US 11,909,258 B2
Method to detect back-feed and mis-wiring events by a UPS system
Kenneth A. Colby, Jr., Hollis, NH (US); Wei-Hsiang Lin, Shanghai (CN); Venkatraman Chennakesavan, Groton, MA (US); Eyob Demissie, Westford, MA (US); Luka Petrovic, North Billerica, MA (US); Himamshu V Prasad, Tewksbury, MA (US); and Yu Zhang, Shanghai (CN)
Assigned to SCHNEIDER ELECTRIC IT CORPORATION, Foxboro, MA (US)
Filed by SCHNEIDER ELECTRIC IT CORPORATION, Foxboro, MA (US)
Filed on Mar. 18, 2022, as Appl. No. 17/655,474.
Claims priority of provisional application 63/164,190, filed on Mar. 22, 2021.
Prior Publication US 2022/0302747 A1, Sep. 22, 2022
Int. Cl. H02J 9/06 (2006.01); H01H 47/00 (2006.01); H02M 5/42 (2006.01)
CPC H02J 9/062 (2013.01) [H01H 47/002 (2013.01); H02M 5/42 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A power supply comprising:
an input configured to receive input AC power;
an output configured to provide output AC power to a load;
at least one power converter coupled to the input and configured to convert the input AC power into the output AC power; and
a controller coupled the at least one power converter, the controller being configured to:
adjust at least one parameter of the output AC power provided by the at least one power converter,
detect, in response to adjusting the at least one parameter of the output AC power, at least one of an adjusted input AC power or an adjusted output AC power, and
determine that a fault has occurred based on the at least one of the adjusted input AC power or the adjusted output AC power, wherein the fault provides an indication that contacts of at least one relay included in the power supply are welded or shorted together.