Development of low frequency wireless power transfer technology for multiple low power devices

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18058
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Shinshu University
• Principal Investigator: BU Yinggang 信州大学, 学術研究院工学系, 准教授 (70647940)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: ワイヤレス充電 / 低周波数トランス

Outline of Final Research Achievements

In this research, we proposed a unique wireless power transmission structure only using low frequency AC power directly from 50/60Hz electrical power line, that power supply to an electronic shelf label (ESL) which is an electrical price information device installed on the shelf to display the price of the articles for sale. As a result, high-frequency electromagnetic leakage is eliminated, and manufacturing at low cost becomes possible. We verified the feasibility to drive pluralities of ESL devices through the experiments. The maximum output power of 500 mW, when the six receiving coil devices are installed in transmitting yoke. The color liquid crystal ESL can be driven. We also proposed a switching control that can evenly output power to each power receiving ESL device. The output variation rate of the conventional method was 30.4%, and when switching control was applied, it was reduced to 5.6%. The usefulness of the proposed method was confirmed.

Free Research Field

工学　電気電子工学