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公开(公告)号：US20230077015A1
公开(公告)日：2023-03-09
申请号：US17466202
申请日：2021-09-03
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham , Hernán D. Romero
IPC: G01L3/10
Abstract: Methods and apparatus for linear inductive torque sensing that may include transmitting an AC magnetic field with a transmit coil toward a conductive target and receiving a field reflected by the conductive target with a receive coil, wherein the conductive target comprises first and second targets positioned with respect to each other and each shaped to linearly increase or decrease an amount of conductive area of the conductive target due to relative movement of the first and second targets which changes an amount of the field reflected by the conductive target. A signal from the receive coil can be processed to determine a relative position of the first and second targets corresponding to an amount of torque on an elongate member connected to the first and second targets. In other embodiments, a change in inductance of the transmit coil is measured to determine relative target position.
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公开(公告)号：US20230027608A1
公开(公告)日：2023-01-26
申请号：US17937556
申请日：2022-10-03
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: In one aspect, a magnetic-field sensor includes main coil circuitry configured to generate a first magnetic field signal at a first frequency. A reflected signal is generated from a target caused by the first signal generated by the main coil circuitry. The magnetic field sensor also includes magnetoresistance circuitry configured to receive an error signal. The error signal is formed from a combination of the reflected signal and a second magnetic field signal. The magnetic-field sensor further includes analog circuitry configured to receive an output signal from the magnetoresistance circuitry, digital circuitry configured to receive an output signal from the analog circuitry, a mixer configured to receive a feedback signal from one of the digital circuitry or the analog circuitry, and secondary coil circuitry configured to receive a driver signal from the mixer causing the secondary coil circuitry to generate the second magnetic field signal at the first frequency.
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33.发明申请公开(公告)号：US20220308131A1
公开(公告)日：2022-09-29
申请号：US17663062
申请日：2022-05-12
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: In one aspect, bridge circuitry includes a first magnetoresistance (MR) element connected with a second MR element at a first node; a third MR element connected with the first MR element at a second node; a fourth MR element connected with the third MR element at a third node; a fifth MR element connected with a sixth MR element at a fourth node; a seventh MR element connected with the fifth MR element at a fifth node; and an eighth MR element connected with the seventh MR element at a sixth node; and a plurality of eight switches. Six of the plurality of eight switches are each connected to a corresponding one node.
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公开(公告)号：US20220236347A1
公开(公告)日：2022-07-28
申请号：US17659515
申请日：2022-04-18
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/09
Abstract: Magnetic-field sensors use magnetic closed-loops with magnetic-field sensing elements, e.g., magnetoresistance (MR) elements, and diagnostic circuitry operating in a separate frequency band than that used for magnetic field sensing. The MR elements can be used in a first stage of a high gain amplifier which provides a feedback signal to a feedback coil in a feedback configuration to provide a magnetic feedback field. The magnetic feedback field attenuates the sensed magnetic field so that the MR elements operate in a linear range. Magnetic stray field effects and any limited linearity of magnetic-field sensing elements can be masked by the loop gain of the closed loop. For a magnetic closed-loop, a negative feedback configuration can be used or a positive feedback configuration can be used with a loop-gain of less than one. The diagnostic signal traverses the closed-loop and provides information regarding correct or incorrect functioning of the loop components.
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公开(公告)号：US11073577B2
公开(公告)日：2021-07-27
申请号：US16533030
申请日：2019-08-06
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Octavio H. Alpago
IPC: G01R33/09
Abstract: Methods and apparatus for a TMR-based sensor having a first magnetic field sensing element comprising a bridge having first, second, third, and fourth legs. Legs of the bridge comprise TMR elements with pillars connected to one or more switch matrixes to adjust total resistances of the bridge legs. Equalizing the resistance of the bridge legs can enhance sensor performance.
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Patent Agency Ranking
36.发明申请公开(公告)号：US20200319272A1
公开(公告)日：2020-10-08
申请号：US16372603
申请日：2019-04-02
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Roman Prochazka , Martin Drinovsky
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.
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公开(公告)号：US20190312579A1
公开(公告)日：2019-10-10
申请号：US15947251
申请日：2018-04-06
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: A magnetic field sensor comprises a substrate, a first coil supported by the substrate and configured to carry a first current in a first direction to generate a first magnetic field, and a second coil supported by the substrate and nested within the first coil to form a gap between the first and second coils, the second coil configured to carry a second current in a second, opposite direction to generate a second magnetic field. A plurality of magnetic field sensing elements is configured to detect the first and second magnetic fields. A switching network is coupled to the plurality of magnetic field sensing elements and configured to connect the plurality of magnetic field sensing elements to form a first bridge circuit having a first arrangement of the magnetic field sensing elements and a second bridge circuit having a second arrangement of the magnetic field sensing elements.
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公开(公告)号：US20190113592A1
公开(公告)日：2019-04-18
申请号：US16214768
申请日：2018-12-10
Applicant: Allegro MicroSystems, LLC
Inventor： Nicolas Rigoni , Octavio H. Alpago , Nicolas Rafael Biberidis , Hernán D. Romero
Abstract: A magnetic field sensor includes a first magnetic field sensing element first generating a first signal having a first axis of maximum sensitivity, a second magnetic field sensing element for generating a second signal and having a second axis of maximum sensitivity, one or more detectors for receiving an output of the first magnetic field sensing element or the second magnetic field sensing element, and a processor that receives an output of the one or more detectors and uses the output of the one or more detectors to calculate a first constant Kc and a second constant Ks and then uses Kc and Ks to compensate for an orthogonality error between the first axis of maximum sensitivity and second axis of maximum sensitivity. The detectors include peak detectors and/or zero-crossing detectors that compare the output of the first input signal or the second input signal with a threshold or zero.
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公开(公告)号：US20180252779A1
公开(公告)日：2018-09-06
申请号：US15447507
申请日：2017-03-02
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
CPC classification number: G01R33/077 , G01R33/0029 , G01R33/072
Abstract: A magnetic field sensor includes a semiconductor substrate, a circular vertical Hall (CVH) sensing element comprising a plurality of Hall elements arranged over an implant region in a semiconductor substrate, adjacent ones of the plurality of vertical Hall element at predetermined angles from each other. A CVH output stage may comprise one or more of drive circuits to drive the plurality of vertical Hall elements and produce an analog signal, and a filter coupled to the CVH output stage to receive the analog signal. The filter may be configured to remove a DC component from the analog signal to produce a filtered signal. An analog-to-digital converter may be coupled to receive the filtered signal and produce a digital signal. A processor stage may be coupled to receive the filtered signal and operable to compute an estimated angle of the external magnetic field.
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公开(公告)号：US12176862B2
公开(公告)日：2024-12-24
申请号：US18051934
申请日：2022-11-02
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Pablo Aguirre
Abstract: An amplifier circuits inductive/magnetic sensor interface can include a main signal path including one or more amplifiers configured to receive an input signal and to produce an output signal based on the input signal. The input signal may include a square-wave demodulated signal having an associated modulation frequency and an undesired frequency component at twice the modulation frequency of the square-wave demodulated signal. The amplifier circuit may include a gain feedback loop configured to set a gain of the amplifier circuit. The amplifier circuit may include a ripple reduction feedback loop configured to receive an intermediate signal on the main signal path and extract the undesired frequency component of the intermediate signal to produce a filtered version of the intermediate signal and provide the filtered version of the intermediate signal to the main signal path.
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