transformer issue.

Discussion in 'General Electronics Chat' started by mohansaini, Apr 26, 2010.

  1. mohansaini

    Thread Starter New Member

    Apr 22, 2010
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    Hi
    I have to made an circuit using an 25-0-25V isolation transformer.the purpose for that is to sense the AC voltage from 200-300V,if i use series resistance then it require higher wattage and it becomes bulky.
    So what i have decided to use 2 scr & two windings at primary and an external voltage +12V Dc at anode of scr. it can be easy to understand from the schematic.
    The problem is that how it will work when there is no pulse at the gate of scr. View attachment Doc1.doc
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    What is the purpose of the 200 - 300 Volts sensing?

    [​IMG]


    Once the scr's are triggered they stay on because the powersupply is DC.
    They will only turn off when the power is removed.

    Bertus
     
  3. mohansaini

    Thread Starter New Member

    Apr 22, 2010
    13
    0
    The purpose behind is that i will convert this 25AC to 0-5 volt dc to which i can display by μc 89c51.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    2,348
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