Design of a DSP-Based PD-like Fuzzy Controller for Buck DC–DC Converters

This paper develops the DSP-based (digital signal processor) proportional-derivative-like (PD-like) fuzzy mechanism for a buck DC–DC converters. The computation complexity is one drawback for the fuzzy controller to be realized in real-time systems. To reduce the computational complexity of fuzzy mechanisms for the real-time DSP implementation, the PD-like fuzzy controller is proposed in which the input of the fuzzy controller is designed to be the linear combination of state variables. The stability of the buck DC–DC converters with PD-like fuzzy controller is discussed. Compared to a PD controller, experimental results indicate that the PD-like fuzzy controller achieves fast transient response and is robust to variations.