US 11,056,908 B2
Uninterruptible power supply systems and methods using isolated interface for variably available power source
Robert William Johnson, Jr., Raleigh, NC (US); Yu Liu, Milwaukee, WI (US); Bobby L. Compton, Raleigh, NC (US); Pasi S. Taimela, Wake Forest, NC (US); and Robert C. Sebald, Raleigh, NC (US)
Assigned to Eaton Intelligent Power Limited
Filed by Eaton Intelligent Power Limited, Dublin (IE)
Filed on Feb. 4, 2019, as Appl. No. 16/266,190.
Application 16/266,190 is a continuation of application No. 15/271,709, filed on Sep. 21, 2016, granted, now 10,199,858.
Application 15/271,709 is a continuation of application No. 13/297,477, filed on Nov. 16, 2011, abandoned.
Application 13/297,477 is a continuation in part of application No. 12/779,522, filed on May 13, 2010, abandoned.
Prior Publication US 2020/0006978 A1, Jan. 2, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 9/06 (2006.01); H02J 3/38 (2006.01); H02J 7/00 (2006.01)
CPC H02J 9/061 (2013.01) [H02J 3/382 (2013.01); H02J 3/383 (2013.01); H02J 3/386 (2013.01); H02J 7/007 (2013.01); H02J 9/062 (2013.01); Y02B 10/70 (2013.01); Y02E 10/56 (2013.01); Y02E 10/76 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A system, comprising:
a first uninterruptible power supply (UPS) configured to selectively couple a load to a first power source and a second power source;
a second UPS comprising a converter circuit configured to be coupled to the load in parallel with the first UPS and to selectively provide power to the load from a third power source and a fourth power source; and
a control circuit configured to control the first UPS and the converter circuit to transfer power from the third power source to the first power source via a power transfer path including the converter circuit and the first UPS.