Figure 1.a, shows the single-phase a.c. voltage controller with resistive load. As shown, two thyristors connected in antiparallel have been employed. Waveforms for source voltage $e_{s},$ gating pulses $i_{g_{1}}, i_{g_{2}},$ load-current $i_{o},$ load voltage $e_{0},$ voltage across $T_{1}$ as $V_{T_{1}},$ and voltage across $T_{2}$ as $V_{T_{2}}$ are shown in Fig.1.b. …