The controllable silicon(thyristor) element equivalent circuit

Published:2011/6/24 7:40:00 Author:Seven | Keyword: controllable silicon, equivalent circuit | From:SeekIC

The controllable silicon(thyristor) is a 4-layer, 3-terminal element, which has 3 PN knot, when analysing its principle, we can regard it as an element composed of a PNP and a NPN, its equivalent chart is in figure 1. When the positive pole A is added with a forward voltage, BG1 and BG2 are both in amplifying state. At the moment, if we input a positive trigger signal from the control pole G, then BG2 will have a basic current ib2 in it, after the current is amplified by BG2, the collecting electrode current is ic2=β2ib2. As the collecting electrodes of BG2 and BG1 are connected directly, so ib1=ic2.



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