A　high-efficiency　photovoltaic　(PV)　micro-inverter　consisting　of　two　power　stages　i.　e.　a　LLC　resonant　converter　with　a　new　hybrid　control　scheme　and　a　dc-ac　inverter　is　proposed,　studied　and　designed　in　this　paper.　In　the　first　power　stage,　the　new　hybrid　control　combining　pulse-frequency　modulation　(PFM)　and　phase-shift　pulse-width　modulation　(PS-PWM)　is　employed　on　a　full-bridge　LLC　dc-dc　converter,　in　order　to　achieve　high　efficiency　when　PV　output　voltage　varies　in　a　wide　range.　Moreover,　a　maximum　power　point　tracking　(MPPT)　method　based　on　power　perturbation　is　implemented　in　the　dc-ac　inverter.　Therefore,　the　complexity　of　regulating　LLC　converter　can　be　reduced　effectively,　and　efficiency　optimal　design　can　be　carried　out　through　the　proposed　designing　procedure　for　the　resonant　tank　of　LLC　converter.　Finally,　a　prototype　of　the　proposed　PV　micro-inverter　(PVMI)　is　developed　with　rated　power　of　250W　and　output　voltage　of　220VAC/50Hz.　The　experiment　shows　that　the　peak　efficiency　of　the　PVMI　is　95.5%,　where　efficiency　of　LLC　converter　is　up　to　97.7%,　and　the　MPPT　accuracy　is　more　than　99%.　Thus　the　validity　of　the　proposed　system　structure,　design　and　control　method　is　verified