Reduction of voltage stresses in buck-boost-type power factor correctors operating in boundary conduction mode

In this paper, a new converter is proposed for universal line PFC operated in boundary conduction mode. The proposed modified SEPIC enables the use of lower voltage rated semiconductors compared to other single-switch buck-boost derived topologies with a resulting performance comparable to the boost topology. The operation and the design procedure is described in detail and the proposed converter is experimental verified with a 210 V, 100 W prototype for the universal line input (90 Vac-270 Vac).