Electronic timepiece battery potential detecting circuitry

Details Electronic timepiece battery potential detecting circuitry Electronic timepiece battery potential detecting circuitry

1975-09-24

1977-07-26

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

040373991

ABSTRACT:
An electronic timepiece battery-potential detecting circuit uneffected by temperature changes is provided. The electronic timepiece includes a D.C. power source such as a battery for providing an effective potential for energizing the timekeeping circuitry and display thereof. An electronic switching circuit is provided for detecting the effective potential of the D.C. power source. The electronic switching circuit includes a first stage switching element having a control electrode coupled to the power source for detecting the effective potential thereof, and two further electrodes defining a closed current path having either a first positive or negative current temperature coefficient in response to the control electrode being referenced above a predetermined potential, the two further electrodes defining a closed current path in response to the potential detected by the control electrode being above a predetermined potential, and a second stage switching element having a control electrode coupled to one of the first stage element further electrodes for detecting the potential thereof, the second stage element including further electrodes defining a closed current path having either a positive or negative current temperature coefficient opposite from the first stage element in response to the second stage element control electrode being referenced below the predetermined potential, the two further electrodes of the second stage element defining a closed current path.

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

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