The　operating　principle　of　single-phase　double-voltage　Boost-APFC　(Boost　Active　Power　Factor　Correction)　converter　and　the　characteristics　of　traditional　single-cycle　control　algorithm　are　described.　As　the　traditional　single-cycle　control　algorithm　can　be　applied　only　in　the　continuous　inductive　current　mode,　an　improved　single-cycle　control　algorithm　is　proposed　based　on　the　operating　conditions　of　hybrid　inductive　current　modes,　which　applies　a　current　correction　coefficient　to　modify　the　sampling　current　for　correcting　the　error　of　inductive　current　sampling　in　the　discontinuous　inductive　current　mode.　The　steady-state　part　of　the　traditional　single-cycle　control　algorithm　is　improved　to　adapt　for　the　hybrid　inductance　current　modes,　which　achieves　a　whole-range　higher　power　factor　of　the　double-voltage　Boost-APFC　converter.　Results　of　the　simulation　based　on　PSIM　and　the　experiment　based　on　a　4.8　kW　prototype　show　the　validity　of　theoretical　analysis.　©,　2015,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.