An unintentional TRIAC triggering at start-up

[gunayburak]

Hi everyone ;

I've been working on a dimmer circuit in order to use / dim an incandescent lamp . I'm using the same exact Triac Driver circuit below .. And here is my problem ,

When I power up my circuit the lamp is triggered transiently , for a very short time ... (Like a flash effect) .. How can I prevent this happening to the lamp ?

This happens when I only power up the TRIAC side of the circuit .. So it doesn't have anything to do with PIC MCU ...

Any suggestions ?



http://i.stack.imgur.com/puXQb.png

[pedja089]

Try to add RC snubber to triac.
http://educypedia.karadimov.info/library/6785.pdf

[richard]

google snubber

[Archangel]

Set your "PORT" status to the intended state before you set the "TRIS" to output so it sets the output to a non fire state and then implements it.

[gunayburak]

the Snubber took care of it ... Thanks so much