Critical rate of rise of current - thyristor , Electrical Engineering

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Critical Rate of  Rise of Current

The maximum  rate of  increase of current  during  on state  which  the SCR  can tolerate is called  the critical rate of rise  of current  for  the device. This is specified at maximum  junction temperature. During  initial period  of turning on only  a small  area  near the  gate conducts the anode  current. If  the  current  increase too fast  localized overheating may take place. This  is called the  hole storage effect. Due to localized  heating the device may get permanently  damaged. To day devices are available which  can withstand rate o fries of current damaged. Up to 200- 250 a microsecond however in application  this rate  is hardly allowed to exceed beyond 5-10 a micro  second. Protection against  di/ dt  is provided  by series inductor.

 


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