Abstract
A knowledge of lateral gate current flow including the current drawn off into the shorting dot (SD) is crucial in assessing the stability of operation of thyristors. Following two recent papers the non-linear differential equation y″ + yy′ − Cy = 0 governing y( ζ), the normalised lateral gate current flow as a function of ζ, the normalised co-ordinate parallel to the cathode junction, is further investigated. Although analytical solutions have so far proved elusive, improved results have now been obtained for two terminal (2 T) operation with the use of second order approximations. The Non-Cauchy boundary conditions inherent in the problem have thus been bypassed. This has also assisted in the accurate numerical solution for three terminal (3 T) operation and a series of curves are presented. The influence of sheet resistance ( ϱ W ) clearly emerges, and the assumption previously made of approximately constant gate current is shown to hold only for low values of ( ϱ W ). The influence of gate current flow upon turn-on area is once more discussed, and the minimum gate current required to switch the device is derived.
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