quy1001
Junior Member level 2
I am designing a current converter, for step motor controller.
I use PWM converter with external MOSFETs.
I control current by adjusting dutycycle of switching pulses.
I feedback current by ADC, and comparing with Referent current (constant or sine shape).
The error is input of P (or PI) controller and output of current controller is dutycycle of switching pulses.
My design works correctly with P control, however, there are little noise exists.
I trying to apply PI control (or lag control) to remove that noise.
But the problem is, when the PI (or lag control) algorithm makes delay (too slow), and my control system does not work.
I think, my problem is the selection of Ki of PI controller (or pole and zero of lag controller) is not correct .
Could you suggest me any way to select Ki or Poles and zero correctly.
I use PWM converter with external MOSFETs.
I control current by adjusting dutycycle of switching pulses.
I feedback current by ADC, and comparing with Referent current (constant or sine shape).
The error is input of P (or PI) controller and output of current controller is dutycycle of switching pulses.
My design works correctly with P control, however, there are little noise exists.
I trying to apply PI control (or lag control) to remove that noise.
But the problem is, when the PI (or lag control) algorithm makes delay (too slow), and my control system does not work.
I think, my problem is the selection of Ki of PI controller (or pole and zero of lag controller) is not correct .
Could you suggest me any way to select Ki or Poles and zero correctly.
