System for detecting the end useful life of a battery in an elec

Details System for detecting the end useful life of a battery in an elec System for detecting the end useful life of a battery in an elec

1978-12-21

1980-08-12

Jackmon, Edith S.

Horology: time measuring systems or devices

Chronological

With power monitor

340636, G04C 300, G08B 2100

Patent

active

042166489

ABSTRACT:
The invention concerns an electronic timepiece including a system for detecting the end of useful battery life. This system is based on a circuit for detecting the length of the driving pulses for the stepping motor, associated with a circuit for shortening the driving pulses. The detector circuit comprises two counters, the output logic levels of which coincide when the voltage of the battery has dropped to a value such that the stepping motor is at its limit of operation, in which case the duration of the driving pulses is at a maximum.

REFERENCES:
patent: 4028880 (1977-06-01), Ueda
patent: 4163193 (1979-07-01), Kamiya

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