Why is pulse triggering preferred over RC triggering?

Pulse triggering is preferred higher than RC triggering because of its following advantages:

  1. The SCR has small turn ON time ie, upto 5uS. Hence a pulse of gate drive is sufficient to turn on the SCRs.
  2. Once the SCR turns ON, there is no need of gate drive. Hence gate drive in the form of pulses is suitable.
  3. The DC gate voltage and current increases losses in the SCR. Pulsed gate drive has reduced losses.
  4. The pulsed gate drive can be easily passed through isolation transformers to isolate SCR and the trigger circuit.