3 ms·
Most supercaps are rated for very low voltages (this one is only rated for 2.4V), as dictated by the breakdown voltages of the dielectric and its manufacturing
by benjamincburns 13y ago
Most supercaps are rated for very low voltages (this one is only rated for 2.4V), as dictated by the breakdown voltages of the dielectric and its manufacturing tolerances. A 6V-rated 1200F supercap made from the same materials will be considerably larger. Further, most electrical engineers will enforce a factor of safety beyond the manufacturing tolerances . This is doubly true for capacitors, since dielectric failure on high energy caps can be somewhat catastrophic (read: explosive).
- ISL 13y agoHigh efficiency DC/DC converters are now commonplace. Energy density (J/m^3 and J/kg) and internal resistance are the really important quantities in energy storage capacitors.
- benjamincburns 13y agoAgreed. I discussed this elsewhere: https://news.ycombinator.com/item?id=5799723 https://news.ycombinator.com/item?id=5799723 https://news.ycombinator.com/item?id=5799713 https://news.ycombinator.com/item?id=5799713
- venomsnake 13y agoWhy would you need 6v for a phone? I got feeling this was pulled out of his ass. Everything works on sub 2V there if I am not gravely wrong (not sure for the light source for the display)
- cheald 13y agoMy old HTC Sensation drew 3.7V. http://www.amazon.com/Anker%C2%AE-1900mAh-Li-ion-Battery-Sensation/dp/B0053EZJMC http://www.amazon.com/Anker%C2%AE-1900mAh-Li-ion-Battery-Sen...
- benjamincburns 13y agoYou don't. I'd bet most of the voltage rails on a modern phone are 1.8V and 3.3V. Then the display backlight usually uses a constant-current regulator, and you'll probably have some oddball low voltages for the CPU core and other various things. Given Ohm's law you can generate all that using DC-to-DC converters.