Triac zero voltage switching

  
The triac will be gated on at the start of the positive half cycle by current flow through the 3 µf capacitor as long as the C103 SCR is off. The load voltage then charges up the 1 µF capacitor so that the triac will again be energized during the subsequent negative half cycle of line voltage
Triac zero voltage switching - schematic

A selected gate triac is required because of the III+ triggering mode.




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