need help understanding thyristors - triac problem

Thread Starter

justtrying

Joined Mar 9, 2011
428
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?
 

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Thread Starter

justtrying

Joined Mar 9, 2011
428
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)
 
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