Aiming　at　the　problems　of　large　output　bus　capacitor　voltage,　low　power　factor　and　low　efficiency　in　existing　wide-range　input　single-stage　resonant　circuits,　a　single-stage　AC-DC　converter　based　on　bridgeless　Sepic　and　LLC　circuits　was　proposed.　And　the　hybrid　control　strategy　(APWM-PFM)　applied　to　the　single-stage　resonant　circuit　has　the　problems　of　slow　response　speed　and　poor　input　characteristics　of　the　converter　when　the　bus　voltage　was　stabilized.　A　sliding　mode　APWM-PFM　control　strategy　was　proposed　to　stabilize　the　output　current.　The　bus　voltage　was　stabilized　within　a　certain　range　and　maintains　good　input　characteristics.　The　working　principle　and　control　strategy　of　the　proposed　circuit　were　analyzed　in　detail.　Finally,　a　150　W　prototype　was　developed.　Simulation　and　experimental　results　show　that　the　proposed　converter　and　its　control　strategy　can　realize　the　soft　switching　of　all　switching　tubes　and　zero　current　shutdown　of　the　secondary　diodes,　which　has　well　performance;　The　power　factor　of　the　prototype　is　greater　than　0.99　and　the　total　harmonic　distortion　is　below　8%　under　rated　load　within　the　input　voltage　range　of　185　-　265　Vrms,　which　has　good　input　characteristics,　and　the　highest　efficiency　is　93.8%.　©　2022　Editorial　Department　of　Electric　Machines　and　Control.　All　rights　reserved.