Real-time clock back-up battery

Details Real-time clock back-up battery Real-time clock back-up battery

1999-02-03

2000-01-18

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

320DIG26, 180 685, 307 91, 307 66, H02J 700, B60R 1604, B60L 100

Patent

active

060160454

ABSTRACT:
A back-up battery system is provided for use with a real-time clock of an on-board device controller. In its normal operation, the real-time clock (RTC) is powered by a primary power source, such as a vehicle battery. When the primary source is interrupted, the back-up battery system is invoked to provide back-up power to the RTC. The system includes a low voltage dry cell battery mounted within a fuse component configured for electrical engagement within the vehicle fuse block. In one embodiment, a relay is interposed between the fuse component and the RTC to make and break the back-up power circuit in response to the state of the primary power source. In another embodiment, the battery within the fuse component is replaceable, with the fuse component including a base and a removable cap. In still another embodiment, the battery within the fuse component is a rechargeable battery, and the back-up power system includes a recharging circuit operable with the primary power source.

REFERENCES:
patent: 4672228 (1987-06-01), Swoboda
patent: 4925750 (1990-05-01), Theiss
patent: 5077572 (1991-12-01), Morisawa
patent: 5191500 (1993-03-01), Hatano et al.
patent: 5204610 (1993-04-01), Pierson et al.
patent: 5358798 (1994-10-01), Kleinert, III et al.
patent: 5529142 (1996-06-01), Burke, III
patent: 5569997 (1996-10-01), Berger

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