Patents by Inventor Sooping Saw
Sooping Saw 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: 20240039385Abstract: A modulation device may include a variable burst regulator and a current-driven clock generator. The modulation device may include a first output terminal configured to provide a modulated voltage for an operating frequency over a modulation period. The current-driven clock generator may include a second input terminal configured to receive a buffered version of the modulated voltage. The current-driven clock generator may include a second output terminal configured to provide a modulated current during the modulation period. The operating frequency may be proportional to the modulated current. The operating frequency may control the operating frequency over the modulation period.Type: ApplicationFiled: July 29, 2022Publication date: February 1, 2024Inventors: Raul BLECIC, Giacomo CALABRESE, Sooping SAW, Premsagar KITTUR
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Patent number: 11774936Abstract: A method for electrically producing a stalled state in a stepper motor having a first coil and a second coil is provided. The method includes driving a first sinusoidal current through the first coil, and driving a second sinusoidal current through the second coil, wherein the first and second sinusoidal currents are in phase.Type: GrantFiled: September 24, 2020Date of Patent: October 3, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rakesh Raja, Sudhir Nagaraj, Sooping Saw
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Publication number: 20230006559Abstract: An integrated circuit (IC) assembly includes a first power stage adapted to receive an input voltage and a second power stage adapted to provide an isolated output voltage. The IC also includes a transformer coupled between the first and second power stages. The IC further includes a detuning circuit coupled to the transformer, and a receiver circuit coupled to the first power stage. The receiver circuit includes an integrator configured to integrate a switching signal within the first power stage.Type: ApplicationFiled: June 30, 2021Publication date: January 5, 2023Inventors: Nicola BERTONI, Giacomo CALABRESE, Stefano PANARO, Sooping SAW
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Publication number: 20220407425Abstract: A rectifier circuit includes a first diode-connected transistor coupled to a first voltage terminal and a second diode-connected transistor coupled to a second voltage terminal. A switch network is coupled between the first diode-connected transistor and the second diode-connected transistor. The switch network has a first switch network terminal adapted to be coupled to a first terminal of a secondary winding of a transformer and has a second switch network terminal adapted to be coupled to a second terminal of the secondary winding of the transformer.Type: ApplicationFiled: February 25, 2022Publication date: December 22, 2022Inventors: Giacomo CALABRESE, Nicola BERTONI, Sooping SAW, Taisuke KAZAMA
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Patent number: 11418137Abstract: A motor driver includes a low-side drive transistor, a comparator, a sense transistor, first switch, and a second switch. The low-side drive transistor is adapted to be coupled to a motor. The comparator is configured to determine a direction of a drive current flowing in the low-side drive transistor. The sense transistor is coupled to the low-side side drive transistor and is configured to pass a replica of the drive current. The first switch is configured to couple the sense transistor to the low-side drive transistor responsive to the drive current flowing in a first direction through the low-side drive transistor. The second switch is configured to couple the sense transistor to a ground responsive to the drive current flowing in a second direction, that is opposite the first direction, through the low-side drive transistor.Type: GrantFiled: April 20, 2021Date of Patent: August 16, 2022Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sayantan Gupta, Sooping Saw
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Patent number: 11218072Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.Type: GrantFiled: July 2, 2019Date of Patent: January 4, 2022Assignee: Texas Instruments IncorporatedInventors: Rajarshi Mukhopadhyay, Sooping Saw, Anuj Jain
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Patent number: 11101754Abstract: In one embodiment, a method includes detecting, by a stall detection sensor in a driver coupled to a stepper motor, a first set of time-off periods in a rising commutation phase of motor current during current regulation. The stall detection sensor further detects a second set of time-off periods in a falling commutation phase of motor current during current regulation. Next, the stall detection sensor compares the first set of time-off periods with the second set of time-off periods and determines whether the stepper motor is stalled based on the comparison of the first set of time-off periods with the second set of time-off periods.Type: GrantFiled: May 8, 2020Date of Patent: August 24, 2021Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sooping Saw, Rakesh Raja, Wen Pin Lin, Sudhir Nagaraj
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Publication number: 20210011451Abstract: A method for electrically producing a stalled state in a stepper motor having a first coil and a second coil is provided. The method includes driving a first sinusoidal current through the first coil, and driving a second sinusoidal current through the second coil, wherein the first and second sinusoidal currents are in phase.Type: ApplicationFiled: September 24, 2020Publication date: January 14, 2021Inventors: Rakesh Raja, Sudhir Nagaraj, Sooping Saw
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Patent number: 10824130Abstract: A method for electrically producing a stalled state in a stepper motor having a first coil and a second coil is provided. The method includes driving a first sinusoidal current through the first coil, and driving a second sinusoidal current through the second coil, wherein the first and second sinusoidal currents are in phase.Type: GrantFiled: January 31, 2019Date of Patent: November 3, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rakesh Raja, Sudhir Nagaraj, Sooping Saw
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Publication number: 20200266740Abstract: In one embodiment, a method includes detecting, by a stall detection sensor in a driver coupled to a stepper motor, a first set of time-off periods in a rising commutation phase of motor current during current regulation. The stall detection sensor further detects a second set of time-off periods in a falling commutation phase of motor current during current regulation. Next, the stall detection sensor compares the first set of time-off periods with the second set of time-off periods and determines whether the stepper motor is stalled based on the comparison of the first set of time-off periods with the second set of time-off periods.Type: ApplicationFiled: May 8, 2020Publication date: August 20, 2020Inventors: Sooping Saw, Rakesh Raja, Wen Pin Lin, Sudhir Nagaraj
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Publication number: 20200249648Abstract: A method for electrically producing a stalled state in a stepper motor having a first coil and a second coil is provided. The method includes driving a first sinusoidal current through the first coil, and driving a second sinusoidal current through the second coil, wherein the first and second sinusoidal currents are in phase.Type: ApplicationFiled: January 31, 2019Publication date: August 6, 2020Inventors: Rakesh Raja, Sudhir Nagaraj, Sooping Saw
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Patent number: 10686391Abstract: In one embodiment, a method includes detecting, by a stall detection sensor in a driver coupled to a stepper motor, a first set of time-off periods in a rising commutation phase of motor current during current regulation. The stall detection sensor further detects a second set of time-off periods in a falling commutation phase of motor current during current regulation. Next, the stall detection sensor compares the first set of time-off periods with the second set of time-off periods and determines whether the stepper motor is stalled based on the comparison of the first set of time-off periods with the second set of time-off periods.Type: GrantFiled: September 18, 2018Date of Patent: June 16, 2020Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sooping Saw, Rakesh Raja, Wen Pin Lin, Sudhir Nagaraj
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Publication number: 20190326902Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.Type: ApplicationFiled: July 2, 2019Publication date: October 24, 2019Inventors: Rajarshi MUKHOPADHYAY, Sooping SAW, Anuj JAIN
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Patent number: 10382032Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.Type: GrantFiled: September 25, 2017Date of Patent: August 13, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rajarshi Mukhopadhyay, Sooping Saw, Anuj Jain
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Publication number: 20190109551Abstract: In one embodiment, a method includes detecting, by a stall detection sensor in a driver coupled to a stepper motor, a first set of time-off periods in a rising commutation phase of motor current during current regulation. The stall detection sensor further detects a second set of time-off periods in a falling commutation phase of motor current during current regulation. Next, the stall detection sensor compares the first set of time-off periods with the second set of time-off periods and determines whether the stepper motor is stalled based on the comparison of the first set of time-off periods with the second set of time-off periods.Type: ApplicationFiled: September 18, 2018Publication date: April 11, 2019Inventors: Sooping Saw, Rakesh Raja, Wen Pin Lin, Sudhir Nagaraj
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Patent number: 10084402Abstract: A stepper motor control system includes stepper motor error reduction. For example, first and second power switches respectively energize and de-energize a stepper motor coil during each cycle for pulse-width modulating (PWM) the coil current. During a cycle including a zero crossing microstep, a calibrator detects a type of a body diode effect that occurs in the second power switch when the second switch stops de-energization of the coil. A selected offset is adjusted in response to the type of detection of the body diode effect of the second power switch. Adjusting the selected offset controls the trigger time for a comparator for comparing an offset reference voltage to a motor voltage developed in response to the coil current. Progressively adjusting the selected offset over successive cycles compensates for delays of components in the PWM control loop and reduces errors resulting from, for example, process, voltage, and temperature variations.Type: GrantFiled: October 17, 2016Date of Patent: September 25, 2018Assignee: Texas Instruments IncorporatedInventors: Sooping Saw, Anuj Jain, Jeffrey Okyere, Wen Chao Qu
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Publication number: 20180269869Abstract: Modulating a gate drive current supplied to an output drive switch coupled to an electric motor by performing at least the following: obtain a gate drive current modulation profile, supply, based on the gate drive current modulation profile, a first gate drive current level as the gate drive current when the output drive switch is operating within a first region, drop the first gate drive current level to a second gate drive current level when the output drive switch transitions from the first region to operating within a Miller region, increase the second gate drive current level to a third gate drive current level within the Miller region, and set the gate drive current to a fourth gate drive current level when the output drive switch transitions from the Miller region to operating within a third region.Type: ApplicationFiled: September 25, 2017Publication date: September 20, 2018Inventors: Rajarshi MUKHOPADHYAY, Sooping SAW, Anuj JAIN
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Patent number: 10063170Abstract: In a described example an apparatus includes: an FET driver circuit configured to supply current to a coil in a stepper motor, the FET driver circuit configured to regulate the current to the coil using a fixed delta current; a current chopper pulse width modulated circuit coupled to the FET driver circuit configured to supply pulses corresponding to a step control signal and a direction control signal; a back electromotive force (BEMF) monitor coupled to the current chopper circuit configured to measure an off time pulse and to output a BEMF monitor signal; and a controller coupled to the current chopper pulse width modulated circuit to supply the step and direction control signals and coupled to receive the BEMF monitor signal.Type: GrantFiled: June 9, 2017Date of Patent: August 28, 2018Assignee: Texas Instruments IncorporatedInventors: Sooping Saw, Rakesh Raja, Anuj Jain, Matthew Hein
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Publication number: 20180109213Abstract: A stepper motor control system includes stepper motor error reduction. For example, first and second power switches respectively energize and de-energize a stepper motor coil during each cycle for pulse-width modulating (PWM) the coil current. During a cycle including a zero crossing microstep, a calibrator detects a type of a body diode effect that occurs in the second power switch when the second switch stops de-energization of the coil. A selected offset is adjusted in response to the type of detection of the body diode effect of the second power switch. Adjusting the selected offset controls the trigger time for a comparator for comparing an offset reference voltage to a motor voltage developed in response to the coil current. Progressively adjusting the selected offset over successive cycles compensates for delays of components in the PWM control loop and reduces errors resulting from, for example, process, voltage, and temperature variations.Type: ApplicationFiled: October 17, 2016Publication date: April 19, 2018Inventors: Sooping Saw, Anuj Jain, Jeffrey Okyere, Wen Chao Qu
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Publication number: 20170366123Abstract: In a described example an apparatus includes: an FET driver circuit configured to supply current to a coil in a stepper motor, the FET driver circuit configured to regulate the current to the coil using a fixed delta current; a current chopper pulse width modulated circuit coupled to the FET driver circuit configured to supply pulses corresponding to a step control signal and a direction control signal; a back electromotive force (BEMF) monitor coupled to the current chopper circuit configured to measure an off time pulse and to output a BEMF monitor signal; and a controller coupled to the current chopper pulse width modulated circuit to supply the step and direction control signals and coupled to receive the BEMF monitor signal.Type: ApplicationFiled: June 9, 2017Publication date: December 21, 2017Inventors: Sooping Saw, Rakesh Raja, Anuj Jain, Matthew Hein