| US 7,508,094 B2 | ||
| UPS systems having multiple operation modes and methods of operating same | ||
| Robert W. Johnson, Jr., Raleigh, N.C. (US); Rune Lennart Jonsson, Raleigh, N.C. (US); Ove Ohman, Espoo (Finland); Joseph Charles Paulakonis, Chapel Hill, N.C. (US); Kevin Lee, Menomonee Falls, Wis. (US); and Pasi Sakari Taimela, Raleigh, N.C. (US) | ||
| Assigned to Eaton Corporation, Cleveland, Ohio (US) | ||
| Filed on Mar. 17, 2006, as Appl. No. 11/378,200. | ||
| Prior Publication US 2007/0216228 A1, Sep. 20, 2007 | ||
| Int. Cl. H02J 9/00 (2006.01) | ||
| U.S. Cl. 307—64 | 2 Claims |
| 1. A power supply system comprising:
an AC input configured to be coupled to an AC source;
an AC output configured to be coupled to a load;
a UPS having an input coupled to the AC input and an output coupled to the AC output, wherein the UPS comprises a rectifier
having an input coupled to the AC input, an inverter having an output coupled to the AC output, a DC link coupling an output
of the rectifier to an input of the inverter, and a battery coupled to the DC link;
a bypass circuit coupled between the AC input and the AC output and configured to open and close a bypass path therebetween;
and
a controller configured to control the UPS and the bypass circuit such that the UPS operates as an online UPS for a first
input voltage magnitude condition at the AC input and as a standby UPS for a second input voltage magnitude condition at the
AC input, wherein the controller is configured to operate the UPS as an online UPS by transferring power from the AC input
to the AC output via the rectifier and the inverter in a first online UPS operation state and transferring power from the
battery to the AC output via the inverter in a second online UPS operation state, and wherein the controller is configured
to operate the UPS as a standby UPS by transferring power from the AC input to the AC output via the bypass circuit in a first
standby UPS operation state and transferring power from the battery to the AC output via the inverter in a second standby
UPS operation state.
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