Figure 1 shows the basic power-circuit for current commutated chopper. Here, $T_{1}$ is the main thyristor. The commutation circuit consists of auxiliary thyristor $T_{2}$ , capacitor $C,$ inductor $L,$ diodes $D_{1}$ and $D_{2} . D_{F}$ is the freewheeling diode and R is the charging resistor. The main $\mathrm{SCR} T_{1}$ is …