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ProductsPower Electronics TrainersSingle Phase Bridge Firing Circuit

Single Phase Bridge Firing Circuit


  • Line synchronized IC based linear firing circuit for SCR applications.
  • Line synchronization achieved by 230 / 9V step down transformer.
  • Four nos. firing pulses to trigger four SCRs.
  • 1:1:1 Pulse transformer used for gate pulse isolation.
  • One no. potentiometer used to vary the firing angle (180° - 0°).
  • All four pulses terminated on the front panel for external SCR device module interface.
  • Carrier logic circuit implemented for SCR self start, carrier frequency 4KHz.
  • Debounce logic circuit implemented for SCR gate pulse ON/OFF.
  • One no. toggle switch for gate pulse ON/OFF.
  • 230V, 5Hz AC input, fuse provided for over load protection.
  • One no. ON/OFF switch with LED indication for power ON/OFF.
  • Provision to control the firing angle through external 0 to 5V DC.