US 12,461,128 B2
Current sensor
Hiroki Minami, Hachioji (JP); and Hiroyuki Ishida, Hachioji (JP)
Assigned to Yokogawa Electric Corporation, Tokyo (JP); and Yokogawa Test & Measurement Corporation, Tokyo (JP)
Filed by Yokogawa Electric Corporation, Musashino (JP); and Yokogawa Test & Measurement Corporation, Hachioji (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/343,220.
Claims priority of application No. 2022-110063 (JP), filed on Jul. 7, 2022.
Prior Publication US 2024/0012033 A1, Jan. 11, 2024
Int. Cl. G01R 15/20 (2006.01); G01R 19/00 (2006.01)
CPC G01R 15/202 (2013.01) [G01R 15/207 (2013.01); G01R 19/0092 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A current sensor comprising:
a magnetic core that can be arranged to surround a conducting wire through which a current to be measured flows;
a plurality of magnetic sensors each configured to detect magnetic flux in a predetermined portion of the magnetic core;
a plurality of amplifiers arranged in correspondence with the plurality of magnetic sensors;
a plurality of feedback coils arranged in correspondence with the plurality of magnetic sensors; and
a current detector configured to detect the current to be measured based on a current yielded by combining currents flowing through each of the plurality of feedback coils, wherein
each of the plurality of amplifiers is configured to amplify an output of the corresponding magnetic sensor and output a current corresponding to the output of the corresponding magnetic sensor,
each of the plurality of feedback coils is wound around the magnetic core and passes the current outputted by the corresponding amplifier in a direction that cancels the corresponding magnetic flux in the predetermined portion of the magnetic core,
the plurality of magnetic sensors is arranged at equal angles as viewed from a center of the magnetic core, and
the plurality of feedback coils, which correspond to a plurality of portions of the magnetic core of which the plurality of magnetic sensors detect a magnetic flux, is arranged at equal angles as viewed from the center of the magnetic core.