This　paper　proposes　a　zero-input-current-ripple　(ZICR)　high-voltage-gain　dc-dc　converter　with　an　integrated　Y-source　network.　It　achieves　zero　input　current　ripple　by　introducing　a　parallel　branch　of　an　extra　inductor,　a　coupled　winding,　and　a　capacitor　at　the　input　port.　The　voltage　of　the　added　inductor　is　opposite　to　that　of　the　coupled　winding.　By　adding　the　Y-source　coupled　inductor,　the　boost　capability　of　the　converter　is　improved.　The　unique　boost　circuit　structure　makes　that　one　winding　in　the　three-winding　coupling　inductance　is　step-down　type　(the　turns　ratio　n(2)　＜　1)　while　the　other　winding　is　step-up　type　(the　turns　ratio　n(1)　＞　1).　In　such　a　case,　high　voltage　gain　can　be　obtained　under　a　lower　turn　ratio　of　the　coupled　inductor.　The　inherent　passive　clamping　circuit　clamps　the　spike　voltage　noises　of　the　main　switch　to　a　low　level　and　improves　the　efficiency.　All　the　diodes　have　achieved　ZCS　(zero　current　switching)　turn-off.　By　comparing　with　several　new　converters,　the　advantages　of　this　converter　are　proved.　Finally,　a　200-W,　48-　to　380-V,　50-kHz　experimental　prototype　is　built　based　on　the　theoretical　research.　At　the　rated　power,　the　measured　efficiencies　with　and　without　ZICR　are　95.2%　and　95.6%,　respectively.