Revista de Ingeniería
versão impressa ISSN 0121-4993
A complete design of a Takagi-Sugeno-Kang (TSK) fuzzy controller for a PWM boost DC-DC switching regulator operating at different steady-state voltages is presented. This controller performs a supervisory role through its region characteristic. On the one hand, the controller assigns different linear control laws according to the steady-state voltage value and limits their application to small-signal perturbations. On the other hand, the controller ensures a proper start-up to reach the desired steady-state voltage by means of properly saturating the PWM according to sliding-mode control principles. As a result, both an equalized small signal behavior and a controlled start-up are achieved for different steady-state voltages, thus extending the features of the regulator. Simulation and experimental results carried out on a current-controlled boost regulator operating at two different steady-state
Palavras-chave : DC-DC power conversion; fuzzy control; pulse width modulation; region supervision.