Patent ID: 8497677
Filing Date: 2013-07-30
Classification: G01R,H01F,Y10T

Abstract:
1. A current sensing device for sensing a current, comprising: a core having a gap; and a magnetic sensor inserted in the gap of the core and configured to detect a magnetic flux that is generated in the core in response to the current, thereby sensing the current, wherein: the core includes a plurality of first core members and a plurality of second core member, each being made of a grain-oriented magnetic steel sheet having a magnetization easy axis in a predetermined direction thereof; the plurality of first core members and the plurality of second core members are alternately stacked into a multiple layer structure so that a direction of the magnetization easy axis of each first core member and that of each second core member are perpendicular to each other; each first core member has a through-hole as a first trap part that suppresses flow of the magnetic flux in a respective first core member in a direction perpendicular to the magnetization easy axis of the respective first core member; and each second core member has a through-hole as a second trap part that suppresses flow of the magnetic flux in a respective second core member in a direction perpendicular to the magnetization easy axis of the respective second core member.