Electronic monitoring system including contactless motion detect

Details Electronic monitoring system including contactless motion detect Electronic monitoring system including contactless motion detect

1974-06-12

1976-01-13

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

307252A, 307252P, 317DIG2, 323 1, 323 22Z, 328 5, 340258B, H01H 3600

Patent

active

039328031

ABSTRACT:
A contactless motion detector, including an oscillator and an amplifier, has an energizing circuit connected across an electronic breakdown device lying in series with a contant-current unit, this series combination receiving pulsating direct current from a supply circuit in parallel with an output thyristor which bridges either the entire series combination or only the constant-current unit. The output thyristor is controlled by a switching transistor responding to an output signal from the motion detector; even when the output thyristor fires to actuate a load in the supply circuit, a sufficient voltage drop is maintained across the breakdown device to keep the oscillator and the amplifier operating.

REFERENCES:
patent: 3114872 (1963-12-01), Allard
patent: 3303413 (1967-02-01), Warner et al.
patent: 3508084 (1970-04-01), Warner
patent: 3747012 (1973-07-01), Buck
patent: 3777251 (1973-12-01), Cecil et al.

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