maximum radiated electric field were measured in the frequency range from 30 MHz to 300 MHz, and these were compared to the calculated value. The calculation results of the maximum current intensity were well agreed with the measured value, and the calculation results of the maximum radiated electric-field strength were almost agreed with the measured value.

DOI： 10.1109/EMC/SI/PI/EMCEurope52599.2021.9559295

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Simulation of mode division multiplex transmission method in shielded four-wire cable 査読有り

Matsushima T., Sato T., Fukumoto Y., Kuwabara N.

2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021 570 - 574 2021年07月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A mode division multiplex transmission system that assigns signals to the eigenmodes of a transmission line was proposed for a cable that is uniform in the longitudinal direction. The transmission characteristics when the proposed method is used in a 1m long shielded untwisted 4-wire cable were verified by circuit simulation. It is shown that the proposed method enables four-channel simultaneous transmission. In addition, the proposed method significantly improves the crosstalk compared to the differential and single-ended transmission methods.

DOI： 10.1109/EMC/SI/PI/EMCEurope52599.2021.9559178

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不平衡度制御によるLVDSのコモンモード低減法査読有り

和田修己, 齊藤大晃, 矢野佑典, 久門尚史, 松嶋徹

電子情報通信学会論文誌B 通信 ( 電子情報通信学会 ) J104-B ( 6 ) 453 - 460 2021年06月

記述言語：日本語掲載種別：研究論文（学術雑誌）

LVDS (Low Voltage Differential Signaling)ドライバが電流差動駆動系であることに着目し，完全平衡ではない伝送系をLVDSドライバで駆動した際に発生するコモンモードを低減する手法を提案する．抵抗による簡単な平衡度補正回路の追加により不平衡系のコモンモードを低減する．シミュレーションと実験により，不平衡度が0.5から大きくずれた系においても，大幅にコモンモード発生量を低減することが可能であることを示す．LVDSドライバと平衡度補正を用いた準差動伝送系について，実験によりコモンモード電位変動の低減を確認した．

DOI： 10.14923/transcomj.2020pep0007

Evaluation of influence to electromagnetic environment on outside of building by PLC system using three-wire three-phase power line 査読有り

Wakisaka T., Matsushima T., Koga H., Okumura H., Kuwabara N., Fukumoto Y.

Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) 214 ( 2 ) 2021年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, the influence to electromagnetic environment was evaluated on the outside of buildings where power line communication (PLC) systems were installed to a three-wire three-phase power distribution line. The electric field strength was measured at 140 points in five factories, in two office buildings, and in one stadium. Since many radio waves existed in the environment, the electric field strength when PLC system was operated and was not operated was measured. The influence was evaluated by the cumulated occurrence probability because the frequency characteristics of the electric filed strength changed by the measurement points. The results showed that the occurrence probability was not changed when the PLC system was operated and was not operated. The electric field strength was calculated by the common mode current obtained from the test result, and this indicated that the occurrence probability was lower than the measured occurrence probability of electric field strength.

DOI： 10.1002/eej.23324

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Equivalent Circuit of Common-Mode Choke Coil Considering with Conversion from Differential-Mode Signal to Common-Mode Disturbance 査読有り国際誌

Kuwabara N., Matsushima T., Fukumoto Y.

2021 13th International Workshop on the Electromagnetic Compatibility of Integrated Circuits, EMC Compo 2021 59 - 64 2021年03月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A common-mode choke coil (CMC) is an essential device for achieving electromagnetic compatibility (EMC). An equivalent circuit considering the common-mode (CM) disturbance converted from differential-mode (DM) signal is needed because the spectrum of telecommunication signals overlaps with the regulated frequency band of the radiated disturbance due to the increase of telecommunication speed in recent years. In this paper, an equivalent circuit of CMC considering the conversion phenomenon is proposed. The admittances were inserted between each terminal of the CMC and the ground for demonstrating the phenomenon. The SPICE model of CMC was represented by the combination of the ABCD chain-parameter-matrices, and the elements of the overall matrix were calculated. The mixed-mode S-parameters were calculated using these elements. The elements of the ABCD matrix and the mixed-mode S-parameters were measured and the admittance values were determined by comparing the calculated data with the measured data. The pulse response calculated by the proposed equivalent circuit was well agreed with the measurement value.

DOI： 10.1109/EMCCompo52133.2022.9758620

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Evaluation of influence to electromagnetic environment on outside of building by PLC system using three‐wire three‐phase power line 査読有り

Wakisaka Toshiyuki, Matsushima Tohlu, Koga Hisao, Okumura Hiroyuki, Kuwabara Nobuo, Fukumoto Yuki

Electrical Engineering in Japan ( Wiley ) 214 ( 2 ) 2021年02月

Experimental investigation of communication quality degradation of 1000BASE-T1 by pulse disturbance 査読有り

Yano Yusuke, Matsushima Tohlu, Wada Osami

IEICE Communications Express ( 一般社団法人電子情報通信学会 ) 9 ( 12 ) 593 - 598 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Adverse effect of pulse disturbances on the communication quality is investigated experimentally on in-vehicle Ethernet (1000BASE-T1, IEEE 802.3bp). Common- and differential-mode pulse disturbances were injected into communication cables by a method referring to the coupling network described in IEC 62228-5. As a result, it was revealed that steep change of differential signal due to pulse disturbance degrades the communication quality at a specific pulse width.

DOI： 10.1587/comex.2020COL0019

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Evaluation of influence to electromagnetic environment on outside of building by PLC system using three-wire three-phase power line 査読有り

Wakisaka T., Matsushima T., Koga H., Okumura H., Kuwabara N., Fukumoto Y.

IEEJ Transactions on Fundamentals and Materials ( 一般社団法人電気学会 ) 140 ( 12 ) 557 - 564 2020年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）

© 2020 The Institute of Electrical Engineers of Japan. In this paper, the influence to electromagnetic environment was evaluated on the outside of buildings where power line communication (PLC) systems were installed to a three-wire three-phase power distribution line. The electric field strength was measured at 140 points in five factories, in two office buildings, and in one stadium. Since many radio waves existed in the environment, the electric field strength when PLC system was operated and was not operated was measured. The influence was evaluated by the cumulated occurrence probability because the frequency characteristics of the electric filed strength changed by the measurement points. The results showed that the occurrence probability was not changed when the PLC system was operated and was not operated. The electric field strength was calculated by the common mode current obtained from the test result, and this indicated that the occurrence probability was lower than the measured occurrence probability of electric field strength.

DOI： 10.1541/ieejfms.140.557

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Evaluation of the magnetic field strength by using a scale model for power line communication 査読有り

Dai-ichiro Koike, Hiroyuki Okumura, Tohlu Matsushima, Yuki Fukumoto

International Conference on Emerging Technologies for Communications 2020年12月

TDR simulation using equivalent circuit of actual power distribution network to detect ground fault 査読有り国際誌

Fumikazu Kobayashi, Tohlu Matsushima, Yuki Fukumoto

International Conference on Emerging Technologies for Communications 2020年12月

Differential-/Common-Mode Conversion Loss and LCL/TCL Measurement Methods 査読有り

Matsushima T., Sugiura A., Wada O.

IEEE Transactions on Electromagnetic Compatibility 62 ( 5 ) 1830 - 1839 2020年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 1964-2012 IEEE. In wired signal transmission, conversion between the differential and common modes deteriorates the quality of the transmitted signal and also causes electromagnetic compatibility problems in the environment. Therefore, the transmission-line components are requested to be tested on their conversion loss characteristics, such as the longitudinal conversion loss (LCL), transverse conversion loss (TCL), and mixed-mode S-parameters. Theoretical investigations are carried out to analyze the mode conversion of a differential one-port device in order to express the conversion loss parameters in terms of the modal impedances of the device. Consequently, the mutual relationships among the parameters are derived using the modal impedances. In addition, a new LCL measurement method is proposed that can accurately determine LCL values of a device under test by using a vector network analyzer instead of a traditional balun-transformer measuring instrument. Furthermore, it is found that the ratio of the TCL to LCL is not constant but varies with device characteristics. Therefore, a new definition of the TCL is proposed in place of the conventional one. The validity of these theoretical results is confirmed through SPICE simulation and measurements.

DOI： 10.1109/TEMC.2019.2958935

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Analysis of Cable Length Dependency on Common Mode Current by Using Scale Model for Power Line Communication 査読有り

Koike D.I., Okumura H., Matsushima T., Fukumoto Y., Kuwabara N.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. Power line communication (PLC) is the technology that uses a power line as a signal line. Because an imbalance of the power line is generally larger than that of the communication line, we should take care of radiated emission from the PLC cable. A small-scale model can be applied to evaluate easily the radiated emission from PLC cables for large structures. In a scale model, all structures in the PLC system need to be manufactured as 1/n size to satisfy complete equivalence between the reference model and its scale model, though it is difficult to fabricate the fine structure such as conductors in a cable smaller. Therefore we investigated the effect on common-mode current when some parameters of the scale model were not scaled down perfectly. As a result, a reliable scale model was obtained to evaluate peak common-mode currents in resonant frequency even if some parameters of the structure were incompletely scaled. Furthermore, the cable length dependency of common-mode current was evaluated experimentally by using the scale model.

DOI： 10.1109/EMCEUROPE48519.2020.9245868

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Investigation of Multi-Cable Effect to Radiated Emission from Cable Used for Power Line Communication 査読有り

Matsushima T., Okumura H., Kuwabara N., Iwasaki M., Koike D.I., Fukumoto Y.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. The radiated emission of the power line communication (PLC) system should be investigated to maintain electromagnetic compatibility. Recently, the development of applying the PLC system to factories and offices was started. In these environments, many cables are arranged in the cable tray. Therefore, the multi-cable effect should be investigated. In this paper, the multi-cable effect was examined by using the scale model. The 0.5 times scale model was constructed in the semi-anechoic chamber, and the maximum common-mode (CM) current was measured by changing position along with the cable. The measured result was agreed with the result using the full-size original model. The experiment by using five cables suggested that the influence by the conductive loss and the dielectric loss of cable was not large for the maximum CM current, and the CM current was dominated by the cancellation effect of the in-phase currents flowing on the cables. The investigation for dependency of the position of the signal apply was indicated that the effect can be roughly estimated from the current division factor.

DOI： 10.1109/EMCEUROPE48519.2020.9245704

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Cancellation of common-mode excitation by SCD21and SCC21of CMF due to phase relationship between DM and CM voltages 査読有り

Matsushima T., Kikuchi K., Ishibashi K., Fukumoto Y., Kuwabara N.

Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020 2020年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. In this paper, reduction effect of a common-mode filter is discussed. When the performance of a common-mode filter is evaluated, it is necessary to consider not only SCC21 but also SCD21. Using these two parameters, the common-mode current flowing on the secondary side of the common-mode filter was formulated. Common-mode current is a summation of two causes: common-mode transmission and differential mode conversion from a signal source. The common-mode current depends on not only the phase relationship between SCC21 and SCD21 of the common-mode filter but also the phase relationship between the differential mode and the common mode of the signal source. Even if the same common-mode filter is used on a differential signaling system, the common-mode current increases or decreases depending on the phase of the differential mode voltage and the common-mode voltage at the signal source.

DOI： 10.1109/EMCEUROPE48519.2020.9245809

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Method of implementing radiation resistance to analysis model for radiated emission using chain parameter matrix 査読有り

Kuwabara Nobuo, Matsushima Tohlu, Fukumoto Yuki

IEICE Communications Express ( 一般社団法人電子情報通信学会 ) 9 ( 9 ) 446 - 450 2020年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

The analysis method using the chain parameter matrix (F-matrix) has been proposed for calculating radiated emission from the cable used by power line communication (PLC). In this paper, the radiation resistance was implemented to the F-matrix as the load of the common mode current which was converted from the differential mode PLC signal by the unbalance of the transmission system and was considered as the emission source. The calculated result for the simple cable model was compared to the measurement value and to the calculation value of which the radiation resistance was not considered. The investigation result indicated that the influence of radiation resistance appeared at the frequency where the high radiated emission was observed.

DOI： 10.1587/comex.2020XBL0070

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実規模配電系統での事故点標定のための電柱径間長に対応できる分解能を持つTDR測定査読有り

大恵慎平, 上嶋宏明, 笹岡毅志, 松嶋徹, 久門尚史, 和田修己

電気学会論文誌Ｂ（電力・エネルギー部門誌） ( 一般社団法人電気学会 ) 140 ( 9 ) 662 - 667 2020年09月

記述言語：日本語掲載種別：研究論文（学術雑誌）

The authors propose a new and more efficient method to search for fault points by injected short pulse with high frequency into distribution line. This method, which is called as TDR measurement, enables to find the fault point easily by measuring propagation time of the pulse reflected due to impedance change at the fault point. In this paper, the proposed method is experimented in real-scale distribution system with about 700m distance which is isolated by DAS (Distribution Automation System) as outage area. The measurement result shows that an injected pulse with corresponding to utility pole span resolution is able to propagate through about 700m distance, and each reflected wave by several brunches and terminals is observed clearly in the real-scale distribution system. And the measurement result corresponds with the simulation result of the test equivalent circuit model. Moreover, the authors measured reflected waves from a fault point (short circuit, broken wire, or grounding) in test circuit. As the results, reflected waves from every fault point were confirmed by simulation, and they depend on the fault type. We calculated the fault location from the pulse velocity and the propagation time of the reflected wave, and the result nearly corresponded to the actual setting. In addition, the measured wave corresponds to the simulation result using equivalent circuit model of each fault point.

DOI： 10.1541/ieejpes.140.662

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Measurement of throughput degradation due to pulse disturbance in power line communication 査読有り国際誌

Kyoko Kadoyoshi,Kazumasa Oshikawa,Toshiyuki Wakisaka,Tohlu Matsushima,Yuki Fukumoto

In 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE 2020年09月

Influence of S_{{cd}21} Characteristics of Common-Mode Filter on Radiated Emission from UTP Cable 査読有り

Kikuchi K., Matsushima T., Ishibashi K., Kuwabara N., Fukumoto Y.

2020 IEEE International Symposium on Electromagnetic Compatibility and Signal/Power Integrity, EMCSI 2020 386 - 391 2020年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. The common-mode filter (CMF) is a key device for suppressing emissions radiated from telecommunication cables. Recent serial interfaces deliver the necessity of considering that common-mode (CM) disturbances are converted from the differential mode (DM) telecommunication signals by a CMF. To examine this phenomenon, this study investigated the S_{\text{cd}21} characteristic, which is one of the mixed-mode S-parameters. Two types of CMFs whose S_{\text{cd}21} were different were examined. A signal was supplied to an unshielded twisted pair (UTP) cable through the CMF. The emission from the cable was measured using a setup complying with CISPR 25. Then, the relationship between the ratio of CM to DM signals and the emission level was investigated. The results showed that the emission level decreased as a result of employing the lower S_{\text{cd}21} CMF and that the emission level was linearly proportional to the ratio of the CM to DM signals. The results indicate that {S}_{\text{cd}21} is an essential parameter with which to evaluate CMFs used in telecommunication ports of serial interfaces.

DOI： 10.1109/EMCSI38923.2020.9191645

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Measurement of Differential Mode Impedance and Longitudinal Conversion Loss for In-Factory High-Speed PLC System using Three-Phase Power Distribution System 査読有り

Wakisaka T., Matsushima T., Okumura H., Koga H., Kuwabara N., Fukumoto Y.

2020 IEEE International Symposium on Power Line Communications and its Applications, ISPLC 2020 2020年05月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. The differential mode impedance (DMZ) and the longitudinal conversion loss (LCL) are important parameters to introduce high-speed power line communication (PLC) systems. Therefore, we should evaluate the DMZ and LCL in a factory environment because the three-phase power distribution system has been employed in factories. The admittance matrix elements at the power distribution board were determined from S-parameter measured with a vector network analyzer. An isolation probe was developed to measure S-parameters under high voltage applying conditions. Measurements were carried out at 60 points in 4 factories. The admittance matrix was represented by the equivalent circuit composed by six impedances, then the DMZ and the LCL were calculated from the mean value of the impedances. The results showed that the absolute value of DMZ was lower than the characteristic impedance of the PLC transmission line, and the LCL value was similar to the LCL in house environment where a two-phase power distribution system was employed.

DOI： 10.1109/ISPLC48789.2020.9115393