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UPS (uninteruptable power supply) for computer

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Maury

New Member
Rather than purchase an expensive store-bought UPS, why not just use a 12 volt auto battery (perhaps with mains charger) along wiith appropriate voltage regulators (with nec. circuitry) , say, 12vdc , 5v and 3.3 v for emergency computer power? Dumb question? :oops:
 

nettron1000

New Member
No not a dumb question at all, thats what a UPS is mainly composed of. Its just that you left out the DC to AC convertor part.

The biggest problem with building your own UPS supply is in getting a good sinewave output. Even some of the store bought units dont produce a perfect sinewave output UPS, eventhough they will boast that they do.
 

Maury

New Member
UPS (uninteruptable power supply)

Nettron 1000 . Thanks for the answer to my question! Also, thanks to this net and the unselfish responders. I will keep on board>
 

Maury

New Member
UPS

Don't computers use only dc, 12v, 3.3v etc? Why do we need to invert the battery voltage, say, 12vdc to AC and then use a power supply to convert down to some dc level? I think I was behind the door when they passed computer smarts. :?
 

Sebi

Active Member
Because for consumers need only two connections...
and computers haven't 10...20A sockets for supply input. I've seen old ATPSU-s with in-built inverter and 12V 7Ah accu.
Of course possible to build PSU for PC with multiple outputs from 12V, but this is expensive.
 
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