help me with this,plz....

Discussion in 'General Electronics Chat' started by Iraways, Oct 25, 2009.

  1. Iraways

    Thread Starter New Member

    Nov 16, 2008
    3
    0
    [​IMG]

    i wanna design dis in multism,

    1.DONNO HOW TO ADJUST FIRING ANGLE OF SCR TO 45 DEGREE...PLZ
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    I don't know Multisim, but, if you think about it, the method is not too hard.

    Your line voltage runs at a constant frequency. That means that each positive AC excursion takes a fixed amount of time. You can detect when the line voltage crosses zero for a timing reference. So, having the zero crossing detected, use a timer function to wait for a 45 deg interval and fire the SCR.
     
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