Input converter

Details Input converter Input converter

1976-07-22

1977-12-13

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307229, 250551, H03K 326

Patent

active

040631214

ABSTRACT:
An input converter circuit for producing a logic level indication of the on or off condition of an input. The input may be AC or DC at any reasonable level. A bilateral photocoupler output is applied to an operational amplifier integrator, which establishes the integration time of the signal. The amplifier output is coupled to a Schmitt trigger having threshold levels at about one third and two thirds of the power supply voltage. The output of the Schmitt trigger provides a logic one output if there is an input signal present and a logic zero output otherwise.

REFERENCES:
patent: 3752980 (1973-08-01), Dixon et al.
patent: 3795821 (1974-03-01), Ichiyanagi
patent: 3801837 (1974-04-01), Pease
patent: 3842259 (1974-10-01), Bruning

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