The　power　supplies　usually　consists　of　two　stage　power　converters,　which　combining　the　power-factor-correction(PFC)　converter　circuit　with　DC-DC　post-regulator　converter　circuit　in　order　to　comply　with　various　worldwide　specifications　governing　the　harmonic　limits　of　the　line　current.　In　general,　the　Boost　converter　has　been　widely　used　as　a　PFC　circuit.　As　the　power　levels　are　increased,　however,　the　full-bridge　diode　rectifier　reduces　the　converter　efficiency　due　to　the　large　conduction　losses.　To　overcome　the　drawback　of　the　conventional　boost　converter,　the　bridgeless　boost　rectifier　has　been　investigated.　By　essentially　eliminating　the　full-bridge　diode　rectifier,　the　conduction　losses　are　reduced.　However,　circuit　actually　has　two　energy　conversion　stages　which　leads　to　higher　conduction　loss　in　the　circuit.　In　this　paper,　a　research　was　done　on　a　high　efficiency　single-stage　power　converter　is　proposed　for　power　supplies.　The　circuit　configuration　is　shown　in　section　I.　A　bridgeless　boost　rectifier　with　half-wave　rectification　with　high　power　factor　and　lower　conduction　losses　is　proposed　for　a　PFC　circuit.　Thus,　power　efficiency　is　increased　through　bridgeless　Boost　PFC　rectification　and　the　single-stage　operation　of　the　switching　devices.　The　analysis　of　the　proposed　converter　is　presented　and　the　design　considerations　for　220Vrms,　300　W　is　discussed.　Section　II　illustrates　the　various　modes　of　operation　for　the　proposed.　A　prototype　of　the　single-stage　topology　proposed　has　been　built　and　fully　tested.　The　observed　waveforms　of　input　voltage　and　input　current　to　the　proposed　converter　are　shown.　In　experiment,　A　high　power　efficiency　97%@220Vrms　and　a　power　factor　0.99@220Vrms　were　achievedr.　©　VDE　VERLAG　GMBH　·　Berlin　·　Offenbach.