Automatic control means providing a low-power responsive signal,

Details Automatic control means providing a low-power responsive signal, Automatic control means providing a low-power responsive signal,

1987-10-06

1989-07-04

Beha, Jr., William H.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 2, 323303, H02J 704

Patent

active

048454192

ABSTRACT:
In a system including volatile memory, a battery backed memory may be available for preserving data in the event of a power failure. Low power condition is reliably sensed sufficiently in advance of supply voltage falling below a minimum operating voltage range so as to give an adequate time interval, e.g. 2.5 milliseconds for the saving of application operating system status. By using a voltage regulator signal which switches in a particularly sensitive manner toward a saturation or zero state well outside its normal control range to trigger a low power signal, such low power signal may provide a time interval of, e.g. from three to six milliseconds of advance warning of impending supply voltage failure. The system is particularly useful for hand-held data processing systems with rechargeable batteries since the regulator may provide its regulator signal as a common control signal for regulating multiple supply paths, and may only trigger the low power signal when all of such supply paths approach a failure condition.

REFERENCES:
patent: 3754182 (1973-08-01), Morris et al.
patent: 4308492 (1981-12-01), Mori et al.
patent: 4455523 (1984-06-01), Koenck
patent: 4494064 (1985-01-01), Hookness
patent: 4553081 (1985-11-01), Koenck
patent: 4716354 (1987-12-01), Hacker

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