hi guys,

I am doing a fuzzy based mppt controller for PV array. now from different sources i have seen that the output membership function which is duty cycle is in a range of -4 to +4, now my question is that if we need a value of less than zero as duty cycle to get mppt, then how to use that negative voltage as duty cycle because duty cycle can have a value of (0 to 255) only.

with regards
hridz