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Wednesday, October 2, 2013

An SCR carrying a current of 5 A, the increase in load demands the anode current to rise to 50 A in 2 micro seconds. di/dt rating of SCR is 20 A per microsecond and maximum current rating is 60 A.Comment ,under this condition what happens to SCR.

An SCR carrying a current of 5 A, the increase in load demands the anode current to rise to 50 A in 2 micro seconds. di/dt rating of SCR is 20 A per microsecond and maximum current rating is 60 A.Comment ,under this condition what happens to SCR.

Explanatory answer: 


given, di/dt rating of SCR = 20 A/ us

but actual di/dt = 50 A per 2 microseconds =50/2 = 25 A/ us

Thus the actual di/dt is greater than the di/dt rating of SCR. This will lead to damage of SCR.

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