Help me make a cheap ZCD with 220V AC lines

[boseji]

Hello,

I wish to make a cheap ZCD for 220V AC Mains lines.
This is require for my isolated TRIAC firing.
I would require the output of this ZCD to be in 5V range and it should be able to detect both rising and Falling edges.
The PC817 Solution is elegant but requires 2 circuits to make a full detection. If there is some thing possible to do with a single output triggering at both the cycles.

Thanking you in Anticipation.

Regards,
Boseji

 

[boseji]

220v ac to 9v ac circuit

Hello,

I tried to simulate one circuit and found that it was optimal.
This used a 220v-to-9V AC transformer.


Please have a look. I have simulated this in LTspice where it gives good results.

Warm Regards,
Boseji

 

[TekUT]

isolated zcd circuit

As other way you can use a optoisolated ZCD driver like the MOC3042 (6-Pin DIP 400V Zero Crossing Triac Driver Output Optocoupler), datasheet link:

https://www.fairchildsemi.com/ds/MO/MOC3042-M.pdf

Cheers
F.F. a.k.a. Powermos

 

[boseji]

zcd detection

Hello,

You are right TekUT. But since I couldnt find any thing other than this opto so I used it.

Warm Regards,
boseji