What mains voltage do you have? What do you want to charge? Without more information it's impossible to design a practical charger. There's no such thing as a truly universal charger.
What mains voltage do you have? What do you want to charge? Without more information it's impossible to design a practical charger. There's no such thing as a truly universal charger.
Is this for domestic, commercial, .......industrial or military use? Is the UPS for an intruder alarm, a PC, an office block, a hospital, an aircraft carrier ...... ? Give us a clue !!!!