A power conversion system is operable in a generating mode to convert motive power developed by a prime mover into electrical power and in a starting mode to convert electrical power developed by a source of AC power into motive power for starting the prime mover. The system includes a stepped waveform...http://www.google.ca/patents/US4968926?utm_source=gb-gplus-sharePatent US4968926 - Power conversion system with stepped waveform DC to AC converter having prime mover start capability
