need help understanding thyristors - triac problem

Thread Starter

justtrying

Joined Mar 9, 2011
439
I am completely lost with thyristors...


This is a problem from one of the worksheets on the site. I do not know how to do this. I tried to calculate the RC constant and converting it to angle, but I get:

RC=165k*0.068uF = 11.2 ms which is 242 deg


and I am pretty sure the approach is wrong anyway. I do not really now what to do. I know the diac conducts when breakdown voltage is reached and the triac is controlled from the gate. But the values are not specified and even if they were, I would still not now what to do.

Does anyone know any site that actually goes through solving some of these instead of simply describing principles of operation? Especially controlling phases?
 

Attachments

Thread Starter

justtrying

Joined Mar 9, 2011
439
i got it! it was simpler than i thought - just write an expression for Vc.

Question is still out on my SCR post (the one with no replies)
 
Top