Discussion
For an SCR with turn-on time of 5μs, an ideal trigger pulse should have :
Answer: C
The ideal pulse has a short rise time with pulse width = 6 μs.
The gate pulse must last longer than the SCR's turn-on time, so that the anode current has risen above the latching current before the gate drive is removed; otherwise the SCR turns off again when the pulse ends. With a turn-on time of 5 μs, a 6 μs pulse is long enough while a 3 μs pulse is not.
A short (fast) rise time makes turn-on quick and spreads conduction across the junction rapidly, reducing local heating and di/dt stress. A long rise time slows turn-on, so both 'long rise time' options are worse.
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