I recently purchased a couple of Mitsubishi MG400Q1US41(EP) IGBT Modules 400Amp 1200Volt
I want to control them with a cheap lm317 dc power supply using 17v 1.5 amps. or Should I UP THE AMPS TO 3amp power supply?
Can I just connect the igbts to a full wave rectfier after the 3800uf 450v caps?
Then manually control them using the lm317 power in a separate power supply ?

at this point, im just testing them out to see what happens.

I will be feeding the 35amp 800v full wave rectifier with a 10amp variac and using a dummy load.
what would be a good dummy load? or resister wattage and ohm ?
maybe I can use the igbts somehow in a welder or high power supply.
I can always use a few extra amps for something

Thanks for the advise

 

You appear to be working on what may constitute a transformer-less mains operated device.

As such it probably would be regarded as a restricted topic. See Terms of Service

http://www.allaboutcircuits.com/l_tos.html

If you confine your questions to low voltage IGBT gate drive matters the thread may be permitted.

Remember IGBT means Integrated Gate Bipolar Transistor. You don't need substantial gate current since the gate is essentially a voltage driven entity. The gate drive control current capability only becomes relevant when the gate capacitance current requirement [usually at at higher switching frequencies] becomes significant.

 

Thus I will only use a variac or computer power supply to power this this.
Im only working on low voltage applications and experimenting with the igbts .
thank you for your concern however.

so I need not be concerned about current using these igbts?
The data sheets recommended I believe were 2 amps 17v to deliver the gates. Correct me if not. also what resistance dummy load ohm watt rating will I need?

thanks for the feedback

 

so I need not be concerned about current using these igbts?
The data sheets recommended I believe were 2 amps 17v to deliver the gates. Correct me if not. also what resistance dummy load ohm watt rating will I need?

If you have a link which points to the data sheet or are able to post the data sheet (pdf) then it would make it easier to make an informed comment.

 

this is the only pdf download I could find
http://www.datasheetarchive.com/Mitsubishi Electric IGBT MODULES-datasheet.html

It list all Mitsubishi IGBT Modules

 

4.2 Gate Drive Recommendation
(1) Gate Drive Design
For turn-on a positive gate voltage of 15V±10% is
recommended, and for turn-off a negative gate voltage from
-5V to maximum minus voltage is suggested. In order to
ensure that the IGBT stays in its off state when dv/dt noise is
present in the collector-emitter voltage a reverse bias must be
used. A series gate resistor is used to limit current flowing
through the gate. The minimum series gate resistance is given
in datasheet.​

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In theory, there is no maximum requirement for
gate resistance. However, big gate resistor may lead to​

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switching loss (time) increase​

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oscillation in conjunction with the gate-emitter capacitance
and any stray inductance in the gate drive wiring.
Therefore, the recommended maximum gate resistance is
10 times of the minimum value.
Standard resistance given in datasheet is
600V class625 (A)/current rating (A)​

1200V class313 (A)/current rating (A)

 

I checked Mitsubishi's website but could not find your device type number listed. It may no longer be in production.

As I intimated earlier the gate drive design would include a (careful) consideration of the gate-emitter capacitance which must be charged and discharged at each successive on / off cycle.

The link below has useful app notes - particularly on the practical use of Mitsubishi's IGBT's. The pdf entitled "Using IGBT Modules" considers gate drive in some detail.

http://www.mitsubishielectric.com/semiconductors/products/powermod/note/

 

Yes like many companies , they don't support their old products.
Its next to impossible to find the datasheets. I did find a cross reference
to toshiba with similar numbers

http://pdf1.alldatasheet.com/datasheet-pdf/view/31060/TOSHIBA/MG400Q1US41.html

, however, there could be small
differences . Same numbers small differences? who knows?

Anyhow you mentioned to watch out for capacitance ? I have read
that you can blow these up if you don't adhere to the perimiters.
crash and burn! I will keep safe a distance as I test these.

Any ideas ?

thanks for your info
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