High-frequency power supply for wireless power transfer systems without harmonics components of radiated emission

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14139
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Kusaka Keisuke 長岡技術科学大学, 産学融合トップランナー養成センター, 特任講師 (40826202)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: ワイヤレス給電 / 漏えい磁界 / マルチレベルインバータ / 線形増幅

Outline of Final Research Achievements

Wireless power transfer systems convert electrical energy into magnetic energy temporarily in order to transmit power wirelessly. Therefore, it is difficult to prevent the occurrence of leakage magnetic fields around the transmission coil.
In this study, we developed a high-frequency power supply system for wireless power transfer systems that is capable of outputting sinusoidal voltages. This circuit is capable of outputting a sinusoidal voltage by operating one of the semiconductor switches in the multilevel inverter circuit as a linear amplifier. This makes it possible to suppress the harmonic components of the leakage magnetic field that may interfere with other wireless devices.
We developed a high-frequency power supply system using a multilevel inverter and demonstrated that the harmonic components of the leakage magnetic field can be suppressed.

Free Research Field

電力工学

Academic Significance and Societal Importance of the Research Achievements

ワイヤレス給電システムから生じる漏えい磁界は，伝送コイル周辺に設置された電子機器の誤動作や，無線通信機器への妨害を与えることが知られており，ワイヤレス給電システム普及に向けては必ず解決しなければならない問題である。本成果により，伝送コイルから生じる漏えい磁界の高調波成分を抑制することが可能となったことから，周辺の機器へ影響を与えることなくワイヤレス給電システムの実現が可能となった。またこれは，ワイヤレス給電システムのさらなる大電力化にも対応可能であることを示唆している。