Fuzzy controlled single stage AC/DC converter with PFC to drive LEDs

Abstract

In this paper Fuzzy Controller bases AC/DC converter is presented to drive LEDs with high power factor. Because of having of advantages of Integrated converters like increased system reliability and reduced number of controlled switches in this paper IBFC(Integrated Buck-Flyback Converter) is considered as a driver circuit to drive LEDs. novel ac-dc IBFC converter combines input current shaping, isolation and better output regulation into a single stage. In this paper Integrated buck-fly-back converter (IBFC) is a single stage AC/DC converter, operating in discontinuous conduction mode (DCM) to achieve high Power factor with fast output voltage regulation. In this paper charge control technique and fuzzy logic control technique has been implemented which has some advantage like mathematical modeling is easy, flexible and fuzzy logic can model nonlinear functions etc., Comparative analysis of conventional PI based voltage controller to fuzzy based voltage controller for 90-230V input, 48V Output and 200W ac-dc converter operating at 100 kHz is presented and MATLAB/SIMULINK is used for implementation and simulation results show the performance improvement of proposed controller.