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???
12/06/11 17:33
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 		 #185025 - Triac Triggering
Responding to: ???'s previous message
Triacs can be triggered with current into the gate or out of it. They are known as "four quadrant devices". This means that in the circuit shown in the original posting that the triac can trigger with a pulse either above GND or below GND as long as the absolute value of the pulse amplitude exceeds the threshold level speced for the part. It is also important to remember that the pulse has to be applied with respect to the terminal typically labeled the A1 terminal. In your diagram the A1 terminal should be the one to GND.

http://en.wikipedia.org/wiki/TRIAC

Michael Karas


List of 40 messages in thread
TopicAuthorDate
Crowbar circuit using TL431            01/01/70 00:00      
   possibly worthless circuit            01/01/70 00:00      
      Speed not a problem            01/01/70 00:00      
         maybe it is            01/01/70 00:00      
      re: possibly worthless            01/01/70 00:00      
         no, the fuse blew            01/01/70 00:00      
            Polyfuse - OMG            01/01/70 00:00      
               And manufacturing tolerances can ruin the design...            01/01/70 00:00      
   Why not using...            01/01/70 00:00      
      Like shown here, e.g.,...            01/01/70 00:00      
         Possible but..            01/01/70 00:00      
            Tell us...            01/01/70 00:00      
   describe application, and needs            01/01/70 00:00      
      language            01/01/70 00:00      
         sorry            01/01/70 00:00      
            Awesome...            01/01/70 00:00      
         Antique...            01/01/70 00:00      
            The classic approach doesn't use a triac            01/01/70 00:00      
               did not think opf that.            01/01/70 00:00      
         Oh, come on, Erik ...            01/01/70 00:00      
            I do not critisize language problems...            01/01/70 00:00      
               It's a matter of personal pride ...            01/01/70 00:00      
      More info            01/01/70 00:00      
         and values of resistors?            01/01/70 00:00      
            Component values            01/01/70 00:00      
               oscillations?            01/01/70 00:00      
         one alternative circuit            01/01/70 00:00      
   a couple of questions ...            01/01/70 00:00      
   This one's straight from "often-wrong" Wikipedia            01/01/70 00:00      
   Thread wandering            01/01/70 00:00      
      then close it..            01/01/70 00:00      
         Problem now fixed            01/01/70 00:00      
            Are you sure??            01/01/70 00:00      
               Exactly the opposite            01/01/70 00:00      
                  Triac Triggering            01/01/70 00:00      
                     A1 to positive rail is ok            01/01/70 00:00      
                        Yes A1 to ++V            01/01/70 00:00      
                           Nevertheless...            01/01/70 00:00      
                              Not Necessarily            01/01/70 00:00      
                                 Standard for PC PSU            01/01/70 00:00      

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