Patents Assigned to Allegro Microsystems Inc.
  • Patent number: 10088533
    Abstract: An integrated magnetic field sensor includes a magnetic field sensing circuit and a power driving circuit disposed upon or within a common substrate. A method of powering on and off a load uses the above integrated magnetic field sensor.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: October 2, 2018
    Assignee: Allegro MicroSystems, Inc.
    Inventors: Manuel Rivas, Gerardo A. Monreal, Christine M. Graham, Eric G. Shoemaker
  • Publication number: 20140292247
    Abstract: A motor driver includes at least two terminals suitable for being coupled to a motor controller and to receive a motor command signal and transmit a motor status signal when the motor driver is controlling a motor. A serial data communication circuit may be configured to send and receive serial data over the at least two terminals when the at least two terminals are idle.
    Type: Application
    Filed: March 27, 2013
    Publication date: October 2, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Chee-Kiong Ng, Christopher Alger, Timothy Reynolds
  • Publication number: 20140264678
    Abstract: In one aspect, a method includes processing a metal substrate, performing a first etch on a first surface of the metal substrate to form, for an integrated circuit package, secondary leads and a curved component having two primary leads and performing a second etch, on a second surface of the substrate opposite the first surface, at locations on the secondary leads and locations on the curved component to provide a locking mechanism. Each primary lead located at a respective end of the curved component.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: SHIXI LOUIS LIU, Harianto Wong, Paul David, John B. Sauber, Shaun D. Milano, Raguvir Kanda, Bruce Hemenway
  • Publication number: 20140264667
    Abstract: A vertical Hall Effect element includes one or more of: a low voltage P-well region disposed at a position between pickups of the vertical Hall Effect element, Light-N regions disposed under the pickups, a pre-epi implant region, or two epi regions to result in an improved sensitivity of the vertical Hall Effect element. A method results in the vertical Hall Effect element having the improved sensitivity.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Yigong Wang, Richard B. Cooper
  • Publication number: 20140266323
    Abstract: An electronic circuit for driving an electronic switch includes a first voltage terminal coupled to receive a first voltage from a power supply and a second voltage terminal coupled to receive a second voltage from the power supply. A driver circuit is configured to drive the voltage at a control terminal of the electronic switch to an intermediate voltage level in order to turn on the electronic switch during a high or normal voltage condition. A clamp circuit is configured to clamp the voltage at the control terminal of the electronic switch to the second voltage terminal in order to turn on the electronic switch during a low voltage condition, so that the electronic switch can enhance power provided to a load during the low voltage condition. A low voltage detection circuit detects the low voltage condition and provides a signal to activate the clamp circuit.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: James McIntosh, Christy Looby
  • Publication number: 20140266181
    Abstract: Methods and apparatus for magnetic field sensor having a sensing element, an analog circuit path coupled to the sensing element for generating an output voltage in response to a magnetic field applied to the sensing element, and a coil in proximity to the sensing element, the coil having a first terminal that is accessible external to the magnetic field sensor.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Shaun D. Milano, Michael C. Doogue, William P. Taylor
  • Publication number: 20140176126
    Abstract: Magnetic field sensor arrangements and methods provide a magnetic field sensor positioned proximate to a magnet with an axis of sensitivity aligned relative to the magnet in orientations that provide a good sensitivity and a mechanical difference from other arrangements.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Andreas P. Friedrich, Nicolas Yoakim, Andrea Foletto
  • Publication number: 20140062358
    Abstract: A motor control circuit and associated techniques can adjust a phase of a motor drive to keep a rotational reference position of an electric motor at the same relative phase as a zero current in a motor winding at different motor speeds and as the motor accelerates and decelerates. In some embodiments, a particular circuit and technique can be used to detect the zero current in the motor winding.
    Type: Application
    Filed: August 30, 2012
    Publication date: March 6, 2014
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Timothy Reynolds, Chengyi Jin
  • Publication number: 20140062365
    Abstract: A motor control circuit and associated techniques detect a zero crossing of a current in a motor winding by detecting a revers current in a half bridge circuit used to drive the motor winding.
    Type: Application
    Filed: August 30, 2012
    Publication date: March 6, 2014
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Timothy Reynolds, Chengyi Jin
  • Publication number: 20140055064
    Abstract: Electronic circuits for controlling the speed of a motor include a receiving node coupled to receive a speed command signal representative of a desired final speed of the motor. A speed control circuit applies a selected amount of power to a motor to allow a speed of the motor to approach a predetermined final speed, where the selected amount of power provided is based on the desired final speed of the motor. A signal represents the speed of the motor and a feedback circuit uses the signal to regulate the speed of the motor by phase-locking the speed of the motor to the speed command signal once the speed of the motor falls within a predetermined threshold of the final speed. Methods for controlling the speed of a motor are also disclosed.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 27, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventor: Chee-Kiong Ng
  • Publication number: 20140055045
    Abstract: A control circuit used to control a DC-DC converter includes a duty cycle control unit to control a duty cycle of the DC-DC converter and a hysteretic control unit to maintain a voltage at an output of the DC-DC converter within a narrow range during certain operational time periods. The hysteretic control unit may maintain the converter output voltage within the range by alternately enabling and disabling the duty cycle control unit based on feedback from the DC-DC converter output. In at least one embodiment, the control circuit is used within LED driver circuitry for driving a plurality of LED channels.
    Type: Application
    Filed: August 22, 2012
    Publication date: February 27, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Pranav Raval, Gregory Szczeszynski, Bassem Alnahas
  • Publication number: 20140055051
    Abstract: An electronic circuit for driving a plurality of light emitting diode (LED) channels coupled to a common voltage node includes a priority queue for tracking a dominant LED channel. A queue manager may be provided to keep the priority queue updated during LED drive operations based on operating conditions associated with the LED channels.
    Type: Application
    Filed: August 22, 2012
    Publication date: February 27, 2014
    Applicant: Allegro Microsystems, Inc.
    Inventors: Pranav Raval, Gregory Szczeszynski, David Toebes
  • Publication number: 20140028290
    Abstract: A closed loop current sensor has a primary conductor and a plurality of secondary conductors. Selected ones of the plurality of secondary conductors are selected and driven in a feedback loop.
    Type: Application
    Filed: July 24, 2012
    Publication date: January 30, 2014
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventor: Craig S. Petrie
  • Publication number: 20140009144
    Abstract: Magnetic field sensors and associated techniques use a Hall effect element in a chopping arrangement in combination with a feedback path configured to reduce undesirable spectral components generated by the chopping.
    Type: Application
    Filed: July 5, 2012
    Publication date: January 9, 2014
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventor: Hernan D. Romero
  • Publication number: 20130342273
    Abstract: An electronic circuit has a differential amplifier with a differential transistor pair having two transistors. The electronic circuit also has two digital-to-analog converters, a respective one of the two digital-to-analog converters coupled to each respective one of the two transistors. Control bits adjust the DACs to provide an offset voltage adjustment of the differential amplifier.
    Type: Application
    Filed: June 26, 2012
    Publication date: December 26, 2013
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventor: Craig S. Petrie
  • Publication number: 20130335074
    Abstract: Magnetic field sensor and related techniques can identify passing conditions, failing conditions, and marginal conditions of a sensed object. The magnetic field sensor and techniques can use one or more peak values of a proximity signal representative of proximity of the object, DC offset values of the proximity signal, or threshold values related to an amplitude of a signal representative of the proximity signal to identify the conditions.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Daniel S. Dwyer, Christine Graham, P. Karl Scheller
  • Publication number: 20130335068
    Abstract: Magnetic field sensor and related techniques can identify passing conditions, failing conditions, and marginal conditions of a sensed object. The magnetic field sensor and techniques can use one or more peak values of a proximity signal representative of proximity of the object, DC offset values of the proximity signal, or threshold values related to an amplitude of a signal representative of the proximity signal to identify the conditions.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: Allegro Microsystems, Inc.
    Inventors: Daniel S. Dwyer, Christine Graham, P. Karl Scheller
  • Publication number: 20130335868
    Abstract: A power clamp circuit having improved robustness to electrostatic discharge (ESD) events includes a voltage regulation circuit and a current controlled switch. The voltage regulation circuit and the current controlled switch may be used to modify a snapback voltage of the power clamp in a manner that enhances the power clamp's ability to handle ESD events.
    Type: Application
    Filed: June 15, 2012
    Publication date: December 19, 2013
    Applicant: Allegro Microsystems, Inc.
    Inventors: Washington Lamar, Maxim Klebanov
  • Publication number: 20130335067
    Abstract: Magnetic field sensor and related techniques can identify passing conditions, failing conditions, and marginal conditions of a sensed object. The magnetic field sensor and techniques can use one or more peak values of a proximity signal representative of proximity of the object, DC offset values of the proximity signal, or threshold values related to an amplitude of a signal representative of the proximity signal to identify the conditions.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Daniel S. Dwyer, Christine Graham, Mark J. Donovan
  • Publication number: 20130335069
    Abstract: A magnetic field sensor can provide an output signal indicative of a passing condition or a failing condition of the magnetic field sensor. The output signal has one of a variety of output signal formats.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Ravi Vig, P. Karl Scheller, Devon Fernandez, Christine Graham, Paul David