Wireless power transfer system for radiative noise reduction with combined power supply and transmission coil

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K14959
• 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, 工学研究科, 助教 (40826202)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: ワイヤレス給電 / 非接触給電 / 漏えい電磁界 / 伝送コイル / インバータ / CISPR / ICNIRP / EMC

Outline of Final Research Achievements

In this project, a wireless power transfer (WPT) system for electric vehicles has been developed. The high-power WPT system emits a strong magnetic field owing to its operation principle from both the transmission coils and cables between a high-frequency power supply and the transmission coils. The magnetic field emission must be reduced because the magnetic field may interfere electrical equipment and radio communication nearby the system.
In order to solve the above problem, integration technology of the power supply and the transmission coils has been developed in this project. The magnetic field emission is reduced because a high-frequency current does not flow on the cable due to the integration.
The electromagnetic compatibility of the 22-kW prototype had been evaluated in a 10-m anechoic chamber in Nagaoka, Niigata. The measurement results show that the prototype fully satisfies the international guidelines (CISPR 11, Class A, Group 2).

Free Research Field

パワーエレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

漏えい電磁界は，システム周辺の電子機器や無線通信障害の原因となりうるため，電子機器の製品化にあたって遵守しなければならない国際的な基準が定められている。ワイヤレス給電システムは原理上漏えい電磁界の発生を妨げられないため，大電力化は困難とされていた。本研究の成果により，22kWワイヤレス給電システムにおいても，漏えい電磁界に関する国際的な基準を余裕をもって満足することが実証された。