In　order　to　achieve　low　switching　frequency　range　and　high　efficiency　for　a　wide-input　LLC　resonant　converter,　a　new　hybrid　control　combining　pulse-frequency　modulation　(PFM)　and　phase-shift　pulse-width　modulation　(PS-PWM)　is　proposed.　In　the　new　control,　the　LLC　converter　has　two　operation　modes,　i.e　PFM　and　PFM+PS-PWM.　The　new　control　scheme　and　operation　principle　is　analyzed　deeply,　and　then　efficiency　optimization　can　be　carried　out　by　the　proposed　design　procedure　for　the　resonant　tank　of　LLC　converter.　Finally,　a　prototype　is　developed　with　input　voltage　range　from　22V　to　45V,　and　rated　power　of　250W　and　output　voltage　of　380V.　The　experiment　shows　that　the　peak　efficiency　of　LLC　converter　reaches　to　96.2%,　and　verifies　the　proposed　control　scheme,　design.　©　2018　IEEE.