Method for operating an inverter and inverter with a switch between a mid-point of a DC intermediate circuit and a connection for a neutral conductor of an AC network

摘要

For operating a transformerless inverter (1) having a polyphase inverter bridge (4) with a switch (35, 36) between a center (12) of an input DC link (4) and a terminal (32) for a neutral (33) of a polyphase AC network (3), when first operating conditions are present, electric power is fed to the inverter bridge (5) from the DC link (4) into the AC mains (3) when the switch 35, 36 is closed, whereas when there are second operating conditions different from Distinguish the first operating conditions, electrical power with open switch (35, 36) with the inverter bridge (5) from the DC voltage intermediate circuit (4) in the AC network (3) is fed.