Electricity: battery or capacitor charging or discharging – Diverse charging or discharging rates for plural batteries
Reexamination Certificate
2001-02-20
2004-03-02
Tso, Edward H. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Diverse charging or discharging rates for plural batteries
Reexamination Certificate
active
06700351
ABSTRACT:
STATEMENT REGARDING FEDERALLY-FUNDED RESEARCH
Not Applicable
REFERENCES
Not Applicable
BACKGROUND OF THE INVENTION
The present invention relates to the field of uninterruptible power supplies. More particularly, the invention is a modular UPS which provides numerous advantages over prior art UPS systems. Among the advantages provided are scalability, redundancy, and ease of maintenance by the end user.
BRIEF SUMMARY OF THE INVENTION
The modular UPS of the present invention includes numerous novel features not found in prior art devices. The modular design is facilitated by modules that make up the UPS that can be installed in various locations in the frame. Flexible location in the frame is enabled by a novel connector, which also provides the capability for the user to service the equipment by replacing modules without being exposed to hazardous conditions. Use of multiple modules is facilitated by a novel current sharing system between various power modules. Novel battery module intelligence is provided that enables or enhances various battery performance aspects as well as extends battery life and decreases the risk of cascading battery damage. Improved battery capacity and run time determination methods are also provided that result in more accurate determination of run time available, enabling the operator to shut down critical equipment before load power is terminated by the exhaustion of battery power. Also provided is a novel technique for switching the UPS to bypass power in the event of a failure, which provides increased reliability by eliminating semiconductor components that are a frequent source of failure in prior art UPS systems. Another aspect of the invention is a novel shipping pallet that provides both additional structural rigidity and a simplified means for unloading and reloading the unit.
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News Release from McKinney Advertising & Public Relations,New Liebert System Optimizes Scalability/Redundancy Features For Mission-Critical Applications; Jan. 30, 2000, 3 pages.
38thMidwest Symposium on Circuits and Systems,A Control Method For High Power UPSs in Parallel Operation; A. Pina Martins, et al., 1996, pp. 208-211.
Birchmeier John R.
Blair Charles F.
Crawford Christopher
Gabel Mark
Reinbolt Brad
Howrey Simon Arnold & White , LLP
Liebert Corporation
Tso Edward H.
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