Pulse triggering is preferred higher than RC triggering because of its following advantages:
- The SCR has small turn ON time ie, upto 5uS. Hence a pulse of gate drive is sufficient to turn on the SCRs.
- Once the SCR turns ON, there is no need of gate drive. Hence gate drive in the form of pulses is suitable.
- The DC gate voltage and current increases losses in the SCR. Pulsed gate drive has reduced losses.
- The pulsed gate drive can be easily passed through isolation transformers to isolate SCR and the trigger circuit.