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Simple Realization of Integral Fuzzy Control for Isolated AHPFC Converters

Abstract This paper proposes an integral Takagi-Sugeno (T/S) fuzzy controller to achieve the output voltage regulation for an AC-DC isolated active high power factor correction (AHPFC) converter. The converter can avoid high voltage stresses and decrease harmonic distortions under discontinuous conduction mode (DCM). The dynamics of the converter are derived by the AM-TTS-DS method. To ensure zero steady-state error, we add an extra integral error signal to the dynamics. Translating coordinate to the DC operating points, the converter's stabilization model can be determined. Both feedback gains and system stability are inferred simultaneously. The control gains can be obtained by solving linear matrix inequalities (LMIs) via Matlab's toolbox. A surprising property is that the obtained feedback gains are identical for every fuzzy control rule. This condition greatly simplifies the realization using analog circuits. The simulations and experimental results exhibit the satisfactory performance of the converter with the designed integral T/S fuzzy regulator.