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    ABSOLUTE ANGLE SENSOR WITH IMPROVED ACCURANCY USING ERROR ESTIMATION
    2.
    发明申请
    ABSOLUTE ANGLE SENSOR WITH IMPROVED ACCURANCY USING ERROR ESTIMATION 有权

    公开(公告)号：US20210148734A1

    公开(公告)日：2021-05-20

    申请号：US16689494

    申请日：2019-11-20

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andrea Foletto

    IPC: G01D5/244 ,  G01D5/245

    Abstract: In some embodiments, a method can include receiving, by an angle sensor, a first periodic angle signal indicative of an angle of a first magnetic field associated with a first track of a target; receiving, by the angle sensor, a second periodic angle signal indicative of an angle of a second magnetic field associated with a second track of the target; generating an uncorrected absolute angle signal indicative of an absolute angle of the target based on the first and second periodic angle signals; determining an estimated error associated with the uncorrected absolute angle signal based on the first periodic angle signal and the second periodic signal; subtracting the estimated error from the uncorrected absolute angle to generate a corrected absolute angle signal; and providing the corrected absolute angle signal as output of the angle sensor.

    Magnetic field sensor with adaptive threshold and associated methods
    3.
    发明授权
    Magnetic field sensor with adaptive threshold and associated methods 有权

    公开(公告)号：US10690731B2

    公开(公告)日：2020-06-23

    申请号：US16145841

    申请日：2018-09-28

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andrea Foletto ,  Florian Kulla

    IPC: G01R33/00 ,  G01P3/44

    Abstract: A magnetic field sensor including at least one magnetic field sensing element configured to generate a magnetic field signal indicative of a magnetic field associated with a target and a detector responsive to the magnetic field signal and to a threshold level to generate a sensor output signal containing transitions associated with features of the target in response to the magnetic field signal crossing the threshold level further includes a threshold generator to generate an adaptive threshold. The threshold generator is configured to generate the threshold level to achieve a predetermined fixed hard offset and that adapts with a variation in the airgap in order to minimize an error between times or angles of the transitions of the sensor output signal over the variation in the airgap.

    MAGNETIC FIELD SENSOR WITH MAGNETORESISTANCE ELEMENTS HAVING VARYING SENSITIVITY
    4.
    发明申请
    MAGNETIC FIELD SENSOR WITH MAGNETORESISTANCE ELEMENTS HAVING VARYING SENSITIVITY 审中-公开

    公开(公告)号：US20200041584A1

    公开(公告)日：2020-02-06

    申请号：US16055644

    申请日：2018-08-06

    Applicant: Allegro MicroSystems, LLC

    Inventor： Rémy Lassalle-Balier ,  Jeffrey Eagen ,  Andrea Foletto

    IPC: G01R33/09 ,  G01R33/00 ,  G01D5/14 ,  H03K17/97

    Abstract: A magnetic field sensor includes a substrate having a surface and a plurality of magnetoresistance elements supported by the surface of the substrate. Each magnetoresistance element has a respective width parallel to the surface, and each width may be a smallest dimension parallel to the surface. A first width of a first magnetoresistance element of the plurality of magnetoresistance elements may be different from a second width of a second magnetoresistance element of the plurality of magnetoresistance elements. A processing circuit may be coupled to the plurality of magnetoresistance elements to receive a signal representing a detected magnetic field from at least one of the magnetoresistance elements.

    Magnetic Field Sensor Having at Least Two CVH Elements and Method of Operating Same
    5.
    发明申请
    Magnetic Field Sensor Having at Least Two CVH Elements and Method of Operating Same 审中-公开

    公开(公告)号：US20190250222A1

    公开(公告)日：2019-08-15

    申请号：US15892843

    申请日：2018-02-09

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andreas P. Friedrich ,  Andrea Foletto ,  Nicolas Yoakim

    IPC: G01R33/07 ,  G01R33/00

    CPC classification number: G01R33/077 ,  G01R33/0005 ,  G01R33/0094

    Abstract: A magnetic field sensor for sensing a direction of a magnetic field in an x-y plane, can include a first plurality of magnetic field sensing elements operable to generate a first plurality of magnetic field signals and a second plurality of magnetic field sensing elements operable to generate a second plurality of magnetic field signals. The magnetic field sensor can also include at least one sequence switches circuit operable to select ones of the first plurality of magnetic field signals and to select ones of the second plurality of magnetic field signals. The magnetic field sensor can also include a processing circuit operable to combine the selected ones of the first plurality of magnetic field signals and the selected ones of the second plurality of magnetic field signals to generate at least one sequential signal and to process the at least one sequential signal to generate an x-y angle signal indicative of a direction of the magnetic field in the x-y direction. An associated method is described.

    ENHANCED NEUTRAL GEAR SENSOR
    6.
    发明申请
    ENHANCED NEUTRAL GEAR SENSOR 审中-公开

    公开(公告)号：US20170356763A1

    公开(公告)日：2017-12-14

    申请号：US15176524

    申请日：2016-06-08

    Applicant: Allegro MicroSystems, LLC

    Inventor： Yannick Vuillermet ,  Cédric Gillet ,  Andrea Foletto ,  Andreas P. Friedrich

    IPC: G01D5/14 ,  F16H59/04 ,  G01D5/16

    CPC classification number: F16H59/044 ,  G01D5/147

    Abstract: Embodiments provide systems and methods for determining a position of a gear shift lever of a vehicle. A ferromagnetic target object having selected characteristics influences a magnetic field generated by a back bias magnet. A magnetic field sensor includes magnetic field sensing elements disposed proximate to the target object. Each magnetic field sensing element generates an electronic signal in response to sensed magnetic fields. The gear shift lever moves among a plurality of gears of the vehicle. The magnetic field sensor selects a set of the magnetic field sensing elements to determine a magnetic field difference based on a difference of amplitudes between the electronic signals that is related to a current position of the gear shift lever. Characteristics of the target object enable the magnetic field sensor to detect the position of the gear shift lever. The characteristics include edges proximate to a perimeter of the target object.

    Circuits and methods for processing signals generated by a circular vertical hall (CVH) sensing element in the presence of a multi-pole magnet
    8.
    发明授权
    Circuits and methods for processing signals generated by a circular vertical hall (CVH) sensing element in the presence of a multi-pole magnet 有权
    用于在存在多极磁体的情况下处理由圆形垂直霍尔（CVH）感测元件产生的信号的电路和方法

    公开(公告)号：US09541424B2

    公开(公告)日：2017-01-10

    申请号：US15186433

    申请日：2016-06-18

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andreas P. Friedrich ,  Andrea Foletto

    IPC: G01R33/07 ,  G01D5/14

    CPC classification number: G01D5/145 ,  G01B7/30 ,  G01D5/2451 ,  G01R33/0023 ,  G01R33/007 ,  G01R33/072 ,  G01R33/077

    Abstract: Described embodiments provide a magnetic field sensor has a circular vertical Hall (CVH) sensing element with a plurality of vertical Hall elements disposed over a common implant region in a substrate. The magnetic field sensor generates output signals responsive to a magnetic field generated by a multi-pole magnet having a plurality of north poles and also a plurality of south poles. An angle sensor generates an angle signal representative of an angle of a direction component of the magnetic field. A pole pair counter generates a count signal representative of a count of a number of the pole pairs of the multi-pole magnet that move past the CVH sensing element. An angle interpolation module generates a reconstructed angle signal representative of an angular position of the multi-pole magnet relative to the CVH sensing element based upon the count signal and the angle signal. Corresponding methods are also described.

    Abstract translation: 描述的实施例提供一种具有圆形垂直霍尔（CVH）感测元件的磁场传感器，其具有设置在基板中的公共注入区域上的多个垂直霍尔元件。 磁场传感器响应于具有多个北极以及多个南极的多极磁铁产生的磁场产生输出信号。 角度传感器产生表示磁场的方向分量的角度的角度信号。 极对计数器产生表示移动经过CVH感测元件的多极磁体的极对数的计数的计数信号。 角度插补模块基于计数信号和角度信号产生代表多极磁体相对于CVH感测元件的角位置的重建角度信号。 还描述了相应的方法。

    MAGNETIC FIELD MOTION SENSOR AND RELATED TECHNIQUES
    9.
    发明申请
    MAGNETIC FIELD MOTION SENSOR AND RELATED TECHNIQUES 有权
    磁场运动传感器及相关技术

    公开(公告)号：US20160123770A1

    公开(公告)日：2016-05-05

    申请号：US14529480

    申请日：2014-10-31

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Christian Feucht ,  Andreas P. Friedrich ,  Andrea Foletto

    IPC: G01D5/14 ,  G01D5/20

    CPC classification number: G01D5/145

    Abstract: A magnetic field sensor for detecting motion of an object includes magnetic field sensing elements to generate at least two phase-separated magnetic field signals and a processor including a vector angle generator to generate vector angle values as a function of the magnetic field signals and a vector angle comparator to generate a comparator output signal indicative of a difference between a plurality of vector angle values. An output signal generator responsive to the comparator output signal is configured to generate a sensor output signal indicative of a one or more conditions of motion of the object including: an absence of normal rotation, a direction change, and a vibration. In some embodiments, the vector angle comparator may generate a comparator output signal indicative of a comparison of a vector angle value and one or more threshold values. In this case, the output signal generator may be configured to generate a sensor output signal indicative of a speed of motion and/or a position of the object.

    Abstract translation: 用于检测物体运动的磁场传感器包括用于产生至少两个相位分离的磁场信号的磁场感测元件和包括矢量角发生器的处理器，以产生作为磁场信号的函数的矢量角度值和矢量 角度比较器，以产生指示多个矢量角度值之间的差的比较器输出信号。 响应于比较器输出信号的输出信号发生器被配置为产生指示物体的一个或多个运动条件的传感器输出信号，包括：没有正常旋转，方向改变和振动。 在一些实施例中，向量角度比较器可以产生指示向量角度值与一个或多个阈值的比较的比较器输出信号。 在这种情况下，输出信号发生器可被配置为产生指示运动速度和/或物体的位置的传感器输出信号。

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