The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2018
Filed:
Jan. 05, 2012
Daniel Rozand, Romans sur Isere, FR;
Patrick Chambon, Saint Martin d'Heres, FR;
Stefano DE Cesaris, Grenoble, FR;
Daniel Rozand, Romans sur Isere, FR;
Patrick Chambon, Saint Martin d'Heres, FR;
Stefano De Cesaris, Grenoble, FR;
SCHNEIDER ELECTRIC IT CORPORATION, West Kingston, RI (US);
Abstract
An uninterruptible power supply (UPS) system () comprises a plurality of UPS units (UPS-1, UPS-2) connected in parallel. Each UPS unit comprises a power converter () for supplying a share (i load 1, i_load_2) of a total load current (i_tot). The total load is shared automatically between UPS units of power ratings, in a proportionate manner. A controllerof each converter is arranged to establish real-time feedback control of a current supplied by the power converter. An exchange current (i_exch) for each converter represents an imbalance between an output current of the converter in question and output currents of the parallel converters. Exchange current sensing circuits of the parallel-connected UPS units are connected together. The controller steers the exchange current of each converter toward a value (i_exc_c) that is a non-zero proportion of a current (i_mut) sensed within the converter. Said non-zero proportion is calculated such that the exchange current will be steered towards a positive value in the case of a converter with higher than average nominal power rating and toward a negative value in the case of a converter with lower than average power rating.