A　circuit　topology　with　a　Buck　mode　active　clamped　circuit　of　the　single-stage　bi-directional　flyback　mode　inverter　with　high　frequency　link　was　proposed　in　this　paper.　The　circuit　topology,　the　output　voltage　instantaneous　feedback　control　strategy,　steady　principle　characteristics,　and　the　design　criteria　for　the　key　circuit　parameters　were　fully　investigated　in　this　paper.　The　circuit　topology　is　composed　of　two　identical　bi-directional　flyback　DC-DC　converters　with　the　same　input　and　output　filters.　Two　converters　in　parallel　at　the　input-end　and　in　series　at　the　output-end　separately　generate　uni-polarity　sinusoidal　pulse　width　modulation　current　waveforms.　And　the　two　converters　output　positive　and　negative　half　cycle　uni-polarity　PWM　current　waveforms.　Using　the　proposed　circuit　topology,　successfully　designed　and　implemented　750　VA　48　VDC/220　V　50　HzAC　prototype　of　the　inverter　has　excellent　performances　such　as　the　simple　topology,　single　stage　power　conversion,　high　conversion　efficiency,　the　simple　control　scheme,　and　good　active　clamped　performances　etc.　©　2015　Chin.　Soc.　for　Elec.　Eng..