Looking to make a small ups battery back up for a 3-6.5 1.1watt fan

Discussion in 'Power Electronics' started by kaitisinger, Dec 7, 2016.

  1. kaitisinger

    Thread Starter New Member

    Dec 7, 2016
    1
    0
    Hi!
    I just bought a small in cabinet usb powered fan. (it came with an AC adapter) Its 3-6.4v 1.1watt fan.

    After talking to the people at the electronic store, the only thing they could suggest is a HUGE 8-outlet computer battery backup power strip.

    I want to make something that is much smaller and can stay plugged in, with the fan running through it using a UPS. It would need to have a trickle charge or something to keep the battery from overcharging and shortening the life.

    I have some knowledge of electronics and wiring, and I am willing to learn much more! I would love if someone could walk me through this!

    Thanks
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    3,120
    2,052
    Inasmuch as the fan is DC operated, no inverter is required -- Keeping matters very simple you may merely connect a 6V (NiCad or NiMH) battery to a charge maintenance circuit thence to the fan (via a LDO linear regulator)... All in all you're talking maybe $20 in parts (excluding battery and fan):)

    Note: in the interests of fire safety, I do not recommend use of LiPol or Li-Ion batteries sans availability of comprehensive charging specifications therefor -- Moreover, please be advised that said chemistries are ill suited to your stated application...

    Best regards
    HP
     
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