INVESTIGATION OF BRIDGELESS PFC CONVERTER

Abstract

This Project brings forward the design and modeling of buck-boost common ground bridgeless power factor corrector worthy enough to use in application which requires to deriving a DC power from AC power. The introduction of common ground between input and output side of the AC-DC converter wipes out EMI issues along with the reduction of undesired output voltage ripples. It converts the grid ac voltage into a wide range of voltage output all happening in a single-stage circuit. Since it is in a bridgeless structure so it is simple in design. Detailed study about power factor correction followed by its different approaches has documented. Bridgeless topologies are gaining a lot of attention, therefore different types are discussed. High power factor, low THD, desired constant output voltage are also achieved. The proposed topology is closed loop controlled via hysteresis controller. The proposed buck boost topology is compared with the simulation of bridgeless boost PFC converter. The design and modeling of both converters is done on the MATLAB-simulation. Experimental results of modified buck-boost converter are presented for a 1.75 kW, operating from 220 Vrms input to 96 Vdc output. The modified buck-boost PFC result exhibits the potential for step-down ac to dc conversion with a significant efficiency respectively suitable to charge a 96V/15A EV battery.