Phase-control

  
This circuit uses a PUT for phases control of an SCR. The relaxation oscillator formed by Q2 provides conduction control of Ql from 1 to 7.8 ms or 21.6° to 168.5°. This constitutes control of over 97% of the power available to the load.
Phase-control - schematic

Only one SCR is needed to provide phase control for both the positive and negative portion of the sine wave by putting the SCR across the bridge-composed of diodes Dl through D4.




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