Current value detection method and the current value detecting device

摘要

PROBLEM TO BE SOLVED: To easily detect a current value at a desired optional portion without requiring a large arrangement space necessary for, for example, a toroidal coil.;SOLUTION: A magnetic flux sensor 10 wherein a coil 14 is formed by using as a core a flexible sheet-shaped magnetic body 11 having a sufficiently high magnetic permeability compared with the magnetic permeability of the air is arranged along at least a part of a magnetic flux path in the state where its sheet face is in parallel with the flowing direction of a current which is a detection object and the magnetic flux path generated around the position where the current which is the detection object flows passes inside the coil 14. A signal acquired from the coil 14 is amplified and corrected by an amplification gain corresponding to the distance between the position of the current flowing in a wire and the magnetic flux sensor, and an open angle when viewing the length portion in the direction along the magnetic flux path of the sheet-shaped magnetic body from the center by assuming as the center the position where the current which is the detection object flows, and the value of the current which is the detection object is detected from the corrected signal.;COPYRIGHT: (C)2004,JPO