Electronics > Projects, Designs, and Technical Stuff
Batteroo testing
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cowana:

--- Quote from: FrankBuss on December 21, 2016, 10:03:44 pm ---Would be cool if someone with ESD/EMV equipment could take a look at it, or verify the efficiency results with a non-bricked eload, or test the current limiter.

--- End quote ---

Would be great to see their EMC tests repeated with a realistic current draw, rather than the 1k load (IIRC) load they used!
amyk:


The efficiency is pretty bad, but so is the line regulation; I wonder if the latter is deliberate, and they were thinking all along about battery gauges?

It looks like a variable-frequency converter. The ripple is not surprising given it basically has no output filtering.
Fungus:
Wow! That's switching at a really low frequency. Efficiency and ripple will be a total disaster at <10kHz with such a tiny inductor. It should really be working in the MHz range(!)

( I'm off on holiday in a few hours. Looks like I'm going to miss all the fun.  >:( )
dcac:
At least 2 uA quiescent draw are not so bad, I think Jay_Diddy_B's batteriser prototypes was about 20-30uA.
dcac:

--- Quote from: amyk on December 22, 2016, 12:20:43 am ---
It looks like a variable-frequency converter. The ripple is not surprising given it basically has no output filtering.

--- End quote ---

They are probably relying heavily on capacitors at the battery input in the 'DUT' for filtering, but there could be anything from nothing to hundreds of uF and no clue to what quality caps they are either.

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