IGBT/IPM power rating confusion

Discussion in 'General Electronics Chat' started by robert.guttormson, Mar 21, 2010.

  1. robert.guttormson

    Thread Starter New Member

    Oct 3, 2009
    26
    0
    Hi Everyone,

    I still am not able to come to terms with some IGBT terminology.

    Please take a look at this link
    http://www.datasheetcatalog.org/datasheet/MitsubishiElectricCorporation/mXrrtvt.pdf

    This is a datasheet for an Intelligent Power module
    I see that Pc the power dissipation is 83 W in page2. If that is the case how can the manufacture claim it is in the 2.2 KW power class(on the first page)

    Thanks,
    Bob
     
  2. Bychon

    Member

    Mar 12, 2010
    469
    41
    The load uses 2200 watts, not the controller.
     
  3. robert.guttormson

    Thread Starter New Member

    Oct 3, 2009
    26
    0
  4. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
    69
    'Resistive in watts' is nonsensical?

    The power in the load depends on the supply voltage and current the load takes; W = V * I.

    The power dissipated by the switching device depends on the current through it (same as the load) and the device's saturation voltage at that current, assuming it is driven to saturation.

    Example:
    A load around 50 Ohms that takes 10A at 500V, 5000 Watts.

    A switching transistor controlling it could have (eg.) 1.6V saturation voltage at 10A.
    It would then be dissipating just 16W.

    A transistor with lower saturation voltage would dissipate even less.

    (OK, so the load voltage would actually be 500-1.6V and the currents reduced in proportion, but you get the idea - the two power dissipations are related but very different).
     
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