Electronics > Projects, Designs, and Technical Stuff
Batteroo testing
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Luminax:
Whack 6 of them in series to get 9 Volt, whack a 9V connector in and put them in one of Boss/Roland's Distortion/Heavy Metal gadget and listen to the phat sound that will be produced by the interference...

I think I just gave Batteroo a marketing idea  :-DD
amspire:
To get decent efficiency over a wide range, you have to set a minimum pulse width - say 5% - and then below about 5% load, the frequency is varied. So you can get kHz switching frequencies - and big ripple at low currents. Double the current and the ripple will probably halve.
EEVblog:

--- Quote from: Fungus on December 22, 2016, 12:20:43 am ---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(!)

--- End quote ---

I'm pretty sure Batteroo said it was 1.5MHz somewhere?
EEVblog:

--- Quote from: dcac on December 22, 2016, 12:52:21 am ---
--- 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.

--- End quote ---

You mean those same capacitors in the product that help prevent the pulse current from causing the dropout voltage problem that Batteroo are so proudly sprout as the key to why their product will be so useful?  :-DD
amspire:
We can work out the output capacitor value from Frank's waveforms. With 100 ohm load, the output current is 15mA. The voltage drops about 200mV in about 150uS.

So C = 150uS x 15mA / 200mV = 11uF. So they will be using a 10uF multilayer ceramic capacitor. Probably what you would expect given the space.

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