Development of equivalent circuit model required for low-noise designing of safe and secure electrical/electronic equipment

2020 Fiscal Year Final Research Report

• Project/Area Number: 16H04318
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Okayama University
• Principal Investigator: Toyota Yoshitaka 岡山大学, 自然科学研究科, 教授 (20311798)
• Project Period (FY): 2016-04-01 – 2021-03-31
• Keywords: 等価回路モデル / 低ノイズ設計 / 平衡度整合 / 伝送線路 / ノイズ源モデル / モード変換

Outline of Final Research Achievements

This project mainly confirmed the validity of a modal equivalent-circuit model I had proposed. In terms of the differential transmission line, the design procedure of a tightly coupled asymmetrically tapered bend was established, a methodology for reducing the differential skew on a meshed structure such as a board’s glass cloth was proposed, and a crosstalk mitigation by introducing a periodic structure and its mechanism clarification were carried out. Regarding the connector and its surroundings, mode conversion at the connector was suppressed by improving the board pattern and an estimation method of the connector’s imbalance factor was proposed. In addition, a noise-source equivalent-circuit model of DC/DC convertor was developed and validated for predicting the voltage of the conducted disturbance quantitatively.

Free Research Field

環境電磁工学

Academic Significance and Societal Importance of the Research Achievements

小型化，高密度実装などによりしばしば生じるモード変換は，線路設計上で重要な信号完全性（SI），電磁環境両立性（EMC）への影響が甚大であるが，従来の電気回路・伝送線路の両理論では扱うことができない。「平衡度整合」の概念を導入した本研究の成果は，従来理論と電磁気学の間を埋める新たな理論体系の構築に役立つ。さらに，実際の設計において問題となるモード変換やクロストークなどを対象に，現場エンジニアに理解しやすいよう具体的事例を用いて本研究成果の実用上の有効性を示した。