bigdogguru
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Hi all i found a zero crossing optocoupler.
This is what in my mind and i want to ask you guys if it will work this way.
since we are using zero crossing optocoupler does it mean we dont need anymore to use a zero detection circuit?
Hi,
You need a separate zero-crossing point trigger input for the PIC, so the PIC can effectively control the TRIAC. Otherwise the PIC has no idea when the zero-crossing point occurs.
Unless you want to use the technique FvM suggested, unsynchronized PWM control.
FvM:
It uses a zero-crossing-detector triac. As I previously explained, you can use it with slow pwm control (e.g. 1 to 4 secs period) without synchronization to the AC voltage.
BigDog
---------- Post added at 16:02 ---------- Previous post was at 15:44 ----------
Here's a datasheet of a similar device:
OPTOCOUPLER TRIAC-OUT ZERO-CROSSING 6-DIP
The datasheet has some example applications towards the end of the document.