Engr.Irfan
Newbie level 4
Hey guys im working on a BTA41-800 triac . i just want to turn on my triac when 2nd zero-cross imean my load is a power transformer so i dont want my transformer turn on at peak value of AC 220V input. i just want my transformer turn on through Triac at zero-level crossing to reduce the inrush current.
Okey my problem is that im detecting the zero-crossing using op-amp and X-OR gate.
Case 1 : In start up my circuit will work fine when input (12VPP AC ) to op-amp starts from negative cycle to positive .
Case 2 : In start up if the (12VPP AC ) waveform starts from positive imean from peak at that time my circuit will not work fine. i will generate an extra high (+5v) signal at the output of x-OR gate which is what idont need.
my requirement is that i want to make a logic which can skip the first output pulse of X-OR and take the second pulse (2nd zero-crossing) as a final output.
Attacment likns given below
https://obrazki.elektroda.pl/3586395000_1512497886.jpg
https://obrazki.elektroda.pl/6252767500_1512498170.jpg
https://obrazki.elektroda.pl/4358625000_1512498366.jpg
Regards: Engr. Irfan
Okey my problem is that im detecting the zero-crossing using op-amp and X-OR gate.
Case 1 : In start up my circuit will work fine when input (12VPP AC ) to op-amp starts from negative cycle to positive .
Case 2 : In start up if the (12VPP AC ) waveform starts from positive imean from peak at that time my circuit will not work fine. i will generate an extra high (+5v) signal at the output of x-OR gate which is what idont need.
my requirement is that i want to make a logic which can skip the first output pulse of X-OR and take the second pulse (2nd zero-crossing) as a final output.
Attacment likns given below
https://obrazki.elektroda.pl/3586395000_1512497886.jpg
https://obrazki.elektroda.pl/6252767500_1512498170.jpg
https://obrazki.elektroda.pl/4358625000_1512498366.jpg
Regards: Engr. Irfan