Electronic timepiece battery-potential detecting circuit

Details Electronic timepiece battery-potential detecting circuit Electronic timepiece battery-potential detecting circuit

1975-09-02

1977-08-23

Jackmon, E. S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340249, G04C 300, G08B 2100

Patent

active

040431100

ABSTRACT:
An electronic timepiece battery-potential detecting circuit unaffected by temperature changes is provided. An electronic timepiece includes a DC power source such as a battery for providing an effective potential for energizing the timekeeping circuitry and display thereof. An electronic switching element is provided for detecting the effective potential of the DC power source. The electronic switching element includes a first electrode coupled to the power source for detecting the effective potential thereof, and two further electrodes defining a closed current path in response to the control electrode being referenced above a predetermined potential, the two further electrodes defining an open current path in response to the potential detected by the control electrode dropping to the predetermined potential, at least one of the further electrodes having a current temperature coefficient of substantially zero when the effective potential of the DC power source is above the predetermined potential.

REFERENCES:
patent: 3383522 (1968-05-01), Apfelbeck et al.
patent: 3898790 (1975-08-01), Takamune
patent: 3912977 (1975-10-01), Fillmore
patent: 3916262 (1975-10-01), Easter
patent: 3991553 (1976-11-01), Bergey et al.
patent: 3993985 (1976-11-01), Chopard

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