UPS systems having multiple operation modes and methods of operating same

摘要

A power supply system (100) includes an AC input (Va,Vb,Vc) configured to be coupled to an AC source, an AC output (Va,Vb,Vc') configured to be coupled to a load, a UPS (101) having an input coupled to the AC input (Va,Vb,Vc) and an output coupled to the AC output (Va,Vb,Vc') and a bypass circuit (160) coupled between the AC input (Va,Vb,Vc) and the AC output (Va,Vb,Vc') and configured to open and close a bypass path therebetween. The system further includes a controller (180) configured to control the UPS and the bypass circuit (160) such that the UPS (101) operates as an online UPS for a first input voltage magnitude condition at the AC input (Va,Vb,Vc) and as a standby UPS for a second input voltage magnitude condition at the AC input (Va,Vb,Vc). A multi-mode converter may be coupled to a DC link (112a,112b) of the UPS and configured to be selectively coupled to a battery (170) and the AC input (Va,Vb,Vc) to respectively support battery conversion and current control at the AC input (Va,Vb,Vc) in respective first and second modes of operation of the UPS (101).