公开(公告)号：US20230097035A1

公开(公告)日：2023-03-30

申请号：US17489269

申请日：2021-09-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Naresh KOTIKELAPUDI ,  Ganapathi Shankar KRISHNAMURTHY ,  Laxman SREEKUMAR ,  Siddhartha GOPAL KRISHNA

IPC: H02P8/12 ,  H02P8/34 ,  H02P7/03 ,  G01R19/165 ,  H03K5/24

Abstract: A method for controlling a stepper motor includes calculating a duty cycle of a current provided to the stepper motor and comparing a difference, between the calculated duty cycle and a base duty cycle of current provided to the stepper motor under a base load condition, to a reference duty cycle value. The method also includes adjusting a peak current level of the current provided to the stepper motor responsive to the comparison.

公开(公告)号：US20240380343A1

公开(公告)日：2024-11-14

申请号：US18496357

申请日：2023-10-27

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Vikram Dilip DANGE ,  Venkata Naresh KOTIKELAPUDI ,  Prasad KULKARNI

IPC: H02P7/00

Abstract: In some examples, an apparatus includes a filter having first and second inputs, a current signal input, and an output. The apparatus also includes a speed observer having a voltage signal input, a current signal input, and an output, the output of the speed observer coupled to the second input of the filter. The apparatus also includes a ripple counter having an input and an output, the input of the ripple counter coupled to the output of the filter. The apparatus also includes a ripple processor having first and second inputs, and an output, the first input of the ripple processor coupled to the output of the ripple counter, the second input of the ripple processor coupled to the output of the speed observer, and the output of the ripple processor coupled to the first input of the filter.

公开(公告)号：US20210050809A1

公开(公告)日：2021-02-18

申请号：US16747673

申请日：2020-01-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI

IPC: H02P8/22

Abstract: A stepper driver for a motor includes an H-bridge, a sense transistor coupled to the H-bridge, a voltage-to-current (VtoI) converter, and a sine digital-to-analog converter (DAC). The VtoI converter has a VtoI converter input and a VtoI converter output. The VtoI converter output is coupled to the sense transistor. The sine DAC has a sine DAC digital input, a reference input, and a sine DAC output. The sine DAC output is coupled to the VtoI converter input. The sine DAC includes an R-2R network, an offset control circuit coupled to the R-2R network, and a gain control circuit also coupled to the R-2R network.

公开(公告)号：US20230268855A1

公开(公告)日：2023-08-24

申请号：US17676610

申请日：2022-02-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Naresh KOTIKELAPUDI ,  Laxman SREEKUMAR ,  Anand YADAV

IPC: H02P8/38 ,  H02P8/12

CPC classification number: H02P8/38 ,  H02P8/12

Abstract: In accordance with at least one example of the description, a circuit is adapted to be coupled to a coil of a motor via an H-bridge circuit. The circuit includes a duty sensor, a subtractor, and a comparator. The duty sensor is coupled to the coil of the motor and is configured to provide raw run duty data responsive to a coil current through the coil. The subtractor is coupled to the duty sensor and is configured to provide a differential duty signal responsive to a stall duty signal and a run duty signal obtained using the raw run duty data. The comparator is coupled to the subtractor and is configured to provide a stall signal indicative of a stall condition for the motor responsive to the differential duty signal and a threshold value.

公开(公告)号：US20230067632A1

公开(公告)日：2023-03-02

申请号：US17463264

申请日：2021-08-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Venkata Naresh KOTIKELAPUDI ,  J DIVYASREE ,  Ganapathi Shankar KRISHNAMURTHY

IPC: H02P8/12 ,  H02P8/34

Abstract: A stepper motor controller includes a first error amplifier, a second error amplifier, and a comparator. The first error amplifier has a first input adapted to be coupled to a current sensor to receive a sensed drive current, a second input adapted to receive an expected drive current and an output to provide a first error signal based on a comparison of the sensed drive current and the expected drive current. The second error amplifier has a first input adapted to be coupled to a voltage sensor to receive a sensed drive voltage, a second input coupled to the output of the first error amplifier and an output to provide a second error signal based on a comparison of the sensed drive voltage and the first error signal. The comparator has a first input adapted to receive a reference signal, a second input coupled to the output of the second error amplifier and an output to provide a stepper motor control signal based on a comparison of the reference signal and the error signal.

公开(公告)号：US20210247462A1

公开(公告)日：2021-08-12

申请号：US16785793

申请日：2020-02-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ashish OJHA ,  Siddhartha GOPAL KRISHNA ,  Divyasree J ,  Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI

IPC: G01R31/52 ,  H03K17/687

Abstract: A circuit includes an input terminal, a first transistor, a second transistor, a comparator, a voltage reference circuit, and a control circuit. The first transistor includes a first terminal coupled to the input terminal. The second transistor includes a first terminal coupled to the input terminal. The comparator includes a first terminal coupled to the input terminal. The voltage reference circuit is coupled to a second terminal of the comparator. The control circuit includes an input, a first output, and a second output. The input is coupled to an output of the comparator. The first output is coupled to a second terminal of the first transistor. The second output is coupled to a second terminal of the second transistor.

公开(公告)号：US20210050808A1

公开(公告)日：2021-02-18

申请号：US16933583

申请日：2020-07-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Krishnamurthy SHANKAR ,  Venkata Naresh KOTIKELAPUDI ,  Siddhartha GOPAL KRISHNA

IPC: H02P8/12 ,  H02P8/22

Abstract: A stepper motor driver includes an H-bridge including first and second outputs. The H-bridge includes a low-side transistor coupled between the first output and a ground. A reference current circuit is configured to produce a reference current. The reference current circuit has a reference output. An averager circuit includes an input and output. The input of the averager circuit is coupled to the first output of the H-bridge. A comparator includes first and second comparator inputs. The first input of the comparator is coupled to the output of the average circuit and the second input of the comparator is coupled to the reference output.