Re: Igbt <-> mosfet
Oh I chickened out sorta. I found some old IGBTs but they're nowhere near the ideal specs... Soldered them in and ..well.. it looks like the GTI is alive! Well, not sure, hard to tell, need to see my grid power consumption and see if it changed any with it turned on, but for once my solar panels may be making their pay...
It's unfortunate my Kill-A-Watt doesn't deal with back power, but I think I have an idea on how to deal with that...
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YEP IT'S WORKING! Now I need to go order real IGBTs to do a proper fix!
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Re: Igbt <-> mosfet
I'm pretty sure this GTI was not properly grounded as it's an ad hoc inverter not to mention it's "CCS". The "CCS" aspect may be sufficient cause for failure to begin with. The failed IGBTs still look intact (one with all pins shorted, other with C-E short) so it's possible it's not lightning too... *shrug* no clue other than CCS syndrome.
What kind of stuff was changed when someone swapped in IGBTs for MOSFETs?
I was looking at the drive requirements for the two and they were quite similar but the voltage needed for IGBTs were somewhat higher - which makes sense due to needing to also overcome the drop in the BJT. I'm wondering if I stick in a few diode drops but have to do this carefully as it'd affect bother up and down, perhaps inverse parallel diodes.
I haven't decided on a temporary replacement yet, have to worry about voltage and current, I don't have anything close at all so I will have to put in an order at some point.Last edited by eccerr0r; 08-03-2023, 06:05 AM.Leave a comment:
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Re: Igbt <-> mosfet
I am running a grid tie inverter for 10 years now and it never missed a day. Lightning is no problem for anyone that has proper grounding installed.
I’ve seen folks changing out Mosfets for IGBT’s, but you wanna do IGBT’s for Mosfets. Never seen someone do this, but I think while it could be done there are certain things that do come in play. Heat of the Mosfets is one. The other one would be the gate drive resistor. While IGBTs have a higher gate drive resistor the Mosfet have a lower gate drive resistor. However we don’t know what Mosfet you try to sub what IGBT for. I guess there are more details needed to get a better answer.Leave a comment:
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Igbt <-> mosfet
I've played fast and loose with components for the heck of it (and mainly to use the stock I have) but I have a new substitution to try in order to not have to order components.
I'm going to try to 1:1 replace IGBTs with MOSFETs...
The current carrying capacity of the MOSFETs are not going to be as good as the IGBTs, but the IGBTs seem to be quite overspecced to begin with, so maybe it's not so bad. I'm going to derate other components like fuses for the time being to save the MOSFETs.
Any other things I should look out or is this foolhardy and all I'll get is
?
Hopefully will get some sign of life from the grid tie inverter until I can order bona fide IGBTs. And theoretically should be able to determine if it has a dead time violation that caused the IGBTs to fail to begin with, though I feel like it was more likely lightning...
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Hi,
Finally got time to fix this board up.
At first it didn't give any POST codes. Turns out it was an unsupported Celeron D cpu. After dropping in an Celery 2.6gHz the CPU came out of reset with clock signal, but still no post codes. For a while it did work when I applied pressure to the ADP3168 chip, but on next reboot the MOSFETs started to burn. Then I left it as is for months.
Now I came back prepared. Replaced the bad MOSFETs and the ADPxx18k drivers. Now I don't get any MOSFETs blowing up issues anymore. But sadly, the Vcore is missing. The whole VRM isn't... -
I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM -
hello.
I have two power amplifiers, both having their IGBT blown on the PSU.
The original mounted IGBT where marked with IRGB20B60PD1PbF and the gate driver is a IR2156STRPBF.
I looked at mouser and digikey and could not find any available IRGB20B60PD1PbF and somehow ended up using a Bourns BIDW20N60T.
I replaced the gate driver, the gate resistor and both IGBT. But as soon power is turned on, both IGBT shorts out completely (gate, emitter, collector) and the fuse on the AC line gets killed.
So I though i missed a capacitor or diode. I removed... -
Hey guys,
i have a asus motherboard here and as the title says after the first mosfet (in the picture) there is nothing more than 3.15v.
I injected 19v and max. 1 amp at the charging port and there is not voltage drop or smth. It's just taking 19v and 1 milliamp.
Then i tried to inject 19v and max 1amp after the current sensor and there it first takes 19v and 4 milliamps and after 2 seconds it is taking nothing (no current).
I measured on the coils on board everything seems fine. Also the main power rail is not shorted (infinite resistance).
Now i thought something... -
The board number is GU502DU. I repaired this a couple weeks ago and it came back with the same issue, same mosfet failed (PQH9201). I'm hoping that the GPU was spared this time.
I used the same replacement part (purchased from Mouser) and I'm certain the soldering was done properly since it took just as much effort to remove as before. What could cause this same mosfet to fail? I'm thinking if it was unsuitable then the others would fail too. I looked for similar failures on YTube and the mosfet was replaced with AOE6930 in one instance and AOE6932 in the other but it's possible that the...
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