in this video I expained about UPS trans former, UPS transformer is battery mode when AC supply not present that it works as step up transfomer which convert DC 12 voltage to AC 220 volt secondary side of transformer. in AC mode it works as a auto transformer. secondary side different type of trapping windings 160 v, 190 v, 250 v and 220 v. 220 v is contant out to UPS socket, in UPS AVR (automatic voltage regulator) section sense how much voltage is coming from input, if AC input getting arround 160 v , then AVR section automatic connect to 160 v voltage tapping of transformer, the output voltage would constant 220 voltage only.
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