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power dissipation of the datasheet of an igbt, and real power dissipation

Discussion in 'Electronic Design' started by overgeo, Jul 27, 2006.

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  1. overgeo

    overgeo Guest

    Hi, I'm designing an inverter, the characteristics are DC bus voltage
    300V, Irms = 30 A, pwm frecuenzy 100 Hz, and a maximum junction
    temperature 80ºC, i have used this calculator

    to stimate the power losses and i get 160W and the aproximate
    resistance of the heat sink is 0.117 ºC/W, the igbt that i have
    choosen is this, IRG4PSC71UD in the datasheet says that maximum power
    dissipation at Tc = 100ºC is 140W, so the igbt will be able to
    dissipate my power losses?, according to the datasheet yes, if that
    igbt can't dissipate my losses, this igbt will be able IRGPS60B120KD?,
    the datasheet says that Pd at 25º is 600W and at 100ºC 240W,
  2. overgeo wrote...
    The second part has a larger die, and hence a lower junction-case
    thermal resistance, but it's a 1200V part (whereas you can get by
    fine with a 600V part), so it has poorer C-E saturation voltage,
    e.g., 2.5V vs 1.83V at 60A for the first part. And you could do
    even better with a large-die 600V part.

    Dunno about the calculator, e.g., it's not obvious how they can
    calculate switching losses without knowing gate-drive current and
    without specific IGBT knowledge, etc., and their default package
    case-sink insulator thermal resistance appears too optimistic.
    I'd want bench verification before relying on the calculator.
  3. overgeo

    overgeo Guest

    Winfield Hill ha escrito:
    Thanks for your answer, sorry about my description of my calculator i
    only give the info about my inverter not about the calculator, in the
    calculator of course you got to put the thermal resistence, the voltage
    drop of the diode, the r on of the igbt and the r on of the diode, the
    t rise, t fall and some more parametres.

    I said the second part because is the discrete igbt that i have seen
    with the biggest power dissipation. I prefer use a 600V igbt, that it
    adapts better to my specifications of voltage and current and i get
    lower power losses. can you tell a 600V igbt wich can dissipate my
    power losses?, thanks so much.
  4. not to appear to be overbearing, but I will soon be selling 300A, 600v
    half bridge IGBTs for 15 dollars apiece. They are very large and can
    dissipate a lot of heat, pretty good deal for the price and your
    little 30a current.

  5. Ignoramus24559 wrote...
    A large IGBT module, good choice. Two appealing features of
    these modules are the integral heat-sink insulation, and the
    captive-nut high-current wiring. What's your p/n?

    One unappealing feature of IGBT modules is their high price,
    but this is ameliorated by their availability on eBay from
    sellers who remove them from old 3-phase motor drives, etc.
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