US 12,442,840 B2
Current sensor and electric device
Takahiro Taoka, Miyagi-ken (JP); Manabu Tamura, Miyagi-ken (JP); and Akira Fukui, Miyagi-ken (JP)
Assigned to Alps Alpine Co., Ltd., Tokyo (JP)
Filed by Alps Alpine Co., Ltd., Tokyo (JP)
Filed on Jul. 7, 2023, as Appl. No. 18/348,629.
Application 18/348,629 is a continuation of application No. PCT/JP2021/045463, filed on Dec. 10, 2021.
Claims priority of application No. 2021-004026 (JP), filed on Jan. 14, 2021.
Prior Publication US 2023/0349956 A1, Nov. 2, 2023
Int. Cl. G01R 15/20 (2006.01)
CPC G01R 15/207 (2013.01) 8 Claims
OG exemplary drawing
 
1. A current sensor disposed separately from a busbar having a through-hole that penetrates the busbar in a thickness direction and that measures a current to be measured flowing through the busbar in a state in which the current sensor is inserted into the through-hole, the current sensor comprising:
a body section;
a detection section that extends from the body section and that is inserted into the through-hole;
a sensing section incorporated in the detection section and capable of detecting a magnetic field generated by flow of the current to be measured through the busbar,
wherein:
the current flowing in the busbar is measured based on a change in the magnetic field detected by the sensing section,
a direction of an axis of detection of the magnetic field performed by the sensing section extends in a direction of the insertion into the through-hole, when the sensing section is inserted into the through-hole together with the detection section,
the detection section has a reference shaped section that performs positioning of the detection section with respect to the through-hole,
the sensing section has a plurality of sensors that detect magnetic fields, and detection axes of the respective sensors are parallel to each other and do not overlap with each other,
the plurality of sensors is arranged in a setting plane including the insertion direction, and centers of the sensors are shifted from each other when viewed in a direction corresponding to an in-plane direction of the setting plane and orthogonal to the insertion direction,
first and second sensors are provided as the plurality of sensors, and
when a first virtual line extending in the insertion direction and a second virtual line orthogonal to the first virtual line are set in the in-plane direction of the setting plane,
the first and second sensors are disposed in point-symmetrical positions with respect to a reference point, which is an intersection of the first and second virtual lines, except on the first and second virtual lines, and
a current value of the current to be measured flowing in the busbar is calculated based on an output of the first sensor and an output of the second sensor.