basically -- all times you assume you have the constant output /!\ you are wrong /!\ <- there are more than one way such can manifest (by surprise) ,makes the mean value (The output mean value) almost constant
Monotonic, maybe? dare to ask.In the context of controllers UNSTABLE means specifically that the magnitude of the output increases WITHOUT BOUND..
Monotonically increasing is not stable either, since it qualifies as "without bound". The normal limit is a DC power supply. When your output hits the rails you have essentially lost control.Monotonic, maybe? dare to ask.
to go back to the original post,I have a DC output voltage that I generate from full bridge converter with a rectifier then sensed and sent to a processor to calculate its mean value.
The output mean value that I calculate, I would like to use a controller that makes the mean value almost constants or change in very slow mode.
I have tried to activate the I only, then I tried to deactivate both P And I to watch the reading of my value and It seems even when I have a constant output controller I have little variation(around 100mV) in the reading of my mean value.
I am reading about fuzzy controller and fuzzy PID controller if there are possibilities to make more stable
That is not really a very good reason for the choice. How about using multiple feedback loops to reduce the order of the system.I am choosing an Adaptive Fuzzy PID controller ,Because I have a hufe varying load
You are right , I have a mains AC that I can control ,then pass it through a transformer, then through a rectifier and then a capacitor that provides me a DC output with small oscillations, then I have a voltage divider that I pass the signal again through a DSP chip that calculate the mean value of my signal. it is this mean vale that I want to be constant at 99.95%.
Now, I opted for adaptive fuzzy PID controller but I am having difficulty in writing the membership function (triangular form) in C code,snce I am implementing it in Microcontroller
use some fuzzy digital technique it would be helpfulI have a DC output voltage that I generate from full bridge converter with a rectifier then sensed and sent to a processor to calculate its mean value.
The output mean value that I calculate, I would like to use a controller that makes the mean value almost constants or change in very slow mode.
I have tried to activate the I only, then I tried to deactivate both P And I to watch the reading of my value and It seems even when I have a constant output controller I have little variation(around 100mV) in the reading of my mean value.
I am reading about fuzzy controller and fuzzy PID controller if there are possibilities to make more stable