公开(公告)号：US11143719B2

公开(公告)日：2021-10-12

申请号：US16672558

申请日：2019-11-04

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yasuhiro Shimizu ,  Takashi Kawanami ,  Nobumasa Kitamori ,  Noritaka Kishi

IPC: G01R33/09 ,  G01R15/20 ,  G01R19/00 ,  G01R33/00

Abstract: A magnetic sensor senses a magnetic field in a predetermined magnetic sensing direction. The magnetic sensor includes a chip on which at least one magnetic device is provided. The length of the chip in the magnetic sensing direction is twice or more the length of the chip in an orthogonal direction that is orthogonal or substantially orthogonal to the magnetic sensing direction.

公开(公告)号：US10006945B2

公开(公告)日：2018-06-26

申请号：US15795359

申请日：2017-10-27

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takashi Kawanami

IPC: G01R15/20

CPC classification number: G01R15/205

Abstract: An electric current sensor includes a primary conductor through which an electric current to be measured flows, and at least one magnetic sensor. The magnetic sensor includes a first magnetic sensor area, the output sensitivity of which is decreased when a magnetic field is applied to include a magnetic field component in a first direction along a sensitivity variation axis, and a second magnetic sensor area, the output sensitivity of which is increased when the magnetic field is applied to include a magnetic field component in a second direction that is opposite to the first direction.

公开(公告)号：US11637532B2

公开(公告)日：2023-04-25

申请号：US17151805

申请日：2021-01-19

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takashi Kawanami ,  Makoto Tabei

IPC: H03F1/22 ,  H03F1/56 ,  H03F3/195

Abstract: An amplifier circuit includes: a transistor provided between an input terminal and an output terminal and having a gate connected to the input terminal, a source connected to a ground, and a drain connected to the output terminal; an inductor connected between the source and the ground; an inductor connected between the gate and the input terminal, and switches connected to at least one of the inductors and configured to change a mutual inductance of the inductors.

公开(公告)号：US09714959B2

公开(公告)日：2017-07-25

申请号：US14831018

申请日：2015-08-20

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takashi Kawanami

IPC: G01R15/20 ,  G01R19/20

CPC classification number: G01R15/20 ,  G01R15/202 ,  G01R15/205 ,  G01R15/207 ,  G01R19/20

Abstract: A busbar module including a busbar through which current of a measurement subject flows and a hold portion that holds the busbar and has a recess portion), the busbar and the hold portion being integrally formed; and a magnetic sensor module including a magnetic sensor that detects an intensity of a magnetic field generated by the current flowing through the busbar, and being able to be selectively assembled with the busbar module by housing the magnetic sensor module to the recess portion of the hold portion are included.

公开(公告)号：US10161971B2

公开(公告)日：2018-12-25

申请号：US15489766

申请日：2017-04-18

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yasuhiro Shimizu ,  Takashi Kawanami

IPC: G01J5/16 ,  G01R15/20 ,  G01R33/09

Abstract: A current sensor includes a primary conductor in which a current flows, a magnetic sensor that detects a strength of a magnetic field produced by the current, and a magnetic body that surrounds a periphery of the primary conductor and the magnetic sensor. Output characteristics of the magnetic sensor include a low-output region in which a measured voltage value lower than a virtual output voltage proportional to a value of the current is outputted. Magnetization characteristics of the magnetic body include a magnetic saturation region in which permeability decreases in ranges where an absolute value of the current is no less than a threshold. An output of the magnetic sensor is corrected such that the measured voltage value increases as a result of a magnetic field leaking from the magnetic body that is within the magnetic saturation region acting on the magnetic sensor that is in the low-output region.

公开(公告)号：US10605835B2

公开(公告)日：2020-03-31

申请号：US15590035

申请日：2017-05-09

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takashi Kawanami ,  Yasuhiro Shimizu

IPC: G01R15/20 ,  G01R7/02 ,  G01R33/02 ,  G01R33/07

Abstract: A current sensor includes a substrate including a through-hole and at least one groove around the through-hole, a primary conductor extending into the through-hole and through the substrate, and through which a current to be measured flows, at least one magnetic sensor that is mounted on a first surface of the substrate and detects a strength of a magnetic field generated by the current to be measured flowing through the primary conductor, and at least one magnetic body surrounding the primary conductor and including a portion extending in the at least one groove to be fixed to the substrate.

公开(公告)号：US10274524B2

公开(公告)日：2019-04-30

申请号：US15908858

申请日：2018-03-01

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takashi Kawanami

IPC: G01R15/20 ,  G01R19/00 ,  H02M7/48 ,  H02M1/00

Abstract: A conductor includes a first flow path portion and a second flow path portion through which a current as a measurement target flows in a branched manner at a halfway position in a lengthwise direction of the conductor. The first flow path portion and the second flow path portion are located with a space therebetween in the width direction of the conductor when viewed from the thickness direction of the conductor. A region surrounded by the first flow path portion and the second flow path portion is provided when viewed from the width direction of the conductor. At least a portion of a substrate is located in the region and opposes at least one of the first flow path portion and the second flow path portion when viewed from the width direction of the conductor. The first magnetic sensor and the second magnetic sensor are arranged in the space.