Triggering TRIAC via DC

[anso-engineer]

Hello, I am trying to simulate TRIAC and see strange results. So here is my questions:
1. Why I got on R2 node current as sinusoidal during the whole simulation time?
2. Why I have those values?

 

[AnalogKid]

When energized, the optocoupler output is shorting the gate to MT1. This holds the TRIAC in the off state.

See page 3 of this datasheet for the correct connections:

https://www.digikey.com/htmldatasheets/production/234507/0/0/1/2n6071a-b-series.html

TRIAC app note - Yahoo Search Results

ak

 

[schmitt trigger]

Where is the DC supply for U2’s photo transistor side?
Don’t tell me it is V2. That supplies the LED side only.
The circuit as drawn will always be off.

 

[anso-engineer]

schmitt trigger ok, as I see there is not connection for the transistor base, It looks really strange.

But event if completelly remove triggering from the base it still continue to producing the current acroos R2.

 

[schmitt trigger]

Have you seen the scale? It is microamps.
Leakage currents.

 

[saul01]

Hello, I am trying to simulate TRIAC and see strange results. So here is my questions:
1. Why I got on R2 node current as sinusoidal during the whole simulation time?
2. Why I have those values? drive zone online vs carx street

View attachment 148800

Hello! It sounds like your TRIAC simulation might be conducting continuously or triggering unexpectedly. Could you check your gate trigger conditions and confirm the TRIAC’s holding current behavior in your setup?

 

[Tony Stewart]

Triacs leak from output capacitance and Early effects

 

[WestonTate]

Thank you so much for the info.