Sunday, 24 July 2016

UPS 12V power switching


I was trying to make a sort of UPS circuit with a 12V DC 5Ah power supply and a 12V 5Ah seal-lead battery.


My question is that I don't know how to switch quickly from line supply to battery. I've tried a relay but while switching, power goes down and then up.



The load on this line consists of a microcontroller and an LCD display (1Ah 5V DC). What can I use instead of the relay?


Here is the schematic:


ups 12v




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