01․ Rise time is defined by the interval when
Rise time is known as the time interval when anode voltage drops from 90 % to 10 % of its initial value. At the same time anode current rise 10 % to 90 % of its final value.
02․ Spread time is defined as the interval during which
Voltage across SCR never comes down to zero. There is always a ON state voltage drop present across SCR.
03․ Maximum power loss occurs during
Only during rising time anode voltage and current simultaneously high. So power loss (V X I) is maximum here.
04․ The typical time of rising time lies between
Generally rise time is very low around 1 - 4 µs.
05․ During which time maximum conduction spreading take place in the thyristor during turn ON?
During spread time maximum charges spread across the thyristor.
06․ During reverse recovery time
During reverse recovery time free charge carriers swept out from the junction J1 and J3.
07․ During gate recovery time
Charges at J2 junction are trapped. So recombination is the only way to remove them.
08․ Typical range of thyristor turn OFF time is
Generally thyristor takes very short time to turn OFF in range 3 - 100 µs.
09․ Which statement is true ?
10․ ON state voltage drop across SCR lie between the range
ON-state voltage drop is very low around 1 - 1.5 V.