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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 wavef

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 inverter having a plurality of subinverters that are operable in the generating mode to produce rectangular waveforms wherein the waveforms are summed by a summing transformer to produce a stepped AC output waveform. During operation in the starting mode, the output of a rectifier bridge and an input of one of the subinverters are connected together by an interphase transformer. DC power is developed at a mid-tap of the interphase transformer and is delivered to the remaining subinverters which in turn develop AC power for operating a brushless generator as a motor.

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A power conversion system utilizing a generator having armature windings and coupled to a prime mover wherein the power conversion system is operable in a generating mode to convert motive power developed by the prime mover into electrical power and in a starting mode to convert electrical power dev

A power conversion system utilizing a generator having armature windings and coupled to a prime mover wherein the power conversion system is operable in a generating mode to convert motive power developed by the 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, comprising: a rectifier having an input and an output; first and second inverters each having an input and an output and including a plurality of switches and a plurality of flyback rectifiers coupled across the switches; a transformer including first and second sets of primary windings and a set of secondary windings wherein the first set of primary windings is coupled to the output of the first inverter; an interphase transformer having first and second ends and a mid-tap; and means operable in the generating mode for coupling the rectifier input to the generator armature windings, the inputs of the first and second inverters to the rectifier output and the second set of primary windings to the second inverter output and operable in the starting mode for coupling the source of AC power to the set of secondary windings, the second set of primary windings to the input of the rectifier, the output of the rectifier to the first end of the interphase transformer, the input of the first inverter to the second end of the interphase transformer, the mid-tap of the interphase transformer to the input of the second inverter and the output of the second inverter to the generator armature windings; and means coupled to the inverters for operating same so that AC power produced by the generator in the generating mode is converted into DC power by the rectifier and the DC power is converted into fixed frequency AC power by the inverters which is developed in the set of secondary windings and so that AC power induced in the first and second sets of primary windings due to application of AC power to the set of secondary windings is converted into DC power by the flyback rectifiers of the first inverter, the rectifier and the interphase transformer and the DC power is converted into AC power at a controlled frequency by the second inverter which is applied to the generator armature windings.