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Hitachi Industrial Products, Ltd.Medium Voltage Multi-level IGBT Drives

Inverter Cell is composed of a diode converter and IGBT inverter.
Each Inverter Cell is fed from a separate secondary winding of the isolation transformer.
These Inverter Cells are connected in series and are operated in multiplexed mode. This mode of operation generates a stepped voltage output which approximates sine waveforms. This allows the direct inverter to be used not only with new inverter motors, but with existing standard motors as well.
In addition, the phase shifted multi-winding transformer effects reduction of current harmonics to the power supply well below the levels admitted under the IEEE 519-1992 guidelines.