GATE EE 2026 Set 1 — Question 28
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Power Electronics → Power Semiconductor Devices → MOSFET & IGBT Characteristics
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Question
Consider the circuit shown in Figure (a). A gate pulse is applied between time instants and . After , during the MOSFET turn OFF process, it experiences a voltage overshoot.
Based on the waveforms shown in Figure (b), which one of the following options is correct?
Correct answer
(B) R₁ R₃ R₂
Solution
In the given circuit, when the MOSFET turns off, the inductor current freewheels through the diode and the snubber resistor . The voltage across the MOSFET during this period is given by . Neglecting the diode forward voltage drop, . At the instant of turn-off (), the inductor current is at its peak value. Therefore, the peak voltage overshoot is directly proportional to the resistance . From the waveforms in Figure (b), the peak voltage for is the highest, followed by , and then . This implies that .
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