This　paper　introduces　a　novel　single-switch　converter　that　incorporates　a　three-winding　coupled　inductor,　integrating　the　switched　capacitor　and　the　three-winding　coupled　inductor　(TWCI)　into　a　new　boost　unit　to　enhance　its　voltage　gain.　At　the　same　time,　a　passive　clamp　circuit　is　utilized　by　the　converter　to　reclaim　energy　from　the　leakage　inductor　and　alleviate　voltage　stress　on　power　switch　S.　Consequently,　a　power　switch　S　featuring　low　forward　voltage　and　reduced　on-resistance　may　be　chosen　to　minimize　switching　conduction　loss　in　the　converter.　In　addition,　the　proposed　converter　achieves　high　voltage　gain　under　low　turns　ratio　and　low　duty　cycle　conditions.　Furthermore,　it　utilizes　only　one　switch,　resulting　in　a　simple　control　scheme　for　the　circuit.　The　principle　of　operation　and　steady　state　analysis　of　the　proposed　converter　is　described　in　detail　and　the　design　principles　of　the　device　are　given.　The　relevant　performance　of　the　proposed　converter　is　verified　through　simulation　and　the　simulation　results　are　given.　©　2023　IEEE.