Electricity: power supply or regulation systems – Remote sensing
Patent
1977-03-29
1978-08-29
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
307252J, 323 25, 340562, 361 19, G05F 156, H01H 3600
Patent
active
041106784
ABSTRACT:
A contactless motion detector, such as an oscillator sensitive to an approaching metallic element, is connected across a storage capacitor charged from a source of pulsating direct current through a current-limiting device and shunted by a Zener diode. Connected across the series combination of storage capacitor and current-limiting device is an ancillary thyristor, triggerable by the detector, forming part of a firing circuit for a main thyristor in parallel therewith; that firing circuit further includes another Zener diode and a stabilizing resistor in series with the ancillary thyristor. Conduction of the main thyristor, upon the triggering of the ancillary thyristor, reduces to near-zero the resistance in series with a load, such as a relay, which is traversed by the current drawn from the source. With both thyristors cut off between pulsations of the source current, the storage capacitor is briefly recharged through a decoupling diode upon a retriggering of the ancillary thyristor before the firing of the main thyristor.
REFERENCES:
patent: 3679961 (1972-07-01), Hamilton
patent: 3932803 (1976-01-01), Buck
Goldberg Gerald
Ross Karl F.
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