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    CURRENT SENSOR HAVING STRAY FIELD IMMUNITY
    84.
    发明申请
    CURRENT SENSOR HAVING STRAY FIELD IMMUNITY 有权

    公开(公告)号：US20210285794A1

    公开(公告)日：2021-09-16

    申请号：US16818199

    申请日：2020-03-13

    Applicant: Allegro MicroSystems, LLC

    Inventor： Robert A. Briano ,  Paul A. David

    IPC: G01D5/14 ,  G01R33/09 ,  G01R33/07

    Abstract: Methods and apparatus for a current sensor having an elongate current conductor having an input and an output and a longitudinal axis. First, second, third and fourth magnetic field sensing elements are coupled in a bridge configuration and positioned in a plane parallel to a surface of the current conductor such that the second and fourth magnetic field sensing elements comprise inner elements and the first and third magnetic field sensing elements comprise outer elements. Embodiments of the sensor reduce the effects of stray fields on the sensor.

    INTEGRATED CIRCUIT PACKAGE HAVING A LOW PROFILE
    85.
    发明申请
    INTEGRATED CIRCUIT PACKAGE HAVING A LOW PROFILE 有权

    公开(公告)号：US20210057314A1

    公开(公告)日：2021-02-25

    申请号：US16547814

    申请日：2019-08-22

    Applicant: Allegro MicroSystems, LLC

    Inventor： Paul A. David ,  Harry Chandra ,  William P. Taylor

    IPC: H01L23/495 ,  H01L23/31 ,  H01L21/56 ,  G01R33/07 ,  H01L43/06 ,  H01L43/12 ,  H01L25/065

    Abstract: A method of providing a sensor IC package can include applying a film to a leadframe having first and second surfaces, mounting at least one component to the film, and applying a pre-mold material to cover at least a portion of the leadframe and the passive component while leaving a first side of the leadframe exposed. The film can be removed and a die attached to the first side of the leadframe. At least one electrical connection can be formed between the die and the leadframe. The assembly of the die, the leadframe, and the pre-mold material can be encapsulated with a final mold material to provide a low profile IC package.

    Magnetic field sensor integrated circuit with an integrated coil
    86.
    发明授权
    Magnetic field sensor integrated circuit with an integrated coil 有权

    公开(公告)号：US10916665B2

    公开(公告)日：2021-02-09

    申请号：US16252789

    申请日：2019-01-21

    Applicant: Allegro MicroSystems, LLC

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

    IPC: H01L29/82 ,  G01R33/06 ,  G01R33/00 ,  G01D5/14 ,  G01R15/20

    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.

    Magnetic Field Sensor And Method Having Reduced False Switching
    87.
    发明申请
    Magnetic Field Sensor And Method Having Reduced False Switching 有权

    公开(公告)号：US20210025735A1

    公开(公告)日：2021-01-28

    申请号：US16522810

    申请日：2019-07-26

    Applicant: Allegro MicroSystems, LLC

    Inventor： Paul A. David ,  William P. Taylor

    IPC: G01D5/244

    Abstract: A magnetic field sensor includes a substrate first and second magnetic field sensing elements, comprising first and second magnetoresistance elements, respectively. The first and second magnetic field sensing elements are responsive to the magnet. At or more positions of the magnet relative to the first and second magnetic field sensing elements while the magnet is stopped moving, at least one of the first magnetic field sensing element or the second magnetic field sensing element is in saturation in response to the magnet. The magnetic field sensor also includes a third magnetic field sensing element proximate to the first and second magnetoresistance elements, the third magnetic field sensing element operable to generate a third magnetic field sensing element signal responsive to the magnet, wherein, at the one or more positions while the magnet is stopped moving, the third magnetic field sensing element is not in saturation in response to the magnet or saturates at a higher magnetic field than the first and second magnetic field sensing elements in response to the magnet.

    Magnetic Field Sensor Having Unequally Spaced Magnetic Field Sensing Elements
    90.
    发明申请
    Magnetic Field Sensor Having Unequally Spaced Magnetic Field Sensing Elements 审中-公开

    公开(公告)号：US20200209017A1

    公开(公告)日：2020-07-02

    申请号：US16232348

    申请日：2018-12-26

    Applicant: Allegro MicroSystems, LLC

    Inventor： Jeffrey Eagen ,  Paul A. David

    IPC: G01D5/245 ,  G01M13/021 ,  G01D5/14

    Abstract: A magnetic field sensor for sensing a movement of a target object an include a substrate having a major planar surface and three or more magnetic field sensing elements disposed upon the major planar surface of the substrate. The three or more magnetic field sensing elements can have respective major response axes, each major response axis parallel to the major planar surface of the substrate. The three or more magnetic field sensing elements comprise first and third magnetic field sensing elements and a second magnetic field sensing element disposed between the first and third magnetic field sensing elements. A first spacing between the first and second magnetic field sensing elements is less than a second spacing between the second and third magnetic field sensing elements. No other magnetic field sensing elements are disposed between the first and third magnetoresistance elements.

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