-
公开(公告)号：US11762043B2
公开(公告)日：2023-09-19
申请号：US17653240
申请日：2022-03-02
Applicant: Allegro MicroSystems, LLC
Inventor： Zachary Richards
CPC classification number: G01R33/09 , G01R33/072
Abstract: Methods and apparatus for determining and transmitting speed and/or direction information for a rotating target by a magnetic field sensor. A reference channel signal is generated for a target from at least one magnetic field sensing element and a virtual channel signal in quadrature with the reference channel signal is generated. A tangent signal is generated. A slope of an arctangent of the tangent signal is determined, wherein the slope corresponds to rotational speed of the target. The speed and/or direction of the target can be transmitted by a sensor IC.
-
公开(公告)号：US20200081073A1
公开(公告)日：2020-03-12
申请号：US16686419
申请日：2019-11-18
Applicant: Allegro MicroSystems, LLC
Inventor： Zachary Richards
Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other. A controller responsive to the measured magnetic field signals is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. The controller is configured to calculate a virtual tangent of the virtual magnetic field signal and at least one measured magnetic field signal and compute a second derivative of an arctangent extraction of the virtual tangent. Coefficients used to generate the virtual magnetic field signals are regulated in a feedback system in order to achieve a desired phase difference between a reference and a virtual magnetic field signal.
-
公开(公告)号：US10908229B2
公开(公告)日：2021-02-02
申请号：US16686419
申请日：2019-11-18
Applicant: Allegro MicroSystems, LLC
Inventor： Zachary Richards
Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other. A controller responsive to the measured magnetic field signals is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. The controller is configured to calculate a virtual tangent of the virtual magnetic field signal and at least one measured magnetic field signal and compute a second derivative of an arctangent extraction of the virtual tangent. Coefficients used to generate the virtual magnetic field signals are regulated in a feedback system in order to achieve a desired phase difference between a reference and a virtual magnetic field signal.
-
Patent Agency Ranking
公开(公告)号：US20200080867A1
公开(公告)日：2020-03-12
申请号：US16686439
申请日：2019-11-18
Applicant: Allegro MicroSystems, LLC
Inventor： Andrea Foletto , Zachary Richards
Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate an angle signal and to compare the angle signal to at least one angle signal threshold. The angle signal can be compared to a plurality of angle signal thresholds to generate a plurality of output transitions, each output transitions indicative of the angle signal crossing the corresponding angle signal threshold. The number of angle signal thresholds can be dependent upon a desired number of output transitions per pole-pair of the angle signal.
-
公开(公告)号：US20190383886A1
公开(公告)日：2019-12-19
申请号：US16290017
申请日：2019-03-01
Applicant: Allegro MicroSystems, LLC
Inventor： Eric G. Shoemaker , Zachary Richards , Andrea Foletto
Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. In embodiments, the virtual magnetic field signal has the second predetermined phase difference with respect to each of the at least two measured magnetic field signals.
-
公开(公告)号：US20250027760A1
公开(公告)日：2025-01-23
申请号：US18354895
申请日：2023-07-19
Applicant: Allegro MicroSystems, LLC
Inventor： Zachary Richards , Alexander Latham , Rémy Lassalle-Balier , Solène Bastien , Mathew Drouin
Abstract: A system is provided comprising: a first target including a plurality of first teeth; and a second target that is coupled to the first target via a mechanical link, the second target including a plurality of second teeth, the second target being disposed above or below the first target, the plurality of first teeth including a different number of teeth than the plurality of second teeth, wherein the first target and the second target are configured to generate respective magnetic fields in response to one or more excitation magnetic fields, the respective magnetic fields being usable to measure a twisting force that is incident on the mechanical link that couples the first target to the second target.
-
公开(公告)号：US20220291304A1
公开(公告)日：2022-09-15
申请号：US17653240
申请日：2022-03-02
Applicant: Allegro MicroSystems, LLC
Inventor： Zachary Richards
Abstract: Methods and apparatus for determining and transmitting speed and/or direction information for a rotating target by a magnetic field sensor. A reference channel signal is generated for a target from at least one magnetic field sensing element and a virtual channel signal in quadrature with the reference channel signal is generated. A tangent signal is generated. A slope of an arctangent of the tangent signal is determined, wherein the slope corresponds to rotational speed of the target. The speed and/or direction of the target can be transmitted by a sensor IC.
-
公开(公告)号：US10598739B2
公开(公告)日：2020-03-24
申请号：US16290017
申请日：2019-03-01
Applicant: Allegro MicroSystems, LLC
Inventor： Eric G. Shoemaker , Zachary Richards , Andrea Foletto
Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate at least one virtual magnetic field signal having a second predetermined phase difference with respect to at least one of the measured magnetic field signals. In embodiments, the virtual magnetic field signal has the second predetermined phase difference with respect to each of the at least two measured magnetic field signals.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.016 seconds)
