Turn-off control circuit

Published:2011/7/4 20:54:00 Author:Christina | Keyword: Turn-off, control circuit | From:SeekIC

The conduction and turn-off control circuit of the shut-off thyristor is as shown in the figure. When the conduction trigger signalis addedto the base of the semiconductor transistor VT, the VT conducts through the thyristor VS2 which is triggered by the capacitance C. At the same time, the power supply E charges the C through R1. When the turn-off positive pulse comes, the trigger transistor VS1 conducts, the capacitor C discharges through the R2, VS1, VS2(K-G). Because the voltage of the two ends of capacitor C can not change, so the circuit adds the negative pulse to the turn-off thyristor control electrode to turn off the VS2.



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