This　paper　presents　a　novel　step-up　inverter　with　wide　range　varied　input　DC　voltage,　and　the　associated　two　mode　control　strategy,　which　can　effectively　regulate　real　and　reactive　output　power.　The　circuit　topology,　control　strategy,　and　external　characteristic　are　deeply　analyzed.　The　circuit　topology　is　constituted　of　n　T　networks　and　full-bridge　inverter,　and　the　T　network　can　adopt　Buck-Boost　DC　converter　or　quasi-z　source　network　to　boost　the　input　voltage.　By　using　the　saturation　point　and　zero　point　as　the　control　mode　shifting　points,　the　two　modes　achieve　smooth　transition.　Experimental　results　from　a　500VA　96-200VDC/220V50Hz　AC　inverter　prototype　show　that　the　proposed　inverter　has　the　advantages　of　bidirectional　power　flow,　boost　capacity,　high　overall　conversion　efficiency　and　high　quality　of　output　waveform,　which　can　be　widely　used　in　the　step-up　inversion　with　wide　range　varied　input　DC　voltage.