GATE EE 2014 Set 2 — Question 65
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Power Electronics → Power Semiconductor Devices → Thyristor V-I & Firing
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Question
The SCR in the circuit shown has a latching current of . A gate pulse of 50μs is applied to the SCR. The maximum value of in to ensure successful firing of the SCR is _________.
Correct answer
6055 to 6065
Solution
Given:
Latching current
Gate pulse width
Supply voltage The total current through the SCR () is the sum of the currents in the two parallel branches:
Branch 1 consists of a resistor and an inductor in series. The current is given by:
At the end of the gate pulse ():
Branch 2 consists of the resistor . The current is:
For successful firing, the total current at the end of the gate pulse must be at least equal to the latching current:
Thus, the maximum value of to ensure successful firing is approximately .
Latching current
Gate pulse width
Supply voltage The total current through the SCR () is the sum of the currents in the two parallel branches:
Branch 1 consists of a resistor and an inductor in series. The current is given by:
At the end of the gate pulse ():
Branch 2 consists of the resistor . The current is:
For successful firing, the total current at the end of the gate pulse must be at least equal to the latching current:
Thus, the maximum value of to ensure successful firing is approximately .
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