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    MAGNETIC FIELD SENSOR WITH IMMUNITY TO EXTERNAL MAGNETIC INFLUENCES
    1.
    发明申请
    MAGNETIC FIELD SENSOR WITH IMMUNITY TO EXTERNAL MAGNETIC INFLUENCES 有权
    具有外部磁性影响的磁场传感器

    公开(公告)号：US20140333295A1

    公开(公告)日：2014-11-13

    申请号：US13891519

    申请日：2013-05-10

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Devon Fernandez ,  Paul David ,  William P. Taylor

    IPC: G01B7/00

    CPC classification number: G01B7/003 ,  G01R33/0023

    Abstract: A magnetic field sensor with enhanced immunity to external magnetic interference is presented. Included is a magnetic field signal generator and a demodulator. The magnetic field signal generator produces a magnetic field signal having a modulated signal portion in a first frequency band based on a sensed modulated AC bias magnetic field. The modulated AC bias magnetic field is produced by movement of ferromagnetic target relative to a bias coil when an AC signal is applied to the bias coil. When the magnetic field signal also includes an unwanted signal portion in a second frequency band based on external magnetic interference, demodulation performed by the demodulator results in the modulated signal portion being shifted from the first frequency band to a third frequency band and the unwanted signal portion being shifted to the first frequency band. The bias coil may be provided as part of the magnetic field sensor.

    Abstract translation: 提出了一种具有增强的对外部磁干扰的免疫力的磁场传感器。 包括磁场信号发生器和解调器。 磁场信号发生器基于感测的调制AC偏置磁场产生具有在第一频带中的调制信号部分的磁场信号。 当AC信号施加到偏置线圈时，调制的交流偏置磁场是通过铁磁体相对于偏置线圈的运动而产生的。 当磁场信号还包括基于外部磁干扰的第二频带中的不需要的信号部分时，由解调器执行的解调使得调制信号部分从第一频带移动到第三频带，并且不需要的信号部分 被移动到第一频带。 偏置线圈可以被设置为磁场传感器的一部分。

    Magnet with opposing directions of magnetization for a magnetic sensor
    2.
    发明授权
    Magnet with opposing directions of magnetization for a magnetic sensor 有权

    公开(公告)号：US10408892B2

    公开(公告)日：2019-09-10

    申请号：US13946010

    申请日：2013-07-19

    Applicant: Allegro MicroSystems, LLC

    Inventor： Paul David ,  William P. Taylor

    IPC: G01R33/07 ,  G01R33/02 ,  G01D5/14

    Abstract: In one aspect, a magnetic field sensor is configured to detect a ferromagnetic object. The magnetic field sensor includes a magnet that includes two North regions and two South regions configured to generate opposing directions of magnetization to form a magnetic flux. The magnetic field sensor also includes a magnetic field sensing element configured to generate an is output signal responsive to changes in the magnetic flux caused by movement of the ferromagnetic object.

    Magnetic Field Sensor Integrated Circuit with Integral Ferromagnetic Material
    6.
    发明申请
    Magnetic Field Sensor Integrated Circuit with Integral Ferromagnetic Material 有权
    具有积分铁磁材料的磁场传感器集成电路

    公开(公告)号：US20130249029A1

    公开(公告)日：2013-09-26

    申请号：US13748999

    申请日：2013-01-24

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Ravi Vig ,  William P. Taylor ,  Paul David ,  P. Karl Scheller ,  Andreas P. Friedrich

    IPC: H01L29/82

    CPC classification number: H01L29/82 ,  G01R33/0047 ,  G01R33/0052 ,  G01R33/06 ,  H01L2224/45147 ,  H01L2224/48247 ,  H01L2924/00011 ,  H01L2924/00 ,  H01L2924/01033

    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead. Also described is a coil secured to the non-conductive mold material and a lead having at least two separated portions with a passive component coupled across the two portions.

    Abstract translation: 磁场传感器包括引线框架，具有其中设置有磁场感测元件的第一表面和附接到引线框架的第二表面的半导体管芯以及封装管芯的非导电模具材料和至少一部分 的引线框架。 传感器可以包括固定到非导电模具材料的一部分的铁磁模具材料。 特征包括到铁磁模具材料的不连续中心区域的内表面的多倾斜锥形，设置在不连续中心区域中的单独形成的元件，引线框架中的一个或多个槽，模制铁磁抑制 与非导电模具材料间隔开并且包围引线的一部分，与非导电模具材料间隔开并耦合到多个引线的无源器件以及耦合到引线的铁磁珠。 还描述了固定到非导电模具材料的线圈和具有至少两个分离部分的引线，其中被动元件跨越两个部分耦合。

    Method and Apparatus for Magnetic Sensor Producing a Changing Magnetic Field
    8.
    发明申请
    Method and Apparatus for Magnetic Sensor Producing a Changing Magnetic Field 审中-公开
    用于产生变化磁场的磁传感器的方法和装置

    公开(公告)号：US20150022198A1

    公开(公告)日：2015-01-22

    申请号：US13946400

    申请日：2013-07-19

    Applicant: Allegro Microsystems, LLC

    Inventor： Paul David ,  William P. Taylor

    IPC: G01R33/09 ,  G01R33/07

    CPC classification number: G01R33/093 ,  G01D5/2013 ,  G01R33/00 ,  G01R33/07 ,  G01R33/09

    Abstract: Methods and apparatus for detecting a magnetic field include a semiconductor substrate, a coil configured to provide a changing magnetic field in response to a changing current in the coil; and a magnetic field sensing element supported by the substrate. The coil receives the changing current and, in response, generates a changing magnetic field. The magnetic field sensing element detects the presence of a magnetic target by detecting changes to the magnetic field caused by the target and comparing them to an expected value.

    Abstract translation: 用于检测磁场的方法和装置包括半导体衬底，配置成响应于线圈中的电流改变而提供变化的磁场的线圈; 以及由所述基板支撑的磁场感测元件。 线圈接收变化的电流，作为响应，产生变化的磁场。 磁场检测元件通过检测由目标引起的磁场的变化并将其与预期值进行比较来检测磁目标的存在。

    MAGNET WITH OPPOSING DIRECTIONS OF MAGNETIZATION FOR A MAGNETIC SENSOR
    9.
    发明申请
    MAGNET WITH OPPOSING DIRECTIONS OF MAGNETIZATION FOR A MAGNETIC SENSOR 审中-公开
    具有磁性传感器磁化方向的磁铁

    公开(公告)号：US20150022197A1

    公开(公告)日：2015-01-22

    申请号：US13946010

    申请日：2013-07-19

    Applicant: Allegro Microsystems, LLC

    Inventor： Paul David ,  William P. Taylor

    IPC: G01R33/07 ,  G01R33/02

    CPC classification number: G01R33/07 ,  G01D5/147 ,  G01R33/02

    Abstract: In one aspect, a magnetic field sensor is configured to detect a ferromagnetic object. The magnetic field sensor includes a magnet that includes two North regions and two South regions configured to generate opposing directions of magnetization to form a magnetic flux. The magnetic field sensor also includes a magnetic field sensing element configured to generate an is output signal responsive to changes in the magnetic flux caused by movement of the ferromagnetic object.

    Abstract translation: 在一个方面，磁场传感器被配置为检测铁磁物体。 磁场传感器包括磁体，其包括两个北部区域和两个南部区域，其被配置为产生相反的磁化方向以形成磁通量。 磁场传感器还包括磁场感测元件，其被配置为响应于由铁磁物体的移动引起的磁通量的变化而产生输出信号。

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