computer restart problem with local ups

[javed]

Hi Friends,
I have a problem with my local made ups which restarts the computer when the load is shifted on ups (when electricity is not available).
how to increase the switching speed? the main relay is of 12vdc?

thanks

Javed

 

[kabiru]

What method did you used to swich back to ups when their is power failure? Can you upload your circute diagram.

 

[javed]

hi kabiru.

i have used transformer (220v 12v), then bridge for dc which drives the 12v relay.

 

[kabiru]

On a normal ups, the shut down pin of your oscilator is used to control the ups when their is power supply and when ever their is power failure the ups automaticaly swich on,i dont know what oscilator do you used for your desinge.