On 08 Aug 2014 15:50:31 GMT, EngineeringGuy wrote:

When connecting "super capacitors" in series to increase the working
voltage above the level of the individual capacitors, does anyone have an
active voltage clamp that would not discharge the capacitors when the power
supply is disconnected? Most "super" capacitors have a working voltage of
2.5 or 2.7 VDC... I would like to connect 10 capacitors in series for a 25
VDC capacitor stack. Most suggestions call for connecting equalizing
resistors in parallel with each capacitor, but I would rather have a
circuit that would not discharge the capacitors when the power is off...
anyone have any ideas?

Thanks,

Bill

Supercap data sheets are universally terrible. And various "supercaps" are very
different.

You might measure a leakage vs voltage curve and decide whether they might be OK
in series without external equalization.


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John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation