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Raising the switching frequency of a PWM inverter

  • A.reduces both the current ripple and the switching loss of the inverter
  • B.increases the current ripple and reduces the switching loss
  • C.has no effect on either the ripple or the loss of the inverter
  • D.reduces the current ripple but increases switching loss

Answer: D

Higher frequency means smaller current excursions between switchings but more switchings to pay for. The choice is a compromise, influenced also by audible noise and by the stresses the fast edges place on the winding insulation.

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