Electricity: power supply or regulation systems – Remote sensing
Patent
1977-04-14
1978-09-26
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
307252J, 340562, 361 19, G05F 156
Patent
active
041173937
ABSTRACT:
A contactless motion detector, such as an oscillator sensitive to an approaching metallic element, is connected across a storage capacitor which can be charged from a source of pulsating direct current through a constant-current unit with two parallel branches, one of them including a voltage divider controlling an emitter-follower transistor in the other branch. A Zener diode, shunting the storage capacitor and part of the constant-current unit in series therewith, throttles the flow of charging current through that unit by stabilizing the base voltage of the emitter-follower transistor when the capacitor reaches a predetermined charging voltage. Connected across the series combination of storage capacitor and constant-current unit is an ancillary thyristor 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. The ancillary thyristor is triggerable by the detector via a pilot transistor and a protective complementary transistor in cascade with the emitter-follower transistor of the constant-current unit. 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: 3428897 (1969-02-01), Rew et al.
patent: 3679961 (1972-07-01), Hamilton
patent: 3932803 (1976-01-01), Buck
patent: 3988661 (1976-10-01), McCoy
Goldberg Gerald
Ross Karl F.
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