rc triggering circuit

Posted on Feb 7, 2014

Diagram shows an R-C-Diode circuit giving full half-cycle control (180 electrical degrees). On the positive half-cycle of SCR anode voltage the capacitor charges to the trigger point of the SCR in a time determined by the RC time constant and the rising anode voltage. The top plate of the capacitor charges to the peak of the negative voltage cycl

rc triggering circuit
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e through diode D2 on the negative half-cycle, resetting it for the next charging cycle. During negative half cycle capacitor charges in reverse direction when the supply voltage increases towards positive side the capacitor voltage also recharges in opposite direction. When this capacitor voltage reaches threshold voltage SCR will turn on and capacitor discharges through diode D2 and its voltage become very small positive voltage. Firing angle can be varied from 0 to 180 degree.

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