Study of Power Measurement Technologies for Wireless Power Transfer

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420396
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Measurement engineering
• Research Institution: Tokyo City University
• Principal Investigator: Kiryu Shogo 東京都市大学, 工学部, 教授 (00356908)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 非接触電力伝送 / 電力測定 / 分圧器 / 誤差解析 / 浮遊容量

Outline of Final Research Achievements

In order to develop a electric power measurement method in a frequency range from 100 kHz to 10 MHz, a voltage divider has been investigated. It was found that the voltage ratio was significantly degraded due to the stray capacitance of the resistance used in the divider. The divider should be composed from the accurate resistance whose stray capacitance is well matched. One kind of the accurate chip resistance had about 1 % variation of the stray capacitance.
A 10:1 voltage divider was manufactured with the resistances whose nominal value was 10 kΩ. Using accurate digital multi-meters, a evaluation system was constructed. The measurement values were significantly degraded at a high frequency due to the input capacitance of the meters.
In order to evaluate the effects of the input capacitance in the meter, the load effect of the meter was calculated. It was found that the 10 kΩ resistors were not suitable for the divider and the lower ( < 100 Ω ) resistance should be used.

Free Research Field

電気計測