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.

公开(公告)号：US20210172982A1

公开(公告)日：2021-06-10

申请号：US17065853

申请日：2020-10-08

Applicant: TDK Corporation

Inventor： Adrian LO ,  Masafumi KAMI ,  Jun HIRABAYASHI

IPC: G01R19/15 ,  G01R15/20

Abstract: Disclosed herein is a current sensor that includes a bus bar and a magnetic sensor. The bus bar includes first and second cylindrical structure parts which are coaxially arranged, and a sensing part disposed in a hollow area surrounded by the first and second cylindrical structure parts. The magnetic sensor is disposed in the hollow area. The bus bar is configured to branch current to be measured into the first cylindrical structure part and sensing part and to make at least part of a current component of the current to be measured that flows in the first cylindrical structure part in one direction flow in the second cylindrical structure part in an opposite direction to the one direction.

公开(公告)号：US20180106874A1

公开(公告)日：2018-04-19

申请号：US15725568

申请日：2017-10-05

Applicant: TDK Corporation

Inventor： Takahiro HAMAMURA ,  Takashi OSADA ,  Masafumi KAMI ,  Adrian LO

IPC: G01R33/06 ,  G01R15/18 ,  G01R33/04 ,  H01F27/28

CPC classification number: G01R33/063 ,  G01R15/183 ,  G01R15/186 ,  G01R33/04 ,  H01F27/28

Abstract: Disclosed herein is an inductance element for a magnetic sensor. The inductance element includes a first core comprising a first soft magnetic material and having first and second connecting surfaces, a second core comprising a second soft magnetic material different from the first soft magnetic material and having third and fourth connecting surfaces facing the first and second connecting surfaces, respectively, and a coil wound around the first core between the first and second connecting surfaces, wherein the first core is larger in magnetic field strength at which magnetic saturation occurs than the second core, and wherein the second core is higher in permeability than the first core and has at least partially a meander shape.

公开(公告)号：US20170125151A1

公开(公告)日：2017-05-04

申请号：US15337402

申请日：2016-10-28

Applicant: TDK Corporation

Inventor： Takahiro HAMAMURA ,  Takashi OSADA ,  Masafumi KAMI ,  Adrian LO

IPC: H01F27/26 ,  G01R15/18 ,  G01R33/04 ,  H01F27/29 ,  H01F27/28

CPC classification number: H01F27/266 ,  G01R15/183 ,  G01R33/04 ,  G01R33/063 ,  H01F17/04 ,  H01F27/2823 ,  H01F27/29

Abstract: Disclosed herein is a magnetic sensor including: a first core made of a first soft magnetic material, the first core having first and second connection surfaces; a second core made of a second soft magnetic material different from the first soft magnetic material, the second core having a third connection surface facing the first connection surface and a fourth connection surface facing the second connection surface; and a coil wound around the first core between the first connection surface and the second connection surface. The first core reaches magnetic saturation at a higher magnetic field intensity than that of the second core, and the second core has a higher magnetic permeability than that of the first core.