Question

A voltage commutated chopper has the following parameters:
$V_s=200V$, load circuit parameters:$0.5\Omega ,2mH,40V$
Commutation circuit parameters:
$L=20\mu H,$ and $C=50\mu F$
$T_{on}=800\mu sec,T=2000\mu s$
When constant load current of 80 A flows through the load, then the peak current through main thyristor is__________A.

• A. 396.23

Answer 1

The correct option is A 396.23
Peak current through main thyristor,
$(I_{TM}{)}_{peak}=i_{load}+V_s\sqrt{\frac{C}{L}}$

$=80+200\sqrt{\frac{50\times {10}^{-6}}{20\times {10}^{-6}}}$

$=396.23A$