GATE EE 2018 Set 1 — Question 14
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Power Electronics → Power Semiconductor Devices → MOSFET & IGBT Characteristics
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Question
Four power semiconductor devices are shown in the figure along with their relevant terminals. The device(s) that can carry dc current continuously in the direction shown when gated appropriately is (are)
Correct answer
(B) Triac and MOSFET
Solution
Thyristor and GTO are unidirectional devices that can only conduct current from Anode to Cathode. In the figure, the current is shown flowing from Cathode to Anode for both, so they cannot conduct. The Triac is a bidirectional device and can conduct in both directions. The MOSFET (specifically the power MOSFET shown) has an intrinsic body diode that allows current to flow from Source to Drain, and the channel can also be turned on to conduct in both directions. Thus, Triac and MOSFET can carry the current in the direction shown.
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