Hi everyone,
I have a current control loop based on a PI controller, a PWM and a half-bridge to drive current through a phase of a BLDC. The current is measured via an OPAMP and ADC and fed back to the PI.
I know what is the precision of my actuator (PWM + Half-bridge), as well as my OPAMP and ADC, but I'm having troubles in understanding what will be the overall current precision at the end and how the PI coefficient may impact on this precision.
Not only I have to calculate the output precision, but eventually I should make sure that any single block of my control loop is correctly sized in order to achieve my target without the need to over specify any one in particular.
Any comment/suggestion is appreciated.
Al