I am currently trying to hack a
Meishile SMPS S-200-36 to make it charge a
10S4P Li-Ion battery pack (880W).
I first tweaked the
RV1 pot to tune Vout up to 42V (10S4P/Li-Ion) : quite easy, no need to adjust the TL431 bias resistors to offset the adjustment, RV1 was sufficient to obtain 42V.
Then I tried to tweak
R1 (Isense resistor) to make the SMPS stop hiccuping once it's connected to the battery pack (the initial current demand surely is in excess of 5.5A, resulting in the PWM controler to hiccup for protection).
From the initial 0.1R value, I tried 0.2R, 0.5R and also 0.05R down to 0.02R ... to no avail, still hiccuping.
Meanwhile, I reverse-engineered the PWM controller and output stages to make everything quite clear in my mind ...
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But now, I am stranded ... I don't know what to test or do to get rid of the hiccuping.
I am pretty sure the initial rush current demand from the Li-Ion BMS is not
that high (certainly >5.5A, though) and is definitely
transientI also think that the SMPS mosfets could
temporarily cope with this transient inrush ... well, that's my guess ;-)
Has someone any clue ?