Question

During the transition time or turn-on time

(a) The forward anode voltage decreases from 90 % to 10 % & the anode current also decreases from 90  to 10 % of the initial value

(b) The forward anode voltage increases from 10 % to 90 % & the anode current also increases from 10 % to 90 % of the initial value

(c) The forward anode voltage decreases from 90 % to 10 % & the anode current increases from 10 % to 90 % of the initial value

(d) The forward anode voltage increases from 10 % to 90 % & the anode current decreases from 90% to 10% of the initial value

The question was posed to me at a job interview.

Query is from Thyristors-3 in chapter Power Electronics Devices of Power Electronics

Answer 1

The correct option is (c) The forward anode voltage decreases from 90 % to 10 % & the anode current increases from 10 % to 90 % of the initial value

For explanation: During the turn on time, the voltage across the SCR is going down and the current through it is slowly rising as it is going into the conduction mode.