| 摘要 |
<p>Previously while stepped-waveform inverters approximate a sine wave to reduce the size of filters needed at the output of such inverters, efficient and effective methods of controlling such inverters have heretofore been lacking. In order to overcome these drawbacks of previous inverters, an inverter (24) for use in a power conversion system (10) of the type used in an aircraft, for example, is provided with a first subinverter pair (30) that generates a first pair of waveforms, a second subinverter pair (32) that generates a second pair of waveforms, and a third subinverter pair (34) that generates a third pair of waveforms. The three subinverter pairs (30, 32, 34) are connected to a summing transformer having first, second and third transformers (31, 33, 35). A regulator (50, 51) is coupled to the output of the summing transformer (31, 33, 35) and varies the phase angles between the three pairs of waveforms generated by the three subinverter pairs (30, 32, 34) based upon the voltage and current at the output of the summing transformer (31, 33, 35) in order to regulate the voltage at the output of the summing transformer (31, 33, 35).</p> |
