In　the　application　of　new　energy,　energy　storage,　and　emerging　power　loads,　the　power　supply　architecture　using　the　DC　bus　has　more　advantages　than　the　AC　bus,　which　is　the　development　direction　of　the　future　power　supply　system.　Bipolar　DC　microgrid　systems　are　often　used　to　connect　various　renewable　energy　sources　and　emerging　loads　due　to　their　higher　reliability,　flexibility,　and　efficiency.　This　paper　proposes　a　synthesis　method　for　non-isolated　bipolar　output　DC-DC　converters.　A　series　of　bipolar　output　DC-DC　converter　topologies　are　deduced.　In　order　to　further　improve　the　performance　of　bipolar　output　converter,　a　novel　high-voltage-gain　DC-DC　converter　with　a　three-winding　coupled-inductor　is　proposed　by　introducing　coupled-inductor　and　switched-capacitor　step-up　technology　to　Boost　bipolar　output　DC-DC　converter.　Based　on　the　characteristics　of　the　bipolar　output　converter,　the　topology　synthesis　principle　of　the　proposed　bipolar　output　DC-DC　converter　is　given.　The　input　ends　of　a　positive　output　DC-DC　converter　and　a　negative　output　DC-DC　converter　are　connected　in　parallel,　and　the　output　ends　are　in　series.　This　paper　gives　a　series　of　bipolar　output　DC-DC　converters　by　classifying　and　combining　traditional　DC-DC　converters.　However,　the　boost　capacity　of　these　converters　is　limited,　and　the　positive　and　negative　output　voltages　are　only　regulated　by　the　duty　cycle　of　the　switch.　Thus,　a　bipolar　high-voltage-gain　DC-DC　converter　with　a　three-winding　coupled-inductor　is　proposed.　The　bipolar　output　voltages　can　be　adjusted　flexibly　by　the　turns　ratio　of　the　coupled　inductor　and　the　duty　ratio.　This　paper　gives　the　construction　principle,　operating　mode,　voltage　gain,　and　stress　derivation　of　the　high-voltage-gain　bipolar　output　converter.　Compared　with　the　converters　in　the　literature,　the　proposed　converter　has　apparent　advantages　in　voltage　gain　and　device　voltage　stress.　An　experimental　prototype　with　a　rated　power　of　200　W　is　designed.　Experimental　results　show　that　the　input　current　ripple　is　small,　and　the　actual　voltage　gain　of　the　converter　is　380/32=11.875,　slightly　lower　than　the　calculated　(3+n1+n2)/(1−D)=12,　which　is　caused　by　parasitic　resistance　and　control　signal　delay.　The　efficiency　of　the　proposed　converter　is　95.5%　at　full　load　and　96.7%　at　half　load.　The　following　conclusions　can　be　drawn.　(1)　High　voltage　gain　can　be　achieved　with　low　input　current　ripple　and　small　switching　device　voltage　spikes.　(2)　Symmetrical　bipolar　output　voltage　can　be　achieved,　reducing　the　need　for　high　voltage　gain　of　power　supply　and　load.　(3)　The　converter　power　is　distributed　on　two　DC　bus　bars,　which　makes　the　system　more　efficient.　(4)　Part　of　the　diode　realizes　zero　voltage　switching　turn-off,　reduces　the　diode　reverse　recovery　loss,　and　improves　the　efficiency　of　the　proposed　bipolar　output　converter.　©　2025　China　Machine　Press.　All　rights　reserved.