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Eliminating turn off losses in IGBTs

Discussion in 'Electronic Design' started by Genome, Dec 3, 2006.

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  1. Genome

    Genome Guest

  2. Nico Coesel

    Nico Coesel Guest

    For now I say: this stuff seems rather trivial and a cumbersome way to
    do what has been done for ages in old school SMPSs. I once took apart
    a 5kW UPS. It had MOSFET push-pull stages on the bases of the output
    transistors (100A / 1000V).

    Like you already stated, an IGBT is a combined device with its
    advantages, but it is not fast by design.
  3. Genome

    Genome Guest

    Thanks for the critique. I'm probably not up to it.

    You might not be wrong but blah blah.

    I've just updated stuff with an example, 2kW boost converter off 100V at

    The IGBT became fast by design.

    I suppose you have to think it works and then do the sums, and worry about
    other stuff, to see if it is worth it. You, don't, give an example of a 5kW
    UPS supply.... Who knows?

    I accept the 'trivial' comment because, looking at it, it is. Silly thing is
    that if it was so trivial you have to wonder why it's not being done. Either
    I'm some sort of idiot or someone else is slapping their heads.....

    Go on, shoot me down.

  4. Jim Thompson

    Jim Thompson Guest

    Don't worry about it, Genome. As they say, those that can, do; those
    that can't spout platitudes like, "rather trivial".

    All good designs look "rather trivial" when viewed by ignorami...
    Bloggs comes to mind... everything I do is "rather trivial" in his
    eyes ;-)

    ...Jim Thompson
  5. Joerg

    Joerg Guest

    You could almost generalize it. Everything we all do is often considered
    trivial and offers of consulting help are initially turned down. Until
    the day of reckoning cometh (a.k.a. production ramp-up) where it plain
    don't work and it's almost too late...
  6. Genome

    Genome Guest


    It's not that I don't do it myself and it's not as if I don't do it to
    others so why not do it to me? I don't know if this one has been spotted and
    it's not as if I have a half arsed chance of becoming a millionaire over it.

    If someone shoved it up me bum I'd be a skeptic too. Still am. The concept
    might be trivial but the details are harder....... as if.

    There is probably an IEEE paper that deals with this stuff anyway.



  7. Mike Monett

    Mike Monett Guest

    I think it's a great idea. Normally, nobody would think of zapping a device
    the way you did to get it to do what you want. I love things that "break
    the rules".

    There may be an IEEE paper that references something like it, but they
    often screw it up and you can easily improve on their method.

    I think it's original, creative, and very elegant. I love to see that kind
    of thinking. Congratulations, and thanks for posting it.


    Mike Monett

    Antiviral, Antibacterial Silver Solution:
    SPICE Analysis of Crystal Oscillators:
    Noise-Rejecting Wideband Sampler:
  8. Nico Coesel

    Nico Coesel Guest

    The real-life example looks pretty clever indeed. Altough it still
    makes me wonder how an NPN transistor driven by a push-pull stage
    would perform.
    Perhaps the people that use IGBTs don't look any further.
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