Patent ID: 9746497
Date: 2017-08-29
CPC Classifications: G01R

Claim:
1. A current measurement method comprising steps of: providing, at part of a conductor to which a measurement target current flows in a first direction, a nonconductive area which the measurement target current does not flow that generates a component in the first direction in a magnetic field raised by the measurement target current by the nonconductive area changing a flowing direction of the measurement target current from the first direction to another direction; arranging a magnetic detection element near the nonconductive area such that a direction in which the magnetic detection element detects the magnetic field is in the first direction; causing the magnetic detection element to detect a magnetic field generated by the measurement target current whose flowing direction is changed by the nonconductive area, the magnetic field being a magnetic field component of a bypass current flowing outside the nonconductive area, which is directed in the first direction of the measurement target current; and estimating an amount of the measurement target current from an output of the magnetic detection element.