A　circuit　topology　of　differential　Forward　DC-DC　chopper　mode　inverter　with　high　frequency　link　was　proposed.　The　circuit　topology,　instantaneous　value　feedback　control　strategy　of　output　voltage　and　filtering　capacitance　current,　steady　principle　characteristic　and　design　criteria　of　the　key　circuit　parameters　were　fully　investigated　in　this　paper.　The　inverter　consists　of　two　same　bi-directional　forward　DC-DC　choppers　with　differential　mode.　The　two　choppers　with　the　same　input　and　output　filter　separately　output　positive　and　negative　half　cycle　uni-polarity　SPWM　voltage　waveforms.　The　theoretical　analysis　results　show　that　the　inverter　has　the　advantages　such　as　high　frequency　electrical　isolation,　simple　circuit　topology,　bi-directional　power　flow,　single-stage　power　conversion,　output　sinusoidal　voltage　waveform　with　low　THD,　strong　adaptability　to　various　loads　etc.　The　correctness　and　feasibility　of　the　inverter　are　fully　verified　by　the　principle　experimental　results.　©　2010　Chin.　Soc.　for　Elec.　Eng.