A　Y-source　coupled　inductor　based　high　voltage　gain　DC-DC　converter　with　zero　input　current　ripple　(ZICR)　is　proposed　in　this　paper.　ZICR　is　achieved　by　adding　an　auxiliary　circuit　which　is　composed　of　an　inductor,　a　capacitor,　and　a　coupled　inductor　in　series.　The　presence　of　the　capacitor　results　in　an　average　zero　current　passing　through　the　ZICR　structure.　Therefore,　a　small　size　magnetic　core　can　be　used　to　design　the　inductor,　which　can　reduce　the　volume　and　copper　loss　of　the　magnetic　components.　In　addition,　a　Y-source　coupled　inductor　along　with　a　voltage　multiplier　are　used　to　achieve　high　voltage.　The　inherent　passive　clamp　circuit　effectively　restricts　the　off-voltage　spike　and　voltage　stress　across　the　switch.　By　utilizing　capacitors　to　absorb　the　leakage　energy,　zero　current　switching　(ZCS)　turn-off　of　all　diodes　is　achieved　and　mitigates　the　reverse-recovery　issues　of　converter.　A　200　W　32-380　V　50　kHz　experimental　prototype　is　built　to　verify　the　feasibility　of　this　converter.　Within　the　output　power　range　of　40-200W,　the　efficiency　of　the　prototype　with　ZICR　structure　is　higher　than　that　without　this　structure.　The　maximum　efficiency　of　the　converter　with　the　ZICR　structure　and　without　it　are　95.9%　and　95.6%　respectively.　　©　2013　IEEE.