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The maximum fundamental output of a sinusoidal PWM inverter, expressed as a fraction of what six-step operation gives, is about

  • A.78 per cent
  • B.100 per cent
  • C.50 per cent
  • D.127 per cent

Answer: A

Linear sinusoidal modulation can reach only \( \pi/4 \) of the six-step fundamental, which is why the last part of the voltage range is reached by over-modulating. Space vector modulation and third harmonic injection recover part of that shortfall.

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