公开(公告)号：US11073573B2

公开(公告)日：2021-07-27

申请号：US16851473

申请日：2020-04-17

Applicant: Allegro MicroSystems, LLC

Inventor： Alexander Latham ,  Michael C. Doogue ,  Jason Boudreau

IPC: G01R31/00 ,  G01R31/12 ,  G01R35/00 ,  G01D5/14 ,  G01D5/20 ,  G01N27/72 ,  G01N27/82 ,  H01F5/04 ,  G01R33/00 ,  G01R33/025 ,  G01R33/032 ,  G01R33/12 ,  G01N27/90 ,  H01F5/00 ,  H01F27/34

Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

公开(公告)号：US11061084B2

公开(公告)日：2021-07-13

申请号：US16295131

申请日：2019-03-07

Applicant: Allegro MicroSystems, LLC

Inventor： Bryan Cadugan ,  Paul A. David ,  Jason Boudreau ,  William P. Taylor

IPC: G01L9/00 ,  G01R33/00 ,  G01R33/07 ,  G01L13/02

Abstract: A pressure sensor includes a conductive substrate having a cavity which forms a thin portion that can be deformed by a pressure differential. A magnetic field sensor has at least one coil responsive to a changing coil drive signal and positioned proximate to the thin portion of the substrate that induces eddy currents in the thin portion that generate a reflected magnetic field. Magnetic field sensing elements detect the reflected magnetic field and generate a magnetic field signal. The magnetic field sensor is positioned so that deformation of the thin portion of the substrate causes a distance between the thin portion of the substrate and the magnetic field sensor to change.

公开(公告)号：US10649042B2

公开(公告)日：2020-05-12

申请号：US16394338

申请日：2019-04-25

Applicant: Allegro MicroSystems, LLC

Inventor： Alexander Latham ,  Michael C. Doogue ,  Jason Boudreau

IPC: G01R33/02 ,  G01R35/00 ,  G01D5/14 ,  G01D5/20 ,  G01N27/72 ,  G01N27/82 ,  G01R33/00 ,  G01R33/025 ,  G01R33/032 ,  G01R33/12 ,  G01N27/90 ,  H01F5/00 ,  H01F27/34

Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

公开(公告)号：US20190250220A1

公开(公告)日：2019-08-15

申请号：US16394338

申请日：2019-04-25

Applicant: Allegro MicroSystems, LLC

Inventor： Alexander Latham ,  Michael C. Doogue ,  Jason Boudreau

IPC: G01R33/00 ,  G01R33/032 ,  H01F5/00 ,  G01N27/90 ,  G01R33/12 ,  G01R33/025

CPC classification number: G01R33/0094 ,  G01N27/90 ,  G01R33/0005 ,  G01R33/0011 ,  G01R33/0017 ,  G01R33/0029 ,  G01R33/025 ,  G01R33/032 ,  G01R33/1284 ,  H01F5/003 ,  H01F2027/348

Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

公开(公告)号：US20180340986A1

公开(公告)日：2018-11-29

申请号：US15606332

申请日：2017-05-26

Applicant: Allegro MicroSystems, LLC ,  COMMISSARIAT À L'É;NERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

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

IPC: G01R33/00

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.