Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1974-09-03
1976-03-16
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307251, 250381, 340237R, 323 75A, H03K 1700
Patent
active
039448592
ABSTRACT:
A high input impedance circuit is employed to sense the condition of a bridge such as a Wheatstone bridge containing ionization chambers for smoke detection. The circuit comprises two CMOS inverters connected to operate as a differential signal detector, one inverter connected at its gate electrodes to one output terminal of the bridge and the other similarly connected to the other output terminal of the bridge. The system includes a simple null and sensitivity adjustment.
REFERENCES:
patent: 3063010 (1972-11-01), Richardson
patent: 3676680 (1972-07-01), Scheidweiler et al.
patent: 3775616 (1973-11-01), Tagashira et al.
patent: 3860919 (1975-01-01), Aker
Christoffersen Harold
Cohen Samuel
Davis B. P.
Miller, Jr. Stanley D.
RCA Corporation
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