Patents by Inventor Andreas P. Friedrich

Andreas P. Friedrich has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11022464
    Abstract: A magnetic field sensor includes one or more magnetic field sensing elements and a back-biased magnet arranged to avoid saturation of the one or more magnetic field sensing elements, particularly when the one or more magnetic field sensing elements comprise one or more magnetoresistance elements. The one or more magnetoresistance elements can be arranged in a resistor bridge.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: June 1, 2021
    Assignee: Allegro MicroSystems, LLC
    Inventors: Andreas P. Friedrich, Marie-Adelaide Lo, Andrea Foletto, Nicolas Yoakim
  • Publication number: 20210111284
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Applicant: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Paul A. David, P. Karl Scheller, Andreas P. Friedrich
  • Patent number: 10916665
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: February 9, 2021
    Assignee: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Paul A. David, P. Karl Scheller, Andreas P. Friedrich
  • Patent number: 10884031
    Abstract: Apparatus and methods provide a current sensor system including a plurality of current sensors positioned proximate a plurality of conductors. Each conductor is configured to carry a current to be measured. Each current sensor comprises one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field. The plurality of current sensors includes a first number of current sensors and the plurality of conductors includes a second number of conductors such that the first number is at least one more than the second number. A controller is coupled to receive the magnetic field signal from each of the current sensors and, for each magnetic field sensing element, is configured to characterize a magnetic coupling between the magnetic field sensing element and each of the plurality of conductors.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: January 5, 2021
    Assignee: Allegro MicroSystems, LLC
    Inventors: Yannick Vuillermet, Andreas P. Friedrich
  • Patent number: 10782152
    Abstract: A magnetic field sensor for determining a position of a magnet, the position identified by one or more position variables can include: one or more magnetic field sensing element operable to generate one or more magnetic field measurements of the magnet and an associated one or more measured magnetic field variable values; a first module for identifying calculated magnetic field variable values associated with a plurality of positions of the magnet; a second module operable to perform an optimization process to determine a value of a distance function, the distance function using the one or more measured magnetic field variable values and the calculated magnetic field variable values; and a third module operable to determine the position of the magnet by associating the value of the distance function with corresponding values of the one or more position variables. A complimentary method can be used in the magnetic field sensor.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: September 22, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Yannick Vuillermet, Andrea Foletto, Andreas P. Friedrich
  • Publication number: 20200116525
    Abstract: A magnetic field sensor includes one or more magnetic field sensing elements and a back-biased magnet arranged to avoid saturation of the one or more magnetic field sensing elements, particularly when the one or more magnetic field sensing elements comprise one or more magnetoresistance elements. The one or more magnetoresistance elements can be arranged in a resistor bridge.
    Type: Application
    Filed: October 11, 2018
    Publication date: April 16, 2020
    Applicant: Allegro MicroSystems, LLC
    Inventors: Andreas P. Friedrich, Marie-Adelaide Lo, Andrea Foletto, Nicolas Yoakim
  • Patent number: 10598515
    Abstract: A magnetic field sensor includes a back bias magnet to generate a DC magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. The first and second magnetic field sensing elements generate first and second electronic signals, respectively, in response to first and second sensed magnetic fields corresponding to the DC magnetic field but influenced by the at least one ferromagnetic surface. The magnetic field sensor generates a difference signal that is a difference of amplitudes of the first and second electronic signals. The difference signal is indicative of a rotation measurement of an absolute relative rotation of the ferromagnetic target object and the magnetic field sensor about a rotation axis.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: March 24, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Simon Tima, Yannick Vuillermet, Andreas P. Friedrich, Thomas Kerdraon
  • Publication number: 20200057097
    Abstract: Apparatus and methods provide a current sensor system including a plurality of current sensors positioned proximate a plurality of conductors. Each conductor is configured to carry a current to be measured. Each current sensor comprises one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field. The plurality of current sensors includes a first number of current sensors and the plurality of conductors includes a second number of conductors such that the first number is at least one more than the second number. A controller is coupled to receive the magnetic field signal from each of the current sensors and, for each magnetic field sensing element, is configured to characterize a magnetic coupling between the magnetic field sensing element and each of the plurality of conductors.
    Type: Application
    Filed: August 17, 2018
    Publication date: February 20, 2020
    Applicant: Allegro MicroSystems, LLC
    Inventors: Yannick Vuillermet, Andreas P. Friedrich
  • Patent number: 10520559
    Abstract: Hall effect elements are driven by current generators that use vertical epi resistors disposed away from an edge of a substrate upon which, within which, or over which, the Hall effect elements, the current generators, and the vertical epi resistors are disposed.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: December 31, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Juan Manuel Cesaretti, Andreas P. Friedrich, Gerardo A. Monreal, Alejandro Gabriel Milesi
  • Patent number: 10437312
    Abstract: A system and method for managing occupation of a shared space using a management system comprising a display device located at the shared space and a server, wherein the display device and the server include first interfaces configured for exchange of data and lower power second interfaces configured for signaling the presence of data to be exchanged, where the first interface is in an active mode by default and is placed into an active mode when the server sends a signal to the display device via the second interfaces, or when a user performs an action at the display device, that indicates there is data to be exchanged between the display device and the central server.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: October 8, 2019
    Assignee: ROOMZ S.A.
    Inventors: Roger Meier, Andreas P. Friedrich
  • Patent number: 10408639
    Abstract: A shifting device with two positive-locking shifting element halves includes a positive connection between the shifting element halves that is able to be established or released. The respective prevailing operating states of the shifting element halves are determined through a sensor device. The surface areas of an encoder contour relative to a measuring device are formed in a convex or concave manner, whereas a perpendicular gap between the surface areas of the encoder contour and a permanent magnet, starting from a joint area between the surface areas in the direction of an end area of the surface areas increases or decreases in each case.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: September 10, 2019
    Assignees: ZF FRIEDRICHSHAFEN AG, ALLEGRO MICROSYSTEMS, LLC
    Inventors: Stefan Hakspiel, Thomas Kerdraon, Andreas P. Friedrich
  • Patent number: 10385964
    Abstract: Embodiments provide systems and methods for determining a position of a gear shift lever of a vehicle. A ferromagnetic target object having selected characteristics influences a magnetic field generated by a back bias magnet. A magnetic field sensor includes magnetic field sensing elements disposed proximate to the target object. Each magnetic field sensing element generates an electronic signal in response to sensed magnetic fields. The gear shift lever moves among a plurality of gears of the vehicle. The magnetic field sensor selects a set of the magnetic field sensing elements to determine a magnetic field difference based on a difference of amplitudes between the electronic signals that is related to a current position of the gear shift lever. Characteristics of the target object enable the magnetic field sensor to detect the position of the gear shift lever. The characteristics include edges proximate to a perimeter of the target object.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: August 20, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Yannick Vuillermet, C├ędric Gillet, Andrea Foletto, Andreas P. Friedrich
  • Patent number: 10386427
    Abstract: A magnetic field sensor for sensing a direction of a magnetic field in an x-y plane, can include a first plurality of magnetic field sensing elements operable to generate a first plurality of magnetic field signals and a second plurality of magnetic field sensing elements operable to generate a second plurality of magnetic field signals. The magnetic field sensor can also include at least one sequence switches circuit operable to select ones of the first plurality of magnetic field signals and to select ones of the second plurality of magnetic field signals. The magnetic field sensor can also include a processing circuit operable to combine the selected ones of the first plurality of magnetic field signals and the selected ones of the second plurality of magnetic field signals to generate at least one sequential signal and to process the at least one sequential signal to generate an x-y angle signal indicative of a direction of the magnetic field in the x-y direction. An associated method is described.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: August 20, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Andreas P. Friedrich, Andrea Foletto, Nicolas Yoakim
  • Publication number: 20190250222
    Abstract: A magnetic field sensor for sensing a direction of a magnetic field in an x-y plane, can include a first plurality of magnetic field sensing elements operable to generate a first plurality of magnetic field signals and a second plurality of magnetic field sensing elements operable to generate a second plurality of magnetic field signals. The magnetic field sensor can also include at least one sequence switches circuit operable to select ones of the first plurality of magnetic field signals and to select ones of the second plurality of magnetic field signals. The magnetic field sensor can also include a processing circuit operable to combine the selected ones of the first plurality of magnetic field signals and the selected ones of the second plurality of magnetic field signals to generate at least one sequential signal and to process the at least one sequential signal to generate an x-y angle signal indicative of a direction of the magnetic field in the x-y direction. An associated method is described.
    Type: Application
    Filed: February 9, 2018
    Publication date: August 15, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Andreas P. Friedrich, Andrea Foletto, Nicolas Yoakim
  • Patent number: 10323958
    Abstract: An assembly has a base structure, a rotatable structure, a first magnet coupled to the base structure, a second magnet coupled to the rotatable structure, and a magnetic field sensor. The magnetic field sensor can identify at least one condition (i.e., position) of the assembly.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: June 18, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Stefan Kranz, Stephan Schurt, Andreas P. Friedrich, Yannick Vuillermet
  • Publication number: 20190157465
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. Features include a multi-sloped taper to an inner surface of a non-contiguous central region of the ferromagnetic mold material, a separately formed element disposed in the non-contiguous central region, one or more slots in the lead frame, a molded ferromagnetic suppression device spaced from the non-conductive mold material and enclosing a portion of a lead, a passive device spaced from the non-conductive mold material and coupled to a plurality of leads, and a ferromagnetic bead coupled to a lead.
    Type: Application
    Filed: January 21, 2019
    Publication date: May 23, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Paul A. David, P. Karl Scheller, Andreas P. Friedrich
  • Patent number: 10234513
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die supporting a magnetic field sensing element, a non-conductive mold material enclosing the die and a portion of the lead frame, a ferromagnetic mold material secured to the non-conductive mold material and a securing mechanism to securely engage the mold materials. The ferromagnetic mold material may comprise a soft ferromagnetic material to form a concentrator or a hard ferromagnetic material to form a bias magnet. The ferromagnetic mold material may be tapered and includes a non-contiguous central region, as may be an aperture or may contain the non-conductive mold material or an overmold material. Further embodiments include die up, lead on chip, and flip-chip arrangements, wafer level techniques to form the concentrator or bias magnet, integrated components, such as capacitors, on the lead frame, and a bias magnet with one or more channels to facilitate overmolding.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: March 19, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Andreas P. Friedrich, Paul David, Marie-Adelaide Lo, Eric Burdette, Eric Shoemaker, Michael C. Doogue
  • Patent number: 10230006
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. An electromagnetic suppressor comprising a ferromagnetic material encloses a passive device spaced from the non-conductive mold material and coupled to a plurality of leads.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: March 12, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Paul A. David, P. Karl Scheller, Andreas P. Friedrich
  • Publication number: 20190056241
    Abstract: A magnetic field sensor for determining a position of a magnet, the position identified by one or more position variables can include: one or more magnetic field sensing element operable to generate one or more magnetic field measurements of the magnet and an associated one or more measured magnetic field variable values; a first module for identifying calculated magnetic field variable values associated with a plurality of positions of the magnet; a second module operable to perform an optimization process to determine a value of a distance function, the distance function using the one or more measured magnetic field variable values and the calculated magnetic field variable values; and a third module operable to determine the position of the magnet by associating the value of the distance function with corresponding values of the one or more position variables. A complimentary method can be used in the magnetic field sensor.
    Type: Application
    Filed: August 16, 2017
    Publication date: February 21, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Yannick Vuillermet, Andrea Foletto, Andreas P. Friedrich
  • Publication number: 20190049527
    Abstract: A magnetic field sensor includes a lead frame, a passive component, semiconductor die supporting a magnetic field sensing element and attached to the lead frame, a non-conductive mold material enclosing the die and at least a portion of the lead frame, and a ferromagnetic mold material secured to a portion of the non-conductive mold material. The lead frame has a recessed region and the passive component is positioned in the recessed region. The ferromagnetic mold material may comprise a soft ferromagnetic material to form a concentrator or a hard ferromagnetic material to form a bias magnet.
    Type: Application
    Filed: October 19, 2018
    Publication date: February 14, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Andreas P. Friedrich, Paul A. David, Marie-Adelaide Lo, Eric Burdette, Eric G. Shoemaker, Michael C. Doogue