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Software Controller Back-Up Battery Recharge Disclosure Number: IPCOM000040014D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

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Sawdon, D [+details]


In equipment where a rechargeable battery backs up volatile memory or realtime clock when mains power is absent, the charge rate is selected by software when mains power returns. The charge-discharge history of the battery is stored so that the optimum charge rate may be selected, the user warned that the battery charge is low or that the battery should be replaced. Equipment which uses a rechargeable battery to back-up memory or realtime clock functions while the mains power is not present naturally requires that the battery is recharged during times when the mains power is present. Some market areas have unpredictable on/off power cycles; it is therefore difficult to guarantee that the battery will always be correctly recharged ...