SCR phase control

Discussion in 'General Electronics Chat' started by damonj, Jan 28, 2010.

  1. damonj

    Thread Starter New Member

    Jan 28, 2010
    2
    0
    I've got an old welder that uses two SCRs for current control. I'm trying to re-engineer the electronics for the scr control, I was looking at the 555 timer for this but then I learned about the TCA785. Anybody have any experience with this? Are there other ICs out there that might be a better choice? The two SCRs control 15 volts each and are rated for up to 110 amps. I can't find a datasheet for the SCRs but my calculations show that gate current needs to be as low as 20 ma, but a little higher would probably be desireable. I can provide a drawing of what I have if need be.
     
  2. radiohead

    Active Member

    May 28, 2009
    474
    31
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