Electronic monitoring system stabilized against accidental trigg

Details Electronic monitoring system stabilized against accidental trigg Electronic monitoring system stabilized against accidental trigg

1981-02-06

1982-06-22

Shoop, William M.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323316, 328 5, 307308, H01H 3600

Patent

active

043364918

ABSTRACT:
A contactless motion detector, including an oscillator sensitive to an approaching metallic element, includes an electronic switch such as a thyristor triggerable by an output signal from a demodulator comprising a storage capacitor which is alternately chargeable and dischargeable, preferably with constant current, during each cycle of a high-frequency voltage generated by the oscillator. The oscillator voltage is compared with a reference voltage by means of a differential amplifier causing the flow of a charging current into the capacitor when the oscillator voltage exceeds the reference voltage whereas a discharging current flows out of that capacitor in the opposite case. The reference voltage is so chosen that the capacitor charge rises in the course of a few cycles above a predetermined threshold when the oscillator voltage is high but remains below that threshold when it is low.

REFERENCES:
patent: 3621373 (1971-11-01), Mitchell et al.
patent: 3909625 (1975-09-01), Colglazier et al.
patent: 3979610 (1976-09-01), Gordon
patent: 3984757 (1976-10-01), Gott et al.
patent: 4138709 (1979-02-01), Colwill

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