US 11,815,571 B2
Electric current sensor and sensing device
Nai-Chung Fu, Jhubei (TW); Chien-He Hou, Jhubei (TW); Chih-Chao Shih, Jhubei (TW); and Fu-Tai Liou, Jhubei (TW)
Assigned to VOLTAFIELD TECHNOLOGY CORPORATION, Jhubei (TW)
Filed by Voltafield Technology Corporation, Jhubei (TW)
Filed on May 3, 2022, as Appl. No. 17/735,202.
Claims priority of application No. 110117975 (TW), filed on May 18, 2021.
Prior Publication US 2022/0373619 A1, Nov. 24, 2022
Int. Cl. G01R 33/09 (2006.01); G01R 33/00 (2006.01)
CPC G01R 33/096 (2013.01) [G01R 33/0094 (2013.01); G01R 33/093 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electric current sensor, comprising:
a substrate, configured to have a first surface defined by a first axis and a second axis;
a shield structure, arranged at top side of the electric current sensor, bottom side of the electric current sensor or arranged around the electric current sensor for shielding an external magnetic field along the first axis and the second axis;
a sensing circuit, formed on the first surface and configured to detect a magnetic field along a third axis, the sensing circuit comprising a plurality of pairs of magnetic field sensors, and each magnetic field sensor further comprising:
a horizontal magnetoresistive layer, arranged above the first surface and configured to have a first side along a lengthwise direction thereof and a second side opposite to the first side;
a conductive portion, formed at top side or bottom side of the horizontal magnetoresistive layer and configured to have a plurality of conductive structures; and
at least one magnetic field sensing layer, formed at the first side of the horizontal magnetoresistive layer or at the second side of the horizontal magnetoresistive layer, each magnetic field sensing layer comprising at least one sidewall connected to each other; and
a loop circuit, arranged around the periphery of the sensing circuit for generating a first magnetic field along the third axis, and a second magnetic field along the third axis, wherein the magnetic field along the third axis is concentrated to the magnetic field sensors through the first magnetic field and the second magnetic field along the third axis generated by the loop circuit.