Research on High Power Rectifier for Narrow Beam Wireless Power Transfer

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04042
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: Kyoto University
• Principal Investigator: Shinohara Naoki 京都大学, 生存圏研究所, 教授 (10283657)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ワイヤレス給電 / マイクロ波送電 / レクテナ / 整流回路

Outline of Final Research Achievements

The main purpose of this research is to develop a high-power rectifier circuit for narrow beam wireless power transfer (WPT). 1) Improving the efficiency of power rectifier circuits using conventional Schottky barrier diodes by optimizing circuit impedance, which is a methodology used in low-power rectifier circuits, and 2) High-power rectification using three-terminal semiconductors such as HEMTs, were carried out in this research. Finally a developed class R load type single shunt rectifier circuit achieved an efficiency of 74.0% and an output voltage of 14.8V at an input power of 4.22W. Furthermore, We succeeded in generating DC from a 43.6W, 5.7GHz input with a conversion efficiency of 61.9% by using a 16-element array rectenna.

Free Research Field

マイクロ波応用工学

Academic Significance and Societal Importance of the Research Achievements

近年ワイヤレス給電の実用化は結合型からwide beam型空間伝送型へと移り、さらに近い両頼narrow beam型空間伝送型へと移っていくと予想されている。そのために求められる大電力受電整流回路として世界初となるR級負荷型シングルシャント整流回路を開発し、4Wを超える大電力かつ74%の高効率を実現した本研究は学術的意義が高く、同時に今後のワイヤレス給電のさらなる実用化に高い意義を持つものである。