> > > > > > > > > *All design is a trade of, if you can control your environment that is the > best of all possible words,no lighting strike's, no one using there cell > phone's 2 cm away from you board, clean air,no toxic chemical attacking > your connector's to deal with.And of course if you can afford the very best > Mil speck parts, that's even better.But most designers are not in that > boat, and need to do the max with the lowest cost.that where the hard work > is.* > *Lachlan* >
Exactly. Plus many people would view having to replace a part every couple years as a potential source of income - From service calls. I can say though that for our own application. Where out boards would be deployed. Power outages may not be impossible, but usually are dealt with immediately. Also, backup generators are typically in place too. So a single LiPO battery is just a low cost added bit of insurance. On Thu, May 19, 2016 at 12:40 PM, Lachlan Audas <laud...@gmail.com> wrote: > All design is a trade of, if you can control your environment that is the > best of all possible words, > no lighting strike's, no one using there cell phone's 2 cm away from you > board, clean air, > no toxic chemical attacking your connector's to deal with. > And of course if you can afford the very best Mil speck parts, that's even > better. > But most designers are not in that boat, and need to do the max with the > lowest cost. > that where the hard work is. > > Lachlan > > > > > On Thu, May 19, 2016 at 12:25 PM, John Syne <john3...@gmail.com> wrote: > >> https://en.wikipedia.org/wiki/Supercapacitor >> >> If you operate the supercap at lower than max voltage and keep the >> temperature at close to 25C, the supercap will last as much as 20 years. No >> battery comes even close. You also need to look at lifecycle cost, not just >> cost of components. If you have to switch out the battery every few years, >> then the lifecycle cost for a battery will be much higher than supercaps. >> >> Regards, >> John >> >> >> >> >> On May 19, 2016, at 2:12 AM, Lachlan Audas <laud...@gmail.com> wrote: >> >> Have a look at >> https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery >> Depending on current/temperature they have much better life, up to >> 10,000 cycles >> and much better fire safety than LiPo, you may even be able to ship then >> on flights. >> >> Supper caps, don't have a good life time, in fact they much worse then >> Aluminum >> Capacitors >> <http://www.digikey.com/product-search/en/capacitors/aluminum-capacitors/131081> >> example the LGU1H103MELB 100,000uF has a life 3000 Hrs @ 105°C and much >> more life at 25C >> and it rated for -40C to +105C, and 4.09 amps ripple ratting, and cost >> $2 in 5k >> where as the BZ015A104ZSB 100mF (100,000uF) supper cat has only 1000 >> Hrs @ 70°C and cost $6.000 in 5k >> (Digikey prices) >> So to get the Max life, use the step up switching reg to say 40V >> (remember that energy on capt is = 1/2CV^2 ) >> so double the voltage is 4 times the energy) then user a switch to step >> down to you required voltage/current >> So for max and life, only switch to the backup Caps when power fail's, >> that way they remain cool, >> give max life, and will give you good hold times. And of course all >> under mic-controller control. >> per my example circuit.. (example dose not have the control circuit, but >> can be easily added ) >> >> Lachlan >> >> >> >> >> On Mon, May 16, 2016 at 4:52 PM, Dave Loomis <d...@lumieria.com> wrote: >> >>> >>> > You can sum it all up into this; The problem is completely solved by >>> using a battery and having acpid installed. Except you need a way to >>> completely disconnect power, from the BBB's input, for a single, or perhaps >>> two corner cases that would otherwise require a hard reset. >>> >>> I love the no-nonsense mentality, and quality design behind this >>> approach for most use cases. But, for some high-reliability use cases like >>> mine -- a device permanently installed in a remote, client wall — batteries >>> aren’t a great fit. >>> >>> For long-term accessibility: Battery maintenance, even after >>> years of initial functionality, is extremely inconvenient or impossible. >>> For insurance reasons: The potential liability of >>> installing LiPo, which is known to have potential fire issues, into a >>> client’s wall. >>> For shipping reasons: The added hassle of >>> international shipping of LiPo-based systems. >>> >>> > All these fancy high cost solutions are honestly ridiculous, and if >>> you can just use an OTS UPS . . . >>> >>> Hardware cost is relative. The “high” cost (<$100) of a system >>> design is nothing, if it will potentially save me things like panicked >>> client calls, last-minute international plane tickets and high-pressure >>> field repairs. Those just aren’t fun. Obviously every project out there >>> isn’t heading to a NASA rover, but in some lines of work this kind of >>> service is expected when a high-end, mission-critical system goes down. In >>> the end, if I do my job right, the price is just passed on to the client >>> who is willing to pay a premium for a high reliability, maintenance-free >>> product. >>> >>> I’d like to be able to deploy those systems based on the BBB, because I >>> know it, find the platform highly versatile, and a good match for the >>> variety of projects I take on. I think the PRUs especially make this a >>> very unique little SoC. >>> >>> Best, >>> ST >>> >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to beagleboard+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/8A4F134B-E937-4958-8A25-E8BEDB02E6FC%40lumieria.com >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/CAMkt-MtdXLKP3VUTav_d_uGew4OAQfWT0iVSO9Zd6%2B5a0pYxUA%40mail.gmail.com >> <https://groups.google.com/d/msgid/beagleboard/CAMkt-MtdXLKP3VUTav_d_uGew4OAQfWT0iVSO9Zd6%2B5a0pYxUA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/405D3ADC-57FB-49C2-BFFF-FA6597936E08%40gmail.com >> <https://groups.google.com/d/msgid/beagleboard/405D3ADC-57FB-49C2-BFFF-FA6597936E08%40gmail.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAMkt-Mu7bxrQ7jgbvmQ02TCagEawss2QmhWF%3D3gaVLOYmRzEeA%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAMkt-Mu7bxrQ7jgbvmQ02TCagEawss2QmhWF%3D3gaVLOYmRzEeA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORo9hDo0ur7Vgi-S9%2BxNEi1Jr9gyhARZEXRKx2zR3pcM7Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
