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A neutral point clamped inverter uses clamping diodes to

  • A.provide the gate current the switching devices require
  • B.hold the intermediate level at the mid-point of the link
  • C.carry the load current while all the switches are off
  • D.limit the rate of rise of voltage across the switches

Answer: B

Connecting the output to the capacitive mid-point through those diodes gives the third level, so each device sees only half the link voltage. Balancing the two capacitor voltages is the control problem such a topology brings.

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