Fuzzy control logic for switching power supplies and device for performing it

摘要

A process for the fuzzy control of switching power supplies which have at least one inductor and at least one switching device, and a device for performing this control, the particularity whereof resides in the fact that it comprises the following steps: measuring the value of the current (IL) on the inductor (L); measuring the value of the input voltage (Vi) of the switching power supply; measuring an error (E) generated between a reference voltage (VREF) and an output voltage (Vo) of the power supply; defining fuzzy membership functions for the value of the current (IL) on the inductor (L), for the input voltage value (Vi), and for the error (E); defining an output membership function for the value of the duty cycle (DC) of the power supply; defining multiple fuzzy inference rules to which the measured values and the membership functions are applied; calculating the corresponding weight functions of the membership functions; defuzzifying the results obtained by means of the weight function calculation and the application of fuzzy rules so as to obtain a real value of the duty cycle (DC) which is suitable to drive the switching device (SW). $$