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firing circuit

Discussion in 'General Electronics Discussion' started by hasan081043, Nov 26, 2013.

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  1. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    i want to work with thyristor .please suggest some firing circuit for thyristor.
     
  2. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    hlw everyone
     
  3. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
  4. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Different thyristors will need different drive levels There are thyristors with sensitive gates such as the C106 and others which need more drive.

    For electric fencers needing one pulse per second, I have used :-
    1. Neon indicator bulb.
    2. Diac
    3. CMOS gate

    For phase angle control you will need a more complcated circuit.
     
  5. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    SCR firing circuit

    Actually i want to design a half wave controlled rectifier with thyristor.thyristor model-TYN612
    .Ac supply 220v ac 50Hz frequency
     
  6. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
  7. duke37

    duke37

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    769
    Jan 9, 2011
    TYN612 600V 12A gate 30mA 1.3V
     
  8. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    thanks jpanhalt and duke37
    But in those circuit firing circuit is not good .please prefar me some other circuit
     
  9. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    SCR firing circuit

    thanks jpanhalt and duke37
    But in those circuit firing circuit is not good .please prefar me some other circuit
     
  10. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
    @hasan
    I feel like we are blindfolded and trying to hit a moving target.
    1) What are your design specifications for the firing circuit?
    2) What specifically was "not good" with the suggested circuits already provided?

    You may find this excellent reference helpful: http://www.onsemi.com/pub_link/Collateral/HBD855-D.PDF

    John
     
  11. hasan081043

    hasan081043

    6
    0
    Nov 26, 2013
    SCR firing circuit

    The supply is 220v 50Hz ac.I need 60V DC output voltage .For this i need to fire the thyristor at 80

    degree.The main problem is to fire the thyristor at 80 degree .please sugest me the firing circuit.
    for half wave controlled rectifier
    Vdc=Vm(1+cost)/2*pi
    here t=firing angle
    Vm=maximum ac voltage
    Vdc=output DC voltage

    So for Vdc=60V ,Vm=1.414*220=311
    t=?
    the required firing angle would be 80 degree.
    so please help me how i can fire the scr at an angle 80 degree.
     

    Attached Files:

  12. Harald Kapp

    Harald Kapp Moderator Moderator

    10,350
    2,255
    Nov 17, 2011
    Use an RC combination to generate the required phase shift. Use a diac to create a defined trigger point. Read here for more.
     
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