Two buck choppers built-in single phase one stage pfc converter with reduced DC voltage ripple and its specific control scheme

This paper present an improved circuit topology for a buck chopper type single phase PFC-AC/DC converter with active power filtering function, which has smaller in reactor size and lighter in its weight, and can minimize the DC output voltage ripple factor. In addition, this active PFC-AC/DC converter can be also suppressed the current harmonics in utility AC grid without any specific feedback control scheme with current sensor interface. The circuit configuration treated here is more suitable for a variety of emergency power as well as telecommunication supply, where the lightning resistance is particularly considered to be more effective for 48 V-10 A output specification. In this paper, the operating principle of proposed AC-DC converter circuit using power MOSFETs and its related control implementation are described, along with its simulation and experimental results and their evaluations. The extended PFC-AC/DC converter topologies are demonstrated, which are operating at the proposed control scheme.