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公开(公告)号：US20220128379A1
公开(公告)日：2022-04-28
申请号：US17647350
申请日：2022-01-07
Applicant: Allegro MicroSystems, LLC
Inventor： Rémy Lassalle-Balier , Jeffrey Eagen , Damien Dehu , Paul A. David , Andrea Foletto , Maxime Rioult
Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.
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公开(公告)号：US11313924B2
公开(公告)日：2022-04-26
申请号：US16856582
申请日：2020-04-23
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , William P. Taylor
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.
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公开(公告)号：US11280637B2
公开(公告)日：2022-03-22
申请号：US16683803
申请日：2019-11-14
Applicant: Allegro MicroSystems, LLC
Inventor： Aurelian Diaconu , Paul A. David
IPC: G01D5/14
Abstract: A sensor is disclosed for detecting an orientation of a magnet, the sensor comprising: a first sensor array including a first plurality of sensor elements that are arranged along a first line; a second sensor array including a second plurality of sensor elements that are arranged along a second line; and a processing circuitry configured to: detect a magnetic field produced by the magnet by using the first sensor array, and identify a first point on the first line where at least one component of the magnetic field has a predetermined value; detect the magnetic field by using the second sensor array, and identify a second point on the second line where at least one component of the magnetic field has the predetermined value; detect an orientation of the magnet relative to the sensor based on the first point and the second point; and output an indication of the orientation of the magnet based on the first point and the second point.
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公开(公告)号：US20210148731A1
公开(公告)日：2021-05-20
申请号：US16683803
申请日：2019-11-14
Applicant: Allegro MicroSystems, LLC
Inventor： Aurelian Diaconu , Paul A. David
IPC: G01D5/14
Abstract: A sensor is disclosed for detecting an orientation of a magnet, the sensor comprising: a first sensor array including a first plurality of sensor elements that are arranged along a first line; a second sensor array including a second plurality of sensor elements that are arranged along a second line; and a processing circuitry configured to: detect a magnetic field produced by the magnet by using the first sensor array, and identify a first point on the first line where at least one component of the magnetic field has a predetermined value; detect the magnetic field by using the second sensor array, and identify a second point on the second line where at least one component of the magnetic field has the predetermined value; detect an orientation of the magnet relative to the sensor based on the first point and the second point; and output an indication of the orientation of the magnet based on the first point and the second point.
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公开(公告)号：US20200284676A1
公开(公告)日：2020-09-10
申请号：US16295131
申请日：2019-03-07
Applicant: Allegro MicroSystems, LLC
Inventor： Bryan Cadugan , Paul A. David , Jason Boudreau , William P. Taylor
IPC: G01L9/00
Abstract: A pressure sensor includes a conductive substrate having a cavity which forms a thin portion that can be deformed by a pressure differential. A magnetic field sensor has at least one coil responsive to a changing coil drive signal and positioned proximate to the thin portion of the substrate that induces eddy currents in the thin portion that generate a reflected magnetic field. Magnetic field sensing elements detect the reflected magnetic field and generate a magnetic field signal. The magnetic field sensor is positioned so that deformation of the thin portion of the substrate causes a distance between the thin portion of the substrate and the magnetic field sensor to change.
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Patent Agency Ranking
公开(公告)号：US20200225020A1
公开(公告)日：2020-07-16
申请号：US16244452
申请日：2019-01-10
Applicant: Allegro MicroSystems, LLC
Inventor： Rémy Lassalle-Balier , Jeffrey Eagen , Andrea Foletto , Paul A. David
Abstract: Methods and apparatus for s sensor having magnetic field sensing elements coupled in a differential bridge and a signal processor configured to receive signals from the bridge to determine a distance from the magnetic field sensing elements to a magnet from flux line divergence of magnetic flux generated by the magnet.
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公开(公告)号：US10585152B2
公开(公告)日：2020-03-10
申请号：US16018291
申请日：2018-06-26
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , William P. Taylor
Abstract: In one aspect, an integrated circuit (IC) includes a sensor that includes a first magnetoresistive (MR) element and a second MR element less active to a presence of a magnetic field than the first MR element. The second MR element includes a metal layer diffused into other layers of the second MR element.
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公开(公告)号：US20190162784A1
公开(公告)日：2019-05-30
申请号：US15825879
申请日：2017-11-29
Applicant: Allegro MicroSystems, LLC
Inventor： Rémy Lassalle-Balier , Jeffrey Eagen , Paul A. David
IPC: G01R31/319 , G01R33/09
Abstract: A method of determining an error condition in a magnetic field sensor can include receiving a first bridge signal, the first bridge signal generated by a first full bridge circuit. The method can also include receiving a second bridge signal, the second bridge signal generated by a second full bridge circuit. The method can also include determining a bridge separation from the first bridge signal and the second bridge signal. The method can also include comparing a function of the bridge separation to a threshold value. The method can also include generating an error signal indicative of the error condition or not indicative of the error condition in response to the comparing.
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公开(公告)号：US10260905B2
公开(公告)日：2019-04-16
申请号：US15176655
申请日：2016-06-08
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , Eric G. Shoemaker , Jeffrey Eagen
Abstract: A magnetic field sensor can sense a movement of an object along a path. A movement line is tangent to the path. The magnetic field sensor can include a semiconductor substrate. The semiconductor substrate can have first and second orthogonal axes orthogonal to each other on the first surface of the substrate. A projection of the movement line onto a surface of the semiconductor substrate is only substantially parallel to the first orthogonal axis. The magnetic field sensor can also include first, second, third, and fourth magnetic field sensing elements disposed on the substrate. The first and second magnetic field sensing elements have maximum response axes parallel to the first orthogonal axis and the second and fourth magnetic field sensing elements have maximum response axes parallel to the second orthogonal axis. Signals generated by the second and fourth magnetic field sensing elements can be used as reference signals.
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公开(公告)号：US10012518B2
公开(公告)日：2018-07-03
申请号：US15176645
申请日：2016-06-08
Applicant: Allegro MicroSystems, LLC
Inventor： Paul A. David , Ravi Vig
Abstract: A back-biased magnetic field sensor uses one or more magnetic field sensing elements upon a substrate, each outside of a substrate region in which magnetic field lines are near perpendicular to the substrate and outside of which magnetic field lines are not to the substrate. The back-biased magnetic field sensor can sense an approaching and/or a retreating ferromagnetic object.
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