Detector device for converting A.C. inputs to an D.C. output and

Details Detector device for converting A.C. inputs to an D.C. output and Detector device for converting A.C. inputs to an D.C. output and

1976-02-17

1977-05-03

Caldwell, John W.

Communications: electrical

Systems

Call station

307235F, 307355, 328148, 340 41R, G08B 2100

Patent

active

040217930

ABSTRACT:
An input detection circuit to provide a D.C. output signal of a selected value upon receipt of an input A.C. signal of a given value on an input line. The detector circuit includes a NORTON type current responsive operational amplifier having an inverted input terminal, a non-inverted input terminal and an output terminal. A circuit is provided at the inverted terminal for biasing the amplifier to provide an output voltage on the output terminal substantially less than the selected output signal. A full wave rectifier connected to the input line and having a first output conductive during the negative portion of an A.C. signal applied to the input line and a second output conductive during the positive portion of an A.C. signal applied to the input line. There is provided a first resistor for connecting the first output of the rectifier to the inverted terminal and a second resistor for connecting the second output to the non-inverted terminal. In addition, there is a system for detecting the existence of concurrent A.C. inputs from at least one of each of two groups of A.C. inputs using the detector device as described above to produce input signals to an AND gate means. The output of this AND gate means can be used to energize devices responsive to the condition indicated.

REFERENCES:
patent: 3459963 (1969-08-01), Saari
patent: 3482231 (1969-12-01), Florek et al.
patent: 3548324 (1970-12-01), Henderson
patent: 3588857 (1971-06-01), Gessner
patent: 3641546 (1972-02-01), Blackburn
patent: 3708791 (1973-01-01), Curran et al.
patent: 3808534 (1974-04-01), Summers et al.
patent: 3813665 (1974-05-01), Parfomak et al.
patent: 3813666 (1974-05-01), Gately
patent: 3836790 (1974-09-01), Becker
patent: 3872388 (1975-03-01), James

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