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公开(公告)号：US11774936B2
公开(公告)日：2023-10-03
申请号：US17030683
申请日：2020-09-24
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakesh Raja , Sudhir Nagaraj , Sooping Saw
Abstract: 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.
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公开(公告)号：US11101754B2
公开(公告)日：2021-08-24
申请号：US16869617
申请日：2020-05-08
Applicant: Texas Instruments Incorporated
Inventor： Sooping Saw , Rakesh Raja , Wen Pin Lin , Sudhir Nagaraj
Abstract: 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.
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公开(公告)号：US20210083607A1
公开(公告)日：2021-03-18
申请号：US17101910
申请日：2020-11-23
Applicant: Texas Instruments Incorporated
Inventor： Michael Edwin Butenhoff , Rakesh Raja , Nicholas James Oborny
Abstract: Enhanced motor power control circuitry is presented herein. In one implementation, a circuit includes power transistor elements in a half-bridge arrangement configured to selectively switch current for a phase of a motor according to control signals applied to corresponding gate terminals. The circuit also includes control circuitry configured to produce the control signals to achieve target states among the power transistor elements. The control signals have ramp rates determined based at least on polarities of the current through the power transistor elements during inactive states.
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公开(公告)号：US20200212830A1
公开(公告)日：2020-07-02
申请号：US16236983
申请日：2018-12-31
Applicant: c/o Texas Instruments Incorporated
Inventor： Michael Edwin Butenhoff , Rakesh Raja , Nicholas James Oborny
Abstract: Enhanced motor power control circuitry is presented herein. In one implementation, a circuit includes power transistor elements in a half-bridge arrangement configured to selectively switch current for a phase of a motor according to control signals applied to corresponding gate terminals. The circuit also includes control circuitry configured to produce the control signals to achieve target states among the power transistor elements. The control signals have ramp rates determined based at least on polarities of the current through the power transistor elements during inactive states.
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公开(公告)号：US10824130B2
公开(公告)日：2020-11-03
申请号：US16263766
申请日：2019-01-31
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakesh Raja , Sudhir Nagaraj , Sooping Saw
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US20170366123A1
公开(公告)日：2017-12-21
申请号：US15619128
申请日：2017-06-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sooping Saw , Rakesh Raja , Anuj Jain , Matthew Hein
IPC: H02P8/14
CPC classification number: H02P8/14
Abstract: 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.
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公开(公告)号：US11573919B2
公开(公告)日：2023-02-07
申请号：US15985284
申请日：2018-05-21
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakesh Raja , Ishtiaque Amin , Kuang Yu Chiang , Ryan Kehr
Abstract: A method for synchronous serial communication includes encoding, by a master device, a header field to be initially transmitted in a frame with a header identification code and a slave count value that defines a number of slave devices communicatively coupled to the master device. A plurality of address fields to be transmitted in the frame are also encoded by the master device. Each of the address fields corresponding to a different one the slave devices. A first of the address fields to be transmitted in the frame corresponds to a last of the slave devices to receive the header field, and a last of the address fields to be transmitted in the frame corresponds to a first of the slave devices to receive the header field. The frame is transmitted to the slave devices by the master device.
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公开(公告)号：US10979045B2
公开(公告)日：2021-04-13
申请号：US16205576
申请日：2018-11-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Michael Edwin Butenhoff , Rakesh Raja , Anuj Jain
IPC: H03K17/687
Abstract: A transistor, e.g., field effect transistor FET, ringing adjustment circuit and method comprising the measuring of a voltage from a transistor (e.g., a node of a FET) during the transistor turning on and turning off, determining the voltage oscillation in the measured voltage by performing a derivative function on the measured voltage and detecting a switch in a voltage change rate from positive to negative or negative to positive, and comparing the voltage change rate after the detected switch to adjust drive current applied to the transistor to optimize efficiency while minimizing voltage oscillation and ringing.
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公开(公告)号：US20200249648A1
公开(公告)日：2020-08-06
申请号：US16263766
申请日：2019-01-31
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rakesh Raja , Sudhir Nagaraj , Sooping Saw
Abstract: 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.
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公开(公告)号：US10063170B2
公开(公告)日：2018-08-28
申请号：US15619128
申请日：2017-06-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Sooping Saw , Rakesh Raja , Anuj Jain , Matthew Hein
IPC: H02P8/14
Abstract: 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.
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