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SCR/Thyrisitor

SCR/Thyrisitor. pnpn structure with 3 pn junctions. Cross-section of the pnpn structure. + V AK -. J1. J2. J3. I A = 0.

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SCR/Thyrisitor

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  1. SCR/Thyrisitor pnpn structure with 3 pn junctions

  2. Cross-section of the pnpn structure + VAK - J1 J2 J3 IA = 0 Apply a forward bias voltage to the Anode-Cathode Junctions J1 and J3 are forward biased Junction J2 is reverse biased Only a small amount of current flows from A to K The device is in it’s OFF or “Forward Blocking” State

  3. SCR/Thyristor (continued) + VAK - IA Increase the Anode-Cathode voltage until “breakdown” occurs. Anode current increases. “Conducting state”

  4. Thyristor Volt-Ampere Characteristic

  5. Two-Transistor Model

  6. Effects of Increasing Gate Current

  7. Line-Commutated Thyristor Circuit

  8. Forced-Commutated Thyristor Circuit

  9. Triac – Bi-directional Thyristor

  10. Triac Volt-Ampere Characteristic

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