Real time solid state register having battery backup

Details Real time solid state register having battery backup Real time solid state register having battery backup

1991-01-14

1993-06-01

Baker, Stephen M.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

364483, 365229, G01R 2200, G06F 1216

Patent

active

052163571

ABSTRACT:
A microprocessor based time-of-use electricity meter register uses an external real time clock powered by a backup battery during a power outage to measure real time elapsed during the outage. Upon detection of a power outage, line power and real time data are transferred by the microprocessor to an external, non-volatile memory, the external real time clock is energized by the backup battery and the clock reset to accumulate elapsed real time (days, hours, minutes, seconds) during the duration of the outage. Upon resumption of line power, the elapsed real time accumulated by the clock and the content of the non-volatile memory are transferred to the microprocessor, the backup battery is disconnected from the external real time clock and the real time previously stored in the nonvolatile memory is updated by the elapsed real time so that no customer billing data are lost during the outage.

REFERENCES:
patent: 4197582 (1980-04-01), Johnston et al.
patent: 4467434 (1984-08-01), Hurley et al.
patent: 4509128 (1985-04-01), Coppola et al.
patent: 4594545 (1986-06-01), Germer

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