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The power factor and harmonic components of the utility input line current can be improved by shifting the input voltages" in the Delta/Star connected AC/DC converter as well as in the auto transformer phase-shifted AC/DC convert.
The output voltage of the-pulse AC/DC converter can be controlled by using the thyristors instead of diodes.
n the Delta/Star AC/DC converter with inductive load. A balanced current can be obtained when the thyristors are triggered with any firing angles.