-
公开(公告)号：US20240175947A1
公开(公告)日：2024-05-30
申请号：US18070918
申请日：2022-11-29
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/09
CPC classification number: G01R33/091 , G01R33/098
Abstract: Magnetic field sensors having at least two bridges including MR elements are described. MR elements of each bridge have different magnetic reference directions. A first bridge is positioned to sense a first uniform magnetic field of a first polarity and a second bridge is positioned to sense a second uniform magnetic field of a second polarity opposite to the first polarity. The first and second uniform magnetic fields make up a differential field of interest. The described magnetic field sensors sense the field of interest in a manner that is immune to stray fields. Dual signal path embodiments are described in which outputs of the two bridges are independently processed and single signal path embodiments include a single signal path for processing the output of a combined (e.g., parallel) bridge arrangement.
-
公开(公告)号：US11768256B2
公开(公告)日：2023-09-26
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
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：US11624791B2
公开(公告)日：2023-04-11
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.
-
公开(公告)号：US11609283B2
公开(公告)日：2023-03-21
申请号：US17209471
申请日：2021-03-23
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/09
Abstract: In one aspect, bridge circuitry includes a first magnetoresistance (MR) element; a second MR element connected in series with the first MR element at a first node; a third MR element; a fourth MR element connected in series with the third MR element at a second node; a first switch connected at one end to a supply voltage and connected at the other end to the third MR element; a second switch connected at one end to ground and connected at the other end to the fourth MR element; a third switch connected at one end to ground and connected at the other end to the third MR element and the first switch; and a fourth switch connected at one end to the supply voltage and the other end to the fourth MR element and the second switch. The first and second MR elements are in parallel with the third and fourth MR elements.
-
公开(公告)号：US11578997B1
公开(公告)日：2023-02-14
申请号：US17410394
申请日：2021-08-24
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Octavio H. Alpago
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.
-
Patent Agency Ranking
公开(公告)号：US11467235B1
公开(公告)日：2022-10-11
申请号：US17333235
申请日：2021-05-28
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Octavio H. Alpago
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 first channel; a second channel; a subtractor circuit configured to subtract a second channel output signal from a first channel output signal to form a subtraction signal; an adder circuit configured to combine the first channel output signal and the second channel output signal to form a summation signal; processing circuitry configured to receive the summation signal and to provide a magnetic-field sensor output signal indicating a position of the target; feedback circuitry configured to receive the subtraction signal and to provide a first feedback signal to the processing circuitry, and a second feedback signal; and a secondary coil circuitry configured to receive the second feedback signal and to generate, based on the second feedback signal, a second magnetic-field signal to reduce the first magnetic-field signal received.
-
公开(公告)号：US11428755B2
公开(公告)日：2022-08-30
申请号：US15606332
申请日：2017-05-26
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
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：US11408945B2
公开(公告)日：2022-08-09
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.
-
公开(公告)号：US11262422B2
公开(公告)日：2022-03-01
申请号：US16870265
申请日：2020-05-08
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
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：US20210041511A1
公开(公告)日：2021-02-11
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.
-
-
-
-
-
-
-
-
-
Search Results
74
records
(took 0.03 seconds)
