Method and apparatus for connection and disconnection of batteries to uninterruptible power systems and the like
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Dec 19, 1994
filing date -
Dec 19, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Connection of batteries to the DC bus lines across which capacitors are connected in power systems, such as uninterruptible power systems, is carried out using an auxiliary switch which is controlled to connect the batteries to a DC bus line through a precharge resistor momentarily before connection is made through a main connector. The preconnection of the batteries through the precharge resistor provides a controlled rate of charge of the capacitors before closing of the main connector to thereby avoid excessive surge currents. When the main connector is opened, as when the power system is prepared for transportation or long term storage, the auxiliary switch interrupts the current path from the battery through the precharge resistor and provides a current path from the DC bus line through a discharge resistor to ground to bleed down the charge on the capacitors to a desired level within a selected period of time.
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