Drive method for pulse inverter by driving six switches so that three=phase system is displaced w.r.t. virtual star point

摘要

The method involves using a bridge consisting of six semiconductor switches with antiparallel diodes. Six switches are driven so that a three-phase system exists at RST, displaced w.r.t. a virtual star point, and the respective phase in the block is driven intermittently at any operating point at fully controllable three-phase current. The voltage (U) may be formed at any time point from the difference between the value of the highest voltage in the three-phase system RST and the maximum producible voltage.