An inverter arrangement for generating a three-phase AC output voltage is provided with three pulse-controlled, free-running single-phase inverters. The inverters are connected at their inputs to a DC voltage source, and at their outputs to respective low-pass filters. The low-pass filters are connected...http://www.google.co.uk/patents/US4367522?utm_source=gb-gplus-sharePatent US4367522 - Three-phase inverter arrangement
