The PFC with Average Current-Mode and Voltage Fuzzy Controller for the Output Voltage

摘要

The paper presents a PFC (Power Factor Correction) that uses Average Current-Mode control. The PFC strategy uses PI controller to correct the input current shape and a fuzzy controller to control the output voltage. Since the performance of fuzzy logic controller only depends on the selection of membership function and the inference of fuzzy rules, fuzzy logic controllers have an advantage in coping with the time varying non-linearity of switches. On the other hand, PI controller design requires a accurate mathematical model of the plant and it failed to perform satisfactorily under parameter variation, non-linearity, load disturbance, etc…We build the model and simulate it in MATLAB. The simulation results show that the fuzzy controller for output voltage can achieve better dynamic response than its PI counterpart under lager load disturbance and plant uncertainties. The work offers a platform for digital PFC. This controller is proposed to be implemented in a FPGA with the digital PI-controller for current loop.