Sensata SSI-12HF10N Power Inverter - Cooked :(

[crashp3]

Hey Guys:

First off, my apologies if I put this in the wrong subforum. I know this is generally for AC to DC (PC) power supplies. If it should be moved, please advise!

I am currently working with a Sensata SSI-12HF10N ((datasheet) DC to AC power inverter.

This inverter is rated for 1000w continuous power, with a maximum of 1100 and 2000 max surge rating.

In any event, my buddy decided it would be smart to hook up a home vacuum cleaner to it versus using a true outlet that was 10 feet away. Immediately, the unit shut down and emitted a lovely burnt electronic smell.

Tore the unit apart (pictures below) and found several blown components. To replace, these units are roughly 500$ from my supplier (yuck!) and am curious of the feasibility of repairing this.

Most blown components appear to be minor and inexpensive, but my greater concern is if some other components could have been damaged and/or pose a safety risk while attached to the vehicle.

I appreciate your expert advice and please let me know if more pictures would assist!

Image Description
Main1 - Overhead shot of main board
main2 - side view of damaged/burnt components
main3 - closer view of damaged/burnt components
main4 - even closer view
main5 - random components not close to damage - bad? or normal?
daughterboard - There is a daughterboard that attaches to the main board (controls LED status light, fan speed, etc.), component damage
daughertooard2 - closer view

Thanks again!

[cheapie]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

Try and see if you can read the numbers off of the burnt parts (or the good ones next to them) in main3. They're probably all the same.

P.S.: I think this is the right subforum. It IS a power supply, after all.

[DJduck]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

You might want to check some other parts too before replacing them. If anything else is shorted or burnt out then the chances are that one you replace the transitors/fets they will blow out again.
Also, make sure you replace all the resistors that have burn marks

[ben7]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

Looks like the MOSFETs for the step up transformer have gone pop. I'd replace them with some better ones too next time.

Be sure to check the mosfet gate resistors (they look to be 10 ohms), and the mosfet drivers (not sure where they are). They are likely damaged.

Those diodes on the two small heatsinks look to have popped too. I'd replace them with some bigger heavy-duty diodes, not cheap DO-201 plastic ones (just like the diodes that have blown).

Can you provide a picture of the back of the control board? (the daughterboard)

[crashp3]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

Looks like the MOSFETs for the step up transformer have gone pop. I'd replace them with some better ones too next time.

Be sure to check the mosfet gate resistors (they look to be 10 ohms), and the mosfet drivers (not sure where they are). They are likely damaged.

Those diodes on the two small heatsinks look to have popped too. I'd replace them with some bigger heavy-duty diodes, not cheap DO-201 plastic ones (just like the diodes that have blown).

Can you provide a picture of the back of the control board? (the daughterboard)

Alright, did some research earlier today and here's what I came up with.

The blown MOSFETs are IXSYS Trench2 Power MOSFETs (IXTA110N055T2 - datasheet) and there are two different MOSFET gate resistors, I'll refer to it as front row (farthest from heatsink R30, R29, etc.) they are 10ohm resistors, back row (R38, 37, etc.) are 10Kohm resistors.

The small black thing on the daughterboard that appears burned is an NEC PS2561-1 photocoupler (datasheet).

Unfortunately, the back of the control board has some type of paint/substance protecting the leads... here is a pic, any recommendations on removing this crap? Didn't appear to willing to peel back with my fingernail.

I'd appreciate any recommendations on better components to replace the MOSFETs with -- I'm not good at finding suitable replacements, just googling the numbers and ordering on digikey

Thanks in advance for the help thus far!

[ben7]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

Ughh! Looks to be lots of stuff on the backside there. Under the silicone-lookalike stuff, that is.

You could try just replacing the 10 ohm resistors, those diodes, and the mosfets, but if it still doesn't work then I don't know what else to say. It's a gamble.

[crashp3]

Re: Sensata SSI-12HF10N Power Inverter - Cooked

Yes, a ton of stuff! In looking at it further, the control board (when mounted to the mainboard) is close to the MOSFETs that blew, and coincidentally the black daughterboard component faces exactly right next to the blown MOSFETS.

I am hoping that the component isn't bad (I'll replace that and the corresponding cap) but just got blackened when all the MOSFETs blew being its in very close proximity to that area. I see no other indications of damage to the daughterboard.