Power Control Circuit Using Two SCRs - Power Control...

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Power Control Circuit Using Two SCRs Maxino, Lorraine Mae M. Paraiso, Joannacel A. Moralda, Jobert Quilin, Lovielyn
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SCR Potentiometer R controls the angle of conduction of the two  SCRs. The greater the resistance of the pot, lesser will be the  voltage across capacitors C 1   and C 2  and hence smaller will be  the time duration of conduction of SCR 1  and SCR 2  during a  cycle. During positive half cycle capacitor C 2  gets charged  through diode D 1 , pot R, and diode D 4 . When the capacitor gets  fully charged, (charge on the capacitor depending upon the  value of R) it discharges through Zener diode Z. This gives a  pulse to the primary and thereby secondary of the transformer  T 2 . Thus SCR 2 , which is forward biased, is turned on   and  conducts through load R L . During negative half cycle similar  action takes place due to charging of capacitor C
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