Method and device for providing battery polarity protection for uninterruptible power supply
OwnerSivamani Sudhakar KUKUNURIinventor
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Abstract
An apparatus for determining a correct connection of a three-wire battery bank to a UPS is disclosed. The apparatus comprises a sensing printed circuit board receiving a voltage from the battery bank and providing an output of a known value when a correct connection between the battery bank and the UPS is determined, a coil receiving the output from the sensing board and a contactor comprising a plurality of switches, at least one switch for each of the wires, which are closed when the voltage applied to the coil is of a known value.
Claims12
An apparatus for determining a correct connection of a three-wire battery bank to a UPS, said apparatus comprising;
- a sensing printed circuit board receiving a voltage from said battery bank and providing an output of a known value when a correct connection between said battery bank and said UPS is determined;
- a coil receiving said output from said sensing board;
- and
- a contactor comprising a plurality of switches, at least one switch for each of said wires, which are closed when said voltage applied to said coil is of a known value.
A sensing circuit comprising:
- a plurality of terminals receiving a first voltage therebetween;
- a diode, at least one resistor and a relay in series with said plurality of terminals, wherein said diode is forward biased when a polarity of said voltage applied to said plurality of terminal is a desired polarity, a known voltage drop occurs across said at least one resistor and said relay is energized when a difference between said received voltage and said voltage drop across said at least one resistor is comparable to a rating of said relay, and
- a switching unit responsive to the energized relay provides a nominal voltage to a plurality of output terminals.
Dependencies are inferred from the claim text.