????? ??? ??? ?? ?? ???? ????? ?????? ??? ????? ??? ??? ?????? ?????? ???? ? ?? ??? ??? ???? ??? ? ??? ??? ????.??? ???? ?? ?????????? ????? ???? ?????? ?????????? ????? ?? ?? ???? ????? ???? ? ????? ??????? ? ?????? ??? ??? ??? ???????? ?????? ?? ???????? ???? ?????????.???? ???? ??????? ???? ???????? ???? ???????? ?? ?? ??? ??? ????? ??? ????? ??

?????? ??????? ?? ????? ???? ???? ?? ?????? ???? ???? ???????? ?? ??????? ?????????? ?? ???? ??????.An on-line UPS works by using a "double conversion" approach to accepting AC enter, rectifying to DC for passing through the rechargeable battery (or battery strings), then inverting back to one hundred twenty V/230 V AC for powering the secured eq