US 11,892,477 B2
Current sensor having soft magnetic bodies for adjusting magnetic field intensity
Yuta Saito, Tokyo (JP); Kenichi Takano, Tokyo (JP); and Hiraku Hirabayashi, Tokyo (JP)
Assigned to TDK Corporation, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Mar. 4, 2022, as Appl. No. 17/686,965.
Application 17/686,965 is a continuation of application No. 15/997,986, filed on Jun. 5, 2018, granted, now 11,293,950.
Claims priority of application No. 2017-116113 (JP), filed on Jun. 13, 2017.
Prior Publication US 2022/0187344 A1, Jun. 16, 2022
Int. Cl. G01R 15/20 (2006.01); G01R 19/00 (2006.01); G01R 33/09 (2006.01)
CPC G01R 15/205 (2013.01) [G01R 19/0092 (2013.01); G01R 33/093 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A current sensor, comprising:
a magneto-resistive effect element which is arranged near a current line, to which a signal magnetic field is applied, the signal magnetic field being induced by a current that flows in the current line, and which generates a magneto-resistive change in accordance with a change of the signal magnetic field;
cancelling magnetic field generating means that is provided near the magneto-resistive effect element and that generates a cancelling magnetic field that cancels the signal magnetic field;
a first soft magnetic body that is provided between the magneto-resistive effect element and the current line; and
a pair of second soft magnetic bodies that are provided on both sides of the magneto-resistive effect element with regard to a magnetization detecting direction of the magneto-resistive effect element, wherein
a distance in the magnetization detecting direction between a center of the first soft magnetic body and a part of each second soft magnetic body that is most distant from the center of the first soft magnetic body is smaller than a distance in the magnetization detecting direction between the center of the first soft magnetic body and each end of the first soft magnetic body.