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Circuit Diagram/ Block Diagram of IGBT tester

Discussion in 'Misc Electronics' started by raju, Nov 8, 2003.

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  1. raju

    raju Guest

    I am a student of Electrical & Electronics Engg. I have been given
    "IGBT Tester" as my final year project at SIEMENS. I needed some
    information on how to exactly an IGBT is tested. It would be of great
    help if anyone could explain me the working of an "IGBT tester"
    preferably with a block diagram.
     
  2. Depends on what you want to test. It could be as simple as a 9V battery,
    a pushbutton, two resistors and a led.

    I would start looking at various datasheets, see what looks as the
    most interesting aspects of a IGBT, and then decide what needs to
    be tested/measured/verified and estimate what can be done in the
    time available for this project.

    If you need inspiration, here's what seems a nice tester:

    http://www.lemsys.com/FicheTRD2030-2.html

    ;-)
     
  3. Tim Auton

    Tim Auton Guest

    Without ever asking anybody for help? Do they even let you read books?

    He said it was a final year project, he's going to have to do a whole
    lot more work whatever help he gets here. A few usenet posts don't
    make a final year project.


    Tim
     
  4. Yeah, but let's be fair. These IGBTs are usually heavy duty, high
    current devices. A serious test is going to need a bit more current
    than a 9V battery can supply. OTOH, if the pulse duty cycle is very
    low, it might be possible. But the gate driving circuitry is probably
    going to need more than a 9V battery.
    Jeez, 3000V at 2000 A (cough-cough!) Requires 230VAC at 16A! Just
    the shipping alone will cost a whole lotta money! Whew!

    Like, here's a piece of equipment that takes more juice than the whole
    average home uses. Nice to plan ahead to make sure you can afford the
    electric bill. Remember those Startrek episodes where they had to
    make a choice between weapons and life support? Cap'n says Fire! and
    we hear the 'PLOINK!' in the background and all the lights go dim.
    COOL! Just testing another IGBT..

    --
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  5. Watson A.Name - "Watt Sun, Dark Remover wrote...
    Yes, an enjoyable scene to contemplate. But reality is a bit more
    prosaic for these devices: banks of electrolytic capacitors charged
    at leisure (230Vac at 16A is under 4kW - probably on the order of my
    home HVAC), then operate at the rated voltage and current (6MW) for
    a few milliseconds for the measurements. I made a 1.2kV 200A pulse
    generator (0.25MW, 5ms) in a 7" relay-rack box, and it was half empty.
    Although Lemsys' 6MW capability is 25x higher, it's not necessary for
    Raju to get into that territory. He could make something on the same
    size order as my box, big enough to test IGBTs up to TO-247 case size.

    Thanks,
    - Win

    whill_at_picovolt-dot-com
     
  6. Winfield Hill wrote...
    Just an added thought. One must pick an reasonable scale and then be
    satisfied with that. In the high-power engineering field someone,
    someplace is always making, or already has made something bigger.

    For example, consider the impressive 6MW rating of the Lemsys tester
    mentioned above. Yet it's a real wimp, completely unable to handle
    the 400MW capability of a single Dynix PT85QWx45 5" SCR puck (4.5kV
    90kA peak), http://www.dynexsemi.com/products/pulse_power/index.htm
    And if one were to design a tester capable handling the PT85QWx45,
    then how about testing an array of these beasts, say as required for
    a STATCOM (static reactive comnpensation) installation in a typical
    utility transmission line? Should such a tester be devised, it'd be
    completely unable to handle the serious testing requirements of DC
    high-voltage transmission-line converters. So on and so forth.

    Hmm, perhaps Raju can satisfy himself with testing small IGBTs, say
    up to 600V 5A (130A max) parts; thaht's a more managable 80kW max.
    There's quite a selection of cute little so-8 guys with this rating
    intended for the huge flourescent ballast market, like Fairchild's
    FGS15N40L, see http://www.fairchildsemi.com/pf/FG/FGS15N40L.html

    Thanks,
    - Win

    whill_at_picovolt-dot-com
     
  7. CWatters

    CWatters Guest

    Try contacting an IGBT manufacturer. Ask if you can come and see them test
    some IGBT. Tell them you are a keen student and they might even fund the
    trip!
     
  8. CWatters

    CWatters Guest

    Oh you've got it all wrong. These days nobody can know everything and it's
    more important to show you know where and how to get answers quickly than to
    re-invent the wheel.

    When I was in the air cadets (20 years ago) we stayed on an airbase for a
    week. The staff decided to set us an exercise.... we had to make a map of
    the base, then pretend we were terrorists and mark on it where we would
    place 3 devices to best "take out the base". Not wishing to walk miles in
    the rain our team went to the guard house and asked for a map. The person on
    duty gave us a photocopy that showed just the outlines of the buildings and
    not what was in them... so we told him we were "terrorists" and he helped
    fill in the blanks and told us where to place our devices.... "Those three
    blocks are the hangers" he said "..but only that one has any aircraft in
    it". We were job done in 10 mins while the other groups got a soaking.
     
  9. Colin

    Colin Guest

    Hello,

    You could do some reading at IXYS website, look them up. They have PDF
    files on IGBTs' and MOSFET's and how to drive them, it could be useful to
    you.

    A "curve tracer" has been traditionally used to test semiconductors in
    operation. they have selectable voltages and currents for the gate circuit
    and the power supply, I'm sure a curve tracer could drive a low powered
    IGBT with the proper gate voltage. They do a dynamic test where the gate is
    stepped with increasing voltage or current and the CRT display shows the
    response of the device under test. There have been projects and even kits
    at one time to build one of these. The simple ones uses an oscilloscope,
    ch1 and ch2 inputs are set to X-Y mode and the curve tracer plugs into them,
    then connect the component to test and set the dials. The master power dial
    is a power supply voltage control, usually up to 80 volts I've seen.

    I've also seen a light dimmer modified with test leads brought out from the
    triac connections to test different triacs. This simple tester tests triacs
    in all polarities. A full dynamic test.

    I hope these help,

    Shaun
     
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