Uninterruptible power supply having improved battery charger
Patent 5185536 Issued on February 9, 1993. Estimated Expiration Date: 
September 27, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 27, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesUninterruptible power supply with battery back-up AC Uninterruptible power system Power supply with battery backup Patent #: 4694194 InventorsAssigneeApplicationNo. 766762 filed on 09/27/1991US Classes:307/66, Storage battery or accumulator307/64, Substitute or emergency source363/37By semiconductor rectifier and inverterExaminersPrimary: Voeltz, Emanuel T.Attorney, Agent or FirmInternational ClassH02J 007/02AbstractAn UPS apparatus with a back-up battery and successively coupled rectifier, inverter and output filter circuits, having an improved battery charging circuit. The charging circuit has a transformer with its primary winding being part of the output filter, and its secondary winding driving a second rectifier circuit which produces the charging current. The charging circuit contains an impedance preferably connected between the transformer secondary winding and the second rectifier circuit, for capturing only a high frequency portion of the signal from the inverter stage, thereby enabling the utilization of smaller charger circuit elements.Other References
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