US 11,949,364 B2
Peak current regulation for stepper motors
Venkata Naresh Kotikelapudi, Bangalore (IN); Ganapathi Shankar Krishnamurthy, Bangalore (IN); Laxman Sreekumar, Thrissur (IN); and Siddhartha Gopal Krishna, Bengaluru (IN)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Sep. 29, 2021, as Appl. No. 17/489,269.
Prior Publication US 2023/0097035 A1, Mar. 30, 2023
Int. Cl. H02P 8/38 (2006.01); G01R 19/165 (2006.01); H02P 7/03 (2016.01); H02P 8/12 (2006.01); H02P 8/34 (2006.01); H03K 5/24 (2006.01); H03K 3/0233 (2006.01)
CPC H02P 8/12 (2013.01) [G01R 19/16538 (2013.01); H02P 7/04 (2016.02); H02P 8/34 (2013.01); H03K 5/24 (2013.01); H03K 3/02337 (2013.01)] 20 Claims
OG exemplary drawing
 
8. A device adapted to be coupled to a stepper motor and operable to control the stepper motor, the device comprising:
a processing device having a first output adapted to be coupled to the stepper motor and a second output, the processing device configured to:
calculate a duty cycle of a current provided to a stepper motor; and
output, at the second output, a calculated duty cycle signal indicative of the calculation;
at least one register coupled to the processing device and configured to store a base duty cycle value of current provided to the stepper motor under a base load condition, and to store a reference duty cycle value;
a subtractor coupled to the processing device and to the at least one register, the subtractor configured to:
receive the calculated duty cycle signal; and
provide a subtractor signal responsive to a difference between the calculated duty cycle and the base duty cycle value; and
an error amplifier coupled to the subtractor and to the at least one register, the error amplifier configured to:
receive the subtractor signal;
compare the subtractor signal to the reference duty cycle value; and
provide an error signal responsive to the comparison;
wherein the processing device is further configured to adjust a peak current level of the current provided to the stepper motor responsive to the error signal.