公开(公告)号：US12204001B2

公开(公告)日：2025-01-21

申请号：US18013453

申请日：2021-07-07

Applicant: TDK CORPORATION

Inventor： Atsushi Matsuda ,  Yosuke Nagakubo

IPC: G01R33/022 ,  G01R33/028

Abstract: A gradient magnetic field sensor includes: an AC power supply connection terminal to which a first power supply terminal included in an AC power supply is connected; a first magnetic core connected between the connection terminal and the ground; a second magnetic core connected in parallel with the first magnetic core between the connection terminal and ground; an AC current control unit connected between the connection terminal and at least one of the first magnetic core and the second magnetic core and configured to control an AC current flowing through at least one of the first and second magnetic core; a first detection coil wound around the first magnetic core; a second detection coil wound around second magnetic core and differentially-connected with the first detection coil; and a detection circuit that detects a voltage difference between first voltage output from first detection coil and second voltage output from the second.