Thread: Need a circuit diagram of a UPS

Can someone help me with a simple circuit of an ups? It should have a 5 minutes backup and all parts should be available in the market.
JUST A SIMPLE CIRCUIT.
Is there anyone?
Please write me at upol@glinktel.com for any assisstance.
regards
upol :D

Originally Posted by upol

Can someone help me with a simple circuit of an ups? It should have a 5 minutes backup and all parts should be available in the market.
JUST A SIMPLE CIRCUIT.
Is there anyone?
Please write me at upol@glinktel.com for any assisstance.
regards
upol :D

You can find reference design at the microchip's web site.

http://www.microchip.com/1000/suppdo...ref1/index.htm

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thanks to you

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This design from Microchip it's not simple is a sine wave output type
with many special and costly parts, and many stages.

For a simple type low cost the square wave output with output filter
is a good approach, for best results has to be online type UPS.

Tornado

Originally Posted by Tornado

This design from Microchip it's not simple is a sine wave output type
with many special and costly parts, and many stages.

For a simple type low cost the square wave output with output filter
is a good approach, for best results has to be online type UPS.

Tornado

ya i agree with u.
Do u have any personal suggession?
thanks

Let's start with the requirements:

Output Power
Battery Voltage
Output Voltage
Output Frequency
5 minutes of time

First you have to define those.

Regards

Ok ...Here it goes..
1:::OUTPUT POWER ---- ~500VA
2:::Battery Voltage----- 12V (7AHr) x 2pcs (Parallel connection to increase power and backup time)
3:::OUTPUT Voltage---- ~230VAC
4:::OUTPUT Frequency-- 50HZ(tolerance 2%)

Here are the requirement...now u can proceed to the next lesson
thanks to u very much

Hi Upol please take a look at this:
http://www.elektroda.pl/eboard/viewt...=232826#232826

ITP is asking for a UPS with exact same requirements, so I suggest to
move to one topic so we can assist you both in the design of that UPS,
it seems to me like a school project.
Is it? In this case we have to help you guys with 2 different
designs, yes that's possible by using different ferrite tranformers and
drive circuits.

Regards
Tornado

Hi Upol, can you check in your area for a 500VA transformer with 2x12Volt primary windings that has to be the first close to the core, normal transformers don't work properly because the primary 230 Vac winding is wounded close to the core and secondary is the last winding on top of the primary.

I work some code for the output section.

Tornado

yes...I have a transformer like u described..But one thing...I got a transformer...which's half of the core is for primary and the other half is for the secondary. In such arrangement both the windings have the same distance from the iron core. Will these sort of transformer work?

OK that transformer is even better!!!

Upol, here is a topic link for UPS on Elektroda you can
watch and post from now on there so we and I dont have
to jump from topic to topic.

http://www.elektroda.pl/eboard/viewtopic.php?t=60335

Also Richmond74 posted a very good link for a ups:

http://www.technology.niagarac.on.ca...mcsele/i2k.htm

Tornado