Discriminator device

Details Discriminator device Discriminator device

1993-02-09

1994-08-09

Callahan, Timothy P.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307350, 3072723, H03K 5153

Patent

active

053369475

ABSTRACT:
A discriminator device for discriminating between two types of signal applied to an input port (EN), the first type being a binary logic signal having high and low values, and the second type of signal being a continuously variable signal or a floating voltage, the device including a voltage divider network (R1,R2) for coupling to the input port and a voltage supply (VCC) in order to provide a format signal, a second voltage divider network (R3,R4,R5) providing first and second voltage reference signals (VR1,VR2) having values intermediate the high and low values of the binary logic signal, comparators (34A, 34B) coupled to receive the format signal and the voltage reference signals, the outputs of the comparators being coupled to an output logic circuit (36-39) which provides a logic output signal of a value depending on the type of signal present at the input port.

REFERENCES:
patent: 3683284 (1972-08-01), Mueller
patent: 3787735 (1974-01-01), DeWitte et al.
patent: 4023046 (1977-05-01), Renirie
patent: 4571547 (1986-02-01), Day
patent: 4581544 (1986-04-01), Feldman
patent: 4945261 (1990-07-01), Wright

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