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The reverse recovery of a diode in an inverter leg causes

  • A.a permanent increase in the on-state voltage drop
  • B.a reduction in the dc link voltage during switching
  • C.a current spike and switching loss in the opposing switch
  • D.the switch to fail to turn on at all

Answer: C

Charge stored in the diode has to be swept out before it blocks, and that charge flows through the device turning on. Fast-recovery and silicon carbide diodes exist precisely to reduce that loss and the electrical noise it generates.

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