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An active front end replaces the diode rectifier of a drive with

  • A.a controlled converter capable of bidirectional power flow
  • B.a larger dc link capacitor of the same rating
  • C.a passive filter of inductors and capacitors
  • D.a transformer with multiple secondary windings

Answer: A

Switching devices in place of diodes let power flow either way, which gives regeneration, and also let the supply current be shaped to be nearly sinusoidal at unity power factor. Roughly doubling the front-end cost is what it takes.

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