Title:
ELECTRIC CURRENT SENSOR AND MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/098751
Kind Code:
A1
Abstract:
The objective of the invention is to output a signal via a transmission path with little attenuation, while eliminating high-frequency noise.
This electric current sensor is provided with: a coil 5 which is wound around a magnetic core 2 through the interior of which an electrical path being measured 21 is inserted, one end 5a of the coil 5 being connected to a ground G side, and the other end thereof outputting an electric current I2 corresponding to the current value of a current being measured I1 flowing through the electrical path being measured 21; a constant-impedance filter 7, an input terminal 7a of which is connected to the other end 5b of the coil 5, and which restricts the frequency domain of the electric current I2, input from the input terminal 7a, to a desired frequency domain, and outputs said electric current I2 from an output terminal 7b; a transmission path 8, one end 8a of which is directly connected to the output terminal 7b of the filter 7; and a termination resistor 9 which is connected between the other end 8b of the transmission path 8 and the ground G, and which converts the electric current I2 flowing through the transmission path 8 into a detection voltage V2. The impedance of the filter 7 as seen from the input terminal 7a toward the termination resistor 9 is defined to be the same as the characteristic impedance of the transmission path 8.
Inventors:
HARANO MASAYUKI (JP)
Application Number:
PCT/JP2015/084998
Publication Date:
June 23, 2016
Filing Date:
December 15, 2015
Export Citation:
Assignee:
HIOKI ELECTRIC WORKS (JP)
International Classes:
G01R15/18
Foreign References:
| JPH10185962A | 1998-07-14 | |||
| JPH11505677A | 1999-05-21 |
Attorney, Agent or Firm:
SAKAI, SHINJI (JP)
Shinji Sakai (JP)
Shinji Sakai (JP)
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