Battery switch for ram backup

Details Battery switch for ram backup Battery switch for ram backup

1994-04-29

1996-07-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

320 5, 320 9, 365229, 307 66, H02J 900

Patent

active

055326765

ABSTRACT:
A charging circuit for a random access memory (RAM) backup battery for supplying a first charge current from a voltage supply to the battery for as long as the voltage supply is present, comprised of a first resistance apparatus for limiting the first charge current to a low predetermined value, a bypass conducting switch connected in parallel with the first resistance apparatus, and apparatus for detecting a low voltage condition of the voltage supply and for enabling operation of the bypass conducting switch thereby bypassing the first resistance apparatus and allowing discharge current to flow from the battery to the RAM.

REFERENCES:
patent: 4672293 (1987-06-01), Crampton
patent: 5007027 (1991-04-01), Shimoi
patent: 5241508 (1993-08-01), Berenguel et al.
patent: 5278798 (1994-01-01), Miyawaki

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