What for the "D" in a PID control loop?

Started by George Herold in sci.electronics.basics8 years ago 13 replies
PID

I=92ve built several PID control loops, mostly for temperature control, but sometimes for other things. I=92ve always used the all three...

I=92ve built several PID control loops, mostly for temperature control, but sometimes for other things. I=92ve always used the all three PID parameters. I use to think that the D term was there to help reduce the ringing. (As stated in the wiki PID article.) And was needed to get critical damping of the loop. But this misunderstanding was corrected a few years ago by a colleague. F...


Scr firing

Started by Robotnik in sci.electronics.basics11 years ago 6 replies

Hello all, We have been trying to build a prototype of a single-phase power controller.The amount of power to be output is controlled by a...

Hello all, We have been trying to build a prototype of a single-phase power controller.The amount of power to be output is controlled by a PID algorithm. The PID algorithm resides in the external flash associated with a processor. The output from PWM module of the processor controls the firing of the SCR. Let me add that the input to the PID algorithm are the current temperature of the hea...


Meaning of Vce(sat)?

Started by Daniel Pitts in sci.electronics.basics4 years ago 18 replies
PID

I'm going to be using ULN2803APG in a design of mine, and I just noticed on the datasheet [1] that Vce(sat) typ is 1.3 at 350ma. Does that...

I'm going to be using ULN2803APG in a design of mine, and I just noticed on the datasheet [1] that Vce(sat) typ is 1.3 at 350ma. Does that mean that the voltage drop across the Vce will typically be 1.3 at that current? Or does that mean the voltage for Vbe needs to be that high to have saturation? [1]


PID tuning. Lag = ~ integrating time

Started by George Herold in sci.electronics.basics7 months ago 38 replies

Hi all, this is not so much a question, as me just spouting. If I do say (spout) something wrong, or that you disagree with or that you don't...

Hi all, this is not so much a question, as me just spouting. If I do say (spout) something wrong, or that you disagree with or that you don't understand, then please do speak up. I've been tuning loops for years. (By tuning I mean picking some reasonable starting values, all loops IME need a little real time tweaking from the starting values.) I've always used the Zeigler-Nichols...