GATE 2024 Electrical Engineering Q35

Question

A forced commutated thyristorized step-down chopper is shown in the figure. Neglect the ON-state drop across the power devices. Assume that the capacitor is initially charged to 50 V with the polarity shown in the figure. The load current ($I_L$) can be assumed to be constant at 10 A. Initially, Th$_M$ is ON and Th$_A$ is OFF. The turn-off time available to Th$_M$ in microseconds, when Th$_A$ is triggered, is ________ (rounded off to the nearest integer).