ワイヤレス電力伝送システムに向けた超電導ダイオードの研究開発 ―NEDO 未踏プロジェクトの成果と今後の展望―

書誌事項

タイトル別名
  • Novel Superconducting Devices for Wireless Power Transmission Systems Development of Superconducting Diodes

抄録

<p>We proposed a superconducting diode as a novel superconducting device for the power receiver of wireless power transmission in the space solar power system (SSPS), which is expected to be a renewable energy source in the future. In order to realize efficient power reception and rectification for wireless power transmission, we investigated the deposition method of MgB2 film as a suitable material for superconducting diodes, the surface planarization process to improve rectification efficiency, and an evaluation method for rectification in superconducting diodes at high frequency in the microwave range. We present the basic concept of the superconducting diodes after explaining the theory on surface barrier to the flux quantum in superconductors. Earlier studies of various superconducting diodes are also reviewed.</p><p>As results of this project, MgB2 films were prepared by the pulsed laser deposition using a Nd:YAG laser with in-situ post annealing process. The film shows Tconset = 33.6 K and Jc = 0.9×106 A/cm2 at 20 K and under self-field. The surface planarization of REBa2Cu3Oy films increased the rectification rate up to 145 % compared to the untreated sample due to the enhancement of the surface barrier. Wet polishing with loose abrasives is promising for the surface planarization of the films. We established a test facility of superconducting diode to explore for a wide range of frequencies from 60 Hz to 80 MHz and confirmed the rectification at frequencies up to 80 MHz in the REBa2Cu3Oy films. In the future, it is expected that we will fabricate superconducting diodes using the MgB2 films, develop a polishing technique for mass production, and develop a rectification test method at a microwave frequency of 5.8 GHz. Furthermore, it is desirable to fabricate a rectenna with a superconducting diode built into the antenna, and to develop a device with the functions of high-efficiency power reception, rectification, and storage of microwaves for wireless power transmission including the SSPS.</p>

収録刊行物

  • 低温工学

    低温工学 57 (6), 349-361, 2022

    公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

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