thyristor

Discussion in 'Homework Help' started by amjad..ali, Apr 12, 2015.

  1. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    in this image if i removed the diode and Placed a thyristor
    how can i find the value of R , Vr , Ir and the better type of thyristor for this circuits if i know the input is AC 220 volt and 50 Hz and power on the R is 10 K watt


    image024.jpg
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Your Question is rather confusing !!
     
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  3. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    why ??
    i can explain it for you
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Ask clearly. Provide all the info you have.
    Partial questions might be ignored.
     
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  5. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    ok
    in the circuits diode be replaced by thyristor ok
    all information is:
    input voltage 220 and 60 Hz
    power on the load 10 k watt

    i need to calculation the value of Resistance , the current into the Resistance and voltage on Resistance
    how can i found it
     
  6. Ramussons

    Active Member

    May 3, 2013
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    The ONLY resistance I see is the Load.

    Unless you give a schematic, we cannot give any meaningful answers.

    Please tell us what you are intending to do. Why do you want to replace the Diode by a Thyristor? In the present setup, the Load has a Pulsating DC. A thyristor in place of the Diode will give a clipped AC.
     
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  7. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    yes the resistance is the load i mean it
    i want to do a homework about single phase full wave controlled rectifier center tap with 10 k watt
    i replace the diode because i need controlled rectifier
     
  8. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    what voltage is the secondary winding , what is the current?
     
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  9. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    the voltage in the primary is 220 volt so in the secondary will be 110 on the up half and 110 on the down half
    the current i don't know its value
    if i give you the wave can it help you
     
  10. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    That secondary is 110VAC-0V-110VAC.
    The Power of the R is 10KW.

    Assuming the former is delivering and R dissipating 10KW.
    From the diagram you provided, ⇒
    Vdc = 0.45 X 220VAC ⇒ 99VDC.
    So, Now you know DC voltage.
    Use ohms law and Power = VI equations to find R and I.
     
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  11. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    ok thank you
    but Vdc = 0.45 * 220
    can you tell me the 0.45 from where

    and the Vdc its the same v
     
  12. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Vdc is the Voltage seen by the R.
    0.45 x 220VAC ⇒⇒ 0.45 is really the formula used for center tap Bridge rectifier without a smoothing capacitor and 220VAC is the AC voltage available at the Tx secondary across the entire coil.
     
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  13. amjad..ali

    Thread Starter New Member

    Apr 12, 2015
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    thank you very much
     
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