Question

Two 1200 V thyristors are series connected and a supply of 2 kV is connected across them. The forward blocking characteristic of the first thyristor has a slope of 16.7 $\mu A/V$ and that of the second thyristor has a slope of 12.5 $\mu A/V$. If $V_{T1}and{V}_{T2}$ are the voltages across first and second thyristor respectively, then the value of $|V_{T1}-V_{T2}|$ is

Answer 1

$R_{T1}=\frac{1}{16.7\times {10}^{-6}}=60k\Omega$

$R_{T2}=\frac{1}{12.5\times {10}^{-6}}=80k\Omega$

$V_{T1}=V\times \frac{R_{T1}}{(R_{T1}+R_{T2})}=2\times \frac{60}{60+80}=857.14V$

$V_{T2}=V\times \frac{R_{T2}}{(R_{T1}+R_{T2})}=2\times \frac{80}{60+80}=1142.86V$

$|V_{T1}-V_{T2}|=|857.14-1142.86|$
= 285.72 V