Topic: Power Electronics
Which of the following power semiconductor devices is not a self-commutating device?
- A. Thyristor
- B. MOSFET
- C. IGBT
- D. GTO
Answer: A. Thyristor
Explanation: A self-commutating device can be turned ON and OFF entirely via its control terminal (gate). MOSFETs, IGBTs, and GTOs (Gate Turn-Off thyristors) fall into this category. A standard Thyristor (SCR) can be turned ON by a gate pulse, but it cannot be turned OFF by the gate; it requires external circuitry (forced commutation) or line voltage reversal (natural commutation) to bring its current below the holding current.