This　paper　proposes　the　circuit　structure,　topological　family　and　energy　management　control　strategy　(EMCS)　of　a　Buck　type　multi-input　distributed　generation　system　(DGS)　with　parallel-timesharing　power　supply.　Also,　the　power　supply　modes　(PSMs)　and　their　smooth　transition,　as　well　as　the　control　loops　and　multiple　duty　cycles　expression　are　studied.　The　circuit　structure　is　composed　of　a　Buck　type　single-stage　multi-input　inverter　and　a　single-stage　isolated　battery　charging/discharging　converter,　with　their　outputs　parallel-connected　on　the　AC　side.　The　topological　family　includes　full-bridge　etc.　3　types　of　circuit.　By　comparing　the　load　power　and　the　total　generated　multi-input　sources　power,　the　proposed　EMCS　achieves　real-time　control　of　charging/discharging　converter＇s　power　flow　and　the　system＇s　smooth　transition　among　different　PSMs.　The　proposed　＂variable　inductances　equivalent　method＂　regards　the　output　filter　inductor　as　the　parallel　connection　of　two　virtual　inductances,　based　on　which　the　small　signal　model　of　multi-input　inverter　is　established　and　the　corresponding　control　loops　are　designed.　Experimental　results　of　a　3kVA　laboratory　prototype　have　shown　that　the　proposed　circuit　topology　has　a　good　performance　of　high　conversion　efficiency,　low　distortion　of　output　voltage,　and　galvanic　isolation　among　load,　multi-input　sources　and　battery,　etc.