Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1983-04-21
1985-11-05
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
328 5, 340561, H03K 326
Patent
active
045516375
ABSTRACT:
A contactless motion detector is energized in series with a load from a source of direct current via a pair of supply leads connected across a binary switching circuit in parallel with a voltage-generating network designed to deliver operating current to the detector in either switching position. The switching circuit comprises a main electronic switch, designed as a transistor, which is turned on or off by an output signal of the detector and in turn controls an ancillary electronic switch (transistor or thyristor) whose conduction intensifies the load current. When both electronic switches are transistors, they are interconnected in a positive-feedback loop driving them into conduction as soon as the main transistor is turned on; the base current of the ancillary transistor then contributes significantly to the load current while its collector current helps maintain the energization of the detector. The voltage-generating network includes a current limiter as well as a constant-voltage generator, e.g. a Zener diode.
REFERENCES:
patent: 3719836 (1973-03-01), Possell
patent: 3935542 (1976-01-01), Buck
patent: 4135124 (1979-01-01), Buck
patent: 4193023 (1980-03-01), Buck et al.
Buck Robert
Lamarche Jean L.
Davis B. P.
Dubno Herbert
IFM Electronic GmbH
Miller Stanley D.
Ross Karl F.
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