Automatic load shed control for spacecraft power system
May 10, 2003. 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 References 3600599 3617850 3740636 Battery testing apparatus Device for controlling the charging and discharging of a storage battery Method of controlling the recharging of storage cells, and monitoring their state of charge Redundant battery protection system Method and device for monitoring the state of charge of a storage battery Video preamplifier for laser systems Electrical charging and discharging control apparatus and method, and solar to electrical energy conversion apparatus incorporating such apparatus Patent #: 4383211 InventorsAssigneeApplicationNo. 06/493227 filed on 05/10/1983US Classes:324/427, To determine ampere-hour charge capacity307/39, Condition responsive320/136, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)323/906SOLAR CELL SYSTEMSExaminersPrimary: Karlsen, Ernest F.Assistant: O'Shea, Kevin D. Attorney, Agent or FirmInternational ClassesG01R 31/36 (20060101)H02J 7/00 (20060101) H02J 7/35 (20060101) H02J 7/34 (20060101) H02J 1/14 (20060101) AbstractAn automatic load shed control for a spacecraft power system employs a selectable one of a plurality of charging gains to approximate a state of charge in a secondary battery system. An ampere hour meter is initialized when the battery system is known to be fully charged and the inefficiencies of the charging system are lumped into a charging gain parameter. An output of the ampere hour meter is compared with a load shed threshold to determine the time for load shedding. The charging gain can be remotely changed as required to a value which causes the output of the ampere hour meter to track the true state of charge of the battery system closely enough for system satisfactory operation of load shedding. The charging gain may be a constant or may be a variable in dependence on the state of charge of the battery system. Charge which is delivered at a rate below a predetermined threshold is ignored by the ampere hour meter.Other References
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