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Power ElectronicsSCR Commutation

In a line-commutated AC rectifier, an SCR can turn OFF naturally when?

  • AIts current falls to zero and reverse voltage is available
  • BIts gate pulse is removed while current remains high
  • CIts gate is made more positive
  • DThe supply frequency becomes zero
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Correct Answer: A. Its current falls to zero and reverse voltage is available
Explanation: Natural commutation uses the AC source to bring current to zero and reverse-bias the outgoing SCR.
Reference: Standard power electronics: scr commutation
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