Hi all,
Does anyone ever play with this kind of capacitor for flashlight or DC LED circuit ?
This super/ultra capacitor has monstrous capacity starting from 1 Farad to hundredth Farads (1 Farad = 1 Million uF ).
I was wondering if this cap can be use for powering small LED flashlight with DC-DC boost converter. Think of the possibilities compared to ordinary rechargeable battery (Ni-xx,Li-Ion):
- Small and light weight, some 1 Farad model is smaller than CR-123.
- Recharge time in SECONDS, e.g. within working voltage controlled by stepdown circuit from high current source like car battery the charge time can be less than 5 seconds.
- Very high count or unlimited charge/discharge cycles compared to ordinary rechargeable battery.
- It is not possible for the cap to get overcharged (in it's working voltage range). Leak or self discharge current in micro Amp (uA), i.e. it is safe to leave it plugged at car cigar ligther jack without worrying it drain the car's batt.
Now, questions :
btw, Mr.Al are you there ?
- How much energy stored in 1 Farad ? e.g. How long for 1 Farad cap can supply 3 x 20 ma LED ? or better, drives LS in acceptable time frame like 15 or 30 minutes ? Remember, re-charge time in seconds.
- How this cap affects the perfomance for DC step-up boost circuit ? Coupling it parallel with battery or C-out ?
Some links on super cap :
Power Stor supercap data sheet with excellent application notes on it's advantage for DC powered circuit.
Power Store Supercap data sheet and application notes
AVX Supercap data sheet
Cheap super cap (thanks to Marked for the finding)
All Electronics Super Cap
Vic
Does anyone ever play with this kind of capacitor for flashlight or DC LED circuit ?
This super/ultra capacitor has monstrous capacity starting from 1 Farad to hundredth Farads (1 Farad = 1 Million uF ).
I was wondering if this cap can be use for powering small LED flashlight with DC-DC boost converter. Think of the possibilities compared to ordinary rechargeable battery (Ni-xx,Li-Ion):
- Small and light weight, some 1 Farad model is smaller than CR-123.
- Recharge time in SECONDS, e.g. within working voltage controlled by stepdown circuit from high current source like car battery the charge time can be less than 5 seconds.
- Very high count or unlimited charge/discharge cycles compared to ordinary rechargeable battery.
- It is not possible for the cap to get overcharged (in it's working voltage range). Leak or self discharge current in micro Amp (uA), i.e. it is safe to leave it plugged at car cigar ligther jack without worrying it drain the car's batt.
Now, questions :
btw, Mr.Al are you there ?
- How much energy stored in 1 Farad ? e.g. How long for 1 Farad cap can supply 3 x 20 ma LED ? or better, drives LS in acceptable time frame like 15 or 30 minutes ? Remember, re-charge time in seconds.
- How this cap affects the perfomance for DC step-up boost circuit ? Coupling it parallel with battery or C-out ?
Some links on super cap :
Power Stor supercap data sheet with excellent application notes on it's advantage for DC powered circuit.
Power Store Supercap data sheet and application notes
AVX Supercap data sheet
Cheap super cap (thanks to Marked for the finding)
All Electronics Super Cap
Vic