Greetings! High schooler here studying SCRs. I've been looking at sites and books on the concept of increasing an SCR's firing angle, and what I've noticed with these references is that they show you how to do it, but they never really explain why it was able to do that in the first place!
The circuit that is confusing me right now is this one:
My guess on how the firing angle increases: I actually calculated this circuit's firing angle and got 95 degrees!
So what I assume is that because a capacitor lags the current, it takes longer for the SCR (which needs a gate-triggering current) to activate. However! With an angle more than 90 degrees, doesn't that mean all the values of the source voltage have already been tried and not enough for the circuit to produce a gate-triggering current? What more with angles after 90 degrees, which have less voltage values since it passed its maximum?
I think there might be a concept of capacitors I am unfamiliar with? How can an SCR still exhibit a voltage waveform like this:
(Values of circuit if you're curious) R1 = R3 = Rload = 1kΩ, R2 = 500Ω, C = 10uF, Igt = 10mA, Vsource = 160 Vrms