Because　of　the　existence　of　many　power　devices,　complex　control　circuits,　low　efficiency,　high　cost　and　poor　reliability,　etc.　in　the　traditional　two-stage　LED　driver,　a　single-stage　bridgeless　Sepic　resonant　LED　driver　was　proposed,　which　is　integrated　by　multiplexing　the　switching　tube　of　the　single-switch　bridgeless　Sepic　circuit　and　the　lower　switching　tube　of　the　half-bridge　LLC　circuit.　The　operating　principle　and　the　operating　process　of　the　proposed　circuit　were　analyzed.　The　steady-state　characteristics　of　the　proposed　driver,　such　as　voltage　variable　ratio,　the　line　characteristics　and　soft-switching　characteristics　were　analyzed　in　detail;　then　the　proposed　circuit’s　key　parameters　were　designed　in　detail.　And　a　hybrid　APWM-PFM　control　strategy　was　designed　for　single-stage　circuits　with　a　wide　range　of　DC　bus　voltage　variations　caused　by　the　change　of　input　voltage.　Finally,　the　computer　simulation　was　carried　out　and　an　AC　input　185　-　265　Vrms,　rated　output　2　A　/　96　W　experimental　prototype　was　set　up.　The　efficiency　of　the　prototype　is　obtained　to　be　up　to　91.　5%,　the　maximum　value　of　PF　is　obtained　to　be　up　to　0.　995,　and　the　minimum　value　of　THD　is　obtained　to　be　down　to　5.　5%,　under　the　case　of　265　Vrms　AC　input,　the　bus　voltage　can　be　controlled　and　the　overall　variation　range　to　be　within　60　V　under　different　AC　input　voltages.　The　results　of　the　computer　simulation　and　the　experiment　have　been　obtained　to　verify　the　theoretical　expectations　and　the　validity　of　the　proposed　circuits　and　the　hybrid　control　strategy.　©　2024　Editorial　Department　of　Electric　Machines　and　Control.　All　rights　reserved.