公开(公告)号：US20220178972A1

公开(公告)日：2022-06-09

申请号：US17438342

申请日：2020-03-11

Applicant: TDK Corporation

Inventor： Adrian LO ,  Isao MATSUMOTO ,  Tatsumaro HORI ,  Takahiro HAMAMURA ,  Takashi OSADA ,  Masafumi KAMI

IPC: G01R15/20 ,  G01R19/00

Abstract: A current sensor includes a bus bar in which current to be measured flows and a magnetic sensor for detecting a magnetic field generated by the current flowing in the bus bar. The bus bar includes a bypass bus bar having a cylindrical structure and a sensing bus bar disposed in a hollow area surrounded by the bypass bus bar. The magnetic sensor is disposed in the hollow area. An area having a zero magnetic field is formed in the hollow area of the bypass bus bar. Thus, by disposing the sensing bus bar in the zero magnetic field area, it is possible to accurately measure the amount of current flowing in the bus bar while preventing saturation of the magnetic sensor even when the current flowing in the bus bar is large.