Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1985-03-04
1987-04-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
361 93, 323278, H02H 902
Patent
active
046601210
ABSTRACT:
An intrinsically safe safety barrier includes an outgoing line, a return line, two switching transistors connected in the outgoing line, at least two control transistors having base-emitter circuits for controlling the switching transistors in order to regulate current when current increases in the outgoing line, and a single sensing resistor connected in the outgoing line in the base-emitter circuits of each of the control transistors.
REFERENCES:
patent: 3711763 (1977-01-01), Peterson
patent: 3796943 (1974-03-01), Nelson et al.
patent: 3906310 (1975-09-01), Esashika
patent: 4530023 (1985-07-01), Brown
Kapfer Karl
Schwarz Gerhad
Brown Boveri & Cie AG
DeBuer T.
Greenberg Laurence A.
Lerner Herbert L.
Pellinen A. D.
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