I am planning to set output of PI controller then use comparator and flip flop to feed MOSFET.
First of all, I have not much information especially about control diagram therefore I am kindly requesting your help. Questions are:
How much should I reduce to voltage to make PI controller circuit work properly I tried like 5V Vref?
For the output of the opamp what should I expect to see since I will compare this with shunt resistor current at the source of MOSFET ?
I created somehow transfer equations but can not calculate the proper capasitor and resistance so I tried it first without capasitor to experience opamp bit. I supplied almost 4.6V and Vref is 5V as far as I tried like that 5-4.6 = 0.4 V * 5 = 2V should be output of the op amp but I see at output 7V. Is there something I did wrong ?
I just simulate the output of the converter to play over it with following values.
Vref3 = 400VDC
Vref = 5V
Transfer function V(in) = 200V V(out) = 400V
V(s) / E(s) = Kp + Ki /s
Kp = Rf/Ri Ki = 1 /C*Ri