Understanding IGBT's

[jimh]

I got ahold of some high powered IGBT's.  The specification sheet is at http://www.galco.com/techdoc/tosj/mg300q1us11_dat.pdf .  I will attempt to post a photo below.  I was wondering to save some of these for an upcoming wind gen project, if they have a purpose.  If not, I will let them go an ebay bidder.  I searched the forum for info on these things, but doesn't appear to have any usefull information.  Where, in a dc wind turbine, can I use these to better the system.  Or toss em'?

Jimh

It seems the pixels are a little large, but I did resize to a 293x195.

Reset the size to a narrower % its smaller but more clear.

[Flux]

You could build a MPPT scheme with them to match the load.

Could also be used as a dc heating controller in a similar way. Unless you have a fair knowledge of this technology it may be simpler to sell them, it is a bit specialised and folks here seem to like keeping things simple.

Flux

[alancorey]

Yeah, you posted a small image, Scoop made it bigger again.  It got stretched out to 80% of the table width.  It doesn't pay to post small pictures this way.

  Alan

[TomW]

jim;

I have a couple of those but the 100 and 150 amp variety. BTW those are metric threaded. 4 or 5 mm I forget which. I had to get them at fastenal since local hardware store doesn't seem to "do" much in metric.

Nice, high power devices.

Cheers.

TomW

[Nando]

The part number you have seems to be somewhat old mature product, I may be wrong.

These IGBT's are quite good, very high voltage and Current, though they will need Gate drivers capable of about 20 amps minimum for proper fast ON/OFF switching.

The operating frequency 15 to 20 KHZ.

Normally, they are used for motor control at lower frequency ( 200 to 5000 Hz)

Good for a High kilowatts MSW ( modified Sine Wave) Inverters using 140 or 280 volts battery banks.

10 - 20 KW, MSW Inverter if the batteries can handle the 100 to 200 + amps pulses.

Also, excellent for a dump load with PWM capabilities to maintain the output voltage stable.

High power MPPT charge controller.

OF curse a large Heat Sink with a blower is needed because their saturation voltage is around 2.7 volts and at 100 amps, the dissipated power will be 270 watts per device.

Nando

[RobC]

I'm using a 555 timer to turn one on and off at 60 to 100 HZ seems to work okay for that. Not sure but I think it would make a great solid state switch for a dump load. Would like to know more about those 20 amp gate drivers however. Can these be built simply and cheaply? Thanks RobC

[ghurd]

They need a `punch' to the gate to completely and reliably turn them on.  A 555 direct to the gate can't really do that (20A).

It's easy enough with a 12V system, but gets a bit crazy to keep it simple for a 48V system without exceeding the gate voltage ratings.

G-

[RobC]

I probably have a simple drive circuit in my files that will work. Thanks for the input. RobC  

[Nando]

I am including a simple circuit using small MosFets (one P and one N) to drive large Power MosFets.

The driving circuit for the small Fets can be a 555 NOT CMOS type but the regular semiconductor bipolar ( capable of about 200 ma).

I did not name the small MosFets to give wide versatility to the user, even those dual (P and N) devices with about 20 to 40 milliohms each and at least 25 volts breakdown.

I inserted two different extensions to see which one is best of the two

Nando

[RobC]

Very nice thank you Nando. RobC

[Nando]

After thinking a bit change the 10k resistor from the lower MosFet Source to the +12 volts, this way the N Mosfet ( lower one) is ON normally, keeping the high power MosFet off.

I took the circuit from a special one that I was designing and did not think long enough to insure that I was supplying a foolproof circuit.

I am inserting the modified circuit with name change

Sorry for the error

Nando

[ghurd]

Hi Nando,

In a slower circuit, maybe 1 Hz or less, can T1 be replaced with a 100 ohm resistor?

G-

[Nando]

Your question does not cover all the parameters.

Slower circuits may as well require that the Power FET or IGBT has to have fast switching to reduce its internal dissipation during the time going form ON/OFF/ON.

Unless I see the schematic and suggest the proper topology, do not try to bite the "Tiger's tail" it may roar and bite you much harder.

Nando