ELECTRIC CURRENT SENSOR

WIPO Patent Application WO/2020/189444

A1

[Problem] To provide an electric current sensor having a structure whereby the electric current sensor is not readily saturated even when the amount of electric current flowing to a bus bar is extremely large. [Solution] An electric current sensor 1 is provided with a bus bar 10 through which flows an electric current to be measured, and a magnetic sensor 20 for detecting a magnetic field generated by the electric current flowing to the bus bar 10. The bus bar 10 includes a bypass bus bar 11 having a cylindrical structure, and a sensing bus bar 12 disposed in a hollow region 13 surrounded by the bypass bus bar 11. The magnetic sensor 20 is disposed in the hollow region 13. Through this configuration, a region of zero magnetic field is formed in the hollow region 13 of the bypass bus bar 11. Therefore, by arranging the sensing bus bar 12 in the region of zero magnetic field, it is possible for the magnetic sensor 20 to measure correctly without becoming saturated even when the electric current flowing to the bus bar 10 is large.

WO/2018/168981	CURRENT DETECTOR
JPS55131716	DEVICE FOR DEFORMING OR CONTROLLING SHAPE OF ELECTRIC SIGNAL
JPH0668530	[Title of Invention] High-precision transmission line electrical length measurement method

LO ADRIAN (JP)
MATSUMOTO ISAO (JP)
HORI TATSUMARO (JP)
HAMAMURA TAKAHIRO (JP)
OSADA TAKASHI (JP)
KAMI MASAFUMI (JP)

PCT/JP2020/010561

September 24, 2020

March 11, 2020

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TDK CORP (JP)

G01R15/00; G01R15/20

WO2017018306A1

2017-02-02

JP2002202328A	2002-07-19
EP1028321A2	2000-08-16
JPH0483175A	1992-03-17
US4492919A	1985-01-08
JP5971398B2	2016-08-17

See also references of EP 3940394A4

WASHIZU Mitsuhiro et al. (JP)

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