Voltage level detecting circuit

Details Voltage level detecting circuit Voltage level detecting circuit

1981-05-20

1984-01-03

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307296R, 307355, 307360, 307363, H03K 524, H03K 5153

Patent

active

044244576

ABSTRACT:
A voltage level detector circuit, which enables an input voltage to be compared with a predetermined stable reference level, defined on the basis of the sum of a first value of the direct voltage across the terminals of a diode and of the product of the difference between this first value and a second value of the voltage across the terminals of the diode by a predetermined coefficient, comprises substantially identical bipolar transistors (1, 2), connected as diodes, in series with current sources (3, 4) for generating voltages representative of these first and second values, a capacitive calculating circuit (5-8) which produces a signal representative of the algebraic value of the difference between the input voltage and the reference level and an amplifier (9) for bringing this signal to a logic level.

REFERENCES:
patent: 3676702 (1972-07-01), McGrogan, Jr.
patent: 4028558 (1977-06-01), Heller et al.
patent: 4191900 (1980-03-01), Redfern et al.

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