cupoftea
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Hi,
Regarding driving mains triacs to supply kilowatt loads,
Why don't they bother using an isolated flyback SMPS, with
its secondary ground to the Triac A2 terminal. Than a simple
transistor switch, operated via a digital isolator, could make triac gate
current flow. It would be exactly the right amount of gate current, instead
of these phase controlled opto-triac drives whereby the amount of triac
gate current depends on where you are in the mains cycle at the point
of triggering.
So why don't they do it like this?
Regarding driving mains triacs to supply kilowatt loads,
Why don't they bother using an isolated flyback SMPS, with
its secondary ground to the Triac A2 terminal. Than a simple
transistor switch, operated via a digital isolator, could make triac gate
current flow. It would be exactly the right amount of gate current, instead
of these phase controlled opto-triac drives whereby the amount of triac
gate current depends on where you are in the mains cycle at the point
of triggering.
So why don't they do it like this?