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    Current sense calibration in a motor control system
    14.
    发明授权
    Current sense calibration in a motor control system 有权

    公开(公告)号：US11621657B1

    公开(公告)日：2023-04-04

    申请号：US17648165

    申请日：2022-01-17

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andrea Foletto ,  Daniel Jacques

    IPC: H02P6/28 ,  H02P27/08

    Abstract: A motor control system includes a gate driver motor controller and a microcontroller configured to generate a commutation command signal for coupling to the gate driver motor controller. The gate driver motor controller includes a current measurement circuit to measure current in each of three current paths corresponding to three motor windings, an interface to transmit a first subset of the measured currents corresponding to a first subset of the current paths, and a calibrator to calibrate a current path that is not part of the first subset of current paths when the first subset of the measured currents is transmitted. The microcontroller includes an interface to receive the first subset of measured currents and a processor to compute the current in the current path that is not part of the first subset of current paths based on the first subset of measured currents.

    Use Of Channel Information To Generate Redundant Angle Measurements On Safety Critical Applications
    15.
    发明申请
    Use Of Channel Information To Generate Redundant Angle Measurements On Safety Critical Applications 有权

    公开(公告)号：US20230003503A1

    公开(公告)日：2023-01-05

    申请号：US17363732

    申请日：2021-06-30

    Applicant: Allegro MicroSystems, LLC

    Inventor： Juan Manuel Cesaretti ,  Andrea Foletto

    IPC: G01B7/30 ,  G01D5/14 ,  G01D18/00

    Abstract: A sensor system and method use channel information to generate redundant angle measurements for sensing rotation of magnets about a given axis of rotation. It was observed that magnetic field strength on a circle, centered on the axis of rotation but in a plane perpendicular to it, have a component parallel to the axis that varies sinusoidally as a function of the angle around the circle. By placing magnetic field sensors equiangularly around such a circle, and summing their field strengths with appropriate weights, the angle of magnet rotation may be computed in a manner that is immune to the presence of stray fields. Moreover, fewer than all channels of sense data may be combined to form redundant estimates of the angle of rotation, to permit continued operation when one of the sensors has failed.

    Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device
    18.
    发明授权
    Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device 有权

    公开(公告)号：US10066965B2

    公开(公告)日：2018-09-04

    申请号：US15466894

    申请日：2017-03-23

    Applicant: Allegro MicroSystems, LLC

    Inventor： Andrea Foletto ,  Peter Cisar ,  Eric Shoemaker

    IPC: G01B7/30 ,  G01D5/14 ,  G01D18/00

    Abstract: A magnetic field sensor includes a magnetic field sensing element configured to generate a magnetic field signal; a measured threshold module configured to generate a measured threshold signal in accordance with positive peaks and negative peaks of the magnetic field signal; a memory device coupled to receive and configured to store, at each one of a plurality of storage times, a respective value of the measured threshold signal; a threshold module coupled to receive from the memory device, at a calculation time, a stored value of the measured threshold signal and configured to generate a calculated threshold value; and a comparison circuit coupled to receive the calculated threshold value and to receive the magnetic field signal. The comparison circuit is configured to compare the calculated threshold value with the magnetic field signal to generate an output signal. A corresponding method is associated with the magnetic field sensor.

    METHOD AND SYSTEM FOR PROVIDING INFORMATION ABOUT A TARGET OBJECT IN A FORMATTED OUTPUT SIGNAL
    20.
    发明申请
    METHOD AND SYSTEM FOR PROVIDING INFORMATION ABOUT A TARGET OBJECT IN A FORMATTED OUTPUT SIGNAL 审中-公开

    公开(公告)号：US20170219662A1

    公开(公告)日：2017-08-03

    申请号：US15010453

    申请日：2016-01-29

    Applicant: Allegro Microsystems, LLC

    Inventor： Seth Prentice ,  Andrea Foletto ,  Marcus Hagn

    IPC: G01R33/07

    CPC classification number: G01R33/07 ,  G08B25/045 ,  H03K5/08 ,  H03K7/08

    Abstract: The present disclosure is directed to methods and systems for providing information about a target based on pulse widths. The information can be provided in a formatted output signal which uses a pulse width protocol to code information by varying amplitudes and widths of successive pulses in an output signal pulse train portion. The method includes detecting a first feature of the target and in response to detecting the first feature, generating an output signal pulse train portion comprising two or more pulses with at least two of the pulses having different amplitudes and each of the two or more pulses having a width corresponding to a logic value. The widths of the two or more pulses in the output signal pulse train portion can be measured in response to the detected first feature reaching a first amplitude threshold, whereby the widths can correspond to different logic values.

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