Apparatus for digitally monitoring an analog parameter of an ind

Details Apparatus for digitally monitoring an analog parameter of an ind Apparatus for digitally monitoring an analog parameter of an ind

1976-05-25

1977-05-17

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307271, 321 6, 328 1, 328150, 331 65, 331107R, 340347AD, H03K 326, H03K 116

Patent

active

040244199

ABSTRACT:
An operating parameter such as temperature or pressure is digitally quantized into a plurality of constant-duration first pulses of corresponding amplitude. The first pulses are employed, over the duration of the first pulses, to continually charge a capacitor, which in turn is coupled across an oscillatory discharge path including a diac or other threshold-operated, negative resistance electronic element. The diac is triggered on when the voltage across the capacitor exceeds a predetermined value, and is triggered off again when the voltage thereacross during discharge corresponds to a second predetermined diminished value across the capacitor, thereby effecting the capacitor discharge as a series of constant amplitude relatively short duration pulses whose number is proportional to the amplitude of the first pulse. Advantageously, the second pulses are coupled via a pulse transformer to a full-wave rectifier, and are then routed to a suitable processor for further utilization.

REFERENCES:
patent: 3725789 (1973-04-01), Mager
patent: 3731201 (1973-05-01), Frisbie

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