@gregebert What is "perfect solution" with respect to the 1.1V supply? Is that your fancy FPGA soft-start setup ???
Jon J. On Tue, Oct 23, 2018 at 11:30 AM gregebert <[email protected]> wrote: > If you want absolute minimum energy consumption, then you will want to > ramp the power supply, etc. I looked at a lot of tradeoffs and calculated > the cost of energy for each. > Circuit/component costs were not modeled. > > I have the option of soft-starting my 2.5V filament transformer, because > it's controlled by an opto-triac by the onboard FPGA, which in-turn, has > AC-line sync signals, but I did not think it was necessary given the huge > reduction in surge-current with a series-resistor. Basically, the FPGA > would trigger the opto-triac just before the AC-line made a zero-crossing, > then on the next cycle a bit sooner, and so-on for about 10 seconds, by > which time the opto-triac was triggered for the entire AC-line cycle and > the filament is fully heated. > > I have yet to define how software will decide when to turn filaments on vs > off based on PIR sensor activity, time-of-day, etc. Leaving filaments on > for extended periods vs power-cycling them has a tradeoff point, but I dont > know where that lies. Also, phosphor lifetime is finite, which I'm assuming > is 25,000 hours per the MTBF in the datasheet. An older NIMO datasheet > shows 10,000 hour MTBF (ouch, that's just over a year when running 24/7). > > > Total Filaments Current (Amps) Volts Efficiency Power Tube Life (hrs) Elec > Cost Kwhr Filament Energy Cost > Perfect solution 6 0.2 1.1 100% 1.3 25000 0.1 $3.30 > 7v Supply 6 0.2 7 100% 8.4 25000 0.1 $21.00 > 10V supply cur limit 6 0.2 10 100% 12.0 25000 0.1 $30.00 > 5V curr limit 6 0.2 5 90% 6.7 25000 0.1 $16.67 > 3.3V curr limit 6 0.2 3.3 86% 4.6 25000 0.1 $11.51 > 20v supply cur limit 6 0.2 20 100% 24.0 25000 0.1 $60.00 > 16v supply cur limit 6 0.2 16 100% 19.2 25000 0.1 $48.00 > 2.5VAC xfmr 6 0.2 2.5 80% 3.8 25000 0.1 $9.38 > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/e71909e8-7f1e-4d7f-8dc7-7a389b3ccffe%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/e71909e8-7f1e-4d7f-8dc7-7a389b3ccffe%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAC%3Dcyqfs2optQVJh13_LTeUEgw5gn%3DcUmZVPQkpMmYffCAU6%2BA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
