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: 8653756
    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 23, 2012
    Date of Patent: February 18, 2014
    Assignee: Allegro Microsystems, LLC
    Inventors: Gregory Szczeszynski, Bassem AINahas, Vijay Mangtani
  • Patent number: 8629520
    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 2, 2010
    Date of Patent: January 14, 2014
    Assignee: Allegro Microsystems, LLC
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 8610371
    Abstract: In one aspect, a circuit includes a plurality of comparators. Each comparator is configured to receive a first input from a corresponding load of a plurality of loads and to receive a second input as a regulation voltage. The circuit also includes an amplifier configured to receive signals provided by the plurality of comparators, a pulse-width modulation (PWM) circuit configured to receive a control signal from the amplifier and to provide a signal to a primary switch to control voltage provided to the loads and an output switch sequencer coupled to each of the comparators and configured to provide control signals to control switches coupled to the primary switch enabling one control switch to be active at a time. Each control switch provides a voltage increase to a respective load of the plurality of loads if enabled.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: December 17, 2013
    Assignee: Allegro Microsystems, LLC
    Inventors: Nai-Chi Lee, Gregory Szczeszynski, Vijay Mangtani
  • Publication number: 20130277782
    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: June 14, 2013
    Publication date: October 24, 2013
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Publication number: 20130277783
    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: June 14, 2013
    Publication date: October 24, 2013
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Publication number: 20130162152
    Abstract: In one aspect, a circuit includes a plurality of comparators. Each comparator is configured to receive a first input from a corresponding load of a plurality of loads and to receive a second input as a regulation voltage. The circuit also includes an amplifier configured to receive signals provided by the plurality of comparators, a pulse-width modulation (PWM) circuit configured to receive a control signal from the amplifier and to provide a signal to a primary switch to control voltage provided to the loads and an output switch sequencer coupled to each of the comparators and configured to provide control signals to control switches coupled to the primary switch enabling one control switch to be active at a time. Each control switch provides a voltage increase to a respective load of the plurality of loads if enabled.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 27, 2013
    Applicant: Allegro Microsystems, Inc.
    Inventors: Nai-Chi Lee, Gregory Szczeszynski, Vijay Mangtani
  • Publication number: 20130009556
    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: Application
    Filed: July 6, 2011
    Publication date: January 10, 2013
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Gregory Szczeszynski, Vijay Mangtani
  • Patent number: 8274238
    Abstract: An electronic circuit includes circuit portions for identifying a largest voltage drop through one of a plurality of series connected diode strings and for controlling a boost switching regulator according to the largest voltage drop. The electronic circuit can sense an open circuit series connected diode string, which would otherwise have the largest voltage drop, and can disconnect that open circuit series connected diode string from control of the boost switching regulator. Another electronic circuit includes a current limiting circuit coupled to or within a boost switching regulator and configured to operate with a diode load. Another electronic circuit includes a pulse width modulation circuit configured to dim a series connected string of light emitting diodes.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: September 25, 2012
    Assignee: Allegro Microsystems, Inc.
    Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
  • Publication number: 20120181939
    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 23, 2012
    Publication date: July 19, 2012
    Applicant: ALLEGRO MICROSYSTEMS, INC.
    Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
  • Patent number: 8169161
    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: November 10, 2008
    Date of Patent: May 1, 2012
    Assignee: Allegro Microsystems, Inc.
    Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
  • Patent number: 8080994
    Abstract: An integrated current sensor includes a current conductor, a magnetic field transducer, and an electromagnetic shield. The magnetic field transducer includes a sensor die. The electromagnetic shield is disposed proximate to the sensor die. The electromagnetic shield has at least one feature selected to reduce an eddy current in the electromagnetic shield.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: December 20, 2011
    Assignee: Allegro Microsystems, Inc.
    Inventors: William P. Taylor, Michael C. Doogue, John Cummings, Vijay Mangtani
  • Patent number: 7834603
    Abstract: An electronic circuit combines a synchronous switching regulator circuit with an overvoltage detection circuit. The overvoltage detection circuit is configured to generate an overvoltage signal capable of an overvoltage state indicative of a power supply voltage being above a predetermined threshold voltage. The switching regulator circuit is coupled to receive the overvoltage signal. The switching regulator is also configured, in response to the overvoltage signal being in the overvoltage state, to generate a first control signal resulting in at least one of two series coupled transistors being in an off condition.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: November 16, 2010
    Assignee: Allegro Microsystems, Inc.
    Inventors: Vijay Mangtani, Weiyun Chen, Ravi Vig
  • Publication number: 20100237450
    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: June 2, 2010
    Publication date: September 23, 2010
    Applicant: Allegro Microsystems, Inc.
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Patent number: 7787262
    Abstract: A capacitor charging circuit is provided with a primary side output voltage sensing circuit including an RC network having an RC time constant with a predetermined relationship to the RC time constant of the output capacitor. Once the capacitor voltage reaches a fully charged level, the charging mode is terminated. The output voltage is continuously detected by measuring the voltage across the primary side RC network that decays at a predetermined rate with respect to the output capacitor and the charging mode is commenced once the RC voltage falls to a predetermined level. According to a further aspect of the invention, a switch control circuit in a flyback converter controls the switch off time in response to detection of a change in the slope polarity of the voltage at a terminal of the switch.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: August 31, 2010
    Assignee: Allegro Microsystems, Inc.
    Inventors: Vijay Mangtani, Nai-Chi Lee, Tseng-Nan Tsai, John Humenick
  • Patent number: 7768083
    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: January 20, 2006
    Date of Patent: August 3, 2010
    Assignee: Allegro Microsystems, Inc.
    Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
  • Publication number: 20100072922
    Abstract: An electronic circuit includes circuit portions for identifying a largest voltage drop through one of a plurality of series connected diode strings and for controlling a boost switching regulator according to the largest voltage drop. The electronic circuit can sense an open circuit series connected diode string, which would otherwise have the largest voltage drop, and can disconnect that open circuit series connected diode string from control of the boost switching regulator. Another electronic circuit includes a current limiting circuit coupled to or within a boost switching regulator and configured to operate with a diode load. Another electronic circuit includes a pulse width modulation circuit configured to dim a series connected string of light emitting diodes.
    Type: Application
    Filed: December 2, 2009
    Publication date: March 25, 2010
    Applicant: Allegro Microsystems, Inc.
    Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
  • Patent number: 7675245
    Abstract: An electronic circuit includes circuit portions for identifying a largest voltage drop through one of a plurality of series connected diode strings and for controlling a boost switching regulator according to the largest voltage drop. The electronic circuit can sense an open circuit series connected diode string, which would otherwise have the largest voltage drop, and can disconnect that open circuit series connected diode string from control of the boost switching regulator. Another electronic circuit includes a current limiting circuit coupled to or within a boost switching regulator and configured to operate with a diode load. Another electronic circuit includes a pulse width modulation circuit configured to dim a series connected string of light emitting diodes.
    Type: Grant
    Filed: January 4, 2007
    Date of Patent: March 9, 2010
    Assignee: Allegro Microsystems, Inc.
    Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
  • Publication number: 20090289611
    Abstract: An electronic circuit combines a synchronous switching regulator circuit with an overvoltage detection circuit. The overvoltage detection circuit is configured to generate an overvoltage signal capable of an overvoltage state indicative of a power supply voltage being above a predetermined threshold voltage. The switching regulator circuit is coupled to receive the overvoltage signal. The switching regulator is also configured, in response to the overvoltage signal being in the overvoltage state, to generate a first control signal resulting in at least one of two series coupled transistors being in an off condition.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Inventors: Vijay Mangtani, Weiyun Chen, Ravi Vig
  • Publication number: 20090128045
    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: November 10, 2008
    Publication date: May 21, 2009
    Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
  • Publication number: 20090058412
    Abstract: An integrated current sensor includes a current conductor, a magnetic field transducer, and an electromagnetic shield. The magnetic field transducer includes a sensor die. The electromagnetic shield is disposed proximate to the sensor die.
    Type: Application
    Filed: October 30, 2008
    Publication date: March 5, 2009
    Inventors: William P. Taylor, Michael C. Doogue, John Cummings, Vijay Mangtani