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Ultracapacitors

A

Anonymous

Guest
There is a nice little survey article on ultracapacitors on pages 42-44 of the 1 March 2001 issue of EDN Magazine. Ultracapacitors can deliver far higher current pulses than batteries, but have less total energy storage capacity, for a given size. The combination of a ultracapacitor and a battery allows the pulse currents to come from the capacitor but the overall energy capacity to be determined by the battery.
One possible fly in the ointment is that not all ultracapacitors are efficient when delivering millisecond pulses. AVX claims to have solved this problem in their BestCap line, but I don't know just how serious the problem really is.
Given that ultracapacitors are electrochemical systems, they may have lifetimes more like batteries than like ordinary capacitors. Again, this is more a suspicion than a statement.
Joe
 
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