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The mean output voltage of a three-phase fully controlled bridge is

  • A.\( (3V_{ml}/\pi)\sin\alpha \)
  • B.\( (6V_{ml}/\pi)\cos\alpha \)
  • C.\( (3V_{ml}/\pi)\cos\alpha \) for a line peak \( V_{ml} \)
  • D.\( (2V_{ml}/\pi)\cos\alpha \)

Answer: C

Six pulses per cycle give a higher mean and a much smaller ripple than a single-phase bridge, which is why three-phase supply is used for any drive of appreciable size. The cosine dependence on firing angle is the same.

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