Comparator circuit with variable hysteresis characteristic

Details Comparator circuit with variable hysteresis characteristic Comparator circuit with variable hysteresis characteristic

1990-12-28

1992-11-24

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307352, 307354, 307359, 307364, 307491, 307494, 307552, H03K 5153, H03K 5159, H03K 522, H03K 508

Patent

active

051665506

ABSTRACT:
A comparator circuit including a reference-voltage generating unit for generating a variable reference voltage, and a comparator having a first input terminal to which an input signal is supplied and a second input terminal to which the variable reference voltage from the reference-voltage generating unit is supplied. The comparator circuit also includes additional-voltage generating unit for generating an additional voltage that varies in proportion to the variable reference voltage, and a switching unit that is connected to the additional-voltage generating unit and activated or deactivated in response to an output of the comparator. When the switching unit is deactivated, the input signal is supplied to the first input terminal of the comparator and the variable reference voltage from the reference-voltage generating unit is supplied to the second input terminal of the comparator. When the switching unit is activated, the additional voltage from the additional-voltage generating unit is added to the input signal, and the sum of the input signal and the additional voltage is supplied to the first input terminal of the comparator so that an interpretation processing of the comparator is performed with a variable hysteresis characteristic corresponding to the additional voltage that varies in proportion to the variable reference voltage.

REFERENCES:
patent: 4068138 (1978-01-01), Miyakawa et al.
patent: 4072870 (1978-02-01), Davis

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