Multi-level Inverter Using 3-Phase Transformers and Common-Arm

摘要

The present invention relates to a multi-level inverter , and more particularly, by using a three-phase transformer output stage isolated uses a single direct-current power supply , and relates to a multilevel inverter using a common cancer ; the present invention is a plurality of low-frequency transformer which is series-connected to the output multi-level output ; A switch unit consisting of a DC power supply and connected in parallel to that for switching the bridge H. The low-frequency transformer; And a control unit for controlling the switch; include , and are three-phase transformer and the transformer , and the output terminal of the three-phase transformer is disclosed a multi-level inverter , characterized in that for each phase are connected in series in which each phase connection .