Control system, method and product for uninterruptible power...

Details Control system, method and product for uninterruptible power... Control system, method and product for uninterruptible power...

2005-03-31

2008-11-25

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

C307S043000, C307S066000, C307S051000

Reexamination Certificate

active

07456520

ABSTRACT:
A method for controlling an uninterruptible power supply (UPS) for servicing a load is disclosed. The UPS has a bypass feed path operable in parallel with an inverter feed path, the bypass feed path being engagable with the load via a first switch, and the inverter feed path and being engagable with the load via a second switch. The method includes: generating a paralleling detection signal indicative of the bypass feed path operating to service the load in parallel with the inverter feed path; and, in response to the presence of the paralleling detection signal, modifying a control signal to an inverter such as to drive toward equalization the bypass current and the inverter current. As a result, and in response to the two paths operating to service the load in parallel, the method tends to cancel circulation current generated between the bypass feed path and the inverter feed path.

REFERENCES:
patent: 5612580 (1997-03-01), Janonis et al.
patent: 6917124 (2005-07-01), Shetler et al.
patent: 6917271 (2005-07-01), Zhang et al.
patent: 2005/0063115 (2005-03-01), Nayar et al.
patent: 2005/0073783 (2005-04-01), Luo et al.
patent: 2006/0164782 (2006-07-01), Colombi et al.

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