Patents by Inventor Vijay Mangtani

Vijay Mangtani 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: 10291125
    Abstract: Methods and apparatus for a DC-DC converter having input voltage feedforward for reducing the effects of input voltage signal transients. In embodiments, a feedback circuit receives an output voltage and generates a feedback signal and a modulation circuit receives the feedback signal and generates a control signal for a switching element for generating the output voltage, which is boosted from an input voltage. A feedforward module combines a slope compensation signal, the input voltage, and current information for an inductive energy storage element, which forms a boost circuit for generating the output voltage and generates a ramp signal to the modulation circuit. A duty cycle of the control signal is proportional to an impedance compensation input, inversely proportional to the slope compensation and the input voltage, and inversely proportional to the inductor current.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: May 14, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Pranav Raval, Vijay Mangtani
  • Publication number: 20190020278
    Abstract: Methods and apparatus for a DC-DC converter having input voltage feedforward for reducing the effects of input voltage signal transients. In embodiments, a feedback circuit receives an output voltage and generates a feedback signal and a modulation circuit receives the feedback signal and generates a control signal for a switching element for generating the output voltage, which is boosted from an input voltage. A feedforward module combines a slope compensation signal, the input voltage, and current information for an inductive energy storage element, which forms a boost circuit for generating the output voltage and generates a ramp signal to the modulation circuit. A duty cycle of the control signal is proportional to an impedance compensation input, inversely proportional to the slope compensation and the input voltage, and inversely proportional to the inductor current.
    Type: Application
    Filed: September 18, 2018
    Publication date: January 17, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Pranav Raval, Vijay Mangtani
  • Patent number: 10110128
    Abstract: Methods and apparatus for a DC-DC converter having input voltage feedforward for reducing the effects of input voltage signal transients. In embodiments, a feedback circuit receives an output voltage and generates a feedback signal and a modulation circuit receives the feedback signal and generates a control signal for a switching element configured to generate the output voltage, which is boosted from an input voltage. A feedforward module combines the input voltage and current information for an inductive energy storage element, which forms a boost circuit for generating the output voltage, and provides a feedforward signal to the modulation circuit. The modulation circuit can generate the control signal from a ramp signal and the feedforward signal.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: October 23, 2018
    Assignee: Allegro MicroSystems, LLC
    Inventors: Pranav Raval, Vijay Mangtani
  • Publication number: 20180262107
    Abstract: Methods and apparatus for a DC-DC converter having input voltage feedforward for reducing the effects of input voltage signal transients. In embodiments, a feedback circuit receives an output voltage and generates a feedback signal and a modulation circuit receives the feedback signal and generates a control signal for a switching element configured to generate the output voltage, which is boosted from an input voltage. A feedforward module combines the input voltage and current information for an inductive energy storage element, which forms a boost circuit for generating the output voltage, and provides a feedforward signal to the modulation circuit. The modulation circuit can generate the control signal from a ramp signal and the feedforward signal.
    Type: Application
    Filed: March 8, 2017
    Publication date: September 13, 2018
    Applicant: Allegro MicroSystems, LLC
    Inventors: Pranav Raval, Vijay Mangtani
  • Patent number: 10069063
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: September 4, 2018
    Assignee: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 9859489
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: January 2, 2018
    Assignee: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 9781789
    Abstract: An LED driver for driving a plurality of series-coupled LEDs includes a bypass switch having first and second terminals coupled across a portion of the LEDs and a control terminal. A slew rate control circuit is responsive to a command input signal and to a feedback voltage associated with the bypass switch and is configured to generate a bypass switch control signal with a controllable slew rate. The slew rate control circuit is further configured to detect a rate of change of the switch feedback voltage and establish the bypass switch slew rate in response to the detected rate of change. Also described is method for controlling a bypass switch coupled across a portion of a plurality of series-coupled LEDs including detecting a rate of change of a voltage associated with the bypass switch and generating a control signal for the bypass switch in response to a command input signal and to the detected rate of change of the voltage.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: October 3, 2017
    Assignee: Allegro Microsystems, LLC
    Inventors: Nai-Chi Lee, Vijay Mangtani
  • Publication number: 20170110652
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Application
    Filed: December 30, 2016
    Publication date: April 20, 2017
    Applicant: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 9614428
    Abstract: A buck-boost switching regulator has an output voltage boost circuit to provide a boosted output voltage. The boosted voltage is used to generate higher voltage control signals to gates of NMOS switches, resulting in an ability to operate at lower input voltages.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: April 4, 2017
    Assignee: Allegro MicroSystems, LLC
    Inventors: Richard Garvey, Bassem Alnahas, Vijay Mangtani
  • Publication number: 20170054363
    Abstract: A system for regulating voltage includes a power supply input node configured to receive a power supply voltage. The system also includes a voltage reduction circuit having an input node coupled to the power supply input node and an output node. The voltage reduction circuit is configured to generate a voltage at the output node that is lower than a voltage at the input node. The system also includes a voltage multiplier circuit having an input node and an output node and configured to generate a voltage its output node that is higher than a voltage at the input node of the voltage multiplier circuit. In embodiments, the voltage multiplier circuit may be a charge pump and the voltage reduction circuit may be a buck converter.
    Type: Application
    Filed: August 21, 2015
    Publication date: February 23, 2017
    Applicant: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Vijay Mangtani, Gregory Szczeszynski
  • Patent number: 9538601
    Abstract: A driver circuit for driving one or more loads in a controlled manner includes multiple operational modes. In one mode, bypass switching may be used to adjust a drive signal applied to the one or more loads. In another mode, a DC-DC converter may be used to adjust the drive signal applied to the one or more loads. In at least one embodiment, the driver circuit is a light emitting diode driver circuit.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: January 3, 2017
    Assignee: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Vijay Mangtani, Nai-Chi Lee
  • Patent number: 9320094
    Abstract: Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: April 19, 2016
    Assignee: Allegro Microsystems, LLC
    Inventors: Gregory Szczeszynski, Bassem Alnahas, Vijay Mangtani
  • Patent number: 9265104
    Abstract: Circuits and methods used therein provide an adjustable average current through a load in accordance with a pulse width modulated (PWM) signal. A condition detection circuit is configured to identify a condition of the electronic circuit and to generate a condition signal indicative of the condition. A current extension circuit is coupled receive the condition signal and coupled to receive the PWM signal. The current extension circuit is configured to generate, at the output node of the current extension circuit, an extended PWM signal having a first state and a second state. The first state of the extended PWM signal longer in time than a first state of the PWM signal by an amount related to a value or a state of the condition signal. Current pulses through the load are extended to be longer in accordance with the extended PWM signal.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: February 16, 2016
    Assignee: Allegro Microsystems, LLC
    Inventors: Gregory Szczeszynski, Vijay Mangtani
  • Publication number: 20150303807
    Abstract: A buck-boost switching regulator has an output voltage boost circuit to provide a boosted output voltage. The boosted voltage is used to generate higher voltage control signals to gates of NMOS switches, resulting in an ability to operate at lower input voltages.
    Type: Application
    Filed: April 10, 2015
    Publication date: October 22, 2015
    Applicant: Allegro MicroSystems, LLC
    Inventors: Richard Garvey, Bassem Alnahas, Vijay Mangtani
  • Publication number: 20150243882
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Application
    Filed: May 8, 2015
    Publication date: August 27, 2015
    Applicant: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 9082957
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: July 14, 2015
    Assignee: Allegro Microsystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Publication number: 20150181671
    Abstract: Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes.
    Type: Application
    Filed: March 4, 2015
    Publication date: June 25, 2015
    Applicant: Allegro MicroSystems, LLC
    Inventors: Gregory Szczeszynski, Bassem Alnahas, Vijay Mangtani
  • Patent number: 9007000
    Abstract: Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: April 14, 2015
    Assignee: Allegro MicroSystems, LLC
    Inventors: Gregory Szczeszynski, Bassem Alnahas, Vijay Mangtani
  • Patent number: 8952471
    Abstract: An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. Another integrated circuit can have a first magnetic field sensing element and second different magnetic field sensing element disposed on surfaces thereof.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: February 10, 2015
    Assignee: Allegro Microsystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Publication number: 20140125236
    Abstract: Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes.
    Type: Application
    Filed: January 7, 2014
    Publication date: May 8, 2014
    Applicant: Allegro Microsystems, LLC
    Inventors: Gregory Szczeszynski, Bassem Alnahas, Vijay Mangtani