公开(公告)号：US20230060295A1

公开(公告)日：2023-03-02

申请号：US17410394

申请日：2021-08-24

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero ,  Octavio H. Alpago

IPC: G01D5/16 ,  G01R33/09

Abstract: A magnetic field angle sensor includes a coil configured to generate a magnetic field that induces an eddy current in a rotatable target, a first magnetic field sensing structure positioned proximate to the coil and configured to detect a reflected magnetic field generated by the eddy current induced in the target, a second magnetic field sensing structure positioned proximate to the coil and configured to detect the reflected magnetic field generated by the eddy current induced in the target, wherein the first and second magnetic field sensing structures are configured to detect quadrature components of the reflected magnetic field, and a processing module configured to process the reflected magnetic field detected by the first and second magnetic field sensing structures for determining an angular position of the target.

公开(公告)号：US11493361B2

公开(公告)日：2022-11-08

申请号：US17186346

申请日：2021-02-26

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01B7/14 ,  G01B7/30 ,  G01R33/00 ,  G01D5/14 ,  G01B7/00 ,  G01D11/24 ,  G01D5/20

Abstract: A magnetic field sensor includes: a substrate; a transmission coil formed on the substrate, the transmission coil being configured to generate a direct magnetic field; a sensing bridge that is formed on the substrate, the sensing bridge being configured to detect the direct magnetic field and a reflected magnetic field that is generated by a target, the reflected magnetic field being generated in response to eddy currents that are induced in the target by the direct magnetic field; a processing circuitry being configured to generate an output signal that is indicative of a position of the target, the output signal being generated by normalizing a first signal with respect to a second signal, the first signal being generated at least in part by using the sensing bridge, and the second signal being generated at least in part by using the sensing bridge, wherein the second signal is based on the detected direct magnetic field.

公开(公告)号：US20220342007A1

公开(公告)日：2022-10-27

申请号：US17810461

申请日：2022-07-01

Applicant: Allegro MicroSystems, LLC ,  Commissariat à l'énergie atomique et aux énergies alternatives

Inventor： Alexander Latham ,  Claude Fermon ,  Jason Boudreau ,  Myriam Pannetier-Lecoeur ,  Bryan Cadugan ,  Hernán D. Romero

IPC: G01R33/00 ,  G01B7/00 ,  G01D5/14 ,  G01R33/09 ,  G01R33/07

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

公开(公告)号：US11307017B2

公开(公告)日：2022-04-19

申请号：US16749074

申请日：2020-01-22

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01B7/30 ,  H03F3/45 ,  G01R1/00

Abstract: In one aspect, an angle sensor includes analog circuitry configured to generate an analog value having a tangent value, an analog-to-digital converter configured to convert the analog value to a digital value and digital circuitry configured to receive the digital value. The analog circuitry includes a plurality of magnetoresistance elements that include a first magnetoresistance element configured to provide a cosine value indicative of a magnetic field along a first axis and a second magnetoresistance element configured to provide a sine value indicative of the magnetic field along a second axis orthogonal to the first axis. The tangent value is determined by the cosine and sine values. The digital circuitry includes an angle processor configured to use the digital value and a fixed value in an arctangent algorithm to generate an angle of a direction of the magnetic field.

公开(公告)号：US20220075008A1

公开(公告)日：2022-03-10

申请号：US17015132

申请日：2020-09-09

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01R33/07 ,  G01R33/00 ,  G01D5/14

Abstract: An apparatus comprising: a ring magnet having first surface, a second surface, and a bore extending from the first surface to the second surface, the bore having a central longitudinal axis; a substrate disposed inside the bore, the substrate having a first axis and a second axis; a first group of magnetic field sensing elements that are formed on the substrate, the first group of magnetic field sensing elements including a first in plane magnetic transducer and a second magnetic field sensing element, the first magnetic field sensing element being aligned with the first axis and the second magnetic field sensing element being aligned with the second axis; and a second group of magnetic field sensing elements that are formed on the substrate, the second group of magnetic field sensing elements including a third magnetic field sensing element and a fourth magnetic field sensing element, the third magnetic field sensing element being aligned with the first axis, and the fourth MR element being aligned with the second axis.

公开(公告)号：US20210349163A1

公开(公告)日：2021-11-11

申请号：US16870265

申请日：2020-05-08

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01R33/09 ,  G01D5/16

Abstract: A sensor comprising: a first magnetoresistive (MR) bridge having a first stray field sensitivity; a second MR bridge having a second stray field sensitivity; and a driver circuitry configured to: (i) supply a first voltage to the first MR bridge, and (ii) supply a second voltage to the second MR bridge that is different from the first voltage, wherein supplying the first voltage and the second voltage to the first MR bridge and the second MR bridge, respectively, causes the first stray field sensitivity to match the second stray field sensitivity.

公开(公告)号：US20210223023A1

公开(公告)日：2021-07-22

申请号：US16749074

申请日：2020-01-22

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01B7/30 ,  H03F3/45

Abstract: In one aspect, an angle sensor includes analog circuitry configured to generate an analog value having a tangent value, an analog-to-digital converter configured to convert the analog value to a digital value and digital circuitry configured to receive the digital value. The analog circuitry includes a plurality of magnetoresistance elements that include a first magnetoresistance element configured to provide a cosine value indicative of a magnetic field along a first axis and a second magnetoresistance element configured to provide a sine value indicative of the magnetic field along a second axis orthogonal to the first axis. The tangent value is determined by the cosine and sine values. The digital circuitry includes an angle processor configured to use the digital value and a fixed value in an arctangent algorithm to generate an angle of a direction of the magnetic field.

公开(公告)号：US11047933B2

公开(公告)日：2021-06-29

申请号：US16372603

申请日：2019-04-02

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero ,  Roman Prochazka ,  Martin Drinovsky

IPC: G01R33/07 ,  H03F3/00 ,  H03H19/00 ,  G01R33/00

Abstract: Magnetic field sensors and associated techniques use a Hall effect element in a current spinning arrangement in combination with a rippled reduction feedback network configured to reduce undesirable spectral components generated by the current spinning and other circuit elements.

公开(公告)号：US10823789B2

公开(公告)日：2020-11-03

申请号：US16139558

申请日：2018-09-24

Applicant: Allegro MicroSystems, LLC

Inventor： Conrado Rossi ,  Hernán D. Romero ,  Maria C. Costa

IPC: G01R33/028 ,  G01R33/07 ,  G01D5/14 ,  H01L43/04 ,  H01L43/06

Abstract: A driver circuit includes a power terminal, a reference terminal, and a bridge circuit. The bridge circuit comprises a first switch coupled to the power terminal, a second switch coupled in series between the first switch and the reference terminal to form a first output terminal between the first and second switches, a third switch coupled to the power terminal, and a fourth switch coupled in series between the third switch and the reference terminal to form a second output terminal between the third and fourth switches. The second and fourth switches are PNP BJT devices.

公开(公告)号：US10585147B2

公开(公告)日：2020-03-10

申请号：US15181889

申请日：2016-06-14

Applicant: Allegro MicroSystems, LLC

Inventor： Hernán D. Romero

IPC: G01C25/00 ,  G01R33/00 ,  G01P21/02 ,  G01D5/14 ,  G01D3/036 ,  G01R33/07 ,  G01R33/09 ,  G01P3/487

Abstract: A magnetic field sensor includes a first magnetic field sensing element configured to produce a first signal representing a detected external magnetic field; a circular vertical hall element configured to produce a second signal representing an amplitude of the external magnetic field; and an error compensation circuit coupled to receive the first and second signal, compute an error value based on the amplitude of the external magnetic field, and apply the error value to the first signal to compensate for an error in the first signal.