The maximum rms current of an SCR is 50 A. For a 120° sine wave conduction the form factor (FF) = 1.878 Find the average on-state current rating (ITAV).

To find the average on-state current rating (ITAV) for an SCR conducting for a 120° sine wave, we can use the relationship between the RMS current (IRMS), the average current (ITAV), and the form factor (FF) of the wave. The form factor is defined as:

[ text{FF} = frac{I_{RMS}}{I_{AVG}} ]

Where:

– ( I_{RMS} = 50 , A )

– ( text{FF} = 1.878 )

Rearranging the equation, we can find the average current:

[ I_{AVG} = frac{I_{RMS}}{text{FF}} ]

Substituting the values:

[ I_{AVG} = frac{50 , A}{1.878} ]

Calculating:

[ I_{AVG} approx 26.64 , A ]

Thus, the average on-state current rating ( I_{TAV} ) is approximately 26.64 A.