Apparatus and methods for UPS bypass monitoring and control

Details Apparatus and methods for UPS bypass monitoring and control Apparatus and methods for UPS bypass monitoring and control

2004-06-23

2008-07-15

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

One source floats across or compensates for other source

C361S078000

Reexamination Certificate

active

07400066

ABSTRACT:
Status of a bypass source of parallel-connected UPSs is determined from a load share when a loading of the parallel-connected UPSs meets a predetermined criterion. Status of a bypass source of the parallel-connected UPSs is determined from a bypass source voltage when the loading of the parallel-connected UPSs fails to meet the predetermined criterion. The loading may include an aggregate loading, and failure of a bypass source of a UPS may be identified responsive to detecting that a load share of the UPS is less than a predetermined proportion of the aggregate loading. Alternatively, failure of the bypass source may be identified by detecting that a bypass voltage fails to meet a predetermined criterion. Bypass circuits of the UPSs may be controlled responsive to a load share and/or a bypass source voltage.

REFERENCES:
patent: 6191500 (2001-02-01), Toy
patent: 6201319 (2001-03-01), Simonelli et al.
patent: 2002/0043859 (2002-04-01), Smith
patent: 2005/0036253 (2005-02-01), Tian et al.
patent: 2005/0043859 (2005-02-01), Tsai et al.

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