The　bipolar　dc　microgrid　system　has　the　advantages　of　high　reliability,　high　flexibility,　and　high　efficiency.　By　introducing　coupled-inductor　and　switched-capacitor　step-up　units　on　Boost　bipolar　output　converter,　a　three-winding　coupled-inductor　high-voltage-gain　soft-switching　dc–dc　converter　with　bipolar　outputs　is　proposed　in　this　article.　The　proposed　converter　has　the　advantages　of　low　input　current　ripple,　high-voltage-gain,　and　low　voltage　stress　of　switches,　and　can　flexibly　adjust　bipolar　output　voltage　by　duty　ratio　of　the　main　switch　and　turns　ratio　of　the　coupled-inductor.　Meanwhile,　all　switches　achieve　zero　voltage　switching　(ZVS)　turn-ON　and　all　diodes　achieve　zero　current　switching　(ZCS)　turn-OFF,　which　creates　conditions　for　the　converter　to　operate　at　high　frequencies　and　efficiency.　Finally,　a　100　kHz　200　W　32　to　190　V　and　−190　V　experimental　prototype　is　built　to　validate　the　feasibility　of　the　proposed　converter.　The　efficiency　of　the　proposed　bipolar　output　converter　is　96.27%　at　the　rated　power.　©　1982-2012　IEEE.