Lec_Presentation_SCR [P1].pdf - Thyristors Dr A S Nazmul Huda 1 Thyristors are classified as follows 1 Phase-controlled thyristors[or Silicon-controlled

Lec_Presentation_SCR [P1].pdf - Thyristors Dr A S Nazmul...

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Thyristors Dr. A. S. Nazmul Huda 1
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2 Thyristors are classified as follows: 1. Phase-controlled thyristors [or Silicon-controlled rectifiers (SCRs)] 2. Fast switching thyristors 3. Gate-turn off thyristors (GTOs) 4. Bidirectional triode thyristors (TRIACs) 5. Reverse-conduction thyristors (RCTs) 6. Static induction thyristors (SITHs) 7. Light-activated silicon-controlled rectifiers (LASCRs) 8. FET-controlled thyristors (FET-CTHs) 9. MOS-controlled Thyristors (MCTs) 10. MOS turn-off thyristors (MTOs) 11. Bidirectional phase-controlled thyristors (BCTs) 12. Emiter turn off (control) thyristors (ETOs) 13. Integrated gate-commutated thyristors (IGCTs)
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3 A thyristor is a solid state power semiconductor device. It has four alternating layer and three junctions J 1 , J 2 , J 3 of N type semiconductor and P type semiconductor material. A thyristor has three terminals. Namely anode, cathode and gate. Thyristor acts as a bistable switch, conducts when its anode is made positive with respect to cathode and gate signal (between gate terminal and cathode terminal) is applied. [ conducting when the gate receives a current trigger, and continuing to conduct until the voltage across the device is reversed biased, or until the voltage is removed (by some other means)]
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  • Summer '19
  • Semiconductor device, Dr. A. S. Nazmul Huda

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