A　Y-source　coupled　inductor-based　high　voltage　gain　dc-dc　converter　with　zero　input　current　ripple　(ZICR)　is　proposed　in　this　article.　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　is　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　the　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　40-200　W,　the　efficiency　of　the　prototype　with　the　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.