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公开(公告)号：US09739847B1
公开(公告)日：2017-08-22
申请号：US15012125
申请日：2016-02-01
Applicant: Allegro Microsystems, LLC
Inventor： Octavio H. Alpago , Ezequiel Alves , Hernán D. Romero
CPC classification number: G01R33/077 , G01D5/145 , G01D5/2448 , G01R33/0029 , H02K29/08
Abstract: A magnetic field sensor comprises a circular vertical Hall (CVH) sensing element having a plurality of vertical Hall elements. A CVH output stage is included comprising one or more of drive circuits to drive the plurality of vertical Hall elements and produce an analog signal representing a strength of an external magnetic field as detected by the plurality of vertical Hall elements. An analog-to-digital converter is coupled to receive the analog signal and produce a digital signal. A quadrature modulator circuit is coupled to the digital signal and operable to generate a plurality of quadrature modulated signals. A processor stage receives signals representative of the plurality of quadrature modulated signals and computes an estimated angle of the external magnetic field.
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公开(公告)号：US12174271B2
公开(公告)日：2024-12-24
申请号：US17525224
申请日：2021-11-12
Applicant: Allegro MicroSystems, LLC
Inventor： David J. Haas , Hernán D. Romero
Abstract: A method is provided for use in a sensor, the method comprising: selecting a switching cycle for the sensor; transitioning the sensor into a state in which at least one component of the sensor is periodically turned on and off in accordance with the switching cycle; sampling an analog signal to generate a sampled signal, the analog signal being generated by at least one sensing element, the analog signal being sampled only during periods in which the at least one component of the sensor is turned on; and generating an output signal based, at least in part, on the sampled signal and outputting the output signal.
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公开(公告)号：US11927650B2
公开(公告)日：2024-03-12
申请号：US17659515
申请日：2022-04-18
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
CPC classification number: G01R33/098 , G01R33/091
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：US20230062642A1
公开(公告)日：2023-03-02
申请号：US17929326
申请日：2022-09-02
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/07
Abstract: A sensor, comprising: a substrate having a reference crystal orientation and a plurality of vertical Hall element pairs that are formed on the substrate. Each vertical Hall element pair includes: (i) a respective first vertical Hall element that is oriented at a respective first angle relative to the reference crystal orientation of the substrate and (ii) a respective second vertical Hall element that is oriented at a respective second angle relative to the reference crystal orientation of the substrate. The substrate has a rectangular shape, and each of the vertical Hall element pairs is disposed in a different respective corner of the substrate.
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15.发明申请公开(公告)号：US20220342010A1
公开(公告)日：2022-10-27
申请号：US17238543
申请日：2021-04-23
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Gerardo A. Monreal
Abstract: An electronic circuit can have a first plurality of vertical Hall elements and a second plurality of vertical Hall elements all disposed on a substrate having a plurality of crystal unit cells, wherein the first plurality of vertical Hall elements have longitudinal axes disposed within five degrees of parallel to an edge of the crystal unit cells, and wherein the second plurality of vertical Hall elements have longitudinal axes disposed between eighty-five and ninety-five degrees relative to the longitudinal axes of the first plurality of vertical Hall elements.
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Patent Agency Ranking
公开(公告)号：US20220276071A1
公开(公告)日：2022-09-01
申请号：US17186346
申请日：2021-02-26
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
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.
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公开(公告)号：US20220221533A1
公开(公告)日：2022-07-14
申请号：US17147819
申请日：2021-01-13
Applicant: Allegro MicroSystems, LLC
Inventor： Bruno Luis Uberti , Gerardo A. Monreal , Hernán D. Romero
Abstract: A magnetic field sensor can be are based upon three element vertical Hall element building blocks, e.g., three element or six element vertical Hall element arrangements, all arranged in a circle. In some embodiments, the circle of vertical Hall elements can be arranged as a CVH sensing element.
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公开(公告)号：US20220155387A1
公开(公告)日：2022-05-19
申请号：US16951324
申请日：2020-11-18
Applicant: Allegro MicroSystems, LLC
Inventor： Craig S. Petrie , Hernán D. Romero , David J. Haas
Abstract: A magnetic field sensor includes a current source configured to generate a bias current, a plurality of magnetic field transducers, each having power terminals coupled to the current source and output terminals at which an output signal of the transducer is provided, wherein the power terminals of each of the plurality of magnetic field transducers are electrically coupled together in series so that the bias current flows through each of the plurality of magnetic field transducers in series. A capacitively-coupled summing amplifier has a plurality of inputs, each configured to receive the output signal of a respective one of the plurality of magnetic field transducers, and an output at which an amplified and summed signal is provided, wherein the capacitively-coupled summing amplifier is configured to amplify and sum the received output signals of the plurality of magnetic field transducers.
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公开(公告)号：US10917092B2
公开(公告)日：2021-02-09
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：US10794936B2
公开(公告)日：2020-10-06
申请号：US16139742
申请日：2018-09-24
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: A magnetic field sensor comprises a magnetoresistance element with a variable conductivity that changes based on a function of a magnetic field strength and angle of an external magnetic field and a voltage across the magnetoresistance element. A circuit is included to monitor an electrical current through the magnetoresistance element during operation and to apply a constant voltage across the magnetoresistance element based on the monitored electrical current so that the variable conductivity does not change as result of a changing voltage across the magnetoresistance element.
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