SPICE Transformer model equivalent circuit parameters

Discussion in 'General Electronics Chat' started by CMB042, Jul 23, 2015.

  1. CMB042

    Thread Starter New Member

    Jul 23, 2015

    Using the transformer subcircuit it list 4 parameters:

    *RATIO = Turns ratio= Secondary/Primary
    *RP = Primary DC resistance
    *RS = Secondary DC resistance
    *LEAK = Leakage inductance
    *MAG = Magnetizing inductance

    Ratio and resistance I understand how to get to, but what is it asking for inductance wise? I understand what leakage inductance is, but does it want the primary or secondary leakage inductance? Does it want total leakage as in a sum? Or does it use the ratio to calculate it the secondary? I think the magnetizing inductance is the same measured from the primary or the secondary, is that true?

    If I measure the inductance of the primary with the secondary shorted, I get the magnetizing inductance plus the primary leakage. Then if I measure with secondary open, I get just the leakage. Assuming I am using a frequency in its operational range. Am I correct?

  2. garyy

    New Member

    Jun 4, 2014
    have you check the model file from linear lt spice? that should have a transformer model in it.
  3. eetech00

    Active Member

    Jun 8, 2013
    Which version of Spice?

    What transformer are you modeling? P/N?
  4. CMB042

    Thread Starter New Member

    Jul 23, 2015