On Thu, 14 Aug 2014 12:52:10 -0700, Jim Thompson
wrote:
On Thu, 14 Aug 2014 12:36:24 -0700, Jim Thompson
wrote:
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
Food for thought, see...
http://www.analog-innovations.com/SED/ChargeLimiter_SuperCap.png
Obviously the charging current doesn't need to go thru the LED's in
the OptoCouplers, but some means is needed to tell the TL431's to turn
off.
Perhaps parallel the LED's (with ballast resistors)?
...Jim Thompson
As in...
http://www.analog-innovations.com/SED/ChargeLimiter_SuperCap_v2.png
...Jim Thompson
Less sensitivity to OptoCoupler CTR (current transfer ratio)...
http://www.analog-innovations.com/SED/ChargeLimiter_SuperCap_v3.png
...Jim Thompson
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