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Power ElectronicsFull Converters

For a single-phase fully controlled bridge with continuous current, increasing alpha beyond 90 degrees makes the average DC-side voltage?

  • ANegative
  • BAlways positive
  • CExactly zero for all alpha
  • DIndependent of alpha
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Correct Answer: A. Negative
Explanation: Since cos alpha becomes negative for 90°<alpha<180°, the converter's average DC voltage becomes negative; with suitable DC-side conditions this corresponds to inversion/regeneration.
Reference: Standard power electronics: full converters
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