公开(公告)号：US20250007469A1

公开(公告)日：2025-01-02

申请号：US18344967

申请日：2023-06-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Ganapathi Shankar KRISHNAMURTHY

IPC: H03F1/52 ,  H03F3/45

Abstract: In an example, a circuit includes a transistor and a first amplifier having an output coupled to a control terminal of the transistor. The circuit includes a second amplifier having a second amplifier output coupled to the control terminal of the transistor. The circuit includes a resistor-capacitor network. The circuit also includes a first switch coupled to the first amplifier output, the transistor, and the resistor-capacitor network. The circuit includes a second switch coupled to the second amplifier output, the transistor, and the resistor-capacitor network, where the first switch is configured to couple the first amplifier output to the resistor-capacitor network, and the second switch is configured to couple the second amplifier output to the resistor-capacitor network.

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：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.