Auxiliary power supply system for providing dc power on demand

H - Electricity – 02 – J

Patent

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H02J 9/00 (2006.01) H02J 9/08 (2006.01)

Patent

CA 2103582

2103582 9214292 PCTABS00014 An auxiliary power supply system includes an internal combustion engine (60) driving an alternator (90) the outputs (63) being rectified (64) and supplied on demand to DC bus lines (43, 44) across which a storage battery (45) is connected. The DC bus line (43, 44) supply a consuming device such as an uninterruptible power supply (47). The voltage across the bus lines (43, 44) is sensed and when the voltage drops below a selected value, indicating that the consuming device (47) is drawing power from the battery (45) beyond a desired limit, the engine (60) is turned on for a period of time, during which the power from the generator (62) is not supplied to the DC bus lines (43, 44). Thereafter, the generator (62) supplies power to the DC bus lines (43, 44) to supply the consuming device (47) and partially recharge the battery (45) until the consuming device (47) is no longer drawing power, after which the engine (60) is shut off. The operating characteristics of the engine (60) and generator (62) are sensed and stored for access by an operator and warnings are provided if these conditions exceed acceptable limits.

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