Patent ID: 8415948
Filing Date: 2013-04-09
Classification: G01R

Abstract:
1. A current sensor, comprising: an annular magnetic core that comprises a closed magnetic path including a flux sensing void in a portion thereof and a magnetic body for focusing flux of a magnetic field generated around a conductor that carries a measured current; and a magnetic detecting portion for detecting flux of a magnetic field generated in the void of the magnetic core, wherein the magnetic core includes, in a cross sectional view orthogonal to the conductor, a plurality of pairs of stepped portions on a pair of opposing end portions that form the flux sensing void, each stepped portion protrudes from its respective end portion toward the opposing end portion, and distances between end surfaces of directly opposing stepped portions sequentially decrease for all of the stepped portions along a direction extending away from the conductor in the cross sectional view, and wherein an end surface between two adjacent stepped portions among the plurality of pairs of stepped portions comprises a concavity that opens to the void.