SCR/Thyrisitor pnpn structure with 3 pn junctions.

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Presentation transcript:

SCR/Thyrisitor pnpn structure with 3 pn junctions

Cross-section of the pnpn structure 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 J1 J2 J3 + V AK - I A = 0

SCR/Thyristor (continued) + AK V AK- Increase the Anode-Cathode voltage until “breakdown” occurs. Anode current increases. “Conducting state” IAIA

Thyristor Volt-Ampere Characteristic

Two-Transistor Model

Effects of Increasing Gate Current

Line-Commutated Thyristor Circuit

Forced-Commutated Thyristor Circuit

Triac – Bi-directional Thyristor

Triac Volt-Ampere Characteristic