![]() Fuses must be rated for the voltage AC or DC in which they will be used.It is the ratio of the ON time of the chopper to total time period of the chopper.ġ2.Can fuses with an AC voltage rating be used in a DC applications? SOA – Safe Operating Area determines the voltage and current boundary within which the Power Device can be operated without destructive failure.Ĩ.What are the main components used for isolating the Power Circuits, Power Semiconductor from the low-power circuit?ĩ.Name some of the current controlled (current driven) devices…ġ0.Name some of the voltage driven ( Voltage controlled) devices The angle between the zero crossing of the input voltage and the instant the SCR is fired is called as delay angle or firing angle. It reduces the turn ON time and enhances the di/dt capability. When gate current is several times higher than the required gate current, the SCR is said to be hard fired. It is a series combination of a resistor and a capacitor in parallel with the SCR.ĥ.What is hard switching of the thyristor? ![]() The snubber circuit is used for the dv/dt protection of the SCR. Herere the different Forward voltage triggering It is the minimum current required to latch(turn on) the SCR from forward blocking state to forward conduction state. When the forward current becomes less than holding current, SCR turns from forward conduction state to forward blocking state. It is the minimum current required to hold the SCR in forward conduction state. ![]()
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