Bridge-balance detection circuit

Details Bridge-balance detection circuit Bridge-balance detection circuit

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

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