Just an additional safety note. Please try and have any IC chip that has high energy going through it facing away from yourself. I had a DIP 8 switch mode controller IC explode on me when I had accidentally shorted some of it's pins with a solder splash and I was lucky that the board was upside down as a chunk of the chip exploded off when I applied power. Really glad that did not hit me in the face.
Yes, I failed to mention that I had put on some safety glasses because, even though I didn't really think there was a possibility of the thing actually exploding, I didn't wanna take any chances.
G is NOT neutral ! G = Gate An Optocoupler with Zero Crossing and Triac output doesn't need a neutral for detecting Zero crossing point. The Triac MT1 and MT2 are placed in series with the load. The optocoupler has a dedicated Zero Crossing detection circuit that is powered from MT1 and MT2, to properly operate, this circuit needs arround 15a20V to do his job, hence why a Zero Crossing isn't really switching at 0V of the sine wave, but a little above or below the Zero Crossing point. The G is the Gate of the Triac, in normal conditions this isn't connected, but a snubber capacitor/resistor can be placed between MT1 and the Gate to prevent false triggering in noisy environments. Some Optocouplers with Transistor or Mosfet on the output have a Gate or Base terminal on the output side for the same reason. Grtz
Just an additional safety note. Please try and have any IC chip that has high energy going through it facing away from yourself. I had a DIP 8 switch mode controller IC explode on me when I had accidentally shorted some of it's pins with a solder splash and I was lucky that the board was upside down as a chunk of the chip exploded off when I applied power. Really glad that did not hit me in the face.
Yes, I failed to mention that I had put on some safety glasses because, even though I didn't really think there was a possibility of the thing actually exploding, I didn't wanna take any chances.
G is neutral. Otherwise how would it be able to detect a zero crossing (which bu definition os the instance that the live crosses the neutral)
G is NOT neutral ! G = Gate
An Optocoupler with Zero Crossing and Triac output doesn't need a neutral for detecting Zero crossing point. The Triac MT1 and MT2 are placed in series with the load. The optocoupler has a dedicated Zero Crossing detection circuit that is powered from MT1 and MT2, to properly operate, this circuit needs arround 15a20V to do his job, hence why a Zero Crossing isn't really switching at 0V of the sine wave, but a little above or below the Zero Crossing point.
The G is the Gate of the Triac, in normal conditions this isn't connected, but a snubber capacitor/resistor can be placed between MT1 and the Gate to prevent false triggering in noisy environments. Some Optocouplers with Transistor or Mosfet on the output have a Gate or Base terminal on the output side for the same reason. Grtz
Look up the datasheet for the Toshiba TLP748J Optocoupler with Thyristor output, in the datasheet is the Gate terminal visible.
Nem tiveram o trabalho de colocar legenda , afinal falo portugues e nao ingles , nao sou gringo.