A　circuit　topology　of　differential　Buck-Boost　DC-DC　converter　mode　inverter　with　high　frequency　link　is　proposed.　The　inverter　consists　of　two　same　isolated　Buck-Boost　DC-DC　converters　with　differential　mode.　The　two　converters　output　two　low-frequency　sinusoidal　pulsating　DC　voltage　waveforms　with　180°　phase　difference.　And　it　adopts　the　instantaneous　value　feedback　complementally　control　strategy　of　output　voltage.　Four　modes　are　given　when　the　inverter　keeps　in　the　steady　state.　According　to　the　four　modes,　the　resistance,　inductive　and　capacitive　load　of　the　steady　principle　of　the　inverter　when　the　inverter　works　in　a　low　frequency　voltage　cycle　are　analyzed.　By　analyzing　the　switching　status　equivalent　circuit,　it　can　deduce　the　normalized　output　characteristic　curve　of　the　inverter　with　the　different　duty　cycles,　and　it　also　gives　the　parameters　of　the　key　circuit.　The　correctness　and　feasibility　of　the　inverter　and　control　strategies　are　verified　by　the　experimental　results.