I have two simple questions.
From what I know, if we want to use an opto-TRIAC (with another TRIAC of course) to control an AC motor, if we want to use it as an ON/OFF switch, then I have to go for a "zero crossing opto-TRIAC" right? From what I know, this kind of opto-TRIAC doesn't not trigger the TRIAC if the AC voltage is high and only triggers it when it is a light signal in the IR LED and there is a zero crossing, so for ON/OFF aplications of AC loads this kind of optocoupler is the best, right?
A "non zero crossing optotriac" triggers the triac independant of the level of AC voltage, right? If there is an IR LED ON this will trigger the opto-TRIAC (almost) at the same time and it does not care if there is an AC peak, right? If this is right, a non zero crossing opto-TRIAC would be perfect for a phase control application like a dimmer, right?
If what I said is correct, can you help me to understand this image?
I found it here.
The image for the zero crossing opto-TRIAC makes sense to me according what I said, but the image for the non-zero crossing opto-TRIAC doesn't make sense to me if we are talking about a resistive load. Is there an error in the graph of the voltage on the load?