Study on wireless power transmission considering polarization and position

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K06329
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: National Institute of Technology, Toyota College
• Principal Investigator: Andoh Hiroya 豊田工業高等専門学校, 情報工学科, 教授 (30212674)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: ワイヤレス電力伝送 / 偏波 / 電界結合 / 磁界結合 / S行列 / 位相 / kQ積 / 最大電力伝送効率

Outline of Final Research Achievements

In order to obtain high efficiency for wireless power system, it is important to consider the coupling of the electromagnetic fields on the transmitter and the receiver, match the planes of polarization, and improve the transfer efficiency. The S-matrix of a pair of series resonant circuits coupled via a magnetic field and the S-matrix of a pair of parallel resonant circuits coupled via an electric field are essentially the same, including three essential parameters. These important circuit parameters have also been shown to provide matching conditions on the transmitter, matching conditions on the receiver, and conditions for maximizing transmission efficiency. We also clarified how to obtain matching conditions and maximum power transfer efficiency from kQ-products by drawing a diagram with a ruler and compass.

Free Research Field

電波工学，信号処理

Academic Significance and Societal Importance of the Research Achievements

磁界結合型直列共振回路のS行列が「kQ積」と「送電側でのポートインピーダンスと共振回路内の抵抗の比」と「受電側でのポートインピーダンスと共振回路内の抵抗の比」で構成され，電界結合型並列共振回路のS行列が「kQ積」と「送電側でのポートアドミタンスと共振回路内のコンダクタンスの比」と「受電側でのポートアドミタンスと共振回路内のコンダクタンスの比」で構成され，送電側での整合条件，受電側での整合条件，電力伝送効率を最大化させるための条件がこれらの量を用いて求められるという知見を得た。また，定規とコンパスを用いて，作図により，kQ積から整合条件や最大電力伝送効率を求められることを明らかにした。