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).
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Patent number: 8653756Abstract: 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: GrantFiled: March 23, 2012Date of Patent: February 18, 2014Assignee: Allegro Microsystems, LLCInventors: Gregory Szczeszynski, Bassem AINahas, Vijay Mangtani
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Patent number: 8629520Abstract: 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: GrantFiled: June 2, 2010Date of Patent: January 14, 2014Assignee: Allegro Microsystems, LLCInventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
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Patent number: 8610371Abstract: 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: GrantFiled: December 22, 2011Date of Patent: December 17, 2013Assignee: Allegro Microsystems, LLCInventors: Nai-Chi Lee, Gregory Szczeszynski, Vijay Mangtani
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Publication number: 20130277782Abstract: 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: ApplicationFiled: June 14, 2013Publication date: October 24, 2013Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
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Publication number: 20130277783Abstract: 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: ApplicationFiled: June 14, 2013Publication date: October 24, 2013Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
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Publication number: 20130162152Abstract: 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: ApplicationFiled: December 22, 2011Publication date: June 27, 2013Applicant: Allegro Microsystems, Inc.Inventors: Nai-Chi Lee, Gregory Szczeszynski, Vijay Mangtani
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Publication number: 20130009556Abstract: 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: ApplicationFiled: July 6, 2011Publication date: January 10, 2013Applicant: ALLEGRO MICROSYSTEMS, INC.Inventors: Gregory Szczeszynski, Vijay Mangtani
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Patent number: 8274238Abstract: 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: GrantFiled: December 2, 2009Date of Patent: September 25, 2012Assignee: Allegro Microsystems, Inc.Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
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Publication number: 20120181939Abstract: 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: ApplicationFiled: March 23, 2012Publication date: July 19, 2012Applicant: ALLEGRO MICROSYSTEMS, INC.Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
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Patent number: 8169161Abstract: 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: GrantFiled: November 10, 2008Date of Patent: May 1, 2012Assignee: Allegro Microsystems, Inc.Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
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Patent number: 8080994Abstract: 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: GrantFiled: October 30, 2008Date of Patent: December 20, 2011Assignee: Allegro Microsystems, Inc.Inventors: William P. Taylor, Michael C. Doogue, John Cummings, Vijay Mangtani
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Patent number: 7834603Abstract: 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: GrantFiled: May 21, 2008Date of Patent: November 16, 2010Assignee: Allegro Microsystems, Inc.Inventors: Vijay Mangtani, Weiyun Chen, Ravi Vig
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Publication number: 20100237450Abstract: 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: ApplicationFiled: June 2, 2010Publication date: September 23, 2010Applicant: Allegro Microsystems, Inc.Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
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Patent number: 7787262Abstract: 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: GrantFiled: December 19, 2006Date of Patent: August 31, 2010Assignee: Allegro Microsystems, Inc.Inventors: Vijay Mangtani, Nai-Chi Lee, Tseng-Nan Tsai, John Humenick
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Patent number: 7768083Abstract: 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: GrantFiled: January 20, 2006Date of Patent: August 3, 2010Assignee: Allegro Microsystems, Inc.Inventors: Michael C. Doogue, William P. Taylor, Vijay Mangtani
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Publication number: 20100072922Abstract: 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: ApplicationFiled: December 2, 2009Publication date: March 25, 2010Applicant: Allegro Microsystems, Inc.Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
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Patent number: 7675245Abstract: 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: GrantFiled: January 4, 2007Date of Patent: March 9, 2010Assignee: Allegro Microsystems, Inc.Inventors: Gregory Szczeszynski, Shashank Wekhande, Vijay Mangtani
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Publication number: 20090289611Abstract: 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: ApplicationFiled: May 21, 2008Publication date: November 26, 2009Inventors: Vijay Mangtani, Weiyun Chen, Ravi Vig
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Publication number: 20090128045Abstract: 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: ApplicationFiled: November 10, 2008Publication date: May 21, 2009Inventors: Gregory Szczeszynski, Bassem AlNahas, Vijay Mangtani
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Publication number: 20090058412Abstract: 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: ApplicationFiled: October 30, 2008Publication date: March 5, 2009Inventors: William P. Taylor, Michael C. Doogue, John Cummings, Vijay Mangtani