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The application for high voltage igbt(1200 ~ 1700 V)

Discussion in 'Electronic Design' started by Savoir, Jul 20, 2005.

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  1. Savoir

    Savoir Guest

    Dear All,

    First of all, I have to say that I'm just a newbie in this field.
    I know the fact that high voltage igbt is used in some industry such as
    X-Ray,Inverter or welding device.

    But the problem is those three are all I've known.
    Pls, teach me about other applications specifically.
    I vaguely recalled that it can be used in some kinda of plasma machine
    or pdp machine something like that.

    please, help me.
    I'm not engineering major.
    I'm economics major.

  2. Terry Given

    Terry Given Guest

    IGBTs are available with voltage ratings from 600V to 6.6kV (6600V). The
    6.6kV IGBTs can be used to create inverters running from a 3.3kV AC line.

    IGBTs are commonly used at power levels from 1kW to 1MW. I have used
    small 1400V IGBTs in a 50W flyback converter running from 1000Vdc, as
    well as in a 1MW 3-phase inverter running from 480Vac.

    The biggest IGBT I have seen is a device that will switch 1200A at
    3.3kVac, so about 3.5MW. With these sorts of devices IGBTs converters
    are now feasible in the 1MW - 10MW power range.
    The IGBT is just a switch. what you do with it depends on the
    application, but invariably is an AC-to-DC (or DC-to-AC) converter.

    A welder for example has an AC-DC converter which connects to mains
    electricity (this may be IGBTs, but is usually a diode bridge). This
    generates a high voltage DC bus (~ +300V for 230Vac, +600V for 400Vac),
    to which is attached a DC-AC converter (using IGBTs). This generates
    high-frequency AC (anywhere from perhaps 10kHz to say 500kHz), which is
    fed into a nice small high-frequency transformer. The AC output of the
    transformer suually goes through another AC-DC converter (either a diode
    bridge or one made with FET synchronous rectifiers, IGBTs are not much
    use at low voltage) and then thru a large inductor to the welding piece.


  3. Savoir

    Savoir Guest

    First of all, I can't thank you enough.
    But unfortunately, I don't get it.
    Actually, I want kind of answer like X-Ray or Welding device something
    like that.
    And most of all I want something related in 1200v or 1700v igbt or same
    voltage Fet.
    I heard some Inducting Heat maker need this kind of IGBT. Am I right?

    I just want very specific answer, not kind of inverter something.
    I need the different manufacturers or specific industry which need this
    kind of IGBT or FET or even Diode.
    1200Voltage or 1700 Voltage is pivotal for this question.
    Pls, advise me again.
    It would be very much appreciated if you teach me concretely.
    Thank you

  4. Terry Given

    Terry Given Guest

    I'd like to see a 1700V FET...

    1200V IGBTs are used for equipment operating from 400Vac

    1700V IGBTs for 690Vac operation

    6.6kV IGBTs for 3300Vac operation

    motor controllers, welders, UPS, power conditioners, harmonic
    compensators, active filters, DC power supplies - the list goes on....
    I've built induction heaters using little SO-8 MOSFETs. Admittedly they
    were very small induction heaters :)

    I have read of IGBTs used in large (MW) induction heaters. A place I
    used to work for made a 400kW induction heater out of a (1200V) IGBT
    motor controller, simply by connecting a suitable coil (around a large
    crucible). Ultimately an induction heater is simply an inverter.
    there isnt really a specific answer. IGBTs are useful over a power range
    from about 1kW to 10MW. Pretty much any job within that power range can
    be done by IGBTs. FETs stop at about 10kW or so.

    GTO's tend to be used from about 1MW up to 1000MW. IGBTs have pretty
    much taken over GTOs at lower power levels.

    based (as above) on AC voltage rating.
  5. Terry Given wrote...
    .. mtw6n100 (2)
    .. D --+--- d s --+- d s --+-- S
    .. | g | g |
    .. | +-|<|-' +-|<|-+
    .. | 220p | 220pF | 10V | 1.7kV 2A
    .. +--||--+--||--, | | use with care
    .. '- 1M -+- 1M -+-- | ----'
    .. 1W 1W |
    .. G

    Of course any self-respecting IGBT will beat the pants off it...
    Not much safety margin for the latter two.
  6. If it's marketing information you're looking for, this newsgroup is
    probably not the best place to look. One good source of free
    information on applications is promotional literature from
    manufacturers, although they may omit entire market segments for
    various reasons. There are also industry surveys in the trade
    literature, and they often give away a certain amount of free info in
    order to get you to read the magazine and purchase the expensive full

    There are also a lot of cross-connections in the power semi industry-
    joint ventures and so on. For example, if you were trying to sell
    power semis in the welding field, you might look to the US company
    Thermal Dynamics, who offers one of the more popular AC/DC inverter
    welders (as well as plasma cutters). But you'd quickly find that it's
    a brand-named unit from a Japanese company, and a company that itself
    manufacturers the semis at that, so there is little chance to sell
    (say) Korean semis to them.

    Best regards,
    Spehro Pefhany
  7. Winfield Hill wrote...
    Here's my low-power 2.5kV linear MOSFET, with 4mA current limit.

    .. FQD2n100 or FQU2n100 (3)
    .. D --+--- d s --+- d s --+- d s --+- c e --+- 150 -+-- S
    .. | g | g | g | b | |
    .. | | 10V | | 10V | | 10V | | b |
    .. | +-|<|-' +-|<|-' +-|<|-' +-- c e ----+
    .. | | | | 10V | |
    .. '- 6M -+-- 6M ----+-- 6M ----+----|<|-- | ------------'
    .. |
    .. G

    No gate-resistor capacitors, BJT-improved-transconductance, use at
    100uA with f_T = 300kHz. The MOSFET gate zeners may be optional (!)
  8. Terry Given

    Terry Given Guest

    nice. technically its 2 FETs though, but best nobody look too hard at
    whats inside a FET (or an IGBT) :)
    Ultimately it boils down to the reduction of stray inductance. I read an
    article (IEEE PELS IIRC) not so long ago on the use of (Eupec?) 6.6kV
    IGBTs at 3.3kV, about 4650Vdc. 2000V is a fair old bit of margin.

    But when you consider the switching times (1us or so), the kA current
    and the relatively high packaging inductance, 2kV can disappear real
    fast. 100nH is a pretty small inductor, and 1kA switched in 1us thru
    100nH is 100V. Thats a breeze to deal with.

    Alas when things go wrong and the IGBT desats, the current is more like
    10kA, and voila - there goes a kV or two, ka-Boom.

    OK, so I downloaded this IGBT datasheet:

    call it 500A, with 0.5us switching times. package inductance is 18nH so
    a half-bridge is at least 40nH. Because of the high voltage, it will be
    difficult to keep total inductance below about 100nH. Its a seriously
    less than useful datasheet, no fault current info at all, but 10x is a
    good guess.

    So the previous calc is in the ballpark for this IGBT, meaining you
    could build a 3.3kVac inverter with it running from a 4.7kV DC bus, but
    you'd better pay close attention to minimising L and dealing with
    desats, which will eventually happen (eg when one IGBT die becomes
    sufficiently detached from the baseplate to overheat & fail short-circuit).

    If the desat current is more like 20kA, then for 100nH the IGBT will be
    over-voltaged and fail pretty much immediately upon turn-off.

    so 2,000V aint that much headroom at all ;)

    690Vac gives a nominal 1kV DC bus, during regen it might pump up to say
    1200V. But its a low enough voltage that the DC bus inductance can be
    extremely small (1nH), so the limiting factor is simply the device
    interconnects, which tend to be around the 20nH mark (eg SKiM, SEMiX)

    the fault currents are more like 1-5kA, but switching times are around
    0.2us, which gives 100V - 500V spikes. Once again they will work fine
    during normal operation, but require attention under fault conditions,
    especially during regen.

  9. Savoir

    Savoir Guest

    Your mention is just great.
    Yeah, I want to try to know the marketing information.
    But I don't want to try to sell korean semi to USA company such as
    Thermal Dynamics.
    In contrast, I want to try to sell USA semi such as IXYS to Korean
    company like welders.
    I've tried a lot of promotional literature from manufacturers, but I
    couldn't find very specific end-user.
    Maybe, the magazine has an answer for me.
    Please, recommend this kind of magazine.
    I'm gonna buy some.
    I must study this field.

    Best regards,
    Derek Byun
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