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.