13 April 2017

Over voltage Protection of Semiconductor ( Why?)

  • When the SCR is in turned on condition, its maximum voltage rating must be less than the specific rating of the SCR. 
  • There are following main reasons for generation of over voltage or transient voltage.
                Commutation of the SCR
              Main switching, main supply, lightning surge voltage
              Inductive load
  • The rating of the SCR must be greater than the 2 to 2.5 times off state voltage in order to protect SCR against transient voltage. 
  • There are following circuits used in order to protect SCR. The overvoltage protection of semiconductor devices is achieved by
                   Snubber circuit
                   Non – linear resistor
                Crow bar circuit

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