研究者詳細 - 福本　幸弘

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Transmission line pulse method with arbitrary characteristic impedance for immunity evaluation of ESD protection device 査読有り

Tanaka K., Matsushima T., Fukumoto Y.

2021 IEEE CPMT Symposium Japan, ICSJ 2021 21 - 24 2021年01月

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

In a conventional TLP system, the pulse disturbance is applied to the DUT via the transmission line, whose characteristic impedance is 50 Ω. However, the DUT for the evaluation, such as an ESD protection device, may be affected by the transmission line’s characteristic impedance. This paper adds an impedance matching circuit to the conventional 50 Ω TLP system, making it possible to adjust the circuit to an arbitrary value of the transmission line’s characteristic impedance. By using the developed system, the IV characteristics of an ESD protection device are evaluated when the characteristic impedance is 20 Ω, 50 Ω, and 150 Ω. As a result, it was found that the negative resistance characteristics after the breakdown voltage change depending on the transmission line’s characteristic impedance.

DOI： 10.1109/ICSJ52620.2021.9648864

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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

Kuwabara N., Matsushima T., Fukumoto Y.

2021 13th International Workshop on the Electromagnetic Compatibility of Integrated Circuits, EMC Compo 2021 59 - 64 2021年01月

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

A 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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Imbalance difference model for prediction of unintentional radiated emission from 10-wire power cable using for power line communication 査読有り国際誌

Tohlu Matsushima, Hiroyuki Okumura, Nobuo Kuwabara, Yuki Fukumoto

Wireless Networks 2020年10月

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

Tohlu Matsushima, Hiroyuki Okumura, Nobuo Kuwabara, Miuto Iwasaki, Dai Ichiro Koike, Yuki Fukumoto

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）

Italy

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 査読有り国際誌

Tohlu Matsushima, Koichi Kikuchi, Kenta Ishibashi, Yuki Fukumoto, Nobuo Kuwabara

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）

Italy

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

Dai Ichiro Koike, Hiroyuki Okumura, Tohlu Matsushima, Yuki Fukumoto, Nobuo Kuwabara

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）

Italy

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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Influence of Scd21 Characteristics of Common-Mode Filter on Radiated Emission from UTP Cable 査読有り国際誌

Koichi Kikuchi, Tohlu Matsushima, Kenta Ishibashi, Nobuo Kuwabara, Yuki Fukumoto

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

USA

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. 査読有り国際誌

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

IEEE ISPLC 2020年04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）

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

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三相3線電力線を使用したPLC通信システムが建物外の電磁環境に与える影響の評価査読有り

脇坂俊幸, 松嶋徹, 古賀久雄, 奥村浩幸, 桑原伸夫, 福本幸弘

電気学会論文誌．　Ａ ( 一般社団法人電気学会 ) 140 ( 12 ) 557 - 564 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：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： 10.1541/ieejfms.140.557

その他リンク： https://ci.nii.ac.jp/naid/130007948596

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01月

担当区分：責任著者記述言語：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

その他リンク： https://ci.nii.ac.jp/naid/130007895332

九州工業大学工学部電気電子学科福本・松嶋研究室

福本幸弘, 松嶋徹

エレクトロニクス実装学会誌 ( 一般社団法人エレクトロニクス実装学会 ) 22 ( 7 ) 622 - 622 2019年11月

Characteristics of Radiated Emission by PLC Signal from Three-wire Power Cable 査読有り国際誌

Nobuo Kuwabara, Yuki Fukumoto, Tohlu Matsushima, Hiroyuki Okumura

EMC Europe 2019 267 - 272 2019年09月

Characteristics of Radiated Emission by PLC Signal from Three-wire Power Cable 査読有り

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

EMC Europe 2019 - 2019 International Symposium on Electromagnetic Compatibility 267 - 272 2019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）

Characteristics of radiated emission from the three-wire power cable where the power line communication signal was transmitting was studied by using circuit theory. The simple model whose length was 14.4m was used for the investigation, and the radiated emission was calculated and measured. The average deviation between the calculated data and the measured data was -3.6dB and the standard deviation was 3.3dB. The calculation results indicated that the maximum magnetic field strength could be estimated from the maximum common-mode current. The analysis also suggested that the maximum common-mode current of a three-wire cable was less than that of a two-wire cable in many cases.

DOI： 10.1109/EMCEurope.2019.8872015

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Evaluation of EM emission from a wire with common mode filter considering mode-conversion 査読有り国際誌

Koichi Kikuchi, Masaharu Kondo, Tohlu Matsushima, Yuki Fukumoto, Nobuo Kuwbara

2019 IEEE International Symposium on Electromagnetic Compatibility, Signal & Power Integrity (EMC+SIPI) 2019年07月

Statisitical Investigation of Radiated Emissions from PLC System Connected to 3-Phase Power Lines in Factories 査読有り国際誌

Toshiyuki Wakisaka, Tohlu Matsushima, Hisao KOGA, Naohiro Kawabata, Nobuo kuwabara, Yuki Fukumoto

APEMC 2019 & EMC Sapporo 2019年06月

Calculation of Electromagnetic Field Radiated from Power Line Communication of Three Wires System 査読有り国際誌

Takeshi Yamamoto, Tohlu Matsushima, Nobuo kuwabara, Yuki Fukumoto, Hiroyuki Okumura, Toshiyuki Wakisaka

APEMC 2019 & EMC Sapporo 2019年06月

Calculation of Electromagnetic Field Radiated from Power Line Communication of Three Wires System 査読有り

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

2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019 704 - 707 2019年06月

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

Electromagnetic field radiated from Power Line Communication (PLC) which was applied to three wires system was examined with Method of Moments (MoM). The influence of the wire configuration and the terminating condition of the third wire was also evaluated. Calculated common mode current and electromagnetic field intensity agreed well with measured results. The calculation results showed that electromagnetic field intensity decreased or didn't change from two wires system when the third wire was connected to the ground.

DOI： 10.23919/EMCTokyo.2019.8893771

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Experimental study of the relationship between maximum common mode current and maximum magnetic field strength using a simple power distribution line model 査読有り

Okumura Hiroyuki, Matsushima Tohlu, Kuwabara Nobuo, Yamamoto Takeshi, Wakisaka Toshiyuki, Fukumoto Yuki

IEICE Communications Express ( 一般社団法人電子情報通信学会 ) 8 ( 5 ) 178 - 183 2019年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The relation between maximum common mode current and maximum radiated magnetic field strength was experimentally studied using a simple power distribution line model. The common mode current was measured along the cable and the radiated magnetic field strength was measured around the model. They were evaluated using the S21 parameter. The frequency characteristic of both the maximum current and the maximum strength showed a closely similar pattern. Our evaluation of their correlation indicated that the relation between the maximum common mode current and the maximum radiated magnetic field strength could be represented by a straight line, and that 80% of the measured data was contained within 2 dB of the regression line.

DOI： 10.1587/comex.2019XBL0004

その他リンク： https://ci.nii.ac.jp/naid/130007641560

電力線通信の長距離化に向けた電力ケーブルの透過特性測定

小原総一郎, 小林史和, 押川和正, 脇坂俊幸, 松嶋徹, 福本幸弘

産業応用工学会全国大会講演論文集 ( 一般社団法人産業応用工学会 ) 2019 ( 0 ) 41 - 41 2019年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（研究会，シンポジウム資料等）

現在，500mを超える長距離区間で電力線通信(PLC)を使うケースが増えている。そのため電力線ケーブルの高周波透過特性を調べることが必要である。本報告ではVVFケーブルとEEFケーブルの透過特性を測定した。全帯域を使える長さはVVFケーブルでは0.3 kmであるが，EEFケーブルでは1.5k mである。よって長距離通信ではEEFケーブルを用いることが望ましい。今後は他のケーブルも測定することでより良い透過特性を持つケーブルの検証を実施する。

DOI： 10.12792/iiae2019.022