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A 220 1-ϕ, 220 Ω  resistor is connected in series with the gate of an SCR as shown in the given figure. The gate current required to fire the SCR is 7 mA. what is the input voltage (Vin) required to fire the SCR?

A 220 1-ϕ, 220 Ω  resistor is connected in series with the gate of an SCR as shown in the given figure. The gate current required to fire the SCR is 7 mA. what is the input voltage (Vin) required to fire the SCR? Correct Answer 2.24 V

Solution:

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Taking, Vg = 0.7 volt

Vin = Vg + IG × R

Vin = 0.7 + ( 7 × 10-3 × 220)

Vin = 0.7 + ( 1540 × 10-3  )

Vin = 0.7 + 1.54

Vin = 2.24 volt

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