A　circuit　configuration,　a　circuit　topological　family,　a　buck-mode　active　clamped　circuit,　and　an　instantaneous　output　voltage　feedback　control　strategy　of　combined　bidirectional　buck-boost　dc-dc　chopper-mode　inverter　with　high-frequency　(HF)　link　(HFL)　were　proposed　and　fully　investigated　in　this　paper.　The　steady　principle　characteristic　and　the　design　criteria　for　the　key　circuit　parameters　were　given　in　this　paper.　The　circuit　configuration　is　composed　of　two　identical　isolated　bidirectional　buck-boost　dc-dc　choppers　with　the　same　input　and　output　filters.　These　two　choppers　in　parallel　at　input　end　and　in　series　at　output　end　generate　unipolarity　sinusoidal　pulsewidth　modulation　current　waveforms　with　positive　and　negative　half　low-frequency　cycles　separately.　The　circuit　topological　family　includes　four　circuit　topologies,　such　as　one-transistor　mode.　Taking　the　one-transistor　mode　circuit　topology　as　an　example,　the　750VA48VDC/220V50HzAC　prototype　is　designed　and　implemented.　The　theoretical　analysis　and　principle　test　show　the　inverters　have　excellent　performance.　©　1982-2012　IEEE.