"average forward current" formula

Discussion in 'General Electronics Chat' started by Richard Lim, Oct 26, 2010.

  1. Richard Lim

    Thread Starter New Member

    Oct 25, 2010
    1
    0
    Looking for some formula to calculate "average forward current" for thyristors.
    Most thyristors spec are in "average forward current" but I cannot find any formulae for this.

    Only 1 reference I found so far in a handbook as it is dependent on conduction angle.
    Assuming I want to conduct for full 180 deg, what would be the "average forward current"? Say 100Arms on 50Hz sine wave.

    Is it the area under the sine?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    The average of a half wave sinusoidal current = Imax/∏

    So If Imax=100A

    Iaverage=100/3.1415926=31.83A

    If Irms=100A then Imax=141.4A

    So Iaverage=141.4/3.1415926=45A

    In general Iav(of a simple half sine)=0.4502*Irms
     
    Last edited: Oct 27, 2010
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