UNINTERRUPTIBLE POWER SUPPLY SYSTEM

The invention relates to an uninterruptible power supply system, comprising at least one AC input terminal (3); an AC output terminal (2) and an DC input terminal (4); at least one uninterruptible power supply, UPS, device (1, N), comprising a DC link (7), a DC/AC converter (9) connecting on a first side to the DC link (7) and on a second side to the AC output terminal (2), and a DC/DC converter (11) connecting on a first side to the DC input terminal (4) and on second side to the DC link (7); and at least two switches (8) and at least one coupled differential mode inductor (12) having two windings (10), whereby each switch (8) is connected in series with at least one winding (10) forming a series connection (6), and the series connection (6) is connected on a first side to the at least one AC input terminal (3) and on a second side to the AC output terminal (2). 本发明涉及一种不间断电源系统，所述不间断电源系统包括：至少一个AC输入端子（3）；AC输出端子（2）和DC输入端子（4）；至少一个不间断电源UPS装置（1，N），所述至少一个不间断电源UPS装置（1，N）包括DC链路（7）、在第一侧上连接到所述DC链路（7）以及在第二侧上连接到AC输出端子（2）