GATE Electrical Engineering (EE) 2020 Solved Paper

A double pulse measurement for an inductively loaded circuit controlled by the IGBT switch is carried out to evaluate the reverse recovery characteristics of the diode, $\mathit{D}$, represented approximately as a piecewise linear plot of current vs time at diode turn-off. ${\mathit{L}}_{\mathrm{par}}$ , is a parasitic inductance due to the wiring of the circuit and is in series with the diode. The point on the plot (indicate your choice by entering $1,2,3$ or 4 ) at which the IGBT experiences the highest current stress is________________.