An　integrated　buck-LC　converter　for　a　wide　voltage　range　is　proposed　in　thisarticle　based　on　a　quasi-two-stage　structure.　In　the　integrated　quasi-two-stage　buck-LC　(IQBLC)　converter,　the　LC　resonant　stage　is　under　dc　transformer　(DCX)　mode　and　the　buck　stage　can　achieve　voltage　regulation.　The　buck　stage　is　integrated　into　the　DCX　stage,　which　can　reduce　the　number　of　switches.　The　inductor　of　the　buck　stage　only　transfers　a　part　of　the　output　power,　which　benefits　efficiency　improvement　and　zero-voltage-switching　(ZVS)　achievement.　Different　working　modes　and　modulation　strategies　are　presented　for　the　IQBLC　converter　to　further　extend　the　voltage　gain.　The　soft　switching　of　all　switches　can　be　realized　under　different　modes　and　loads.　Besides,　a　duty　cycle　control　trajectory　is　proposed　to　realize　continuous　voltage　gain　adjustment　under　multimode　operation.　The　voltage　gain　characteristics,　partial　power　characteristics,　ZVS　conditions,　and　discontinuous　mode　constraints　of　the　LC　stage　are　analyzed　in　detail　in　this　article.　Experimental　results　are　obtained　from　a　1-kW　prototype　to　validate　the　effectiveness　of　the　proposed　converter.　©　1986-2012　IEEE.