need to build a UPS for computer - Electronic Circuits Projects Diagrams Free

charmer · 3rd March 2008, 02:51 PM

Hello Friends,!

I am looking forward to provide my cpu + monitor a 1hour backup when there is no electricity. As soon the power fails the UPS relay should be able to pick up the load thus not keeping the system running smoothly. When the power comes back the UPS should be able to shift back automatically.

I would like to do this for my project and should be easily done in home with less expensive tools.

I think what i would be needing is,
1000W rated inverter
Car battries

But how to make them work with the cpu?

Please comment/suggest

Thanks alot.

blueroomelectronics · 3rd March 2008, 04:57 PM

Pie in the sky.
You're dreaming, it'll cost you more than buying one.

Kryten · 3rd March 2008, 07:57 PM

why dont you just google??

Here is a couple of links:
http://www.dansdata.com/diyups.htm
http://www.edn.com/contents/images/41102di.pdf (for USB device but anyways)
http://icrontic.com/articles/super_ups (looks to be the best)

Papabravo · 3rd March 2008, 10:43 PM

Quote:

Originally Posted by charmer

Hello Friends,!

I am looking forward to provide my cpu + monitor a 1hour backup when there is no electricity. As soon the power fails the UPS relay should be able to pick up the load thus not keeping the system running smoothly. When the power comes back the UPS should be able to shift back automatically.

I would like to do this for my project and should be easily done in home with less expensive tools.

I think what i would be needing is,
1000W rated inverter
Car battries

But how to make them work with the cpu?

Please comment/suggest

Thanks alot.

A bouncing relay would never be fast enough.
Buy one - you cant make it as cheap

rjvh · 4th March 2008, 02:07 AM

same advice as the others buy one

what you can do is buy a lighter model and change the batery pack your self

if it is only your computer (if you have a lcd screen) a small 650W inverter would do it already for a long time you increase the baterry size your self and you have your extra time

Robert-Jan

I²R · 4th March 2008, 01:52 PM

Building a UPS from the ground up is like making a copy of Romeo and Juliet by buying magazines and cutting out the words aned pasting them to blank pages: you can do it, but it'll take a long time and you'll wind up paying way more than if you just bought it.

blueroomelectronics · 4th March 2008, 03:40 PM

Quote:

Originally Posted by I²R

Building a UPS from the ground up is like making a copy of Romeo and Juliet by buying magazines and cutting out the words aned pasting them to blank pages: you can do it, but it'll take a long time and you'll wind up paying way more than if you just bought it.

Tell that to the members at Electronics Lab

audioguru · 6th March 2008, 10:13 PM

I am also a member of Electronics-Lab.
I helped fix an old inverter design there that didn't work. It uses old 2N3055 transistors because Mosfets are not available in the 3rd world nor in the 4th and 5th worlds.

I can buy a pretty good and cheap inverter that was made there. Those people can't buy it.

blueroomelectronics · 7th March 2008, 12:04 AM

Audioguru you ARE electronics-lab, if you didn't post the forums ther would be an electronic wastebasket.

The let wise old man be a moderator and he's like 8yrs old, maybe they'd let you moderate.

Can't see why eplanet isn't a moderator?

Hero999 · 7th March 2008, 10:56 AM

Audioguru use to be a moderator overthere but I believe he quit after an argument with the nasty moderator who got the administrator on his side.

audioguru · 7th March 2008, 12:52 PM

The nasty moderator over there has deleted many of my posts.
He is very quiet lately, maybe he will vanish.

The 8 years old Wise Old Man has given me hundreds of PMs all with horrible spelling.

blueroomelectronics · 7th March 2008, 01:06 PM

I delete PMs from people wanting me to do their homework for them. If a PM looks like it was OCRed from a crayon written note by an 8 yr old it goes in the bin.

Anything with more than 3 periods in a row, the bin.

What forum does he moderate?

charmer · 7th March 2008, 04:24 PM

wont battery and inverter makeup a good ups?
i only need it to provide non stop power in case power failures.

charmer · 7th March 2008, 04:35 PM

wont battery and inverter makeup a good ups?
i only need it to provide non stop power in case power failures.

I²R · 7th March 2008, 06:52 PM

Well, that's what a UPS is. You also need a charger for the battery. Even at bare minimum, I can't see you putting one together for less than the cost of a commercially-produced unit. I just bought a brand new APC 1300 kVA UPS for about $150

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3rd March 2008, 02:51 PM	(permalink)
charmer	need to build a UPS for computer Hello Friends,! I am looking forward to provide my cpu + monitor a 1hour backup when there is no electricity. As soon the power fails the UPS relay should be able to pick up the load thus not keeping the system running smoothly. When the power comes back the UPS should be able to shift back automatically. I would like to do this for my project and should be easily done in home with less expensive tools. I think what i would be needing is, 1000W rated inverter Car battries But how to make them work with the cpu? Please comment/suggest Thanks alot.

3rd March 2008, 04:57 PM	(permalink)
blueroomelectronics	Pie in the sky. You're dreaming, it'll cost you more than buying one. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

3rd March 2008, 07:57 PM	(permalink)
Kryten	why dont you just google?? Here is a couple of links: http://www.dansdata.com/diyups.htm http://www.edn.com/contents/images/41102di.pdf (for USB device but anyways) http://icrontic.com/articles/super_ups (looks to be the best) __________________ Simplicity rules Good enought - its perfect ?? 2 Gig of free online backup space Are you a Chemist?

4th March 2008, 02:07 AM	(permalink)
rjvh	same advice as the others buy one what you can do is buy a lighter model and change the batery pack your self if it is only your computer (if you have a lcd screen) a small 650W inverter would do it already for a long time you increase the baterry size your self and you have your extra time Robert-Jan

4th March 2008, 01:52 PM	(permalink)
I²R	Building a UPS from the ground up is like making a copy of Romeo and Juliet by buying magazines and cutting out the words aned pasting them to blank pages: you can do it, but it'll take a long time and you'll wind up paying way more than if you just bought it.

6th March 2008, 10:13 PM	(permalink)
audioguru	I am also a member of Electronics-Lab. I helped fix an old inverter design there that didn't work. It uses old 2N3055 transistors because Mosfets are not available in the 3rd world nor in the 4th and 5th worlds. I can buy a pretty good and cheap inverter that was made there. Those people can't buy it. __________________ Uncle $crooge

7th March 2008, 12:04 AM	(permalink)
blueroomelectronics	Audioguru you ARE electronics-lab, if you didn't post the forums ther would be an electronic wastebasket. The let wise old man be a moderator and he's like 8yrs old, maybe they'd let you moderate. Can't see why eplanet isn't a moderator? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

7th March 2008, 10:56 AM	(permalink)
Hero999	Audioguru use to be a moderator overthere but I believe he quit after an argument with the nasty moderator who got the administrator on his side. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

7th March 2008, 12:52 PM	(permalink)
audioguru	The nasty moderator over there has deleted many of my posts. He is very quiet lately, maybe he will vanish. The 8 years old Wise Old Man has given me hundreds of PMs all with horrible spelling. __________________ Uncle $crooge

7th March 2008, 01:06 PM	(permalink)
blueroomelectronics	I delete PMs from people wanting me to do their homework for them. If a PM looks like it was OCRed from a crayon written note by an 8 yr old it goes in the bin. Anything with more than 3 periods in a row, the bin. What forum does he moderate? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

7th March 2008, 04:24 PM	(permalink)
charmer	battery and inverter? wont battery and inverter makeup a good ups? i only need it to provide non stop power in case power failures. __________________ ::= Man Is In Loss =:: - http://www.BlackPapers.Info -

7th March 2008, 04:35 PM	(permalink)
charmer	battery and inverter? wont battery and inverter makeup a good ups? i only need it to provide non stop power in case power failures.

7th March 2008, 06:52 PM	(permalink)
I²R	Well, that's what a UPS is. You also need a charger for the battery. Even at bare minimum, I can't see you putting one together for less than the cost of a commercially-produced unit. I just bought a brand new APC 1300 kVA UPS for about $150