mexfi571
Newbie level 4
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Anyone can explain me how these circuits work? I need emergency informations.
Anyone can explain me how these circuits work? I need emergency informations.
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cancel said:you are sensing voltage at ZERO point. This is indication that at this moment you have 0 V at L.
In this moment you should change state of T1 and T2 by setting level at PIC_T1, T2
Sal said:FUSE S2, is emplyed to protect the circuit against overcurrents. what amazes me is the 1A value of that fuse, usually LED diodes such as D30 and the one in U20 uses around 200mA, I am not sure if they will blow at around 1A.
Pld4me said:Top circuit:
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Signal is applied to PIC_T1 which "turns on" the photo-triac gate. Photo-triac gate conducts and "turns on" the gate of T1 (or T2).
R48 and C17 "pass some of the current from L1 which is fed to the photo-triac and they also set a time constant for the "turn on" time of T1. T1 senses the zero crossing of the AC signal and conducts for the length of time determined by the time constant of R48 and C17.
Someone else correct me if I'm wrong. I am sometimes
Regards,
Pld4me