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.

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：US20180137969A1

公开(公告)日：2018-05-17

申请号：US15808747

申请日：2017-11-09

Applicant: TDK Corporation

Inventor： Takahiro HAMAMURA ,  Takashi OSADA

IPC: H01F27/34 ,  H01F27/24 ,  H01F27/28 ,  G01R33/05

Abstract: Disclosed herein is an inductance element that includes a base body, a saturable magnetic thin-plate core provided on the base body, and a coil conductor wound around the saturable magnetic thin-plate core. The saturable magnetic thin-plate core includes a first section linearly extending in a first direction and a second section having a meander-shaped, and the coil conductor is wound around the first section of the saturable magnetic thin-plate core.