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An investigation about ripple current of Kunkin KP184

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Everbrave:

--- Quote from: torch on August 17, 2023, 10:54:53 am ---
--- Quote from: Everbrave on August 17, 2023, 08:48:48 am ---Thanks a lot for the great effort. However, the resolution of the pics is too low to read the MOSFET Typ Nr., do you mind writing it down?
Also, the Firmware version would be interesting.
As for the ripple form and magnitude, it’s quite different from my board V6. I can’t explain without schematics, which I couldn’t find anywhere.

--- End quote ---

As noted, the Mosfets claim to be IRFP250M. They look pretty convincing, I don't suspect counterfeits, but who knows these days?

The second line on boot is "2303" I assume that's the firmware version?

--- End quote ---
Reverting to the older IRFP250M  from the newer IRFP264 (in V6 board) is a bit astonishing. I compared the specs thoroughly but can't think of a reason!
If I would care to have a max. junction temp of 175Deg Celsius, I would rather choose IRFP260N.
I wounder if we, V6-Board owner, can upgrade to FW2303; any ideas?
Thanks

torch:

--- Quote from: Everbrave on August 17, 2023, 03:55:38 pm ---\
Reverting to the older IRFP250M  from the newer IRFP264 (in V6 board) is a bit astonishing. I compared the specs thoroughly but can't think of a reason!

--- End quote ---
It looks like the IRFP250 has faster rise/fall times, so maybe helps control ripple. I'd like to think it's something like that, but honestly, at this price point it probably has more to do with what was on sale that week.

I still don't understand why they used the wrong DB9 connector. Or if male connectors were on sale, why they didn't at least wire it for a null modem cable instead of straight-through?  ??? Mine did not come with the cable, so I had to go hunt down a cable AND a gender changer.

Hamelec:
RS232 was always weird over the last decades   |O

Everbrave:

--- Quote from: torch on August 17, 2023, 05:09:01 pm ---
--- Quote from: Everbrave on August 17, 2023, 03:55:38 pm ---\
Reverting to the older IRFP250M  from the newer IRFP264 (in V6 board) is a bit astonishing. I compared the specs thoroughly but can't think of a reason!

--- End quote ---
It looks like the IRFP250 has faster rise/fall times, so maybe helps control ripple. I'd like to think it's something like that, but honestly, at this price point it probably has more to do with what was on sale that week.

I still don't understand why they used the wrong DB9 connector. Or if male connectors were on sale, why they didn't at least wire it for a null modem cable instead of straight-through?  ??? Mine did not come with the cable, so I had to go hunt down a cable AND a gender changer.

--- End quote ---

IRFP250M has less capacitances in general. This could also be the reason to the high frequency contents (ringing) in the ripple; but again, I am only guessing here.
EDIT: I looked-up the prices: IRFP250N is around 1.5USD, IRFP264 is around 5.3USD

torch:

--- Quote from: Everbrave on August 17, 2023, 09:58:53 pm --- I looked-up the prices: IRFP250N is around 1.5USD, IRFP264 is around 5.3USD

--- End quote ---

And there we go...  :-DD

Hey, at least they seem to have sprung for the genuine article.

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