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Discussion

Compared with a diode front end, an active front end offers

  • A.the ability to run without any dc link capacitor
  • B.regeneration and much lower supply harmonics
  • C.a lower capital cost for the same drive rating
  • D.a simpler control scheme with no feedback required

Answer: B

Both benefits come from the same capability, since shaping the current and passing it either way are the same freedom. Where neither regeneration nor harmonic compliance is needed, the diode bridge remains the sensible choice.

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