Vipin said:
Hello,
Does anyone has circuits of PID controller implementation with OP-Amps or
Transistors.
Any sample configuration is OK.
Regards
Vipin
PI is very simple. you feed PV (process variable, or measured value)
or SP (setpoint) into the - input through a resistor, and the SP or PV
into the + input. The feedback from output to - input is a capacitor
in series with a resistor. This configuration produces both integral
and proportional effects on error (integral effect always takes place
on error, since its job is to bring average error to zero,
eventually). If you want to be able to move the setpoint, and have
only integral response take you to the new setpoint, you can't put
both effects in the same feedback path.
Adding derivative also involves some choices. Do you want the
derivative to act on error (setpoint and process changes) or just on
process change?
Then you start adding things like anti-windup prevention on the
integral, etc.