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
    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!

  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    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