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IGBT diagram. If V GE ≥ 15V (i.e., gate-ON), the circuit between collector and emitter will be on (i.e., circuit-ON), V CE ≈ 0 and I C (≈ I E ) is large. But if V GE ≤ 0V (i.e., gate-OFF), the circuit will be off (i.e., circuit-OFF), I C ≈ 0 and I E ≈ 0. 

IGBT diagram. If V GE ≥ 15V (i.e., gate-ON), the circuit between collector and emitter will be on (i.e., circuit-ON), V CE ≈ 0 and I C (≈ I E ) is large. But if V GE ≤ 0V (i.e., gate-OFF), the circuit will be off (i.e., circuit-OFF), I C ≈ 0 and I E ≈ 0. 

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... shown in Fig.2, an IGBT is a terminal semiconduc- tor device for conducting current I c in one direction [26]. ...

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