I am using a H11L1 zero crossing detector for phase control of 250vac mains. This is very successful. I am using a random phase triac optocoupler.
What happens at zero voltage crossing is that no signal is applied to the emitter side of the opto. Then you apply your delaying signals to the opto for phase control. The triac is held off at zero crossing.
At zero crossing the triacs holding current falls so that it doesn't conduct. So my question is why you would need a zero crossing detector at all? You would think that the non conducting triac at zero crossing would be a suitable zero voltage crossing detector.
Why wouldn't that work?
What happens at zero voltage crossing is that no signal is applied to the emitter side of the opto. Then you apply your delaying signals to the opto for phase control. The triac is held off at zero crossing.
At zero crossing the triacs holding current falls so that it doesn't conduct. So my question is why you would need a zero crossing detector at all? You would think that the non conducting triac at zero crossing would be a suitable zero voltage crossing detector.
Why wouldn't that work?