Voltage detecting circuit

Details Voltage detecting circuit Voltage detecting circuit

1977-01-28

1981-10-06

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307304, 307310, H03K 5153

Patent

active

042937825

ABSTRACT:
A voltage detecting circuit, for example for detecting the approaching exhaustion of the battery of a timepiece, hand-held calculator or other small electronic device uses a MOS transistor, the operating point of which in detecting the predetermined voltage is selected as the point at which the ratio of the current to the conductive constant of the MOS transistor is above 0.1. The temperature compensation thereby achieved is good enough that the measured value almost coincides with the design value without the need of using a variable resistor.

REFERENCES:
patent: 3628070 (1971-12-01), Heuner et al.
patent: 3917960 (1975-11-01), Kane
patent: 3949545 (1976-04-01), Chihara

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