公开(公告)号：US20210239774A1

公开(公告)日：2021-08-05

申请号：US17155307

申请日：2021-01-22

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R15/20 ,  G01R1/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20140292321A1

公开(公告)日：2014-10-02

申请号：US14177602

申请日：2014-02-11

Applicant: TDK CORPORATION

Inventor： Hiroshi YAMAZAKI ,  Yoshiyuki MIZOGUCHI ,  Takahiro IMAI ,  Satoshi ABE ,  Homare TOKIDA

IPC: G01R33/09

CPC classification number: G01R33/093 ,  G01R33/098

Abstract: A magnetic sensor includes an MR element and a pair of magnets. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The pair of magnets applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.

Abstract translation: 磁传感器包括MR元件和一对磁体。 MR元件包括具有在与X方向平行的方向上固定的磁化的磁化固定层，具有根据外部磁场的X方向分量而变化的磁化的自由层和介于磁化之间的非磁性层 钉扎层和自由层。 磁化钉扎层，非磁性层和自由层在Y方向上堆叠成相邻。 自由层在由磁化固定层产生的与X方向平行的方向上接收层间耦合磁场。 这对磁体对自由层施加偏置磁场。 偏置磁场包括与层间耦合磁场的方向相反的方向的第一分量和Z方向上的第二分量。

公开(公告)号：US20140292322A1

公开(公告)日：2014-10-02

申请号：US14189211

申请日：2014-02-25

Applicant: TDK CORPORATION

Inventor： Hiroshi YAMAZAKI ,  Yoshiyuki MIZOGUCHI ,  Satoshi ABE ,  Homare TOKIDA ,  Toshiyuki AYUKAWA

IPC: G01R33/09

CPC classification number: G01R33/098 ,  G01R33/093

Abstract: A magnetic sensor includes an MR element and a bias field generation unit. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The bias field generation unit applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.

Abstract translation: 磁传感器包括MR元件和偏置场产生单元。 MR元件包括具有在与X方向平行的方向上固定的磁化的磁化固定层，具有根据外部磁场的X方向分量而变化的磁化的自由层和介于磁化之间的非磁性层 钉扎层和自由层。 磁化钉扎层，非磁性层和自由层在Y方向上堆叠成相邻。 自由层在由磁化固定层产生的与X方向平行的方向上接收层间耦合磁场。 偏置场产生单元向自由层施加偏置磁场。 偏置磁场包括与层间耦合磁场的方向相反的方向的第一分量和Z方向上的第二分量。

公开(公告)号：US20220317210A1

公开(公告)日：2022-10-06

申请号：US17847694

申请日：2022-06-23

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R1/20 ,  G01R15/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20140292313A1

公开(公告)日：2014-10-02

申请号：US14164315

申请日：2014-01-27

Applicant: TDK CORPORATION

Inventor： Kunihiro UEDA ,  Hiraku HIRABAYASHI ,  Satoshi ABE ,  Homare TOKIDA

IPC: G01B7/14

CPC classification number: G01B7/14 ,  G01B7/30

Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.

Abstract translation: 磁传感器系统包括在第一方向上以相对位置关系变量布置的刻度尺和磁传感器，以及计算单元。 磁传感器包括分别设置在第一位置，第二位置和第三位置的第一检测电路，第二检测电路和第三检测电路。 第一至第三检测电路中的每一个包括自旋阀MR元件。 在第一方向上彼此最远的第一至第三位置中的两个之间的差异落在刻度尺和磁性传感器之间的相对位置关系的单间距变化量中。 计算单元通过使用来自第一至第三检测电路的检测信号的计算产生具有相互不同相位的第一和第二后计算信号。

公开(公告)号：US20140292314A1

公开(公告)日：2014-10-02

申请号：US14164776

申请日：2014-01-27

Applicant: TDK CORPORATION

Inventor： Homare TOKIDA ,  Satoshi ABE ,  Hiroshi YAMAZAKI ,  Takahiro IMAI

IPC: G01R33/09 ,  G01B7/14

CPC classification number: G01B7/14 ,  G01D5/24461 ,  G01D5/24466 ,  G01D5/2451 ,  G01R33/093

Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit disposed at a first position and a second detection circuit disposed at a second position. Each of the first and second detection circuits includes a spin-valve magnetoresistive element. The difference between the first position and the second position in the first direction is smaller than or equal to 1.25% of a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates an abnormal-event determination signal indicative of the presence of an abnormal event in the magnetic sensor by computation using detection signals from the first and second detection circuits.

Abstract translation: 磁传感器系统包括在第一方向上以相对位置关系变量布置的刻度尺和磁传感器，以及计算单元。 磁传感器包括设置在第一位置的第一检测电路和设置在第二位置的第二检测电路。 第一和第二检测电路中的每一个包括自旋阀磁阻元件。 第一方向上的第一位置和第二位置之间的差异小于或等于刻度尺与磁性传感器之间的相对位置关系的单音量变化量的1.25％。 计算单元通过使用来自第一和第二检测电路的检测信号的计算，产生表示磁传感器中存在异常事件的异常事件判定信号。