Uninterruptible power supply with plurality of inverters

H - Electricity – 02 – M

Patent

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Details

H02M 7/493 (2007.01) H02J 9/06 (2006.01)

Patent

CA 2350486

An uninterruptible power system (10) in which separate inverters (A, B, C) are connected to separate d.c. power sources (16, 42, 64) established by independent power supplies, a.c., d.c. or both, and have their a.c. outputs connected to separate transformer primary windings (36, 62, 86) with the primary to secondary turns ratios of the primary windings establishing different effective secondary voltages for determining the power source for normally supplying the power from the system (10) and the sequence in which the other power sources are used on power failure, the magnitudes of the effective voltages determining the power source for initially supplying the power with any other power source supplying the power when its effective voltage is higher than any other available power source.

Système électrique (10) ne pouvant être interrompu, dans lequel des onduleurs séparés (A, B, C) sont connectés à des sources de courant continu séparées (16, 42, 64) établies par des alimentations électriques indépendantes, en courant continu, en courant alternatif ou les deux. Les sorties en courant alternatif desdits onduleurs sont connectées à des bobinages primaires (36, 62, 86) de transformateur séparés, les rapports des nombres de spires primaires et secondaires des bobinages primaires établissant des tensions secondaires effectives différentes pour déterminer la source électrique destinée à fournir normalement de l'électricité en provenance du système (10) et la séquence dans laquelle les autres sources électriques sont utilisées en cas de défaillance. Les grandeurs des tensions effectives déterminent la source électrique destinée à l'alimentation électrique initiale, toute autre source électrique assurant l'alimentation électrique lorsque sa tension effective est supérieure à celle de toute autre source électrique disponible.

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