In　this　article,　a　high　step-up　hybrid　Y-source-quasi-Z　source　dc-dc　converter　is　obtained　by　combining　the　topology　of　Y-source　and　quasi-Z　source.　The　proposed　converter　inherits　all　the　advantages　of　Y-source　and　quasi-Z　source　converter,　namely　continuous　input　current,　common　ground　between　input　and　output　voltages,　built-in　step-down　transformer,　low　voltage　stress　of　switch,　and　low　output　diode　current　stress.　In　addition,　the　proposed　converter　has　high　voltage　gain　and　conversion　efficiency.　The　steady-state　analysis　and　voltage　and　current　stress　derivation　are　presented.　A　numerical　design　of　the　components　is　conducted.　The　loss　distribution　is　precisely　calculated.　The　conversion　efficiency　at　different　voltage　gains　was　also　investigated.　A　small　signal　model　is　composed.　Then　the　stability　of　the　system　is　studied　and　optimized　by　PID　compensator.　Finally,　a　160-W　prototype　made　in　the　laboratory　verified　the　effectiveness　of　the　proposed　converter,　and　the　efficiency　reached　95.201%　when　operating　at　rated　output　power.　The　proposed　converter　has　the　highest　experimental　efficiency　with　respect　to　the　other　compared　converters.　©　1982-2012　IEEE.