Self-chargeable electronic timepiece with operating voltage chec

Details Self-chargeable electronic timepiece with operating voltage chec Self-chargeable electronic timepiece with operating voltage chec

1987-04-06

1988-11-15

Roskoski, Bernard

Horology: time measuring systems or devices

Power supply details

Electrical

G04B 300

Patent

active

047854359

ABSTRACT:
A self-chargeable timepiece includes a pair of small and large capacitors having respective small and large capacities and selectively disconnectably connected at their respective terminals to time-keeping circuitry and a solar cell. The pair of small and large capacitors cooperate with each other during the momentary operation of the solar cell for selectively receiving and storing the electric charge to develop respective terminal voltages across their respective terminals even after the momentary operation of the solar cell. A detector periodically detects the terminal voltages of the small and large capacitors during the time-keeping operation. A switching circuit responds to the detected terminal voltages for selectively connecting and disconnecting the small and large capacitors to and from the time-keeping circuitry to enable the small and large capacitors to selectively power the time-keeping circuitry. A regulating circuit operates when the time-keeping circuitry is powered by the small capacitor for regulating the detector to effect the periodical detection of the terminal voltages at relatively short time intervals and operates when the time-keeping circuit is powered by the large capacitor for regulating the detector to effect the periodical detection of the terminal voltages at relatively long time intervals.

REFERENCES:
patent: 4702613 (1987-10-01), Ohtawa
Congres International de Chronometrie, Besancon, 4-6, Oct. 1984, vol. 1, Congres 11, pp. 75-79, Takehide Yamada "No Battery Analog Quartz Watch".

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