Timekeeping apparatus with power line dropout provisions

Details Timekeeping apparatus with power line dropout provisions Timekeeping apparatus with power line dropout provisions

1977-04-29

1978-07-11

Schaefer, Robert K.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

58 23R, 58152R, 307 64, 340663, G04C 1700, H02J 900

Patent

active

040993728

ABSTRACT:
In a timekeeping arrangement, including seconds, minutes and hours counters and associated display decoding circuitry, during temporary power line dropouts, the supply voltage for the hours and minutes counters is maintained by an associated voltage storage capacitor so that their contents are retained, and, upon the return of line power, the seconds counter is set to a number corresponding to 30 seconds. In this manner, over a number of random temporary power dropouts, the accuracy of the timekeeping arrangement is maintained without the need of readjustment or the use of auxiliary systems powered by standby power sources.

REFERENCES:
patent: 3608301 (1971-09-01), Loewengart
patent: 3626686 (1971-12-01), Harris
patent: 3898644 (1975-08-01), Baxter
patent: 3922588 (1975-11-01), Kunzel
patent: 3955352 (1976-05-01), Berney

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