A design method for PI-like fuzzy logic controllers for DC-DC converter

This paper proposes a novel design procedure of proportional and integral (PI)-like fuzzy logic controller (FLC) for dc--dc converters that integrates linear control techniques with fuzzy logic. The design procedure allows the small signal model of the converter and linear control design techniques to be used in the initial stages of FLC design. This simplifies the small signal design and the stability assessment of the FLC. By exploiting the fuzzy logic structure of the controller, heuristic knowledge is incorporated in the design, which results in a nonlinear controller with improved performance over linear PI controllers. Index Terms--Digital control, digital pulsewidth modulation (DPWM), dynamic response, fuzzy logic control (FLC), pulsewidth modulation (PWM), switching converter.