How to Test an IGBT (STGW20NC60VD)

You could google on the part number and read the datasheet, there's also a whole page of testers for you to clone if you search properly. You could also patronize the folks that our sponsors GlobalSpec provide.

I'm going to take a stab, and say you probably don't need a full-fledged curve tracer or power IGBT measuring instrument. That's because generally power MOSFETs and IGBTs don't fail gradually, they fail catastrophically. If it was a MOSFET, you could use an ohm-meter to simply verify that it doesn't have a drain-to-gate, drain-to-source or gate-to-source short. The IGBT equivalent pins would be a C-G short (pins 2 to 1), a C-E short (2 to 3), or a G-E short (1 to 3).

Mosfets have an intrinsic DS diode, but IGBTs don't naturally have a diode. But some, especially very fast ones, have an added diode built into the package, to protect the part from excessive C-E turn-off ringing levels, e.g., over 15 volts. Specifically the ST stgw20nc60v parts do not have diodes, but your stgw20nc60vd does have one (note the D suffix).

Put your ohm-meter into diode measuring mode, and repeat the tests. All possible connections and polarities should be open except for the E-C diode (note direction).

There is more to the story. IGBTs include an internal PNP transistor and therefore their conducting channels take a bit more voltage than mosfets to operate, so you might want to rig up a slightly-complex bench test before giving it a more complete AOK.

Connect E to ground, tie C to +12V through a 1k-ohm resistor, and tie G to a 100k resistor, and temporarily connect the other end to ground. Turn on the +12 power. C-E leakage should be low, so C should not draw any current through the 1k load, and sit right at +12V. Likewise gate leakage should be low, and G should be sitting at 0V. Disconnect the grounded end of the 100k resistor and leave it floating. The device should remain off, with C at +12V. (The gate voltage is held at 0V by its internal 2200pF capacitance.) Add a jumper connecting the open end of the 100k gate resistor to +12V. Now the device should be turned on. You should measure +12V on G (no voltage drop across the 100k) and C should be saturated at about 0.7 volts (the value is not critical). Disconnect the 100k from +12V and leave it floating. The IGBT should remain on, with C at the low saturated voltage. If your IBGT passes these tests, it's probably fine.

thankyou very much, but please keep in touch because tomarrow i will go to the tests which you are mention here.

Regards

Also guide me for my another question listed in GENERAL FORM and his title is " Honeywell CSNA111 testing"

please guide us...

because i am working on AC BRUSHLESS MOTOR CONTROLLER and lot of testing components are there which need to be test on board...