Intrinsically safe logic and-circuit having two inputs

Details Intrinsically safe logic and-circuit having two inputs Intrinsically safe logic and-circuit having two inputs

1993-06-29

1994-10-18

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307454, H03K 1920, H03K 19007

Patent

active

053571517

ABSTRACT:
A logic AND circuit comprises, in a cascade arrangement, a threshold oscillator having a power supply input connected to a first circuit input and a clamping amplifier providing an output signal only when simultaneously the voltage on a second circuit input exceeds a threshold and the threshold oscillator delivers an output signal. The oscillator comprises a single transistor whose emitter and collector circuits contain two primary windings of a transformer whose secondary winding constitutes a tuned circuit in association with a four-lead capacitor and whose base is biased from the first input via a filter cell having a parallel-connected four-lead capacitor. The clamping amplifier includes a single transistor connected to the second input via a filter cell having a parallel-connected four-lead capacitor, with one of its emitter and collector circuits containing the primary winding of another transformer whose secondary winding contains a resonant circuit with a parallel-connected four-lead capacitor from whose terminals an alternating output signal is taken.

REFERENCES:
patent: 4723082 (1988-02-01), Asano et al.
patent: 4972517 (1990-11-01), Kondou et al.
patent: 5153466 (1992-10-01), Stein et al.
Electronique, "Designasafe Logic AND Gate", pp. 63-64 and 67-68, Nov. 12, 1991, Sardat.

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