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Is it correct to replace IGBT in UPS with a different make

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payisha

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is it correct , replacing IGBT in ups with a defferent make

I have a faulty 3kva online ups 230v 50hz single phase in /out , 72v DC bus.
The input rectifier section is ok, delivering 82V DC measured at inverter DC bus.Out put is 0 volt.

The IGBT used in inverter bridge is 2 nos toshiba MG100J2Y550 twin IGBT modules.
Replaced this 2 dual modules with Semikron SKM100GB063D and found the out put voltage 53v, AC, measured with a True RMS fluke meter.

Is it because the change in igbt that is giving such low out put voltage?

Toshiba has data sheet value Vge Min 5, typical 7 and max 8v
Semikron has data sheet value Qg Vge 0v- +15V
 

Re: is it correct , replacing IGBT in ups with a defferent make

igbt Toshiba mg100j2ys50_Page_2.jpgigbt Toshiba mg100j2ys50_Page_1.jpgigbt skm100gb063d_Page_2.jpgigbt skm100gb063d_Page_1.jpg

datasheet pages in jpg attatched.
 

Re: is it correct , replacing IGBT in ups with a defferent make

5,7 and 8 are the Vge cut off value not Vge.The Vge is ±20V. You can surely use the Semikron IGBT.
Make sure that your gate pulses are proper your driver section might have some failures when the previous IGBT failed .
 
Re: is it correct , replacing IGBT in ups with a defferent make

nikhilmahasvar said:
5,7 and 8 are the Vge cut off value not Vge.The Vge is ±20V. You can surely use the Semikron IGBT.
Make sure that your gate pulses are proper your driver section might have some failures when the previous IGBT failed .
Click to expand...

I have used the semikron IGBT, and still the out put of the inverter is zero.
The DC input to the bridge is 80v, and the inverter control card is a good one , which was tested on another similar unit and found healthy.

To verify the output of IGBT bridge inverter , can I remove the connection to transformer leads, to which the IGBT bridge output is connected, connect a 230v ac 100w bulb to the IGBT output, and power on the system?
 

Re: is it correct , replacing IGBT in ups with a defferent make

Instead of removing the txr. drain you may remove the Bridge +ve I/P supply otherwise cross conduction can happen if driver is faulty. Txr can be as it is. Once if you verify the driver o/p signal then you can continue with connecting bulb as you said.
 

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