Patents by Inventor Sandeep Chaman Dhar
Sandeep Chaman Dhar 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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Publication number: 20180151291Abstract: Some examples of the disclosure include a low profile inductor for use on a printed circuit board to minimize the area occupied and enable easier breakout routing and opening up additional area for other components. In one example, an inductor may include a cavity with diode, such as a low profile diode, that does not increase the area occupied by the inductor.Type: ApplicationFiled: September 18, 2017Publication date: May 31, 2018Inventors: Sandeep Chaman DHAR, Zhen Ning LOW
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Patent number: 9635724Abstract: A circuit may include a control loop to regulate an output of the circuit and a headroom sensing circuit to produce a headroom sensing signal indicative of a headroom voltage of the circuit. The control loop may have a response characteristic that is set based on the headroom signal received from the headroom sensing circuit.Type: GrantFiled: October 14, 2015Date of Patent: April 25, 2017Assignee: QUALCOMM IncorporatedInventors: Xinli Peng, Sandeep Chaman Dhar, Troy Stockstad
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Patent number: 9344022Abstract: The present disclosure includes circuits and methods for driving resonant actuators. In one embodiment, a drive signal is applied to an actuator during a portion of a plurality of half cycles of a period of the drive signal. The actuator has a resonant frequency and may vibrate in response to the drive signal. An induced voltage is generated on terminals of the actuator in response to the vibration. A detection circuit may detect when the induced voltage on the actuator crosses a threshold after the drive signal is turned off. The drive signal may be triggered based on when the induced voltage crosses the threshold to align a frequency and phase of the drive signal with the resonant frequency and a phase of the actuator.Type: GrantFiled: September 11, 2013Date of Patent: May 17, 2016Assignee: QUALCOMM IncorporatedInventors: Qadeer A Khan, Sandeep Chaman Dhar, Joshua A Zazzera, Todd R Sutton
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Patent number: 9285818Abstract: Techniques for autonomous thermal management of a power-management integrated circuit (PMIC). In an exemplary embodiment, an embedded microcontroller is provided on the PMIC to store instructions for implementing a thermal controller. The thermal controller may manage in real-time the current scaling factors of a plurality of modules coupled to corresponding off-chip power entities. The thermal controller may include registers that are programmable by an off-chip entity such as a microprocessor to specify parameters such as module priorities and a minimum current scaling factor for each module. Power entities that may be controlled by the autonomous thermal controller include, e.g., a battery charger, and/or one or more user-interface entities such as a back light display driver, a flash LED driver, or an audio amplifier.Type: GrantFiled: July 26, 2012Date of Patent: March 15, 2016Assignee: QUALCOMM IncorporatedInventors: Raymond Keith Rosik, Sandeep Chaman Dhar
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Publication number: 20160037603Abstract: A circuit may include a control loop to regulate an output of the circuit and a headroom sensing circuit to produce a headroom sensing signal indicative of a headroom voltage of the circuit. The control loop may have a response characteristic that is set based on the headroom signal received from the headroom sensing circuit.Type: ApplicationFiled: October 14, 2015Publication date: February 4, 2016Inventors: Xinli Peng, Sandeep Chaman Dhar, Troy Stockstad
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Patent number: 9219369Abstract: An electronic device is described. The electronic device includes a first port. The electronic device also includes a second port. The electronic device further includes a multiphase charger. The multiphase charger includes a first buck. The multiphase charger also includes a second buck. The multiphase charger further includes a first port switch. The multiphase charger also includes a second port switch. The multiphase charger further includes a reverse boost switch. The multiphase charger also includes a multiphase switch.Type: GrantFiled: March 15, 2013Date of Patent: December 22, 2015Assignee: QUALCOMM IncorporatedInventors: Narendra Singh Mehta, Chris M Rosolowski, Sandeep Chaman Dhar, Todd R Sutton
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Publication number: 20150349752Abstract: A circuit for driving a load may include a control loop having a response characteristic. A headroom signal indicative of the headroom voltage of the circuit may set one or more parameters of the response characteristic. A load sign indicative of electrical loading on the circuit may further set the response characteristic.Type: ApplicationFiled: June 2, 2014Publication date: December 3, 2015Applicant: QUALCOMM IncorporatedInventors: Xinli Peng, Sandeep Chaman Dhar, Troy Stockstad
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Patent number: 9197129Abstract: A method and apparatus for a boost converter topology for low battery voltage support. In the method, an input voltage is boosted by closing first through third switches and then opening a fourth switch to charge a capacitor. The first and second switches are then opened. The voltage is then doubled by closing the third and fourth switches to discharge the first capacitor into a second capacitor and charging a third capacitor. A further embodiment provides an additional method for selectively boosting an input voltage to an electronic device. The method first characterizes the efficiency of a circuit, and then determines a crossover point for a ratio of output voltage to input voltage, and then enabling or disabling a voltage boost converter based on the crossover point.Type: GrantFiled: January 28, 2013Date of Patent: November 24, 2015Assignee: QUALCOMM, IncorporatedInventors: Narendra S Mehta, Sandeep Chaman Dhar, Todd R Sutton
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Patent number: 9190986Abstract: A circuit for driving a load may include a control loop having a response characteristic. A headroom signal indicative of the headroom voltage of the circuit may set one or more parameters of the response characteristic. A load sign indicative of electrical loading on the circuit may further set the response characteristic.Type: GrantFiled: June 2, 2014Date of Patent: November 17, 2015Assignee: QUALCOMM IncorporatedInventors: Xinli Peng, Sandeep Chaman Dhar, Troy Stockstad
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Patent number: 9084326Abstract: A method and apparatus for optimizing a light emitting diode (LED) operation range is provided. The method comprises the steps of: turning on at least one LED; and then measuring an anode voltage of the at least one LED; then measuring a cathode voltage of the at least one LED. Once the measurements are completed, a forward voltage of the at least one LED is calculated. After the calculation, the at least one LED is turned off and a power multiplexer switch threshold is set for that LED based on the measured anode and cathode voltages.Type: GrantFiled: September 13, 2012Date of Patent: July 14, 2015Assignee: QUALCOMM IncorporatedInventors: Hua Guan, Sandeep Chaman Dhar, Chunlei Shi
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Publication number: 20150069939Abstract: The present disclosure includes circuits and methods for driving resonant actuators. In one embodiment, a drive signal is applied to an actuator during a portion of a plurality of half cycles of a period of the drive signal. The actuator has a resonant frequency and may vibrate in response to the drive signal. An induced voltage is generated on terminals of the actuator in response to the vibration. A detection circuit may detect when the induced voltage on the actuator crosses a threshold after the drive signal is turned off. The drive signal may be triggered based on when the induced voltage crosses the threshold to align a frequency and phase of the drive signal with the resonant frequency and a phase of the actuator.Type: ApplicationFiled: September 11, 2013Publication date: March 12, 2015Applicant: QUALCOMM IncorporatedInventors: Qadeer A. Khan, Sandeep Chaman Dhar, Joshua A. Zazzera, Todd R. Sutton
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Publication number: 20140266011Abstract: An electronic device is described. The electronic device includes a first port. The electronic device also includes a second port. The electronic device further includes a multiphase charger. The multiphase charger includes a first buck. The multiphase charger also includes a second buck. The multiphase charger further includes a first port switch. The multiphase charger also includes a second port switch. The multiphase charger further includes a reverse boost switch. The multiphase charger also includes a multiphase switch.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: QUALCOMM INCORPORATEDInventors: Narendra Singh Mehta, Chris M. Rosolowski, Sandeep Chaman Dhar, Todd R. Sutton
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Publication number: 20140070718Abstract: A method and apparatus for optimizing a light emitting diode (LED) operation range is provided. The method comprises the steps of: turning on at least one LED; and then measuring an anode voltage of the at least one LED; then measuring a cathode voltage of the at least one LED. Once the measurements are completed, a forward voltage of the at least one LED is calculated. After the calculation, the at least one LED is turned off and a power multiplier switch threshold is set for that LED based on the measured anode and cathode voltages.Type: ApplicationFiled: September 13, 2012Publication date: March 13, 2014Applicant: QUALCOMM INCORPORATEDInventors: Hua Guan, Sandeep Chaman Dhar, Chunlei Shi
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Publication number: 20140028377Abstract: Techniques for autonomous thermal management of a power-management integrated circuit (PMIC). In an exemplary embodiment, an embedded microcontroller is provided on the PMIC to store instructions for implementing a thermal controller. The thermal controller may manage in real-time the current scaling factors of a plurality of modules coupled to corresponding off-chip power entities. The thermal controller may include registers that are programmable by an off-chip entity such as a microprocessor to specify parameters such as module priorities and a minimum current scaling factor for each module. Power entities that may be controlled by the autonomous thermal controller include, e.g., a battery charger, and/or one or more user-interface entities such as a back light display driver, a flash LED driver, or an audio amplifier.Type: ApplicationFiled: July 26, 2012Publication date: January 30, 2014Applicant: QUALCOMM INCORPORATEDInventors: Raymond Keith Rosik, Sandeep Chaman Dhar
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Patent number: 7595686Abstract: A voltage controller (150), the controller comprising: a voltage comparator (700) operative to provide a digital error signal (152); a compensator (300) operative to determine a digital control signal (154) based on said provided error signal; and a modulator (400) operative to provide a power control signal (156) based on said determined digital control signal, wherein said comparator, said compensator, and said modulator are implemented entirely with digital logic gates.Type: GrantFiled: December 9, 2002Date of Patent: September 29, 2009Assignee: The Regents of the University of ColoradoInventors: Dragan Maksimovic, Benjamin James Patella, Aleksandar Prodic, Sandeep Chaman Dhar