Triggering TRIAC via DC

anso-engineer · 2025-02-06T08:43:23-0800

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 · 2025-02-06T09:52:04-0800

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 · 2025-02-06T09:57:15-0800

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.

Triggering TRIAC via DC

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Triggering TRIAC via DC

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